JP2007071250A - Clutch booster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch booster capable of reducing manufacturing cost and controlling a relay piston satisfactorily. <P>SOLUTION: This clutch booster for introducing air through a poppet valve 16 by operation of the relay piston 14 to push a power piston 6 in by assist of air is provided with a motor driving part 28 for operating the relay piston 14 through driving mechanisms 32, 33, 35 by a motor 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a clutch booster for connecting and disconnecting a clutch.

  FIG. 6 shows an example of a conventional clutch booster employed in a large vehicle such as a large truck. The clutch booster is a power cylinder portion 1 connected to a release lever (not shown) so as to connect and disconnect the clutch. And a relay piston portion 2 that assists the operation of the power cylinder portion 1 and a housing 3 in which the power cylinder portion 1 and the relay piston portion 2 are arranged.

  The power cylinder portion 1 includes a power piston 6 that partitions the internal space 4 of the housing 3 and is surplused by a spring 5, a piston rod 7 that is fixed to the power piston 6 and positioned in the cylinder case 3 a of the housing 3, and a piston A free piston 8 and a relay piston 9 that are fitted on the rod 7 and define the inside of the cylinder case 3a are provided. Here, a first oil chamber 10 is formed at one end of the free piston 8, and an intermediate chamber 12 in which a spring 11 is arranged is formed between the other end of the free piston 8 and the relay piston 9. .

  The relay piston part 2 is slidably arranged in the piston hole 13 of the housing 3 so as to be formed at a position adjacent to the power cylinder part 1, and the relay piston 14 is operated with respect to the valve seat 15. And a poppet valve 16 that contacts or separates. Here, one end side (opposite relay piston side) of the poppet valve 16 is provided with a communication channel 17 connected to an air tank (not shown), and one end side (anti-poppet valve 16 side) of the relay piston 14 is provided. Forms a second oil chamber 18 and has an intermediate chamber 20 in which a spring 19 is arranged on the other end side (poppet valve 16 side) of the relay piston 14.

  The housing 3 is provided with an input port 21 connected to the master cylinder, and allows hydraulic oil from the master cylinder to be led into and out of the first oil chamber 10 of the power cylinder portion 1 and the second oil chamber 18 of the relay piston portion 2. A hydraulic flow path 22 is formed. In addition, compressed air is introduced into the housing 3 from the air tank (not shown) to the rear side of the power piston 6 in the internal space 4 through the communication channel 17 and the intermediate chamber 20 by the operation of the relay piston 14 and the poppet valve 16. A possible first air flow path 23 and a pipe (not shown) are connected (in the figure, the reference sign A indicates that the first air flow path 23 leads to the internal space 4 of the housing 3). Further, the housing 3 is formed with a second air flow path 24 that communicates from the midway position of the relay piston 14 to the front side of the power piston 6 in the internal space 4, and the first air flow path 23 and the second air flow path are formed. 24 is communicable by an internal flow path 25 formed in the relay piston 14. In the figure, 26 is an exhaust valve for exhausting air, and 27 is an outer cup of the free piston 8.

  Further, the clutch booster is supplied with control means (not shown) that receives a command from the driver, an electromagnetic valve (not shown) that is switched by a control signal from the control means, and compressed air by opening the electromagnetic valve. A check valve (not shown) and an air tank (not shown) are provided to flow into the rear side of the power piston 6 in the internal space 4 of the housing 3.

  In a manual operation, when the driver depresses a clutch pedal (not shown) to disengage the clutch, hydraulic oil is supplied from the master cylinder via the hydraulic flow path 22 to the first oil chamber 10 and the second oil. The relay piston 14 is slid to the right side in the figure by the hydraulic pressure in the second oil chamber 18, and the poppet valve 16 is pushed to the right side to relay the intermediate chamber 20 and the communication channel 17. And the compressed air from the air tank (not shown) via the communication flow path 17, the intermediate chamber 20, the first air flow path 23, and the piping (not shown), the power piston in the internal space 4 of the housing 3. 6 Inflow to the rear side, push the power piston 6 to the right in the figure with the assistance of compressed air, push the release lever (not shown) through the piston rod 7, and turn the clutch "disengaged" That.

