JPH04111927U - Clutch pedal force assist device - Google Patents

Abstract

(57) [Summary] [Purpose] A clutch that can obtain a large assist force without requiring a large installation space near the clutch pedal, and can prevent clutch pedal pulsation without providing a clutch damper. To provide a pedal force assist device. [Structure] A clutch master cylinder 2 that generates fluid pressure when a clutch pedal 1 is depressed is provided, and a circuit is provided between a primary fluid pressure circuit 7a and a secondary fluid pressure circuit 7b that connect the clutch master cylinder and the clutch device 4. is provided with a power cylinder 5 that inputs the fluid pressure of the clutch master cylinder and generates release fluid pressure to engage and release the clutch device, and this power cylinder has an assist function corresponding to the fluid pressure of the clutch master cylinder. A control valve 6 is connected that generates fluid pressure and outputs this assist fluid pressure to the power cylinder in the direction of generating release fluid pressure.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a clutch pedal force assist device that reduces clutch pedal depression force. Ru.

0002

[Conventional technology]

Conventionally, as such a clutch depression force assist device, for example, NISSAN SA Service Bulletin No. 628 (Published: July 1989, Issued by: Nissan Motor Co., Ltd.) The one described on page C-2 of .

0003 This conventional clutch pedal force assist device responds to the clutch pedal's operation. A clutch booster that applies negative pressure stored in a vacuum tank is installed on a clutch pedal. Installed on the dash panel near the pedal, this reduces the force required to press the clutch pedal. The structure was designed to reduce

0004

[Problem that the idea aims to solve]

However, in such a conventional clutch pedal force assist device, the following There was a problem like that. In other words, the brake pedal installed in parallel with the clutch pedal Brake boosters may also be installed on the pedals to reduce pedal pressure. this In some cases, the brake booster and clutch booster may be installed side by side on the dash panel. Therefore, there is a limit to increasing the size of the clutch booster due to installation space. Therefore, it is not possible to obtain a large assist force.

[0005] In addition, this conventional clutch pedal force assist device also prevents cracks caused by engine vibration. Since it is not possible to prevent pulsation of the clutch pedal, the clutch operating series A clutch damper is inserted in the hydraulic circuit between the damper and the clutch master cylinder. It is necessary to

[0006] In other words, the flywheel is caused by bending of the crankshaft due to engine explosion pressure. The wheel is tilted, which causes the clutch disc connected to the flywheel and The clutch cover makes a grinding motion, and this grinding motion causes the release lever to The clutch release sleeve and the clutch release sleeve reciprocate from side to side. To pump the clutch, pulsating pressure is generated in the clutch operating cylinder. This will then be transmitted to the clutch pedal. Therefore, as a countermeasure, For example, NISSAN Service Bulletin No. 615 (Published: December 1988) As described on page C-2 of Nissan Motor Co., Ltd.), the clutch master There is a clip in the middle of the hydraulic transmission circuit that connects the cylinder and clutch operating cylinder. A latch damper is installed.

[0007] This invention was developed by focusing on the conventional problems mentioned above. Provides a large assist force while eliminating the need for a large installation space near the of the clutch pedal without providing a clutch damper. The purpose is to provide a clutch pedal force assist device that can prevent pulsation. do.

[0008]

[Means to solve the problem]

Therefore, in this invention, we developed a fluid pressure transmission system that connects the clutch master cylinder and the clutch device. A power cylinder is installed in the middle of the power circuit, and an AC power cylinder is installed in the middle of the power circuit. Achieving the above purpose by providing a control valve that outputs cyst fluid pressure. And so.

[0009] In other words, the clutch pedal force assist device of the present invention is effective when the clutch pedal is depressed. A clutch master cylinder that generates fluid pressure is provided, and this clutch In the middle of the fluid pressure transmission circuit connecting the master cylinder and the clutch device, there is a clutch Inputs the fluid pressure of the starter cylinder and generates release fluid pressure to engage and release the clutch device. A power cylinder is provided to generate the clutch mass, and the power cylinder has the clutch mass The assist fluid pressure is generated in response to the fluid pressure of the cylinder, and this assist fluid pressure is A control valve that outputs in the direction of generating release fluid pressure is connected to the power cylinder. This is a method that is being continued.

