JP4957207B2 - Forward / backward setting hydraulic switching device and automatic transmission - Google Patents

Description

  The present invention relates to a forward / reverse setting hydraulic pressure for switching and outputting the forward setting hydraulic pressure and the reverse setting hydraulic pressure to a power transmission mechanism that switches the output rotation between forward forward rotation and reverse rotation in accordance with the forward setting hydraulic pressure and the reverse setting hydraulic pressure. Regarding the switching device, for example, but not intended to be limited to this, the forward set hydraulic pressure and the reverse set hydraulic pressure used for setting the range (forward D, reverse R, neutral N) of the automatic transmission on the vehicle correspond to the range specification. Thus, it can be used for a range setting hydraulic pressure switching device that selectively outputs.

  One form of this type of range setting hydraulic pressure switching device is described in Patent Document 1, and the other form is described in Patent Document 2.

JP-A-5-209683 JP 2005-24060 A

  In the range setting hydraulic pressure switching device shown in FIG. 1 of Patent Document 1, a spool (valve element) is moved by a change in control pressure caused by opening / closing of two solenoid valves S3, S4 and solenoid valve S3 for range switching. The first switching valve 200 that switches the port that outputs the pressure, the second switching valve 300 that receives the output hydraulic pressure and changes the control pressure due to the opening and closing of the solenoid valve S4 to switch the hydraulic output port by moving the spool, and the output hydraulic pressure A reverse gear control valve 400 is provided that operates in response.

  The range setting hydraulic pressure switching device described in FIG. 3 of Patent Document 2 is driven by a forward range setting solenoid valve SD and its output hydraulic pressure in order to prevent a range setting error when the solenoid valve S4 fails. A forward hydraulic valve 102 that outputs forward hydraulic pressure, a reverse range setting solenoid valve SR, and a reverse hydraulic valve 100 that is driven by the output hydraulic pressure and outputs reverse hydraulic pressure are provided. The output hydraulic pressure for setting the forward range is applied to the reverse hydraulic output shut-off port for the reverse hydraulic valve 102, so that when the forward range is set, the reverse hydraulic valve 102 is automatically and compulsorily shut off. And Further, the output hydraulic pressure for setting the reverse range of the solenoid valve SR is applied to the forward hydraulic output shut-off port of the forward hydraulic valve 100, so that the forward hydraulic valve 102 is automatically and forcibly set when the reverse range is set. Set the hydraulic output for forward shut off.

  The present invention enhances the function of preventing a forward / reverse hydraulic pressure output caused by a malfunction or failure of a forward / reverse hydraulic valve in which the output / shutoff of the forward / backward hydraulic pressure is controlled by the output of a solenoid valve for setting the forward / reverse travel For the purpose.

(1) The forward setting solenoid valve (SD) and the forward hydraulic valve (Dva) driven by the output hydraulic pressure to output the forward hydraulic pressure, and the reverse setting solenoid valve (SR) and the output hydraulic pressure In a forward / reverse setting hydraulic pressure switching device equipped with a reverse hydraulic valve (Rva) that is driven to output reverse hydraulic pressure,
The forward setting solenoid valve (SD) has an input pressure port (Pi) and an output pressure port (Po), and is a valve that opens and closes between these ports by energization / non-energization of the solenoid, The forward hydraulic valve (Dva) includes an input pressure port (Pi) and a control pressure port (Pc) that communicate with the output pressure port (Po) of the forward setting solenoid valve (SD), and an output pressure port ( has Po), Ri valve der outputting the forward hydraulic to the output pressure port (Po) by the hydraulic pressure of the corresponding control pressure port (Pc) when applied is forward hydraulic to the input pressure port (Pi) ,
The reverse hydraulic valve (Rva) has a cutoff pressure input port (Pb) communicating with the output pressure port (Po) of the forward setting solenoid valve (SD), and the reverse hydraulic valve (Dva) This is a valve that shuts off the flow between the input pressure port (Pi) and the output pressure port (Po) of the reverse hydraulic valve (Rva) when forward hydraulic pressure is applied to the input pressure port (Pi).
A forward / reverse setting hydraulic pressure switching device (50) characterized by that.

  In addition, in order to make an understanding easy, the code | symbol of the response | compatibility or the equivalent element of the Example shown in drawing and mentioned later in parentheses was added for reference as an example. The same applies to the following.

