JP2004270724A - Clutch control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch control system preventing sudden "contact" of a clutch caused by erroneous operation of a clutch pedal in automatic operation. <P>SOLUTION: A cylinder 50 is provided to be connected with a clutch flow passage 25. The cylinder 50 comprises: a first piston 52, a second piston 53, and a third piston 54; a first pressure chamber 55 formed between the first piston 52 and a cylinder main body 51; a second pressure chamber 56 formed between the first piston 52 and second piston 53; a third pressure chamber 57 formed between the second piston 53 and third piston 54; a fourth pressure chamber 58 formed between the third piston 54 and cylinder main body 51; a first spring 60 disposed between the first piston 52 and second piston 53; and a second spring 61 disposed in the fourth pressure chamber 58 and having an elastic force larger than that of the first spring 60. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a clutch control system capable of connecting and disconnecting a clutch with a manual operation and an automatic operation.
[0002]
[Prior art]
8 to 15 show an example of a conventional clutch control system employed in a large vehicle such as a large truck. In FIG. 8, reference numeral 1 denotes a clutch pedal used for manual operation provided in a driver's seat, and 2 denotes a clutch pedal. A master cylinder operated by depressing the clutch pedal 1, a control device 3 for controlling automatic operation, an actuator 4 connected to the control device 3, a cylinder 5 operated by hydraulic pressure from the master cylinder 2 or the actuator 4, Reference numeral 6 denotes a clutch booster which is connected to the cylinder 5 and disconnects a clutch (not shown) via a release lever 7.
[0003]
As shown in FIG. 9, the actuator 4 includes a worm 9 that is axially driven via an electric motor 8 so as to be driven by a command from the control device 3. The worm 9 includes a worm wheel that rotates via a fulcrum pin 10. At the end of the worm wheel 11, a push rod 13 configured via a connecting pin 12 is arranged at the end of the worm wheel 11 so as to be able to move in the front-rear direction in accordance with the rotation of the worm wheel 11. Here, the worm 9, the worm wheel 11, and the push rod 13 are housed in a housing 14, and the housing 14 forms a piston case 15. An actuator piston 18 is arranged at the tip of the push rod 13 so as to compress the pressure chamber 16 in the piston case 15 and to supply hydraulic oil to the cylinder 5 from the flow path 17. Is disposed on the push rod 13 side.
[0004]
As shown in FIG. 10, the cylinder 5 has a first piston 21 and a second piston 22 disposed in a cylinder body 20, and is connected to the flow path 23 of the master cylinder 2 between the first piston 21 and the cylinder body 20. A first pressure chamber 24 is formed. Between the first piston 21 and the second piston 22, a second pressure chamber 26 connected to the clutch booster 6 via a clutch flow path 25 is formed. A third pressure chamber 27 connected to the flow path 17 of the actuator 4 is formed between the piston 22 and the cylinder body 20, and a fourth pressure chamber communicating with the third pressure chamber 27 is formed inside the second piston 22. And a relief valve 29 that is pressed toward the fourth pressure chamber 28 by the hydraulic pressure of the second pressure chamber 26, and is disposed between the first piston 21 and the second piston 22 in the second pressure chamber 26. Be the first Comprising a pulling 30, the fourth pressure chamber 28, a ball 31 which is pressed by the movement of the relief valve 29 are arranged and a second spring 32 which impetus the ball 31 in the relief valve 29 side. In addition, the second piston 22 communicates with the fourth pressure chamber 28 and the third pressure chamber 27 through a flow path 33 so as to discharge hydraulic fluid into and from a reservoir (not shown) depending on the state of the relief valve 29 and the ball 31. A hole 34 is formed.
[0005]
As shown in FIGS. 8 and 11, the clutch booster 6 includes a hydraulic piston 35 and a relay piston portion 36 on which hydraulic oil from the cylinder 5 acts. One end of the hydraulic piston 35 is connected to the release lever 7. A hydraulic piston 35 is connected to the other end of the hydraulic piston 35. The hydraulic piston 35 is provided with a compressed air piston 39 that can move in a cylinder shell 38. 40, a poppet valve 41 overstressed by a spring (not shown), and an exhaust port 42 for discharging air. Air flows out to an air flow path 43 formed by the arrangement of the relay piston main body 40. An air tank 44 is connected to the relay piston main body 40 so that the air flow path 45 is formed inside the relay piston main body 40. .