0010

[Effect]

When you depress the clutch pedal, first, the clutch master cylinder Fluid pressure is generated. This clutch master series is connected to the power cylinder. At the same time that the fluid pressure generated in the controller is input, the control valve is also The assist fluid pressure generated in response to the clutch master cylinder fluid pressure is input. The release fluid pressure is generated in the power cylinder by both fluid pressures. and, This release fluid pressure acts in a direction to release the engagement of the clutch device.

[0011] In this way, in the power cylinder, the fluid pressure generated in the clutch master cylinder In addition to this, release fluid pressure is generated in response to assist fluid pressure generated by the control valve. This reduces the force required to press the clutch pedal.

0012 Next, when you release the clutch pedal, the clutch master cylinder The generated fluid pressure decreases, and at the same time, the assist flow of the control valve increases accordingly. Body pressure also decreases. Therefore, the release fluid pressure in the power cylinder also decreases and The latch device performs a fastening operation.

[0013] Please note that assist fluid pressure may not be output from the control valve due to a malfunction or other reason. Even if the clutch master cylinder Body pressure can be generated, and the clutch device can be engaged and disengaged. Ru.

[0014] In addition, if pulse pressure occurs on the clutch device side of the hydraulic pressure transmission circuit, The interposed power cylinder allows pulse pressure to flow between the control valve side and the clutch master. It is possible to reduce pulsation on the clutch pedal side by distributing it to the star cylinder side and the clutch pedal side. This reduction in pulsation is achieved as the assist force increases.

[0015]

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0016] First, the configuration of the embodiment will be explained.

[0017] FIG. 1 is an overall view showing a clutch depression force assist device according to an embodiment of the present invention, In the figure, 1 is the clutch pedal, 2 is the clutch master cylinder, and 3 is the clutch switch. The operating cylinder, 4 is the clutch device, 5 is the power cylinder, 6 is the control Showing roll valve.

[0018] The clutch master cylinder 2 generates hydraulic pressure according to the depression force of the clutch pedal 1. A piston (not shown) is provided inside the cylinder 2a. The clutch is connected via a push rod 2b connected to the middle part of the clutch pedal 1. The pressing force of the switch pedal 1 is transmitted to the piston.

[0019] The clutch operating cylinder 3 constitutes a part of a clutch device 4. Withdrawal lever 3b for operating the engagement and release of the clutch device 4 The hydraulic pressure is transmitted from the secondary hydraulic circuit 7b constituting the fluid pressure transmission circuit. It is activated by hydraulic pressure (release fluid pressure).

[0020] The power cylinder 5 is provided in an engine room (not shown), In combination with the control valve 6, the clutch master cylinder 2 It serves to generate release fluid pressure that amplifies the generated hydraulic pressure, and is shown in Figure 3 and Figure 4 shows the details. That is, this power cylinder 5 is The inside of a has a partition wall 5b provided in the middle thereof and a slidably provided piston. 5c and 5d, the left inner assist chamber 51a, the left outer output chamber 51b, the right inner It is divided into four chambers: an assist auxiliary chamber 52a and an input chamber 52b on the outer right side, and both pistons The tons 5c and 5d are attached to connecting rods 5e that are slidably provided through the partition wall 5b. more interconnected. The input chamber 52b serves as a fluid pressure transmission circuit. It is connected to the output side of the clutch master cylinder 2 via the primary side hydraulic circuit 7a. In addition, the output chamber 51b is connected to the clutch operation via the secondary hydraulic circuit 7b. It is connected to the input side of the cylinder 3. In addition, the assist chamber 51a and the assist chamber 51a are The strike auxiliary chamber 52a is connected to the first hydraulic circuit 8a and the second hydraulic circuit 8b, respectively. It is.

