JPH09250563A - Clutch booster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pulsation of cylinder liquid pressure, by communicating the inside passage of a relay piston with the air pressure chamber of a power cylinder part, to form the action part of working liquid from a master cylinder on the relay piston side surface part. SOLUTION: Working liquid from a master cylinder passes through an input port 31 and a liquid chamber 28, to be pressure-fed to the liquid pressure chamber 16 of a control valve part 41. When pedaling a clutch is stopped, the liquid pressure in the liquid pressure chamber 16 is reduced, to make a relay piston 50 recede from a relay valve 51 by a coil spring and the air pressure in a voltage transforming chamber 17, to make the relay valve 51 abut on a valve seat 21 by the coil spring 20, thereby stopping compressed air from an air reservoir. An inner passage, from the voltage transforming chamber 17 to the atmospheric pressure chamber 11 of a power cylinder part 43 is formed via a through hole 57, to lead compressed air in a pressure chamber 12 of the power cylinder part 43 into the atmospheric pressure chamber 11 from a line 24. Consequently, the balance of the relay piston 50 at the time of exhaust operation is kept to cause no pulsation in master cylinder liquid pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch booster capable of preventing pulsation generated in master cylinder hydraulic pressure and improving pedal feeling.

[0002]

2. Description of the Related Art As a conventional clutch operating system,
There is one shown in FIG. In this operation system, the master cylinder 2 is operated by depressing the clutch pedal 1, and the control valve unit 4 of the clutch booster 3 is operated by the hydraulic pressure supplied from the master cylinder 2. Then, the piston 7 of the power cylinder 6 is operated by the compressed air supplied from the air reservoir 5 via the control valve unit 4, and the output rod 8 for clutch operation is operated by the doubled operating force generated by the operation of the piston 7. Activate.

FIG. 5 shows a conventional clutch booster 3. The clutch booster 3 operates a power valve 7 by a control valve unit 4 which is operated by a hydraulic pressure supplied from a master cylinder 2 and compressed air which is supplied from an air reservoir 5 by the operation of the control valve unit 4. It is composed of a power cylinder portion 6 and a relay means 9 for operating the output rod 8 for clutch operation by the operation of the power piston 7.

The power cylinder portion 6 is a housing 1
No. 0 shell 10a. This shell 10
A power piston 7 is provided in the inside of the shell 10a, and the power piston 7 moves the inside of the shell 10a into the atmospheric pressure chamber 1.
1 and a pressure chamber 12. The power piston 7 is attached to the left side in the drawing by a spring 13 provided in the atmospheric pressure chamber 11 when the control valve unit 4 is in a non-operating state. The power piston 7 is provided with a piston rod 14 that operates the push rod 8.

The control valve portion 4 is a housing 1
It is configured in the cylinder hole 10b provided at 0.
A relay piston 15 is slidably mounted in the cylinder hole 10b, and the relay piston 15 defines the cylinder hole 10b into a hydraulic chamber 16 and a variable pressure chamber 17. The relay piston 15 has an axial passage 15a.
Is formed at one end of the passage 15a, and the other end is opened from the passage 15b provided at the side wall to the exhaust port 1 provided at the housing 10.
It is open to the atmosphere via 8. The cylinder hole 10
In b, a relay valve 19 is arranged on the extension line of the tip end surface of the relay piston 15.
Are arranged so as to face the tip surface of the relay piston 15. This relay valve 19 has a control valve section 4
In the non-operating state, the coil spring 20 contacts the valve seat 21 by the urging force of the coil spring 20 and disconnects the variable pressure chamber 17 from the compressed air supply port 22. The relay piston 15 is biased in the direction away from the relay valve 19 by the biasing force of the coil spring 23 to form a gap between the relay piston 15 and the variable pressure chamber 17 when the control valve portion 4 is in the non-operating state. Communicates with the inside of the passage 15a. The variable pressure chamber 17 communicates with the pressure chamber 12 via a conduit 24 from a passage (not shown) provided in the housing 10, and is supplied from the air reservoir 5 through the compressed air supply port 22 with the opening operation of the relay valve 19. The compressed air is supplied to the pressure chamber 12. On the other hand, the passage 15 b communicating with the exhaust port 18 is communicated with the atmospheric pressure chamber 11 via a passage 25 provided in the housing 10.

