JP2007232185A - Automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic transmission for actualizing efficient cooling of an ECU with the flow of oil while eliminating the need for a dedicated cover for an OCV connecting wire and eliminating the need for an ECU dedicated connector and an ECU dedicated fixture. <P>SOLUTION: The connector terminal of an electromagnetic actuator 12 is directly connected to a film substrate 36 which is adhered to a filter element 33 supported between a hydraulic control body and a strainer cover 32. This eliminates the need for "the wire dedicated cover". Since the film substrate 36 on which the ECU 25 is mounted is adhered to the filter element 33, the ECU 25 can be efficiently cooled with the flow of oil sucked by an oil pump. The ECU 25 is directly mounted on the film substrate 36 and directly connected to an ECU terminal 25a and an ECU wire 37, therefore eliminating the need for "the ECU dedicated connector". The film substrate 36 on which the ECU 25 is mounted is supported together with the filter element 33, therefore eliminating the need for "the ECU dedicated fixture". <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automatic transmission for a vehicle, and in particular, a technology for connecting an oil flow control valve (hereinafter referred to as OCV) mounted in a hydraulic control device, and an ECU (an abbreviation for an electronic control unit: electric control unit). Connection technology, and further, heat dissipation technology of ECU.

(First prior art)
An automatic transmission for a vehicle is equipped with a hydraulic control device for engaging / disengaging an engagement device (multi-plate clutch, multi-plate brake, etc.).
The hydraulic control device is equipped with a plurality of OCVs for precisely controlling the hydraulic pressure. The OCV includes a valve (spool valve, ball valve) and an electromagnetic actuator (an example of an electric actuator) that drives the valve, and the electromagnetic actuator includes a connector for energizing the solenoid.

A connector provided in each electromagnetic actuator is connected to an external connector for connecting external equipment. This external connector is attached to the end of a flexible film-like wiring. For this reason, the film-like wiring connected to the OCV (hereinafter referred to as the OCV connecting wiring) may be moved by the flow of oil flowing through the oil pan, or may be damaged due to interference with other members during assembly. . For this reason, in the conventional technique, the OCV connection wiring is held by a dedicated cover.
However, since a dedicated cover only for protecting the OCV connection wiring is required, the number of parts and the number of assembling steps are increased, which causes an increase in cost.

(Second prior art)
The automatic transmission is equipped with an ECU for controlling electric functional parts mounted on the automatic transmission. Since this ECU generates heat when activated, a technique of cooling with oil in an oil pan has been proposed.
However, since the flow of the entire oil in the oil pan is gentle, the ECU cannot be efficiently cooled by the oil flow simply by disposing the ECU in the oil pan.

(Third prior art)
The ECU mounted on the automatic transmission is electrically connected to external equipment using an ECU dedicated connector.
However, the ECU-dedicated connector is expensive and has a large physique and is difficult to mount in a narrow automatic transmission. Therefore, a connection means for an ECU with a small mounting space is desired.
In addition, although a technology for mounting the ECU on the film substrate has been proposed by eliminating the ECU dedicated connector, an ECU dedicated fixing tool for fixing the film substrate on which the ECU is mounted is required, which saves space and costs. It was difficult to convert.
JP 2004-52820 A JP 2005-186070 A

  The present invention has been made in view of the above problems, and its purpose is (1) no dedicated cover for the OCV connection wiring connected to the OCV is required, and (2) the ECU can be efficiently flowed with oil. (3) To provide an automatic transmission that can be cooled and does not require an ECU-dedicated connector and an ECU-dedicated fixing tool.

[Means of claim 1]
(1) The automatic transmission according to claim 1, wherein the film substrate provided with the actuator wiring directly electrically connected to the terminal of the electric actuator is supported by being sandwiched between the hydraulic control body and the strainer cover. It is affixed to the element.
In this way, since the film substrate connected to the terminal of the electric actuator is supported by being sandwiched between the hydraulic control body and the strainer cover together with the filter element, the “dedicated cover for OCV connection wiring” used in the prior art is used. "Is unnecessary, the number of parts and assembly man-hours can be reduced, and the manufacturing cost can be reduced.

(2) In the automatic transmission according to claim 1, the ECU is mounted on a film substrate, and the film substrate is attached to a filtration element supported by being sandwiched between a hydraulic control body and a strainer cover. It is a thing. Here, in the strainer cover, the oil sucked by the oil pump flows inside, and the flow rate of the oil is faster than in the oil pan.
For this reason, the ECU can be efficiently cooled by the flow of oil, and the reliability of the ECU can be improved.

