JP2006242310A - Actuator of clutch mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuator of a clutch mechanism capable of releasing a function without leaking working liquid in an emergency case. <P>SOLUTION: This actuator 18 provided with an actuator piston 14 advancing into and retracting from a piston case 13 and provided with a usual use flow passage 17 for feeding liquid pressure into equipment to be operated from a pressure chamber 15 between a tip face of the piston 14 and an internal wall face in an end part of the case 13 in the piston case 13 is provided with a liquid pressure release flow passage 21 connecting the usual use flow passage 17 with a reservoir tank 28 and having a plug 20 as an opening and closing means in the halfway section. To explain concretely, a tapered section whose inside diameter is gradually reduced as a usual use flow passage connection section of the liquid pressure release flow passage 21 is formed in a holder 19 provided in the piston case 13, and the plug 20 whose tip section is formed into a conical shape is screw-fitted into the liquid pressure release flow passage 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an actuator for a clutch mechanism.

  In recent years, instead of manual transmissions where the driver himself performs clutch operation and shift operation, a mechanical automatic transmission equipped with an actuator that engages and disengages the clutch and an actuator for shifting the gear position has been adopted in the power transmission system, and the effort of the driver There are an increasing number of vehicles designed to reduce this.

  3 and 4 show an example of a clutch mechanism incorporated in a mechanical automatic transmission. A clutch pedal 1 for executing a clutch operation by a driver, and a hydraulic pressure is generated by a depression operation of the clutch pedal 1. A master cylinder 2, an actuator 4 that is driven by a motor 3 to generate a hydraulic pressure, a clutch booster 6 that can release a clutch via a lever 5 by air pressure when the hydraulic pressure is received, the master cylinder 2, Alternatively, it is provided with a cylinder 7 that transmits the hydraulic pressure to the clutch booster 6 when the hydraulic pressure is received from the actuator 4 for the clutch disengagement operation (see, for example, Patent Document 1).

  The actuator 4 includes a worm 8 that is rotated by the motor 3, a sector gear-shaped worm wheel 10 that meshes with the worm 8 and has a crank 9, a base end portion pivotally supported by the crank 9, and the rotation of the worm wheel 10. A push rod 11 pushed and pulled along with the worm 8, the worm wheel 10, and a housing 12 that houses the push rod 11, and a piston case 13 that is connected to the housing 12 and into which the tip portion of the push rod 11 enters and exits. An actuator piston 14 having a base end portion pushed into the opposite side of the housing 12 by the push rod 11 in the piston case 13, and a pressure between the distal end surface of the actuator piston 14 and the inner wall surface of the end of the piston case 13 Intervening in the chamber 15 and push lock Is constituted by a spring 16 for urging the actuator piston 14 towards the 11 side, the tip portion of the piston case 13, the channel 17 are drilled.

  That is, when the push rod 11 advances toward the tip end side of the piston case 13 as the motor 3 rotates, the volume of the pressure chamber 15 is reduced by the movement of the actuator piston 14, and hydraulic pressure is applied from the flow path 17 to the cylinder 7. The clutch is disengaged.

  On the contrary, when the push rod 11 is retracted toward the base end side of the piston case 13, the spring 16 pushes back the actuator piston 14, so that the volume of the pressure chamber 15 is expanded and no hydraulic pressure is applied to the cylinder 7. The clutch returns to the engaged state.

  In this clutch mechanism, normally, the motor 3 is moved based on a command from the control unit to connect and disconnect the clutch.

Further, when a malfunction occurs in the motor 3 or the like, the master cylinder that operates by depressing the clutch pedal 1 by removing the clutch fluid between the pressure chamber 15 and the cylinder 7 and releasing the function of the actuator 4. The hydraulic pressure from 2 is applied to the cylinder 7.
JP 2004-270818 A

  As a working fluid of the clutch mechanism, a clutch liquid in which a rust preventive agent is blended with a non-mineral oil-based synthetic oil is used. For example, when the motor 3 fails, the clutch is removed when switching to the operation by the driver. When the liquid is applied to the vehicle body or equipment, the coating film peels off or cracks appear in the coating film.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an actuator of a clutch mechanism that can release a function without leaking a working liquid in an emergency.

  In order to achieve the above object, the present invention comprises a piston in a piston case that moves forward and backward by the rotation of a motor, and hydraulic pressure is transferred from a pressure chamber between the piston front end surface and the case end inner wall surface to an operation target device. In the actuator of the clutch mechanism in which the normal flow path for imparting the pressure is formed in the piston case, the normal flow path is connected to the reservoir tank, and a hydraulic pressure release flow path having an opening / closing means is provided in the middle thereof.

  More specifically, a common flow passage connecting portion of the hydraulic pressure release flow passage is formed in the piston case, a switching plug as an opening / closing means is connected to the flow passage connecting portion, and the normal flow passage communicates with the hydraulic pressure release flow passage. In such a state, it is screwed so that it can be positioned either in a state in which it is not in use or in a state in which the service channel is in communication with the hydraulic pressure release channel.

  Furthermore, the regular flow passage connecting portion of the hydraulic pressure release flow passage is formed in a tapered shape with the inner diameter gradually decreasing toward the pressure chamber, and the tip of the switching plug is tapered to match the tapered flow passage connecting portion. To form.

  In the present invention, the opening / closing means in the middle of the hydraulic pressure release flow path is opened, the pressure chamber and the regular flow path attached thereto are communicated with the reservoir tank, and the function of the actuator is released.