The relay means 9 is formed in a cylinder hole 10c provided in the housing 10. Cylinder hole 1
At 0c, a free piston 26 and a relay piston 27 are provided, and a liquid chamber 28 is provided between these free piston 26 and the relay piston 27. The liquid chamber 28 is communicated with the hydraulic chamber 16 of the control valve portion 4 by a passage 29 formed in the housing 10, and the input port 31 is formed by a passage 30 provided in the housing 10.
Is communicated to.

Piston rod 1 of the power piston 7
4 is a guide block 3 installed in the cylinder hole 10c
2 and the free piston 26, and reaches one end surface of the relay piston 27. An output rod 8 for operating the clutch is provided on the other end surface of the relay piston 27. The output rod 8 is pulled out to the outside of the boot 33 provided at the open end of the cylinder hole 10c, and a clutch operating lever (not shown) is provided. Is to operate. On the outer peripheral surface of the relay piston 15, in order to define the cylinder hole 10b into the hydraulic chamber 16 and the variable pressure chamber 17, packings 34, 3 are formed.
5 are provided.

The operation of the clutch booster 3 will be described. The master cylinder 2 is operated by depressing the clutch pedal 1, and the hydraulic fluid supplied from the master cylinder 2 is pressure-fed to the liquid chamber 28 of the relay means 9 via the input port 31 and the passage 30, and further, the passage The pressure is fed to the hydraulic chamber 16 of the control valve unit 4 through 29. The relay piston 15 moves to the right in the drawing against the urging force of the coil spring 23 by the hydraulic pressure of the hydraulic fluid introduced into the hydraulic chamber 16, contacts the relay valve 19, and the passage 15
While closing a, the relay valve 19 is pressed and opened. When the relay valve 19 is opened, the compressed air supplied from the air reservoir 5 becomes compressed air supply port 2
2 is supplied to the transformer room 17. The compressed air supplied to the variable pressure chamber 17 is introduced into the pressure chamber 12 via the pipe line 24, and operates the power piston 7 of the power cylinder unit 6. Then, the power piston 7 operates rightward in the figure against the biasing force of the spring 13 and operates the piston rod 14. The operation of the piston rod 14 operates the output rod 8 to the right through the relay piston 27 and operates the clutch operating lever to disengage the clutch.

On the other hand, when the depression of the clutch pedal 1 is stopped and returned, the hydraulic pressure in the hydraulic pressure chamber 16 of the control valve portion 4 is reduced, and the relay piston 15 moves to the coil spring 23.
It moves to the left in the drawing by the urging force of the valve and the air pressure in the variable pressure chamber 17, and separates from the relay valve 19. As the relay piston 15 separates, the relay valve 19
The urging force of the coil spring 20 works and the relay valve 1
9 contacts the valve seat 21 to stop the compressed air supplied from the air reservoir 5. In this way, the compressed air supplied to the pressure chamber 12 passes from the pipe line 24 to the passage 15 via the variable pressure chamber 17.
The air is released to the atmosphere through the exhaust port 18 provided in the housing 10 through a and the passage 15b.

[0010]

In the conventional clutch booster 3 described above, the relay piston 15 and the relay valve 19 are provided.
While repeatedly opening and closing, the hydraulic pressure of the master cylinder 2 and the working pressure of the compressed air supplied from the air reservoir 5 are balanced. For this reason, the exhaust pressure acts on the exhaust side packing 35 of the relay piston 15, and the relay piston 15 is returned by the action of the exhaust pressure, which may cause imbalance. As a result, pulsation is generated in the hydraulic pressure of the master cylinder 2, and when the pulsation becomes large, there is a drawback that the pedal feel deteriorates.