[0006]
When operating the clutch, in the case of manual operation, when the driver depresses the clutch pedal 1, the hydraulic oil is passed by the master cylinder 2 and the cylinder 5 through the clutch flow path 25 and the hydraulic piston 35 and the relay piston portion 36. At the relay piston portion 36, the relay piston body 40 slides to the left in the drawing, thereby pushing the poppet valve 41 to the left to open the air circuit of the poppet valve 41 (see FIG. 11). Compressed air flows from the air tank 44 into the cylinder shell 38 via the air circuit of the poppet valve 41, the air channel 43, and the pipe 43a, and the compressed air piston 39 is pushed to the left by the assist of the compressed air. Further, the release lever 7 is pushed through the hydraulic piston 35 and the push rod 37, Clutch release lever 7 is not shown in operation is "OFF". Here, as shown in FIG. 12, the first piston 21 of the cylinder 5 moves to compress the second pressure chamber 26 and the first spring 30 so that the hydraulic oil is supplied to the clutch booster 6 through the clutch flow path 25. Is being pumped.
[0007]
When the clutch pedal 1 is returned, hydraulic oil is sucked from the hydraulic piston 35 and the relay piston portion 36 of the clutch booster 6 by the master cylinder 2 and the cylinder 5 through the clutch flow path 25, and the relay piston portion 36 The body 40 and the poppet valve 41 are returned to the right side in FIG. 11 by the restoring force of a spring (not shown), the air circuit for the air tank 44 side is closed, and the compressed air behind the compressed air piston 39 in the cylinder shell 38 is released by the relay piston. The hydraulic piston 35 and the push rod 37 connected to the compressed air piston 39 enter the front of the compressed air piston 39 in the cylinder shell 38 through the pipe 43a of the main body 40 and the air passages 43 and 45. When the release lever 7 is returned to the Clutch (not shown) by is "contact". Here, the first piston 21 of the cylinder 5 is returned to the original position by the residual force of the first spring 30, and at the same time, the operating oil is returned from the clutch booster 6 to the second pressure chamber 26.
[0008]
In the case of the automatic operation, when a predetermined command is issued from the control device 3, the worm 9 rotates through the electric motor 8 so that the worm wheel 11 rotates to push out the push rod 13 and the actuator piston 18, and the actuator piston 18 Compresses the pressure chamber 16 and sends hydraulic oil to the cylinder 5 from the flow path 17. In the cylinder 5, as shown in FIG. 13, the second piston 22 compresses the second pressure chamber 26 and the first spring 30. As a result, the hydraulic oil reaches the hydraulic piston 35 and the relay piston portion 36 of the clutch booster 6 via the clutch flow passage 25, and is driven substantially in the same manner as in the manual operation, so that the clutch is “disengaged”. .
[0009]
Further, when a predetermined command is issued from the control device 3, the worm 9 rotates in the reverse direction via the electric motor 8, whereby the worm wheel 11 rotates in the reverse direction, pulling back the push rod 13 and the actuator piston 18, and the pressure chamber. Hydraulic oil is sucked from the cylinder 5 so as to return the hydraulic oil 16 to the original position. In the cylinder 5, the second piston 22 is further biased by the first spring 30 to return to the original position. Then, the suction is performed from the relay piston section 36, and the drive is performed in substantially the same manner as in the manual operation, so that the relay piston clutch is brought into "contact".
[0010]
On the other hand, if the driver accidentally depresses the clutch pedal 1 while the second piston 22 of the cylinder 5 is moving by automatic operation (half-clutch state), as shown in FIG. Even if the amount of the hydraulic oil is small, the movement of the first piston 21 supplies the hydraulic oil, causes a clutch stroke sensor (not shown) to determine that the necessary stroke has been completed, and stops the pressure feed from the actuator 18. The second piston 22 is stopped. Further, when the first piston 21 moves by further depressing the clutch pedal 1, as shown in FIG. 15, the relief valve 29 of the cylinder 5 pushes the ball 31, and the fourth pressure chamber 28 and the third pressure chamber 27 Drain hydraulic fluid into reservoir. The working oil is gradually returned to the fourth pressure chamber 28 and the third pressure chamber 27 by the reservoir. Here, as prior art documents related to the cylinder of the clutch control system, the following Patent Documents 1 and 2 already exist.