(2) the solenoid valve for forward set (SD) by energization of the solenoid, which is normally closed valve to flowing between the input pressure port and (Pi) and an output pressure port (Po), the (1) The forward / reverse setting hydraulic pressure switching device (50) described in 1.

(3) the solenoid valve for reverse setting (SR) by energization of the solenoid, which is normally closed valve to flowing between the input pressure port and (Pi) and an output pressure port (Po), the (1) The forward / reverse setting hydraulic pressure switching device (50) described in 1.

(4) the solenoid valve for reverse setting (SR) by energization of the solenoid, a normally open valve that blocks flowing between the input pressure port and (Pi) and an output pressure port (Po), the (1 ) The forward / reverse setting hydraulic pressure switching device (50).

( 5 ) The speed change mechanism (10), the hydraulic circuit (20) for driving the speed change mechanism, the solenoid valve group (30) for controlling the flow of hydraulic pressure in the hydraulic circuit, and the above (1) to (4) Including the forward / reverse setting hydraulic pressure switching device according to any one of the above, wherein the forward hydraulic valve (Dva) and the backward hydraulic valve (Rva) of the forward / backward hydraulic pressure switching device are in the hydraulic circuit, The automatic transmission (100), wherein a solenoid valve (SD) for setting and a solenoid valve (SR) for reverse setting are in the solenoid valve group.

  According to (1) above, when the forward setting solenoid valve (SD) is set to forward hydraulic pressure non-output (shut off: valve closed), the forward hydraulic valve (Dva) ), But the forward pressure valve (Dva) input pressure port (Pi) is blocked by the forward setting solenoid valve (SD). Since the hydraulic pressure for outputting the forward hydraulic pressure is not applied, the forward hydraulic valve (Dva) does not output the forward hydraulic pressure. That is, it is fail-safe.

When the forward setting solenoid valve (SD) is set to forward hydraulic pressure output and the forward hydraulic valve (Dva) outputs forward hydraulic pressure, the forward setting solenoid valve (SD) outputs from the output port (Po). The hydraulic pressure applied to the input pressure port (Pi) of the hydraulic pressure valve (Dva) is added to the shutoff pressure input port (Pb) of the reverse hydraulic valve (Rva), which causes the reverse hydraulic valve (Rva) to enter its input pressure port. Block the flow between (Pi) and the output pressure port (Po). Therefore, the reverse hydraulic valve (Rva) is restrained so as not to output the reverse hydraulic pressure.

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[Example 1]
FIG. 1 shows an outline of an automatic transmission according to an embodiment of the present invention. The automatic transmission 100 includes a transmission mechanism 10, a hydraulic circuit 20 that drives the transmission mechanism 10, and a solenoid valve group 30 that controls the flow of hydraulic pressure in the hydraulic circuit 20. The speed change mechanism 10 changes the rotational power of the prime mover (engine and / or electric motor) to the rotational power for driving the wheel drive shaft and changes the direction thereof, and performs a torque converter and a multi-stage speed change. Including planetary gear mechanism, clutch and brake for The hydraulic circuit 20 includes an oil pump, many mechanical valves, an orifice, and a fluid flow path. When each solenoid valve of the solenoid valve group 30 inserted in the fluid flow path is turned on (opened) / off (closed) or hydraulically switched, the hydraulic circuit 20 turns on (applies hydraulic pressure to the clutch and brake of the transmission mechanism 10. ) / Off (release). As a result, the range (parking P, reverse R, neutral N, forward D, S, L) of the automatic transmission 100 is determined, and forward and reverse speed stages (first speed to sixth speed) are determined. In the solenoid valve group 30, SD is a forward setting solenoid valve, SR is a reverse setting solenoid valve, and SD and SR are range setting solenoid valves. The other valves SL1 to SL5 of the solenoid valve group 30 are for setting the speed stage and lockup.

  The electronic control unit ECU is supplied with status signals such as a brake signal, throttle opening signal, prime mover rotation speed signal, vehicle speed signal, and other status signals to be referred to for determining the range and speed stage, and range selection. A range instruction signal representing a key operated by the driver of the key group (electric switch group) 40 is given. The electronic control unit ECU determines a range to be set and a speed stage in response to the status signal and the range instruction signal, and sets a solenoid for setting the automatic transmission 100 to the determined range and speed stage. A solenoid driver (energization circuit) that generates a solenoid control signal that instructs on / off (non-energization) of each solenoid valve of the valve group 30 and energizes each solenoid in the block of the electronic control unit ECU. ). This energizes each solenoid valve or stops energization.