The present invention has been made in order to solve the above-mentioned conventional problems, and its purpose is to prevent generation of pulsation in the master cylinder hydraulic pressure because exhaust pressure is not applied to the exhaust side packing of the relay piston. It is an object of the present invention to provide a clutch booster device capable of preventing the above and improving the pedal feeling.

[0012]

In order to solve the above-mentioned problems, the present invention operates a master cylinder by depressing a clutch pedal, and operates a relay piston by a hydraulic fluid supplied from the master cylinder. The relay valve installed in parallel with the relay piston is opened, compressed air is supplied to the pressure chamber of the power cylinder to operate the power piston, and by the operation of this power piston,
The clutch is disengaged, the clutch pedal is released to stop the master cylinder, the relay piston is returned to its original position, and the relay piston is separated from the relay piston to close the relay valve and the relay piston relay. In a clutch booster configured to open an internal passage formed on a surface facing a valve to discharge compressed air introduced into a pressure chamber of the power cylinder,
The internal passage of the relay piston is formed by penetrating on the axis of the relay piston, the through hole is communicated with the atmospheric pressure chamber of the power cylinder portion, and the action portion of the hydraulic fluid supplied from the master cylinder is formed as described above. It is formed on the side surface of the relay piston.

Further, according to the present invention, the master cylinder is operated by the depression operation of the clutch pedal, the relay piston is operated by the hydraulic fluid supplied from the master cylinder, and the relay valves arranged in parallel with the relay piston are operated. When released, compressed air is supplied to the pressure chamber of the power cylinder to operate the power piston, which causes the clutch to disengage and the clutch pedal to disengage the master cylinder. To return the relay piston to its original position and close the relay valve by the separating operation from the relay piston, and also to open the internal passage formed on the surface of the relay piston facing the relay valve to open the pressure of the power cylinder. In the clutch booster that discharges the compressed air introduced into the chamber A cylinder hole in which the relay piston is installed is formed by opening it in the atmospheric pressure chamber of the power cylinder portion, and a rear end portion of the relay piston is extended to form a working portion of the hydraulic fluid supplied from the master cylinder. The relay piston is formed on a side surface of the relay piston, and an internal passage of the relay piston is formed so as to penetrate the relay piston on the axis thereof, and the through hole is communicated with the atmospheric pressure chamber of the power cylinder portion.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings in which the same parts as those in FIG. 1 is a longitudinal sectional view showing a clutch booster according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a partially enlarged sectional view of FIG.

1 and 2, reference numeral 40 denotes a clutch booster. The clutch booster 40 has a control valve portion 41 which is operated by hydraulic pressure supplied from a master cylinder (not shown), and the control valve portion 41. By the operation of the power cylinder 42, the power piston 42 is operated by the compressed air supplied from the air reservoir by the operation of
It is composed of a relay means 45 for operating the output rod 44 for operating the clutch. The clutch booster 40
The power piston 42 of the power cylinder portion 43 is provided in the shell 47 provided on the side surface of the housing 46, and one end of the power piston 42 of the power cylinder portion 43 is opened into the cylinder hole 48 of the control valve portion 41.
Is provided above the housing 46, and the cylinder hole 49 of the relay means 45 is provided in the central portion of the housing 46 on the same axis as the shell 47 of the power cylinder portion 43.

The power cylinder portion 43 has a shell 47.
A power piston 42 for partitioning the inside into an atmospheric pressure chamber 11 and a pressure chamber 12, a spring 13 for urging the power piston 42 in the leftward direction in the figure when the control valve portion 41 is not operated, and a central axis of the power piston 42. It is composed of a piston rod 14 provided in the. In the pressure chamber 12,
Compressed air is supplied from the control valve unit 41 through the pipe line 24, and the atmospheric pressure chamber 11 is opened to the atmosphere through an exhaust port described later.