[0011]
[Patent Document 1]
JP-A-9-269022 [Patent Document 2]
JP, 2002-220661, A
[Problems to be solved by the invention]
However, in the above-described clutch control system, when the second piston 22 of the cylinder 5 is being moved by the automatic operation (half-clutch state), the driver accidentally depresses the clutch pedal 1 and notices the automatic operation. When the clutch pedal 1 is returned in a hurry, when the hydraulic oil is not present in the third pressure chamber 27 (the second piston 22 is at the right end in the cylinder body 20), the first piston 21 is moved to the left side in the cylinder body 20. Since the operating oil is rapidly returned to the end position and the hydraulic oil is suddenly moved from the clutch booster 6 to the second pressure chamber 26, the clutch is brought into "contact", and there is a problem that the vehicle suddenly starts.
[0013]
The present invention has been made in view of the above circumstances, and has as its object to provide a clutch control system that prevents a clutch from becoming “engaged” due to an erroneous operation of a clutch pedal during an automatic operation.
[0014]
[Means for Solving the Problems]
Claim 1 of the present invention is a cylinder connected to a clutch flow path for engaging and disengaging a clutch, a manual pumping means for pumping hydraulic oil to the cylinder, and an automatic pumping means for pumping hydraulic oil to the cylinder. And outflow / inflow means for inflow / outflow of hydraulic oil from / to the cylinder,
The first cylinder, a first piston and a second piston and a third piston disposed in the cylinder body, a first pressure chamber formed between the first piston and the cylinder body and connected to a manual pumping means, A second pressure chamber formed between one piston and the second piston and connected to the clutch flow path, and a third pressure chamber formed between the second piston and the third piston and connected to the auto-pumping means. A fourth pressure chamber formed between the third piston and the cylinder body and connected to the inflow / outflow means, a first spring disposed between the first piston and the second piston in the second pressure chamber, A clutch control system comprising a fourth spring disposed between the third piston and the cylinder body in the four pressure chambers and having a second spring having a larger elastic force than the first spring. A.
[0015]
Claim 2 of the present invention is a cylinder connected to a clutch flow path for engaging and disengaging a clutch, a manual pumping unit for pumping hydraulic oil to the cylinder, and an automatic pumping unit for pumping hydraulic oil to the cylinder. And outflow / inflow means for inflow / outflow of hydraulic oil from / to the cylinder,
The cylinder has a first piston, a second piston, and a third piston disposed in the cylinder main body, a first pressure chamber formed between the first piston and the cylinder main body, and connected to an automatic pumping means, A second pressure chamber formed between one piston and the second piston and connected to the clutch flow path, and a third pressure chamber formed between the second piston and the third piston and connected to the manual pumping means. A fourth pressure chamber formed between the third piston and the cylinder body and connected to the inflow / outflow means, a first spring disposed between the first piston and the second piston in the second pressure chamber, A clutch control system comprising a fourth spring disposed between the third piston and the cylinder body in the four pressure chambers and having a second spring having a larger elastic force than the first spring. A.
[0016]
According to a third aspect of the present invention, the cylinder can connect and disconnect the clutch via the clutch flow path by pumping the hydraulic oil from one of the manual pumping means and the automatic pumping means. 2. The system according to claim 1, wherein, even when the hydraulic oil is pumped from the manual pumping means at the time of pumping, the hydraulic oil is caused to flow out of the cylinder by the inflow / outflow means and the amount of the hydraulic oil pumped by the automatic pumping means is maintained. Or the clutch control system according to 2.
[0017]
According to a fourth aspect of the present invention, there is provided the clutch control system according to the first, second or third aspect, wherein a stopper for stopping the flow of the hydraulic oil in the clutch flow path is formed.