  Further, when the driver returns the clutch pedal (not shown) to “engage” the clutch, the hydraulic oil is supplied from the master cylinder via the hydraulic flow path 22 to the first oil chamber 10 and the second oil chamber 18. In the relay piston portion 2, the relay piston 14 and the poppet valve 16 are returned to the left side in the drawing by the restoring force of the spring 19, and the communication between the intermediate chamber 20 and the communication flow path 17 is closed. Compressed air on the rear side of the power piston 6 is connected to the internal space of the housing 3 via a pipe (not shown), the first air flow path 23, the intermediate chamber 20, the internal flow path 25, and the second air flow path 24. 4, the power piston 6 is made to retreat to the left side in the drawing, the release lever (not shown) is returned via the piston rod 7, and the clutch is "contacted".

  On the other hand, when the clutch is disengaged by automatic control, compressed air from an air tank (not shown) is opened by opening a solenoid valve (not shown) in response to a command from a control means (not shown). Through a check valve (not shown) to the rear side of the power piston 6 in the internal space 4 of the housing 3, the power piston 6 is pushed to the right side in the figure by compressed air, and a release lever ( (Not shown) and the clutch is disengaged. When the clutch is “contacted” by automatic control, the compressed air on the rear side of the power piston 6 in the inner space 4 of the housing 3 is forwarded to the front of the power piston 6 in the inner space 4 of the housing 3 via a pipe or the like. The power piston 6 is retracted to its original position, the release lever (not shown) is returned via the piston rod 7, and the clutch is "contacted".

As prior art documents related to the structure of the clutch booster, there are the following Patent Documents 1 and 2.
JP 2004-270723 A JP 2005-98372 A

  However, in such a clutch booster, when the relay piston 14 is hydraulically actuated, the piston rod 7 of the power cylinder unit 1 is also actuated via the hydraulic flow path 22, so that a large hydraulic pressure is necessary as a whole. However, there is a problem that the manufacturing cost increases due to the increase in size and complexity. Further, in the automatic control of the clutch, there is a problem that the relay piston 14 cannot be suitably operated because the controllability of the electromagnetic valve is not good.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a clutch booster that suitably operates a relay piston while reducing manufacturing costs.

  The present invention is a clutch booster that introduces air through a poppet valve by operation of a relay piston and pushes in a power piston by assisting with air, and includes a motor drive unit that operates the relay piston by a motor through a drive mechanism. The present invention relates to a clutch booster that is provided.

  In the present invention, the motor drive unit includes a motor for receiving a signal, a gear mechanism connected to the motor, a linear motion mechanism connected to the gear mechanism, and a hydraulic cylinder operated by the linear motion mechanism, The relay piston is preferably arranged to operate via a hydraulic flow path by the operation of the hydraulic cylinder.

  In the present invention, the motor drive unit includes a motor that receives a signal, a gear mechanism connected to the motor, and a linear motion mechanism connected to the gear mechanism, and the relay piston is driven by the linear motion mechanism. It is preferably arranged to operate.

  In the present invention, it is preferable to include control means for giving a signal to the motor of the motor drive unit.

  Thus, according to the present invention, the relay piston is operated by the motor and the drive mechanism of the motor drive unit, so that a large hydraulic pressure is not required, the configuration is simplified, and the manufacturing cost can be reduced. Further, since the motor and the drive mechanism of the motor drive unit finely control the relay piston, the relay piston can be suitably operated.

  The motor drive unit includes a motor for receiving a signal, a gear mechanism connected to the motor, a linear motion mechanism connected to the gear mechanism, and a hydraulic cylinder operated by the linear motion mechanism. When the hydraulic cylinder is operated so as to be operated via the hydraulic flow path, the relay piston is operated via the hydraulic pressure of the hydraulic flow path, so that the relay piston is more finely controlled and the relay piston is preferably operated. Can be made.

  The motor drive unit includes a motor for receiving a signal, a gear mechanism connected to the motor, and a linear motion mechanism connected to the gear mechanism, and the relay piston is arranged to operate by driving the linear motion mechanism. If it does, the structure which act | operates a relay piston via oil_pressure | hydraulic becomes unnecessary, Therefore A manufacturing cost can be reduced.

  When the control means for giving a signal to the motor of the motor drive unit is provided, the relay piston is finely controlled by the control means via the motor, so that the relay piston can be operated more suitably.

  According to the above-described clutch booster of the present invention, it is possible to achieve various excellent effects that the manufacturing cost can be reduced and the relay piston can be suitably operated.