As shown in FIG. 3, the control valve portion 41 includes a relay piston 5 installed in a cylinder hole 48.
0 and the relay valve 51, the relay piston 50 defines the inside of the cylinder hole 48 into the variable pressure chamber 17 on the relay valve 51 side and the hydraulic chamber 16 on the rear side of the flange portion 54. The relay piston 50 has, on its outer peripheral surface, a flange portion 53 whose rear surface is locked to a step portion 52 in the cylinder hole 48 and a flange portion (acting portion) 54 on which hydraulic pressure supplied from the master cylinder acts. It is provided. On the outer peripheral surface between these flange portions 53, 54, a concave groove 55,
56 is provided, and rubber packing 34, 35 for sealing is provided in the recessed grooves 55, 56. The relay piston 50 is formed by extending the rear side of the flange portion 54, and a through hole 57 that connects the variable pressure chamber 17 and the atmospheric pressure chamber 11 of the power cylinder portion 43 on the internal axis.
Is formed. On the inner surface of the cylinder hole 48 where the rear side extension 50a of the relay piston 50 is located, the hydraulic chamber 1
6 and a sealing material 58 for sealing the power cylinder portion 43 on the atmospheric pressure chamber 11 side. As shown in FIG. 2, an exhaust port 59 for exhausting the compressed air introduced into the atmospheric pressure chamber 11 to the atmosphere is provided on the side surface of the power cylinder portion 43 in which the atmospheric pressure chamber 11 is provided. The exhaust port 59 is provided in the same direction as the axial direction of the cylinder hole 48.

The relay valve 51 arranged in parallel on the axis of the relay piston 50 is arranged so as to face the through hole 57 of the relay piston 50.
Is in contact with the valve seat 21 by the urging force of the coil spring 20 when the control valve portion 41 is in the non-operating state, and shuts off the connection between the variable pressure chamber 17 and the compressed air supply port 22. The relay piston 50 has a control valve portion 41.
In the non-operating state of, the coil spring 23 is urged in the direction away from the relay valve 51 by the urging force,
A gap is formed with the relay valve 51, the variable pressure chamber 17 and the through hole 57 are communicated with each other, and the variable pressure chamber 17 and the atmospheric pressure chamber 11 are directly connected. Reference numeral 60 denotes an internal air escape hole when the relay piston 50 is incorporated in the cylinder hole 48.

The operation of the present invention having the above configuration will be described.
When the clutch pedal is depressed, the hydraulic fluid supplied from the master cylinder is pressure-fed to the fluid chamber 28 of the relay means 45 via the input port 31 and the passage 30. This hydraulic fluid is
Through the passage 29, the hydraulic chamber 1 of the control valve unit 41
It is pumped to 6. The hydraulic pressure of the hydraulic fluid introduced into the hydraulic chamber 16 acts on the flange portion 54 to move the relay piston 50 to the right in the figure against the biasing force of the coil spring 23. The relay piston 50 contacts the wall surface of the relay valve 51, closes the through hole 57 as an internal passage, presses the relay valve 51 to separate it from the valve seat 21, and opens the relay valve 51. When the relay valve 51 is opened, the compressed air supplied from the air reservoir is supplied from the compressed air supply port 22 to the variable pressure chamber 17. The compressed air supplied to the variable pressure chamber 17 is introduced into the pressure chamber 12 of the power cylinder portion 43 through the pipe line 24, and operates the power piston 42 of the power cylinder portion 43. The power piston 42 operates rightward in the drawing against the biasing force of the spring 13 to operate the piston rod 14. The operation of the piston rod 14 operates the output rod 44 to the right through the relay piston 27, operates the clutch operating lever associated with this, and disengages the clutch. At this time, the relay piston 50 contacts the wall surface of the relay valve 51 and closes the through hole 57, so that the internal passage leading from the variable pressure chamber 17 to the atmospheric pressure chamber 11 of the power cylinder portion 43 is blocked.