  The forward setting solenoid valve SD gives the original hydraulic pressure for forward hydraulic output to the forward hydraulic valve Dva for outputting the range setting hydraulic pressure of the hydraulic circuit 20. A reverse setting solenoid valve SR provides the original hydraulic pressure for the reverse hydraulic pressure output to the forward hydraulic valve Dva and the reverse hydraulic valve Rva. These forward setting solenoid valve SD, forward hydraulic valve Dva, reverse setting solenoid valve SR, and reverse hydraulic valve Rva are the first embodiment of the forward / reverse setting hydraulic pressure switching device of the present invention. This is the main element of the range setting oil pressure switching device 50.

  FIG. 2 shows a configuration of the range setting hydraulic pressure switching device 50. The pressure oil discharged from the oil pump 21 in the hydraulic circuit 20 shown in FIG. 1 is adjusted to a substantially constant pressure by the primary regulator valve 22 in the hydraulic circuit 20, and a pressure oil source is supplied to each part in the hydraulic circuit 20. (Line pressure). The line pressure is applied to the input pressure port Pi of the forward setting solenoid valve SD and the reverse setting solenoid valve SR of the range setting hydraulic pressure switching device 50.

  In this embodiment, the solenoid valve SD for forward setting is a plunger (or spool: valve body) that opens (flows) / closes (blocks) between the input pressure port Pi and the output pressure port Po. It is a normally open (N / O) on-off valve having a spring that forces the open (flow) position and a solenoid (electric coil) that drives the plunger to the closed (cut off) position when energized.

  In this embodiment, the reverse setting solenoid valve SR is a plunger that opens (flows) / closes (cuts off) between the input pressure port Pi and the output pressure port Po, and forces the plunger to a closed (cut off) position. A normally closed (N / C) on-off valve having a solenoid that drives the plunger to an open (flow) position when energized.

  The forward hydraulic valve Dva forcibly connects the output pressure port Po to the drain pressure port Ex from the input pressure port Pi and vice versa, and forces the spool to the connection position between the output pressure port Po and the drain pressure port Ex. A control pressure port Pc that is a hydraulic pressure input port for driving the spool to a connection position between the output pressure port Po and the input pressure port Pi, and between the output pressure port Po and the input pressure port Pi. Even if the connection hydraulic pressure is applied, it is provided with a cutoff pressure port Pb which is a hydraulic pressure input port for driving the spool to the connection position between the output pressure port Po / drain pressure port Ex in cooperation with the driving force of the spring.

  The structure and operation of the reverse hydraulic valve Rva are the same as the forward hydraulic valve Dva. As shown in FIG. 2, the input pressure port Pi and the control pressure port Pc of the forward hydraulic valve Dva communicate with the output port Po of the forward setting solenoid valve SD, and the shut-off pressure of the reverse hydraulic valve Rva. The port Pb communicates. Similarly, the input pressure port Pi and the control pressure port Pc of the reverse hydraulic valve Rva communicate with the output port Po of the reverse setting solenoid valve SR, and the shutoff pressure port Pb of the forward hydraulic valve Dva communicates with the output port Po. ing.

  In this embodiment, as shown in the table in FIG. 2, the electronic control unit ECU sends an on / off signal to the valves SD and SR in response to a switch operation on the range selection key group 40 by the driver, that is, a range instruction. The valve SD and SR are energized or de-energized. This will be specifically described below.

  When forward D (S and L are the same) is specified, the electronic control unit ECU does not energize the solenoid valve SD for forward setting (this opens SD), and also energizes the solenoid valve SR for backward setting. No (this closes SR). In this state, as shown in FIG. 2, the forward setting solenoid valve SD outputs the line pressure to the output pressure port Po, so that the forward hydraulic valve Dva applies the line pressure to the output port Po. Output as hydraulic pressure. That is, the forward hydraulic pressure is output to the forward setting hydraulic line PLd. The hydraulic pressure applied from the output port Po of the forward setting solenoid valve SD to the input pressure port Pi of the forward hydraulic valve Dva is applied to the shut-off pressure input port Pb of the reverse hydraulic valve Rva, whereby the reverse hydraulic valve Rva is The flow between the input pressure port Pi and the output pressure port Po is blocked. Accordingly, the reverse hydraulic valve Rva is constrained so as not to output the reverse hydraulic pressure to the reverse setting hydraulic line PLr.