[0018]
According to a fifth aspect of the present invention, there is provided the clutch control system according to the first, second, third or fourth aspect, wherein the elastic force of the second spring is configured to be larger than the pressure of the hydraulic oil fed from the automatic pumping means. It is related.
[0019]
In the first aspect, when the clutch is disengaged by a manual operation, the first piston is moved by a manual pressure feeding means, whereby hydraulic oil is fed from the second pressure chamber through the clutch flow path to disconnect the clutch. Contact When the clutch is connected and disconnected by the automatic operation, the hydraulic oil is pumped from the second pressure chamber through the clutch flow path by moving the second piston by the automatic pressure feeding means to disconnect and connect the clutch. I do. Further, if the driver mistakenly operates the manual pumping means while the second piston of the cylinder is moving by the automatic operation, the first piston moves to disengage the clutch, and The first spring, the second piston, and the third piston move to compress the second spring and discharge the hydraulic oil in the fourth pressure chamber to the inflow / outflow means so as to maintain the amount of hydraulic oil in the pressure chamber. When the manual pumping means is returned in a hurry, the hydraulic oil is sucked by the automatic pumping means, the first piston returns to the original position, and the second piston and the third piston operate the third pressure chamber. Moved by the second spring while maintaining the amount of oil to maintain the "disengagement" of the clutch.
[0020]
When the clutch is manually engaged or disengaged in the second aspect, the second piston is moved by the manual pumping means, whereby hydraulic oil is pumped from the second pressure chamber via the clutch flow path to disconnect the clutch. Contact When the clutch is connected or disconnected by the automatic operation, the first piston is moved by the auto-pumping means, so that the operating oil is pressure-supplied from the second pressure chamber through the clutch flow path to connect and disconnect the clutch. I do. Further, if the driver mistakenly operates the manual pumping means while the first piston of the cylinder is moving by the automatic operation, the second piston moves to disengage the clutch, and The third piston moves to compress the second spring and discharge the hydraulic oil in the fourth pressure chamber to the inflow / outflow means so as to maintain the amount of hydraulic oil in the pressure chamber. When the manual pumping means is returned in a hurry, the hydraulic oil is sucked by the manual pumping means, the second piston and the third piston are moved by the second spring, and the first piston is moved to the first pressure chamber. It is located with the amount of hydraulic oil maintained, and maintains "disengagement" of the clutch.
[0021]
As described above, according to the first, second, or third aspect, even when the driver erroneously operates the manual pumping unit and returns the manual pumping unit in a hurry during the automatic operation, the second spring is used. The third piston is pushed back, and the amount of hydraulic oil is kept in the pressure chamber on the auto operation side of the cylinder, so that the clutch does not come into contact and consequently the sudden start of the vehicle due to erroneous operation of the clutch pedal is prevented. can do.
[0022]
According to a fourth aspect of the present invention, when the stopper for stopping the flow of the hydraulic oil in the clutch flow path is formed, even if the driver mistakenly operates the manual pumping means during the automatic operation, the first piston between the first piston and the second piston is operated. (2) Since the third piston is moved while maintaining the amount of hydraulic oil in the pressure chamber, the hydraulic oil in the fourth pressure chamber is reliably discharged to the inflow / outflow means, and the clutch is preferably prevented from being in "contact". Can be.
[0023]
When the elastic force of the second spring is configured to be larger than the pressure of the hydraulic oil pumped by the automatic pumping means, the normal force of the cylinder during normal operation of the automatic pumping means is provided. The second spring can be compressed without compressing the first spring, and when the driver mistakenly operates the manual pumping means during the automatic operation, the second spring can be compressed. The movement of the piston and the third piston can be made favorable.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIGS. 1 to 6 show a first embodiment of the present invention, in which the structure of a conventional cylinder 5 is changed, and the parts denoted by the same reference numerals as those in FIGS. Represents.