Then, when the depression of the clutch pedal is stopped and returned, the hydraulic pressure in the hydraulic chamber 16 of the control valve portion 41 is reduced. Then, the relay piston 50 moves to the left in the drawing by the biasing force of the coil spring 23 and the air pressure of the variable pressure chamber 17, and separates from the relay valve 51. The relay valve 51 separates the relay piston 50,
The urging force of the coil spring 20 acts to abut the valve seat 21 and stop the compressed air supplied from the air reservoir. When the relay piston 50 separates from the relay valve 51, the through hole 57 is opened. In this way, transformer room 1
7, an internal passage communicating with the atmospheric pressure chamber 11 of the power cylinder portion 43 is formed, and the pressure chamber 12 of the power cylinder portion 43 is formed.
The compressed air supplied to the pressure cylinder 11 is introduced into the atmospheric pressure chamber 11 of the power cylinder portion 43 from the pipe line 24, the through-hole 57 through the variable pressure chamber 17. The compressed air introduced into the atmospheric pressure chamber 11 is released to the atmosphere through the exhaust port 59 provided on the side surface of the power cylinder portion 43.

As described above, when the compressed air in the variable pressure chamber 17 is exhausted, the compressed air can be instantaneously exhausted to the atmospheric pressure chamber 11 of the power cylinder portion 43 through the through hole 57, and therefore, the exhaust side packing of the relay piston 50. Since exhaust pressure does not act on 35, relay piston 5
0 does not break the balance. Therefore, pulsation does not occur in the hydraulic pressure of the master cylinder 2, so that the pedal feeling can be improved. Further, since the exhaust gas does not flow through the sliding portion of the exhaust side packing 35 of the relay piston 50, the grease of the sliding portion is not blown off by the exhaust gas, and the durability can be improved. Conventionally, it is not necessary to form the exhaust passage formed in the housing, so that the cost can be reduced. Further, since the cylinder hole 17 in which the relay piston 50 is installed can be directly opened in the atmospheric pressure chamber 11 of the power cylinder portion 43 to shorten the distance from the cylinder hole 49, the height dimension of the housing 46 can be reduced. Can be shortened to achieve miniaturization. Furthermore, since the exhaust port 59 is arranged in the same direction as the cylinder hole 17, the overall height dimension can be shortened.

[0022]

According to the clutch booster of the present invention, the following effects can be obtained. In Claim 1, the master cylinder is operated by the depression operation of the clutch pedal, the relay piston is operated by the hydraulic fluid supplied from the master cylinder, and the relay valves arranged in parallel with this relay piston are opened, Compressed air is supplied to the pressure chamber of the power cylinder to actuate the power piston.The actuation of this power piston causes the clutch to disengage, and the clutch pedal disengagement causes the master cylinder to stop and the relay piston Was returned to its original position, and the relay valve was closed by the separating operation from the relay piston, and the internal passage formed on the surface of the relay piston facing the relay valve was opened and introduced into the pressure chamber of the power cylinder. In a clutch booster that discharges compressed air, The internal passage of the piston is formed by penetrating on the axis of the relay piston, the through hole is made to communicate with the atmospheric pressure chamber of the power cylinder portion, and the working portion of the hydraulic fluid supplied from the master cylinder is made the relay piston. Since it is formed on the side surface of the relay piston, the exhaust pressure does not act on the exhaust side packing of the relay piston, so that the relay piston does not lose its balance during the exhaust operation. Therefore, pulsation does not occur in the hydraulic pressure of the master cylinder, and the pedal feeling can be improved. Since it is not necessary to provide an exhaust passage that was conventionally formed in the housing,
Since it is not necessary to process the exhaust passage, the cost can be reduced. Further, since the exhaust gas does not flow through the sliding part of the exhaust side packing of the relay piston, the grease of the sliding part is not blown off, and the durability can be improved. Furthermore, by forming a cylinder hole in which the relay piston is installed so as to open in the atmospheric pressure chamber of the power cylinder portion, the height dimension of the housing can be shortened and the size can be reduced. In Claim 2, the master cylinder is operated by the depression operation of the clutch pedal, the relay piston is operated by the hydraulic fluid supplied from the master cylinder, and the relay valves arranged in parallel with this relay piston are opened, Compressed air is supplied to the pressure chamber of the power cylinder to actuate the power piston.The actuation of this power piston causes the clutch to disengage, and the clutch pedal disengagement causes the master cylinder to stop and the relay piston Was returned to its original position, and the relay valve was closed by the separating operation from the relay piston, and the internal passage formed on the surface of the relay piston facing the relay valve was opened and introduced into the pressure chamber of the power cylinder. In a clutch booster that discharges compressed air, A cylinder hole in which a piston is installed is formed by opening it in the atmospheric pressure chamber of the power cylinder section, and a rear end portion of the relay piston is extended so that a working portion of the hydraulic fluid supplied from the master cylinder is formed in the relay piston. Since the internal passage of the relay piston is formed so as to penetrate the relay piston axial line and the through hole communicates with the atmospheric pressure chamber of the power cylinder portion, the exhaust of the relay piston Since exhaust pressure does not act on the side packing, the relay piston does not lose its balance during exhaust operation. Therefore, pulsation does not occur in the hydraulic pressure of the master cylinder, and the pedal feeling can be improved.
Since it is not necessary to provide the exhaust passage that has been conventionally formed in the housing, it is not necessary to process the exhaust passage, and the cost can be reduced. Further, since the exhaust gas does not flow through the sliding part of the exhaust side packing of the relay piston, the grease of the sliding part is not blown off, and the durability can be improved. Further, since the cylinder hole in which the relay piston is installed is opened in the atmospheric pressure chamber of the power cylinder portion, the height dimension of the housing can be shortened and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a clutch booster according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a schematic configuration diagram showing a conventional clutch operating system.