  Even if the line pressure is output from the output pressure port Po of the reverse solenoid valve SR due to some failure, the hydraulic pressure applied by the forward solenoid valve SD and applied to the shutoff pressure port Pb of the reverse hydraulic valve Rva is low. Since the spool of the valve Rva is driven to the Po / Ex connection position in cooperation with the spring of the reverse hydraulic valve Rva, the reverse hydraulic pressure of the reverse hydraulic valve Rva disappears. That is, the reverse hydraulic pressure for the reverse setting hydraulic line PLr disappears.

  Further, when the forward setting solenoid valve SD is set to forward hydraulic pressure non-output (blocking: valve closed), the forward hydraulic valve Dva should be set to forward hydraulic pressure non-output (blocked state). Even in the case of a failure to maintain the flow state, the hydraulic pressure for outputting the forward hydraulic pressure is not applied to the input pressure port Pi of the forward hydraulic valve Dva by shutting off the forward setting solenoid valve SD. The hydraulic pressure valve Dva does not output the forward hydraulic pressure. That is, it is fail-safe.

  When neutral N is designated, the electronic control unit ECU energizes the solenoid valve SD for forward setting (thereby, SD is closed), and does not energize the solenoid valve SR for backward setting (thereby, SR is closed). In this state, as shown in FIG. 3, since the forward and reverse setting solenoid valves SD and SR are both closed, neither forward hydraulic pressure nor reverse hydraulic pressure is output. Even if one of the forward and reverse valves Dva and Rva fails and remains open, the solenoid valves SD and SR do not output line pressure, so neither forward hydraulic pressure nor reverse hydraulic pressure is output.

  When the reverse R is designated, the electronic control unit ECU energizes the solenoid valve SD for forward setting (thereby, SD is closed), and also energizes the solenoid valve SR for the backward setting (which opens SR). In this state, as shown in FIG. 4, the reverse setting solenoid valve SR outputs the line pressure to the output pressure port Po, and the reverse hydraulic valve Rva applies the line pressure to the output port Po. Output as. That is, the line pressure is output to the backward setting hydraulic line PLr. The hydraulic pressure applied from the output port Po of the reverse setting solenoid valve SR to the input pressure port Pi of the reverse hydraulic valve Rva is applied to the shut-off pressure input port Pb of the forward hydraulic valve Dva, whereby the forward hydraulic valve Dva is The flow between the input pressure port Pi and the output pressure port Po is blocked. Therefore, the forward hydraulic valve Dva is restrained so as not to output the forward hydraulic pressure.

  Even if the line pressure is output from the output pressure port Po of the forward solenoid valve SD due to some failure, the hydraulic pressure applied by the reverse solenoid valve SR and applied to the cutoff pressure port Pb of the forward hydraulic valve Dva is increased. Since the spool of the valve Dva is driven to the Po / Ex connection position in cooperation with the spring of the forward hydraulic valve Dva, the forward hydraulic pressure of the forward hydraulic valve Dva disappears. In addition, when the reverse setting solenoid valve SR is set to non-reverse hydraulic pressure output (blocking: valve closed), the reverse hydraulic valve Rva should be set to non-reverse hydraulic pressure output (blocking state). Even in the case of a failure maintaining the flow state, the hydraulic pressure for outputting the reverse hydraulic pressure is not applied to the input pressure port Pi of the reverse hydraulic valve Rva by shutting off the reverse setting solenoid valve RD. The hydraulic valve Rva does not output reverse hydraulic pressure. That is, it is fail-safe.

[Example 2]
FIG. 5 shows a range setting oil pressure switching device of the second embodiment. In this embodiment, the reverse solenoid valve SR is replaced with a normally open on / off valve from the normally closed on / off valve of the first embodiment. Accordingly, when the reverse solenoid valve SR is opened (reverse hydraulic pressure output), the electronic control unit ECU applied to the second embodiment cuts off the power supply to the reverse solenoid valve SR and closes it (reverse drive). When the hydraulic pressure is cut off, the reverse solenoid valve SR is energized. Other configurations and functions are the same as those in the first embodiment.

[Example 3]
FIG. 6 shows a range setting oil pressure switching device of the third embodiment. In this embodiment, the forward solenoid valve SD is replaced with a normally closed on / off valve from the normally open on / off valve of the first embodiment. Accordingly, the electronic control unit ECU applied to the third embodiment energizes the forward solenoid valve SD when the forward solenoid valve SD is opened (forward hydraulic output) and is closed (forward hydraulic cutoff). In this case, the energization of the forward solenoid valve SR is cut off. Other configurations and functions are the same as those in the first embodiment.