[0026]
In the cylinder 50 of the clutch control system of the first example, a first piston 52, a second piston 53, and a third piston 54 are arranged in a cylinder body 51 in order from the left, and between the first piston 52 and the cylinder body 51. A first pressure chamber 55 connected to the master cylinder 2 of the clutch pedal 1 of the manual pumping means via the flow path 23, and a clutch of the clutch booster 6 is provided between the first piston 52 and the second piston 53. A second pressure chamber 56 connected to the flow path 25 is formed. Between the second piston 53 and the third piston 54, a third pressure chamber connected to the actuator 4 of the automatic pressure feeding means via the flow path 17 A fourth pressure chamber 58 is formed between the third piston 54 and the cylinder body 51 and is connected to a reservoir (not shown) of the inflow / outflow means via the flow path 33. It is formed. Oil seals 59 are provided at both ends of the first piston 52 and the second piston 53.
[0027]
Further, a first spring 60 is disposed in the second pressure chamber 56 of the cylinder 50 so as to be located between the first piston 52 and the second piston 53, and a third piston 54 and a cylinder are disposed in the fourth pressure chamber 58. The second spring 61 is arranged so as to be located between the main bodies 51. Here, the elastic force of the second spring 61 is set to be larger than the elastic force of the first spring 60 and larger than the hydraulic pressure at the time of either the manual operation or the automatic operation.
[0028]
On the other hand, as shown in FIG. 8, the clutch booster 6 prevents an overstroke of the hydraulic piston 35 and prevents the hydraulic oil from flowing through the clutch flow path at the end of the hydraulic piston cover 35a that houses the hydraulic piston 35. A stopper 35b for stopping is provided. Here, the stopper 35b may be provided at an intermediate position of the clutch flow path 25.
[0029]
Further, the clutch pedal may be provided with a plurality of switches (not shown) that contact when the pedal is depressed or returned and give commands to the control means.
[0030]
Hereinafter, the operation of the first embodiment of the present invention will be described.
[0031]
In the first example, when the clutch is “disengaged” by manual operation, the first spring 60 of the cylinder 50 is compressed by depressing the clutch pedal 1 via the master cylinder 2 and the flow path 23 as shown in FIG. Then, the first piston 52 is moved so that the hydraulic oil is pressure-fed from the second pressure chamber 56 to the clutch booster 6 via the clutch flow path 25 to "disengage" the clutch. At this time, the second spring 61 is not compressed, and at the same time, the second piston 53 and the third piston 54 do not move. Further, when the clutch is brought into the "engaged" state by manual operation, the first piston 52 is returned to the original position so that the first spring 60 of the cylinder 50 is extended via the master cylinder 2 and the flow path 23 by returning the clutch pedal 1. And the hydraulic oil is returned from the clutch booster 6 to the second pressure chamber 56 of the cylinder 50 via the clutch flow path 25 to bring the clutch into "contact".
[0032]
In the first example, when the clutch is to be “disengaged” by the automatic operation, the actuator 4 is driven by a command of the control device 3 so that the first spring 60 of the cylinder 50 is passed through the flow path 17 as shown in FIG. The second piston 53 is moved so as to compress the hydraulic fluid, and the hydraulic oil is pressure-fed from the second pressure chamber 56 to the clutch booster 6 through the clutch flow passage 25 to disconnect the clutch. At this time, the second spring 61 is not compressed, and at the same time, the third piston 54 does not move. When the clutch is brought into "engagement" by the automatic operation, the second piston 53 is extended through the flow path 17 by extending the first spring 60 via the flow path 17 by driving the actuator 4 in reverse according to a command from the control device 3. Is returned to the original position, the operating oil is returned from the clutch booster 6 to the second pressure chamber 56 of the cylinder 50 via the clutch flow path 25, and the clutch is brought into "contact".