FIG. 5 is a longitudinal sectional view showing a conventional clutch booster.

[Explanation of symbols]

 11 atmospheric pressure chamber 12 pressure chamber 16 hydraulic chamber 17 variable pressure chamber 20,23 coil spring 21 valve seat 34,35 rubber packing 40 clutch booster 41 control valve section 42 power piston 43 power cylinder section 44 output rod for clutch operation 45 relay means 46 housing 47 shell 48 cylinder hole 49 cylinder hole 50 relay piston 51 relay valve 52 step portion 53 flange portion 54 flange portion (action portion) 55, 56 concave groove 57 through hole 58 sealing material 59 exhaust port

Claims (2)

[Claims] 1. A master cylinder is operated by a depression operation of a clutch pedal, a relay piston is operated by hydraulic fluid supplied from the master cylinder, and a relay valve arranged in parallel with the relay piston is opened, Compressed air is supplied to the pressure chamber of the power cylinder to actuate the power piston.The actuation of this power piston causes the clutch to disengage, and the clutch pedal disengagement causes the master cylinder to stop and the relay piston Was returned to its original position, and the relay valve was closed by the separating operation from the relay piston, and the internal passage formed on the surface of the relay piston facing the relay valve was opened and introduced into the pressure chamber of the power cylinder. In a clutch booster that discharges compressed air, The internal passage of the ton is formed by penetrating on the axis of the relay piston, the through hole is communicated with the atmospheric pressure chamber of the power cylinder portion, and the action portion of the hydraulic fluid supplied from the master cylinder is connected to the relay piston. A clutch booster characterized by being formed on a side surface of the clutch. 2. A master cylinder is operated by a depression operation of a clutch pedal, a relay piston is operated by hydraulic fluid supplied from the master cylinder, and relay valves arranged in parallel to the relay piston are opened, Compressed air is supplied to the pressure chamber of the power cylinder to actuate the power piston.The actuation of this power piston causes the clutch to disengage, and the clutch pedal disengagement causes the master cylinder to stop and the relay piston Was returned to its original position, and the relay valve was closed by the separating operation from the relay piston, and the internal passage formed on the surface of the relay piston facing the relay valve was opened and introduced into the pressure chamber of the power cylinder. In a clutch booster that discharges compressed air, A cylinder hole containing a ton is formed by opening it in the atmospheric pressure chamber of the power cylinder portion, and the rear end portion of the relay piston is extended so that the working portion of the hydraulic fluid supplied from the master cylinder is relay piston. A clutch formed on the side surface of the relay piston, the internal passage of the relay piston penetrating on the axis of the relay piston, and the through hole communicating with the atmospheric pressure chamber of the power cylinder portion. Booster.