  A first example of an embodiment of the present invention will be described below with reference to the drawings.

  1 to 3 show a first example of an embodiment for carrying out the present invention, and the portions denoted by the same reference numerals as those in FIG. 6 represent the same items.

  The clutch booster of the first example is a motor drive unit 28 adjacent to the housing 3 of the power cylinder unit 1, a control means (ECU) 29 for giving a command to the motor drive unit 28, and a hydraulic oil to the motor drive unit 28. A reservoir tank 30, and a motor drive unit 28 receives a control signal from the control means 29, a gear mechanism (drive mechanism) 32 such as a reduction gear 32 a connected to the motor 31, A linear motion mechanism (drive mechanism) 33 of a feed screw 33a that can be moved back and forth in conjunction with the gear mechanism 32, a motor side housing 34 in which the motor 31, the gear mechanism 32, and the linear motion mechanism 33 are disposed, and a motor side housing 34 And a hydraulic cylinder (driving mechanism) 35 arranged to be continuous.

  The hydraulic cylinder 35 includes a cylinder case 36, a piston 37 that comes into contact with the feed screw 33 a of the linear motion mechanism 33 in the cylinder case 36, and a center valve 38 that is located inside the tip end side (reverse feed screw side) in the cylinder case 36. And a connecting pipe 39 that is movably disposed in the axial hole 37a of the piston 37 and connects the piston 37 and the center valve 38. An intermediate oil is provided between the piston 37 and the center valve 38 in the cylinder case 36. A chamber 40 is formed, and a spring 41 is disposed in the intermediate oil chamber 40 to bias the piston 37 toward the feed screw 33a.

  The hydraulic cylinder 35 is connected to a motor-side hydraulic flow path 42 communicating from the intermediate oil chamber 40 in the cylinder case 36 to the hydraulic flow path 22 of the housing 3, and from the reservoir tank 30 through the center valve 38. A reservoir tank flow path 43 that can replenish hydraulic oil to the intermediate oil chamber 40 is connected. Here, the center valve 38 is provided with a valve body 38 a for preventing leakage of hydraulic oil from the reservoir tank 30, and replenishment of hydraulic oil from the center valve 38 to the intermediate oil chamber 40 is connected depending on the position of the piston 37. The valve body 38a is moved through the pipe 39 so that the replenishment flow path is communicated.

  Hereinafter, the operation of the first example of the embodiment of the present invention will be described.

  When the clutch is disengaged, as shown in the flow of FIG. 3, a control signal is input to the motor 31 from the control means 29 in accordance with the operation of the driver (step S1). 31 is driven (step S2), the gear mechanism 32 such as the reduction gear 32a is rotated, the linear motion mechanism 33 of the feed screw 33a is advanced, and the hydraulic pressure is applied via the movement of the piston 37 (right direction in FIGS. 1 and 2). The hydraulic pressure is generated in the intermediate oil chamber 40 of the cylinder 35 (step S3), and the hydraulic oil is supplied to the first oil chamber 10 of the power cylinder section 1 through the hydraulic flow path 42 on the motor 31 side and the hydraulic flow path 22 of the housing 3. The relay piston 14 is supplied to the second oil chamber 18 of the relay piston portion 2 and slid to the right side in the drawing (step S4). In the relay piston portion 2, the poppet valve 16 is pushed to the right side in the drawing to be intermediate 20, the communication channel 17 is communicated, and compressed air is supplied from the air tank (not shown) to the housing 3 via the communication channel 17, the intermediate chamber 20, the first air channel 23, and a pipe (not shown). It flows into the rear side of the power piston 6 in the internal space 4 (step S5), pushes the power piston 6 to the right side in the figure with the assistance of compressed air, pushes a release lever (not shown) through the piston rod 7, and clutches Is set to “OFF” (step S6).

  Here, the operation of “disengagement” of the clutch may be manual operation or automatic control. In the case of manual operation, the hydraulic oil is supplied to the first oil through the hydraulic flow path 22 by the master cylinder, as in the conventional example. The chamber 10 and the second oil chamber 18 are reached. Further, the outer cup 44 arranged around the piston rod 7 has a sliding resistance larger than the control hydraulic pressure, so that the operation of the pedal clutch (not shown) and the automatic control by the motor 31 can be used together. ing. Further, the center valve 38 in the hydraulic cylinder 35 moves in the same direction as the piston 37 moves (rightward in FIGS. 1 and 2), closes the valve body 38a, and the reservoir tank channel 43 from the reservoir tank 30. Is closed.