[0021] Further, the control valve 6 is provided in the engine room, and the control valve 6 is provided in the engine room. Hydraulic pressure for the assist chamber 51a and the assist auxiliary chamber 52a of the power cylinder 5 This system controls the supply and discharge of cyst fluid pressure. A pump P for a power steering ring device is used. In other words, this code The control valve 6 is formed in a valve body 61, as shown in detail in FIG. A spool 63 is slidably provided in the valve hole 62. Spool back chambers 62a and 62b are formed at both left and right ends of the spool 2. And this In the spool back chamber 62a on the left side, there is a spring that biases the spool 63 in the right direction in the figure. A right spool back chamber 62b is connected to a branch circuit 7c and a primary hydraulic pressure It is connected to the output side of the clutch master cylinder 2 via the circuit 7a.

[0022] In addition, the valve hole 62 includes a drain port 62c and a first outlet port in order from the right in the figure. A power port 62d and a second output port 62e are formed, and the drain port 62c is connected to the drain circuit 9, and the first output port 62d is connected to the first hydraulic pressure. The circuit 8a and the hydraulic pressure supply circuit 10 are connected, and the second output port 62e has a second hydraulic circuit connected thereto. paths 8b are connected to each other. Incidentally, the drain circuit 9 is a reservoir tank T. It is connected to atmospheric pressure. Further, the hydraulic pressure supply circuit 10 includes a pump. Hydraulic pressure is supplied from P.

[0023] The spool 63 is provided in an underlapping state at the first output port 62d. A constriction land 63a forming a constriction s between the valve hole 62 and the drain port. A defining land 63b defining a space between the port 62c and the first output port 62d, and an end portion Between the lands 63c and 63d and the second output port 62e and drain port 62c A communication path 63e is formed that allows constant communication between the two. And, as shown in Figure 2 and Figure 3. As shown, the spool 63 slid to the right in the figure due to the biasing force of the spring 64. In the neutral state, the opening degree of the aperture s by the first output port 62d is large and both output ports are The ports 62d and 62e are connected to the drain circuit 9 side and are in a low pressure state, and conversely, the spout If the spool 63 slides to the left in the figure against the biasing force of the ring 64 (see Figure 4) (see), the throttle s is narrowed and the output oil pressure of the first hydraulic circuit 8a is increased. ing.

[0024] Next, the operation of the embodiment will be explained.

[0025] (B) When operating the clutch When clutch pedal 1 is depressed, hydraulic pressure is generated in clutch master cylinder 2, This oil pressure enters the input chamber 52b of the power cylinder 5 via the primary side hydraulic circuit 7a. At the same time, the control is transmitted via the primary side hydraulic circuit 7a and the branch circuit 7c. It is also transmitted to the right spool back chamber 62b of the control valve 6.

[0026] In the control valve 6, the hydraulic pressure in the right spool back chamber 62b increases. As a result, the spool 63 slides to the left in the figure against the biasing force of the spring 64. As a result, the orifice s is narrowed, and the high pressure oil supplied from the hydraulic supply circuit 10 is 4, as shown by the solid arrow, the first hydraulic circuit 8 is connected from the first output port 62d to the first hydraulic circuit 8. is supplied into the assist chamber 51a of the power cylinder 5 via the The oil in the auxiliary chamber 52a is drained from the second hydraulic circuit 8b as indicated by the broken line arrow in the figure. from the reservoir via the first output port 62d, the communication path 63e and the drain circuit 9. This is discharged into the tank T, and the difference between the two chambers 51a and 52a created in this way The pressure generates an assist force that pushes and slides both pistons 5c and 5d to the left in the figure. do. By the way, the amount of movement of the spool 63 is input from the clutch master cylinder 2. Therefore, the assist force is also proportional to this oil pressure. It becomes.