(3) In the automatic transmission according to the first aspect, the ECU is mounted on the film substrate. Since this film substrate is provided with an ECU wiring for making an electrical connection directly to a terminal of the ECU, the “ECU-dedicated connector” used in the prior art becomes unnecessary.
Further, as described above, the film substrate on which the ECU is mounted is attached to a filtration element that is sandwiched and supported between the hydraulic control body and the strainer cover. That is, the film substrate on which the ECU is mounted is supported by being sandwiched between the hydraulic control body and the strainer cover together with the filter element. For this reason, the “ECU fixing tool” used in the prior art becomes unnecessary.
As described above, since the “ECU-dedicated connector” and the “ECU-dedicated fixture” are not used, the cost can be reduced and the ECU can be mounted by the film substrate, so that the mounting space for the ECU can be reduced. it can.

The automatic transmission of the best mode 1 is mounted on a hydraulic control body disposed in an oil pan of an automatic transmission for a vehicle, and an electric OCV that controls output hydraulic pressure or oil discharge amount by energization, and automatic transmission An ECU that controls energization of electrical functional parts mounted on the machine and a filter element that filters oil sucked into an oil pump mounted on the automatic transmission.
This automatic transmission includes a strainer cover that is attached to a hydraulic control body and through which oil sucked by an oil pump flows.
The filter element is supported by being sandwiched between a hydraulic control body and a strainer cover by attaching a flexible film substrate.
An ECU is mounted on the film substrate, and an ECU wiring for making an electrical connection directly to a terminal of the ECU and an actuator wiring for making an electrical connection directly to a terminal of an electric actuator of the OCV are provided. .

A first embodiment to which the present invention is applied will be described with reference to FIGS.
[Configuration of hydraulic control unit]
First, the basic configuration of the hydraulic control device will be described.
An automatic transmission that varies the output rotation ratio of a vehicle traveling engine includes a fluid coupling (such as a torque converter), a plurality of gear trains (such as a plurality of planetary gear devices), and an engagement device that switches between the plurality of gear trains. A hydraulic control device for controlling engagement / disengagement (multi-plate clutch, multi-plate brake, etc.) is provided.

The hydraulic control device is disposed in an oil pan (not shown) below a plurality of gear trains (showing a rotating body 1 such as a clutch in FIG. 1). The hydraulic control device includes a hydraulic control body in which a hydraulic circuit is formed. The hydraulic control body of this embodiment has a two-stage configuration of an upper body 2 and a lower body 3, and is coupled via an oil passage provided in a separate plate 4 sandwiched between the upper body 2 and the lower body 3. ing.
The lower body 3 of this embodiment is provided with a plurality (four in FIG. 1) of OCVs 5 for switching the hydraulic pressure to engage / disengage the engagement device.

The OCV 5 is, for example, shown in FIG. 2, and is formed by combining a valve 11 that switches the hydraulic pressure or adjusts the hydraulic pressure and an electromagnetic actuator 12 (an example of an electric actuator) that drives the valve 11. Here, FIG. 2A shows an example in which a spool valve is used as the valve 11, and FIG. 2B shows an example in which a ball valve is used as the valve 11.
In FIG. 2A, the degree of communication between the input port 14 and the output port 15 is minimized (closed) by the action of the return spring 13 when the electromagnetic actuator 12 is OFF, and the output port 15 and the discharge port 16 are disconnected. FIG. 2B shows an N / C (normally closed) type electromagnetic hydraulic control valve that maximizes the degree of communication. FIG. 2B shows the input port 14 and the output port due to the action of the return spring 13 when the electromagnetic actuator 12 is OFF. 15 shows N / O (normally open) type electromagnetic hydraulic control valves in which the degree of communication of 15 is maximized and the degree of communication of the output port 15 and the discharge port 16 is minimized (closed). N / O and N / C may be reversed, respectively.

The valve 11 is inserted into the lower body 3 and is formed by combining a valve housing 17 and a valve body 18.
The valve 11 includes an input port 14 that receives supply of oil from an oil pump, an output port 15 that generates output hydraulic pressure in an engagement device and the like, and a discharge port 16 that opens into the lower body 3 and discharges oil that has passed through the inside. Prepare.
The valve body 18 moves in the valve housing 17 and adjusts the communication degree of the input port 14, the output port 15, and the discharge port 16 to control the hydraulic pressure (or discharge amount) of the output port 15.

On the other hand, some valves 11 of the OCV 5 include a valve breathing port 19 as shown in FIG. The valve breathing port 19 is a passage that communicates the space whose volume changes with the movement of the valve body 18 with the outside.
The exhaust port 16 and the valve breathing port 19 described above communicate with the low pressure side.
Here, the lower body 3 is provided with an OCV cover 20 that divides an exposed portion of the OCV 5 (a portion exposed to the outside of the lower body 3) from the outside. The exhaust port 16 and the valve breathing port 19 are provided with the OCV cover 20. It opens into the OCV cover 20 directly inside (on the clean side described later) or through an oil passage provided in the lower body 3 into which the valve 11 is inserted.