[0033]
As shown in FIG. 4, when the driver accidentally depresses the clutch pedal 1 while the second piston 53 of the cylinder 50 is moving by the automatic operation (half-clutch state), first, FIG. As shown in FIG. 5, the first piston 52 moves to compress the first spring 60, and the hydraulic oil is pressure-fed from the second pressure chamber 56 to the clutch booster 6 via the clutch flow path 25 to “disengage” the clutch. Next, as shown in FIG. 6, the first piston 52 moves further, and the second piston 53 and the third piston 54 move so that the amount of hydraulic oil in the third pressure chamber 57 is maintained. And the hydraulic oil in the fourth pressure chamber 58 flows out to the reservoir via the flow path 33. Also, when the clutch pedal 1 is returned in a hurry after noticing the automatic operation, the hydraulic oil is sucked by the master cylinder 2, the first piston 52 returns to the original position, and the second piston 53 and the third piston 54 are returned. Is pushed back by the second spring 61 in a state where the amount of hydraulic oil in the third pressure chamber 57 supplied by the actuator 4 is maintained, and the “disengagement” of the clutch is maintained. Here, the amount of the hydraulic oil in the third pressure chamber 57 does not change when the clutch stroke sensor (not shown) determines that the clutch is “disengaged” and the actuator 4 is stopped. Further, the amount of the hydraulic oil in the second pressure chamber 56 is determined by stopping the flow of the hydraulic oil in the clutch flow path 25 by stopping the hydraulic piston 35 of the clutch booster 6 at the stopper 35b while the clutch is in the “disengaged” state. ,It does not change.
[0034]
As described above, according to the first example, even when the driver accidentally depresses the clutch pedal 1 during the automatic operation and notices the automatic operation and returns the clutch pedal 1 in a hurry, the third pressure chamber of the cylinder 50 can be used. Since the amount of hydraulic oil is maintained at 57 and the third piston 54 and the second piston 53 are pushed back by the second spring 61, the clutch does not come into "contact", and as a result, the vehicle due to erroneous operation of the clutch pedal 1 Sudden start can be prevented.
[0035]
When the stopper 35b for stopping the flow of the hydraulic oil in the clutch flow path is formed, even when the driver accidentally depresses the clutch pedal 1 during the automatic operation, the second piston 53 between the first piston 52 and the second piston 53 is formed. Since the third piston 54 is moved while maintaining the amount of the hydraulic oil in the pressure chamber 56, the hydraulic oil in the fourth pressure chamber 58 is reliably discharged to the reservoir, and the clutch is preferably prevented from being "connected". Can be.
[0036]
When the elastic force of the second spring 61 is configured to be larger than the pressure of the hydraulic oil pumped from the actuator 4 of the automatic pumping means, the second spring 61 of the cylinder 50 is operated during normal operation of the actuator 4. Is compressed without compressing the first spring 60, and when the driver accidentally depresses the clutch pedal 1 during the automatic operation, the second spring 61 is compressed. The movement of the piston 53 and the third piston 54 can be made suitable.
[0037]
FIG. 7 shows a second example of the embodiment of the present invention, in which the connection of the manual pumping means and the automatic pumping means to the cylinder 50 of the first example is changed, and the same reference numerals as those in the first example are used. The parts shown are the same.
[0038]
The cylinder 62 of the clutch control system of the second example has a first spring 52, a second piston 53, and a third piston 54 arranged in order from the left in a cylinder main body 51 in the same manner as the first example. 60 and a second spring 61 are provided.
[0039]
A first pressure chamber 55 is formed between the first piston 52 and the cylinder body 51 and connected to the actuator 4 of the automatic pressure feeding means via the flow path 17, and is formed between the first piston 52 and the second piston 53. Forms a second pressure chamber 56 connected to the clutch flow path 25 of the clutch booster 6, and flows between the second piston 53 and the third piston 54 to the master cylinder 2 of the clutch pedal 1 of the manual pumping means. A fourth pressure chamber 57 is formed between the third piston 54 and the cylinder body 51 and connected to a reservoir (not shown) through the flow path 33 between the third piston 54 and the cylinder body 51. 58 are formed. Oil seals 59 are provided at both ends of the first piston 52 and the second piston 53.
[0040]
On the other hand, the clutch booster 6 prevents an overstroke of the hydraulic piston 35 at the end of the hydraulic piston cover 35a accommodating the hydraulic piston 35 and supplies the hydraulic oil in the clutch flow path in substantially the same manner as in the first example. A stopper 35b for stopping the flow is provided. Here, the stopper 35b may be provided at an intermediate position of the clutch flow path 25.
[0041]
Hereinafter, the operation of the second embodiment of the present invention will be described.