  According to the actuator of the clutch mechanism of the present invention, the following excellent effects can be obtained.

  (1) When the opening / closing means is opened, the pressure chamber and the service channel attached to the pressure chamber communicate with the reservoir tank via the fluid pressure release channel. This prevents the paint film from peeling off or cracking of the car body or equipment.

  (2) The actuator function can be released with a simple structure by screwing a switching plug as an opening / closing means into a regular flow path connecting portion of the hydraulic pressure release path formed in the piston case.

  (3) The function of the actuator is not released if the internal diameter of the regular flow passage connecting portion of the hydraulic pressure release flow passage is tapered toward the pressure chamber and the tip of the switching plug is tapered to match the internal diameter. Sometimes the hydraulic pressure does not escape to the reservoir tank, so that it can be effectively applied to the device to be operated.

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

  1 and 2 show an example of an embodiment of an actuator of a clutch mechanism of the present invention. In the figure, the same reference numerals as those in FIGS. 3 and 4 denote the same components.

  The actuator 18 is composed of the motor 3, the worm 8, the worm wheel 10, the push rod 11, the housing 12, the piston case 13, the actuator piston 14 and the like in substantially the same manner as the actuator 4 described above. The holder 19 is provided integrally with the portion.

  The holder 19 is provided with a fluid pressure release passage 21 that can be screwed into the actuator piston 14 and that is continuous with the passage (ordinary passage) 17.

  The hydraulic pressure release flow path 21 is arranged in order from the end face of the holder 19 toward the flow path 17, and has a large inner diameter portion 22, a female screw portion 23, an inner diameter portion 24, and a tapered portion 25 whose inner diameter gradually decreases toward the flow path 17. And a small inner diameter portion 26 and a connection portion 29 communicating from the medium inner diameter portion 24 through the tube 27 to the reservoir tank 28.

  The plug 20 includes a base end portion 31 fitted with an annular seal member 30 that can be inscribed in the large inner diameter portion 22, a male screw portion 32 that is screwed into the female screw portion 23, and a tapered portion of the hydraulic pressure release channel 21. 25 has a tip portion 33 formed with a conical taper surface that can be in close contact with 25.

  In normal times when the motor 3 is moved to engage and disengage the clutch, the plug 20 is strongly tightened to the holder 19 so that the tip portion 33 is in close contact with the tapered portion 25 of the hydraulic pressure release passage 21.

  As a result, the state in which the pressure chamber 15 does not communicate with the hydraulic pressure release channel 21 via the channel 17 is maintained, and the hydraulic pressure does not escape from the pressure chamber 15 to the reservoir tank 28, and the actuator piston 14 reciprocates. The clutch is connected or disconnected.

  When the motor 3 fails, the plug 20 is loosened from the holder 19 so that the tip portion 33 is separated from the tapered portion 25 of the hydraulic pressure release passage 21.

  As a result, the pressure chamber 15 is switched to a state in which the pressure chamber 15 communicates with the reservoir tank 28 via the flow path 17 and the hydraulic pressure release flow path 21, the function of the actuator 18 is released, and the clutch is disconnected and connected by depression of the clutch pedal 1. It becomes possible.

  At this time, since the seal member 30 fitted to the proximal end portion 31 of the plug 20 is inscribed in the large inner diameter portion 22 of the hydraulic pressure release passage 21, the clutch fluid does not flow outside, Prevents the peeling of the coating film on the device or the appearance of cracks in the coating film.

  It should be noted that the actuator of the clutch mechanism of the present invention is not particularly limited only to the above-described embodiment, and it goes without saying that modifications can be made without departing from the scope of the present invention.

  The actuator of the clutch mechanism of the present invention can be applied to various vehicle types.

It is a conceptual diagram which shows an example of embodiment of the actuator of the clutch mechanism of this invention. FIG. 2 is an enlarged view of a holder and a plug related to FIG. 1. It is a conceptual diagram which shows an example of the clutch mechanism used for a mechanical automatic transmission. FIG. 4 is a conceptual diagram of an actuator related to FIG. 3.

Explanation of symbols

3 Motor 13 Piston case 14 Actuator piston 15 Pressure chamber 17 Flow path (ordinary flow path)
20 plug (opening / closing means / switching plug)
21 Fluid pressure release channel 25 Tapered part (ordinary channel connection part of fluid pressure release channel)
28 Reservoir tank 33 Tip part

Claims (3)

  The piston case has a piston that moves forward and backward by the rotation of the motor, and a normal flow path that applies hydraulic pressure to the device to be operated from the pressure chamber between the piston front end surface and the case end inner wall surface. An actuator for a clutch mechanism, characterized in that, in the actuator for a clutch mechanism, a hydraulic pressure release passage having an opening / closing means is provided in the middle of connecting the common passage to a reservoir tank.   A normal flow passage connecting portion of the hydraulic pressure release flow passage is drilled in the piston case, and a switching plug as an opening / closing means is connected to the flow passage connecting portion in a state where the normal flow passage does not communicate with the hydraulic pressure release flow passage or the normal flow The actuator of the clutch mechanism according to claim 1, wherein the actuator is screwed so that the path can be located in any of the states communicating with the hydraulic pressure release flow path.   The regular flow passage connecting portion of the hydraulic pressure release flow passage is formed in a tapered shape with the inner diameter gradually decreasing toward the pressure chamber, and the tip portion of the switching plug is formed in a tapered shape so as to match the tapered flow passage connecting portion. The actuator of the clutch mechanism according to claim 2.

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