[0027] Therefore, in the power cylinder 5, the clutch mass input to the input chamber 52b is Assist force obtained by the oil pressure of the cylinder 2 and the control valve 6 mentioned above. As a result, both pistons 5c and 5d slide to the left in the figure, and the hydraulic pressure (removal) in the output chamber 51b is reduced. This hydraulic pressure is used to operate the clutch via the secondary hydraulic circuit 7b. The rating cylinder 3 is operated to release the clutch device 4 from engagement. This way The clutch master series is controlled based on the oil pressure controlled by the control valve 6. The depression force on the clutch pedal 1 is reduced by a large assist force corresponding to the hydraulic pressure generated by the engine 2. Reduced.

[0028] In addition, if the pump P for the power steering ring stops working, the hydraulic Since the supply circuit 10 side has the same pressure (atmospheric pressure) as the drain circuit 9, the power The assist chamber 51a and the assist auxiliary chamber 52a of the driver 5 are in the same pressure state, and Therefore, there is no assisting force for both pistons 5c and 5d. In this case, the power The cylinder 5 is operated by both pistons using only the hydraulic force generated by the clutch master cylinder 2. 5c and 5d move to increase the oil pressure in the output chamber 51b, which causes The clutch device 4 can be disengaged.

[0029] Additionally, the crankshaft bends due to the engine's explosion pressure, causing a crack. If pulse pressure occurs in the operating cylinder 3, this pulse pressure will be applied to the power cylinder. However, both pistons 5c and 5d are transmitted to the output chamber 51b of the controller 5. The assist chamber 51a receives the high hydraulic pressure output from the oil valve 6 to provide a strong assist force. is in effect, the generation of pulsation in both pistons 5c and 5d is suppressed, and this , the clutch master cylinder is connected via the input chamber 52b and the primary hydraulic circuit 7a. This prevents pulse pressure from being transmitted to 2. Therefore, there is pulsation in the clutch pedal 1. This can be prevented or suppressed from occurring.

[0030] (b) When clutch operation is released When the clutch pedal 1 is released, the oil in the clutch master cylinder 2 As the pressure decreases, the inside of the right outer chamber 52b of the power cylinder 5 and the control Hydraulic pressure in the right spool back chamber 62b of the roll valve 6 (assist fluid pressure) decreases.

[0031] Due to this oil pressure drop, the biasing force of the spring 64 is increased on the control valve 6 side. The spool 63 is pushed back to the right in the figure, the aperture s widens, and the power cylinder Both the first and second oils connected to the assist chamber 51a and the assist auxiliary chamber 52a of the da. The pressure circuits 8a and 8b are both connected to the drain circuit 9 via the communication path 63e, so that the low pressure As a result, the assist force acting on both pistons 5c and 5d decreases.

[0032] On the other hand, on the power cylinder 5 side, the oil pressure in the input chamber 52b decreases, Due to the decrease in the assist force mentioned above, both pistons 5c and 5d slide to the right in the figure, and the output chamber 51b oil pressure (assist fluid pressure) decreases, and as a result, the clutch device 4 is engaged. do.

[0033] As explained above, in the clutch depression force assist device of the embodiment, the pump Based on the high hydraulic pressure supplied from P, a large assist force can be obtained. Thereby, the pressing force on the clutch pedal 1 can be greatly reduced. Also, this The power cylinder 5 and control valve 6 for reducing the pedaling force are as follows: Since it is not necessary to install the brake pedal near the clutch pedal 1, the brake pedal (not shown) Even if a mechanism is provided to reduce the pedal effort, there will be space constraints for this mechanism. It is easy to install in parallel with this mechanism.

[0034] In addition, even if pump P fails, the hydraulic pressure generated in clutch master cylinder 2 Since the clutch device 4 can be disengaged with just a hand, it has excellent safety. Ru.