[Example 4]
FIG. 7 shows a range setting oil pressure switching device according to the fourth embodiment. In this embodiment, the forward solenoid valve SD is replaced with a normally closed on / off valve from the normally open on / off valve of the first embodiment, and the reverse solenoid valve SR is replaced with a normally closed on / off valve of the first embodiment. , Replaced with a normally open on-off valve. Accordingly, the electronic control unit ECU applied to the fourth embodiment energizes the forward solenoid valve SD when the forward solenoid valve SD is opened (forward hydraulic output) and is closed (forward hydraulic cutoff). In this case, the energization of the forward solenoid valve SR is cut off. When the reverse solenoid valve SR is opened (reverse hydraulic pressure output), the energization of the reverse solenoid valve SR is interrupted, and when the reverse solenoid valve SR is closed (reverse hydraulic pressure is interrupted), the reverse solenoid valve SR is energized. Other configurations and functions are the same as those in the first embodiment.

It is a block diagram which shows the outline | summary of the structure of the automatic transmission 100 equipped with the range setting hydraulic pressure switching apparatus 50 of 1st Example of this invention. It is a block diagram which shows the structure of the range setting hydraulic pressure switching apparatus 50 shown in FIG. 1, and shows a forward D range setting state. It is a block diagram which shows the structure of the range setting oil-pressure switching apparatus 50 shown in FIG. 1, and shows the neutral N setting state. It is a block diagram which shows the structure of the range setting hydraulic pressure switching apparatus 50 shown in FIG. 1, and shows a reverse R setting state. It is a block diagram which shows the structure of the range setting hydraulic pressure switching apparatus 50 of 2nd Example of this invention. It is a block diagram which shows the structure of the range setting hydraulic pressure switching apparatus 50 of 3rd Example of this invention. It is a block diagram which shows the structure of the range setting oil-pressure switching apparatus 50 of 4th Example of this invention.

SD: forward solenoid valve SR: reverse solenoid valve SL1 to SL5: speed stage setting solenoid valve Dva: forward hydraulic valve Rva: reverse hydraulic valve PLd: forward setting hydraulic line PLr: reverse setting hydraulic pressure line

Claims (5)

A forward setting solenoid valve and a forward hydraulic valve that is driven by the output hydraulic pressure and outputs the forward hydraulic pressure, and a reverse hydraulic pressure that is driven by the reverse setting solenoid valve and the output hydraulic pressure and outputs the reverse hydraulic pressure In the forward / reverse setting hydraulic pressure switching device equipped with a valve,
The forward setting solenoid valve has an input pressure port and an output pressure port, and opens and closes between these ports by energization / non-energization of the solenoid, and the forward hydraulic valve is the forward setting An input pressure port and a control pressure port both communicating with the output pressure port of the solenoid valve for use, and an output pressure port, and when the forward hydraulic pressure is applied to the input pressure port, the output by the corresponding hydraulic pressure of the control pressure port Ri valve der outputting the forward hydraulic to pressure port,
The reverse hydraulic valve has a cutoff pressure input port that communicates with the output pressure port of the forward setting solenoid valve, and when the forward hydraulic pressure is applied to the input pressure port of the forward hydraulic valve, the reverse hydraulic valve It is a valve that blocks the flow between the input pressure port and the output pressure port.
A forward / reverse setting hydraulic pressure switching device. The forward / reverse setting hydraulic pressure switching device according to claim 1, wherein the forward setting solenoid valve is a normally closed valve that flows between an input pressure port and an output pressure port by energization of the solenoid. The forward / reverse setting hydraulic pressure switching device according to claim 1, wherein the reverse setting solenoid valve is a normally closed valve that flows between an input pressure port and an output pressure port by energization of the solenoid. The forward / reverse setting hydraulic pressure switching device according to claim 1, wherein the reverse setting solenoid valve is a normally open valve that cuts off a flow between the input pressure port and the output pressure port by energization of the solenoid. The transmission mechanism, a solenoid valve that control the hydraulic pressure of the flow of the hydraulic circuit and the hydraulic circuit for driving the speed change mechanism, and a reverse setting hydraulic pressure switchover device before according to any one of claims 1乃Itaru 4 The forward hydraulic valve and the reverse hydraulic valve of the forward / reverse setting hydraulic pressure switching device are in the hydraulic circuit, and the forward setting solenoid valve and the reverse setting solenoid valve are in the solenoid valve group. Automatic transmission.

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