[0042]
In the second example, when the clutch is “disengaged” by manual operation, the second piston is compressed by pressing the clutch pedal 1 to compress the first spring 60 of the cylinder 62 via the master cylinder 2 and the flow path 23. 53 is moved, and the hydraulic oil is pressure-fed from the second pressure chamber 56 to the clutch booster 6 via the clutch flow path 25 to “disengage” the clutch. At this time, the second spring 61 is not compressed, and at the same time, the third piston 54 does not move. Also, when the clutch is brought into the "engaged" state by manual operation, the second piston 53 is returned to the original position so that the first spring 60 of the cylinder 62 is extended via the master cylinder 2 and the flow path 23 by returning the clutch pedal 1. , And the hydraulic oil is returned from the clutch booster 6 to the second pressure chamber 56 of the cylinder 62 via the clutch flow path 25 to bring the clutch into "contact".
[0043]
In the second example, when the clutch is “disengaged” by the automatic operation, the first spring 60 of the cylinder 62 is compressed via the flow path 17 by driving the actuator 4 according to a command from the control device 3. One piston 52 is moved, and the hydraulic oil is pressure-fed from the second pressure chamber 56 to the clutch booster 6 via the clutch flow path 25 to “disengage” the clutch. At this time, the second spring 61 is not compressed, and at the same time, the second piston 53 and the third piston 54 do not move. When the clutch is brought into "engagement" by the automatic operation, the first piston 52 is extended through the flow path 17 by driving the actuator 4 in reverse according to a command from the control device 3. Is returned to the original position, and the operating oil is returned from the clutch booster 6 to the second pressure chamber 56 of the cylinder via the clutch flow path 25 to bring the clutch into "contact".
[0044]
If the driver accidentally depresses the clutch pedal 1 while the first piston 52 of the cylinder 62 is moving by the automatic operation (half-clutch state), first, the second piston 53 moves. The first spring 60 is compressed, hydraulic fluid is pressure-fed from the second pressure chamber 56 to the clutch booster 6 via the clutch flow path 25 to disconnect the clutch, and then the amount of hydraulic fluid in the first pressure chamber 55 is reduced. The third piston 54 "moves to compress the second spring 61, and at the same time, causes the hydraulic oil in the fourth pressure chamber 58 to flow out to the reservoir. In this case, the hydraulic oil is sucked by the master cylinder 2, the second piston 53 returns to the original position, the third spring 54 is pushed back by the second spring 61, and the first piston 52 Located in a state of keeping the amount of working oil in the first pressure chamber 55 supplied by the actuator 4, to maintain the "OFF" of the clutch. Here, the amount of hydraulic oil in the first pressure chamber 55 does not change when the clutch stroke sensor (not shown) determines that the clutch is “disengaged” and the actuator 4 is stopped. Further, the amount of the hydraulic oil in the second pressure chamber 56 is determined by stopping the flow of the hydraulic oil in the clutch flow path 25 by stopping the hydraulic piston 35 of the clutch booster 6 at the stopper 35b while the clutch is in the “disengaged” state. ,It does not change.
[0045]
As described above, according to the second example, the same operation and effect as those of the first example can be obtained.
[0046]
Note that the clutch control system of the present invention is not limited to the above embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.
[0047]
【The invention's effect】
According to the clutch control system of the present invention described above, at the time of automatic operation, even if the driver mistakenly operates the manual pumping means and returns the manual pumping means in a hurry, the third piston is pushed back by the second spring and Since the amount of hydraulic oil is maintained in the pressure chamber on the automatic operation side of the cylinder, the clutch does not come into "contact", and as a result, sudden start of the vehicle due to erroneous operation of the clutch pedal can be prevented. Excellent effects can be achieved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a cylinder according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state of a first example cylinder in which a clutch is “disengaged” by depressing a clutch pedal.
FIG. 3 is a cross-sectional view illustrating a state of a cylinder of a first example in which a clutch is “disengaged” by operation of an actuator.
FIG. 4 is a cross-sectional view showing a state of a cylinder of a first example in which a half-clutch state is established by operation of an actuator.
FIG. 5 is a cross-sectional view showing a state of the cylinder of the first example in which the clutch pedal is depressed from FIG.