[0035] In addition, pulse pressure is generated in the clutch operating cylinder 3 on the clutch device 4 side. Even if this occurs, the vibrations of both pistons 5c and 5d are damped by the action of the strong assist force. In other words, the pulse pressure on the clutch operating cylinder 3 side is In the cylinder 6, it is distributed between the control valve 6 side and the clutch master cylinder 2 side. In this case, the distribution ratio to the side with high oil pressure increases, so the assist force becomes large. The larger the torque is, the more the transmission to the clutch master cylinder 2 is suppressed. For this reason, To prevent pulsation of clutch pedal 1 without providing a separate pulsation prevention mechanism It has the characteristic of being able to

[0036] Above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is as follows. Not limited to examples, design changes, etc. within the scope of the gist of the present invention, etc. Even if there is, it is included in this invention. For example, in the example, hydraulic pressure was used as the fluid pressure. However, it is also possible to use other liquids or gases. In addition, the structure of the control valve generates assist fluid pressure according to the fluid pressure generated in the clutch master cylinder. It is not limited to the structure shown in the embodiment as long as the structure allows Also, The power cylinder also handles the fluid pressure generated in the clutch master cylinder and the control valve. If the structure generates release fluid pressure using the assist fluid pressure generated by the lubricant, it is possible to The structure is not limited to the one shown in the example. For example, adding a bulkhead to the cylinder The assist fluid pressure is introduced into this chamber, and the assist fluid is A structure may be adopted in which a piston that receives only pressure and slides is added.

[0037]

[Effect of the idea]

As explained above, in the clutch depression force assist device of the present invention, A power system is installed in the middle of the fluid pressure transmission circuit connecting the latch master cylinder and the clutch device. A cylinder is provided, and assist fluid pressure is output to this power cylinder. Since it is equipped with a control valve, it is not supplied from the control valve. Based on the high assist fluid pressure, a large assist force can be obtained. It is possible to greatly reduce the force required to press the clutch pedal. In addition, a power cylinder and control valve are installed to reduce the force required to press the clutch pedal. The brake booster does not need to be placed near the clutch pedal, so the brake booster The effect is that there is no space restriction on the installation. and, If pulsation occurs on the clutch device side of the fluid pressure transmission circuit, remove the The power cylinder that is connected causes pulse pressure to flow between the control valve side and the clutch master. It is distributed between the cylinder side and the clutch pedal side, reducing pulsation on the clutch pedal side. Eliminates the need for a separate configuration to prevent pulsation, simplifying the configuration and reducing costs. It is possible to reduce the In addition, even if the control valve fails, it will not cause a crash. It is possible to tighten and unfasten the locking device, and it has the effect of providing excellent safety. It will be done.

[Brief explanation of drawings]

FIG. 1 is an overall view showing a clutch depression force assist device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing details of a control valve in the embodiment device.

FIG. 3 is an explanatory diagram of the operation of the embodiment device in a state where the clutch pedal is not depressed.

FIG. 4 is an explanatory diagram of the operation of the embodiment device when the clutch pedal is depressed.

[Explanation of symbols]

1 Clutch device 2 Clutch master cylinder 4 Clutch device 5 Power cylinder 6 Control valve 7a Primary side hydraulic circuit (fluid pressure transmission circuit) 7b Secondary side hydraulic circuit (fluid pressure transmission circuit)

Claims (1)

[Scope of utility model registration request] [Claim 1] A clutch master cylinder is provided that generates fluid pressure when a clutch pedal is depressed, and a fluid pressure transmission circuit that connects the clutch master cylinder and a clutch device is provided with a fluid pressure transmission circuit that inputs the fluid pressure of the clutch master cylinder. A power cylinder is provided that generates release fluid pressure to engage and release the clutch device, and this power cylinder generates assist fluid pressure corresponding to the fluid pressure of the clutch master cylinder, and uses this assist fluid pressure to power the clutch device. A clutch depression force assist device characterized in that a control valve is connected to a cylinder to output an output in a direction of generating release fluid pressure.