The electromagnetic actuator 12 is fixedly disposed in the OCV cover 20 and is formed by combining a solenoid 21 and a moving core 22.
The solenoid 21 includes a coil that generates a magnetic force when energized. The solenoid 21 generates a magnetic force corresponding to the amount of energization given through a connector terminal 23a provided on the connector 23, thereby magnetizing the moving core 22 in the axial direction. Suction.
Here, the connector 23 is an insulating resin member having a block shape extending in a direction orthogonal to the axial direction of the electromagnetic actuator 12, and the connector terminal 23 a is exposed on the end face in the orthogonal direction.

The moving core 22 is driven in the axial direction by the magnetic attractive force of the solenoid 21, and moves the valve body 18 in the axial direction via the shaft 24.
The solenoid 21 is energized and controlled according to the driving state of the vehicle by the automatic transmission ECU 25 shown in FIG. 1, thereby controlling the axial positions of the moving core 22 and the valve body 18. As a result, the ratio between the degree of communication between the input port 14 and the output port 15 and the ratio between the degree of communication between the output port 15 and the discharge port 16 is variably controlled. As a result, the output pressure of oil generated at the output port 15 is controlled. .

  On the other hand, as shown in FIGS. 2 (a) and 2 (b), the OCV5 electromagnetic actuator 12 includes an actuator breathing port 26 that communicates the inside and the outside. The actuator breathing port 26 is a passage that communicates the space whose volume changes with the movement of the moving core 22 with the outside, and opens directly into the OCV cover 20.

[Features of Example 1]
Next, features of the first embodiment will be described.
The automatic transmission is equipped with an oil pump (not shown) serving as a hydraulic pressure source, and performs an oil suction operation and a discharge operation by rotation received from the engine. Further, the automatic transmission is equipped with an oil filtration suction device (oil strainer) that filters oil sucked by an oil pump (not shown).
The oil filtration suction device of this embodiment includes an OCV cover 20 that houses a plurality of OCVs 5, a strainer cover 32 that is attached to the lower part of the lower body 3 and has an oil suction port 31 formed in the lower part, and an OCV from within the strainer cover 32. A filter element (filter medium) 33 that filters oil flowing into the cover 20 (a space in which the OCV 5 is disposed) and a strainer plate 34 sandwiched between the lower body 3 and the strainer cover 32 are configured.

The inside of the OCV cover 20 is connected to the oil suction side of the oil pump, and when the oil pump is activated, the inside of the OCV cover 20 becomes negative pressure.
The filter element 33 is provided in a shape that covers substantially the entire lower surface of the strainer plate 34 (the surface on the strainer cover 32 side), and is supported by being sandwiched between the strainer cover 32 and the strainer plate 34.

The strainer plate 34 is a partition wall that partitions the inside of the lower body 3 and the inside of the strainer cover 32. As shown in FIG. 2C, the strainer plate 34 is formed with a large opening 35 that allows the inside of the lower body 3 and the inside of the strainer cover 32 to communicate with each other. In addition, a net-like net 35a having a rough mesh is provided in the opening 35, and the filtering element 33 is prevented from being sucked into the lower body 3 and bent.
The strainer cover 32 forms an oil passage for oil flowing from the oil suction port 31 to the opening 35 between the strainer cover 34 and the strainer plate 34. The strainer cover 32 supports the filter element 33 with the strainer plate 34 interposed therebetween. The reference numeral 32 a formed on the strainer cover 32 is a support column that supports the intermediate portion of the filtration element 33 by pressing it against the strainer plate 34.

  During operation of the engine, the oil pump sucks oil in the OCV cover 20, so that the oil passes through the oil pan → the oil suction port 31 → the strainer cover 32 → the filtration element 33 → the OCV cover 20 to the oil pump. Inhaled. For this reason, all the oil that flows into the OCV cover 20 from the opening 35 passes through the filter element 33. Thereby, the inside of the OCV cover 20 becomes a clean side where the oil that has passed through the filtration element 33 exists, and the inside of the oil pan and the strainer cover 32 become a dardy side where the oil before passing through the filtration element 33 exists.

A film substrate (FPC) 36 is attached to the upper surface of the filter element 33 (the surface on the strainer plate 34 side).
The film substrate 36 is a flexible resin film on which energization wiring (ECU wiring 37 and actuator wiring 38) is printed and the ECU 25 is mounted. Note that the energization wiring (ECU wiring 37, actuator wiring 38) and the ECU 25 may be provided on the upper surface of the flexible resin film or on the lower surface of the flexible resin film. It may be sandwiched between flexible resin films.