FIG. 6 is a sectional view showing a state of the cylinder of the first example in which the clutch pedal is further depressed from FIG. 5;
FIG. 7 is a sectional view showing a cylinder according to a second embodiment of the present invention.
FIG. 8 is a schematic diagram showing a clutch control system.
FIG. 9 is a sectional view showing an actuator of the clutch control system.
FIG. 10 is a sectional view showing a conventional cylinder.
FIG. 11 is an enlarged sectional view showing a relay piston portion of the clutch booster.
FIG. 12 is a cross-sectional view showing a state of a conventional cylinder in which the clutch is “disengaged” by depressing a clutch pedal.
FIG. 13 is a cross-sectional view showing a state of a conventional cylinder in which a clutch is “disengaged” by operation of an actuator.
FIG. 14 is a sectional view showing a state of a conventional cylinder in which a clutch pedal is depressed in a half-clutch state by actuation of an actuator.
FIG. 15 is a sectional view showing a state of a conventional cylinder in which the clutch pedal is further depressed from FIG.
[Explanation of symbols]
1 clutch pedal (manual pumping means)
2 Master cylinder (manual pumping means)
3 control device (automatic pressure feeding means)
4 Actuator (automatic pressure feeding means)
25 Clutch flow path 50 Cylinder 51 Cylinder main body 52 First piston 53 Second piston 54 Third piston 55 First pressure chamber 56 Second pressure chamber 57 Third pressure chamber 58 Fourth pressure chamber 60 First spring 61 Second spring 62 Cylinder

Claims (5)

A cylinder connected to a clutch flow path for engaging and disengaging a clutch, a manual pumping unit for pumping hydraulic oil to the cylinder, an automatic pumping unit for pumping hydraulic oil to the cylinder, and a hydraulic oil flowing out of the cylinder Outflow and inflow means
The first cylinder, a first piston and a second piston and a third piston disposed in the cylinder body, a first pressure chamber formed between the first piston and the cylinder body and connected to a manual pumping means, A second pressure chamber formed between one piston and the second piston and connected to the clutch flow path, and a third pressure chamber formed between the second piston and the third piston and connected to the auto-pumping means. A fourth pressure chamber formed between the third piston and the cylinder body and connected to the inflow / outflow means, a first spring disposed between the first piston and the second piston in the second pressure chamber, A clutch control system, comprising: a fourth spring disposed between the third piston and the cylinder body in the four pressure chambers, the second spring having a greater elastic force than the first spring. A cylinder connected to a clutch flow path for engaging and disengaging a clutch, a manual pumping unit for pumping hydraulic oil to the cylinder, an automatic pumping unit for pumping hydraulic oil to the cylinder, and a hydraulic oil flowing out of the cylinder Outflow and inflow means
The cylinder has a first piston, a second piston, and a third piston disposed in the cylinder body, a first pressure chamber formed between the first piston and the cylinder body, and connected to an automatic pumping means, A second pressure chamber formed between one piston and the second piston and connected to the clutch flow path, and a third pressure chamber formed between the second piston and the third piston and connected to the manual pumping means. A fourth pressure chamber formed between the third piston and the cylinder body and connected to the inflow / outflow means, a first spring disposed between the first piston and the second piston in the second pressure chamber, A clutch control system, comprising: a fourth spring disposed between the third piston and the cylinder body in the four pressure chambers, the second spring having a greater elastic force than the first spring. The cylinder can connect and disconnect the clutch via the clutch flow path by pumping the hydraulic oil from either the manual pumping unit or the automatic pumping unit, and actuate the manual pumping unit during the pumping of the operating oil by the automatic pumping unit. 3. The clutch control system according to claim 1, wherein, even when the oil is pumped, the hydraulic oil is caused to flow out of the cylinder by the inflow / outflow means, and the amount of the hydraulic oil in the cylinder pumped by the automatic pressure feeding means is maintained. 4. The clutch control system according to claim 1, wherein a stopper for stopping a flow of hydraulic oil in the clutch flow path is formed. 5. The clutch control system according to claim 1, wherein the elastic force of the second spring is configured to be larger than the pressure of the hydraulic oil pumped by the automatic pumping means.

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