The ECU 25 is directly mounted on the film substrate 36. The ECU wiring 37 provided on the film substrate 36 and the ECU terminal 25a for external connection provided on the ECU 25 are directly electrically connected by a welding technique such as laser or a joining technique such as soldering. .
On the other hand, the connector 23 of each electromagnetic actuator 12 is inserted into the connector insertion port 39 formed in the strainer plate 34 and exposed to the lower surface of the strainer plate 34. The connector terminal 23a exposed to the lower surface of the connector 23 is The actuator wiring 38 provided on the film substrate 36 is directly electrically connected by a welding technique such as laser or a joining technique such as soldering.
Note that the ends of the ECU wiring 37 and the actuator wiring 38 are electrically connected to external equipment via an external connector (not shown) connected to the end of the film substrate 36.

(First Effect of Example 1)
In the automatic transmission according to the first embodiment, as described above, the film substrate 36 provided with the actuator wiring 38 that is directly electrically connected to the connector terminal 23a of the electromagnetic actuator 12 has the hydraulic control body (specifically, the lower body). 3 is attached to a filtration element 33 that is sandwiched and supported between a strainer plate 34) attached to the lower surface of 3 and a strainer cover 32.
In this way, the film substrate 36 connected to the connector terminal 23a of the electromagnetic actuator 12 is supported by being sandwiched between the hydraulic control body and the strainer cover 32 together with the filter element 33. The dedicated cover for OCV connection wiring is not required, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced.

(Second effect of Example 1)
In the automatic transmission according to the first embodiment, as described above, the ECU 25 is directly mounted on the film substrate 36, and the film substrate 36 is sandwiched and supported between the hydraulic control body and the strainer cover 32. It is affixed to the filter element 33. Here, in the strainer cover 32, the oil sucked by the oil pump flows inside, and the flow rate of the oil is faster than that in the oil pan.
For this reason, the ECU 25 can be efficiently cooled by the flow of oil sucked by the oil pump, and the reliability of the ECU 25 can be improved.

(Third effect of Example 1)
In the automatic transmission according to the first embodiment, the ECU 25 is mounted on the film substrate 36 as described above. The film substrate 36 includes an ECU wiring 37 that is directly connected to the ECU terminal 25a of the ECU 25, and the “ECU dedicated connector” used in the prior art is not necessary.
The film substrate 36 on which the ECU 25 is mounted is attached to the filtration element 33 that is sandwiched and supported between the hydraulic control body and the strainer cover 32 as described above. That is, the film substrate 36 on which the ECU 25 is mounted is supported by being sandwiched between the hydraulic control body and the strainer cover 32 together with the filter element 33. For this reason, the “ECU fixing tool” used in the prior art becomes unnecessary.
As described above, since the “ECU-dedicated connector” and the “ECU-dedicated fixture” are not used, the cost can be reduced and the ECU 25 can be mounted by the film substrate 36, so that the mounting space for the ECU 25 can be reduced. Can do.

[Modification]
In the above embodiment, the electromagnetic actuator 12 is used as an example of the electric actuator. However, other electric actuators such as an electric motor and a piezoelectric actuator may be used.

(A) Sectional drawing which looked at hydraulic control apparatus from axial direction of OCV, (b) Main part sectional view of hydraulic control apparatus, (c) Main part sectional view of hydraulic control apparatus. (A) It is sectional drawing of OCV using a spool valve, (b) It is sectional drawing of OCV using a ball valve.

Explanation of symbols

3 Lower body (hydraulic control body equipped with OCV)
5 OCV (oil flow control valve)
12 Electromagnetic actuator (electric actuator)
23a Connector terminal (electric actuator terminal)
25 ECU
25a ECU terminal (terminal of ECU)
32 Strainer cover 33 Filtration element 36 Film substrate 37 ECU wiring 38 Actuator wiring

Claims (1)

An electric oil flow control valve mounted on a hydraulic control body arranged in an oil pan of an automatic transmission for a vehicle, which controls output hydraulic pressure or oil discharge amount by energization;
An ECU for performing energization control of electrical functional parts mounted on the automatic transmission;
A filter element for filtering oil sucked into an oil pump mounted on the automatic transmission;
In an automatic transmission comprising:
The automatic transmission includes a strainer cover that is attached to the hydraulic control body and through which the oil sucked by the oil pump flows.
The filtration element has a flexible film substrate attached thereto, and is supported by being sandwiched between the hydraulic control body and the strainer cover,
On the film substrate, the ECU is mounted, and an ECU wiring for direct electrical connection to a terminal of the ECU and an actuator wiring for direct electrical connection to a terminal of an electric actuator of the oil flow control valve And an automatic transmission characterized in that.

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