  When the clutch is set to “contact”, as shown in the flow of FIG. 3, a control signal is output from the control means 29 to the motor 31 in accordance with the operation of the driver (step S7). 31 is driven (step S8), the gear mechanism 32 such as the reduction gear 32a is rotated in the reverse direction, and the linear movement mechanism 33 of the feed screw 33a is moved backward to move the piston 37 (to the left in FIGS. 1 and 2). The hydraulic pressure in the intermediate oil chamber 40 of the hydraulic cylinder 35 is reduced (step S9), and the hydraulic oil is supplied from the first oil chamber 10 and the second oil chamber 18 to the hydraulic flow path 22 of the housing 3 and the hydraulic flow path 42 on the motor side. Then, the relay piston 14 is slid to the left in the drawing (step S10). In the relay piston portion 2, the relay piston 14 and the poppet valve 16 are driven by the restoring force of the spring 19. Returning to the left side in the figure, the communication between the intermediate chamber 20 on the air tank side and the communication flow path 17 is closed, and the compressed air on the rear side of the power piston 6 in the internal space 4 of the housing 3 is released (step S11). Is moved back to the original position, the release lever (not shown) is returned via the piston rod 7, and the clutch is brought into "contact" (step S12).

  Here, the operation of “contacting” the clutch may be manual operation or automatic control. In the case of manual operation, the hydraulic oil is supplied to the first oil through the hydraulic flow path 22 by the master cylinder, as in the conventional example. The chamber 10 and the second oil chamber 18 are sucked. Further, in the center valve 38 in the hydraulic cylinder 35, when the hydraulic oil is returned to the intermediate oil chamber 40 as the piston 37 moves, the valve body 38a is opened and the reservoir tank flow path 43 from the reservoir tank 30 is communicated. The hydraulic oil is replenished from the reservoir tank 30 or the residual pressure is released.

  When the clutch is "disengaged" or "contacted", the position of the stroke is determined by the control means 29, and in the operation in the "disengaged" direction of the clutch (step S6) as shown in the flow of FIG. Is less than the target value, the drive stage of the relay piston 14 and the motor drive unit 28 is returned to the stage of inputting a control signal to the motor 31 from the control means 29 (step S1). The clutch is further operated in the “disengagement” direction via the clutch, and when the stroke exceeds the target value in the operation in the “disengagement” direction of the clutch (step S6), the relay piston 14 and the motor drive unit 28 are operated. Is shifted to a step of inputting a control signal from the control means 29 to the motor 31 in the operation in the “contact” direction of the clutch (step S7). Through the driving parts 28 actuates the clutch in the "contact" direction, and adjust the stroke.

  On the other hand, as shown in the flow of FIG. 3, in the operation of the clutch in the “contact” direction (step S12), when the stroke is less than the target value, the drive stage of the relay piston 14 and the motor drive unit 28 is controlled by the control means. 29, the control signal is returned to the step of inputting the control signal to the motor 31 (step S7), and the clutch is further operated in the “contact” direction through the drive of the motor drive unit 28. In step S12), when the stroke exceeds the target value, the control signal is input to the motor 31 from the control means 29 in the operation of the relay piston 14 and the motor drive unit 28 in the "disengagement" direction of the clutch. (Step S1), the clutch is actuated in the “disengaged” direction via the drive of the motor drive unit 28, and the stroke is adjusted.

  As described above, according to the first example, the relay piston 14 is operated by the motor 31, the gear mechanism 32, the linear motion mechanism 33, the hydraulic cylinder 35, and the like of the motor drive unit 28. It can be simplified, the manufacturing cost can be reduced, and the operation reliability can be improved. In addition, since the motor 31, the gear mechanism 32, the linear motion mechanism 33, the hydraulic cylinder 35, and the like of the motor drive unit 28 control the relay piston 14 finely, the relay piston 14 can be operated appropriately. Furthermore, as shown in the flow of FIG. 3, the clutch can be repeatedly engaged and disengaged, so that the stroke can be easily set to the target value. Furthermore, the stroke can be controlled with a small hydraulic pressure controlled by the motor drive unit 28.

  The motor drive unit 28 includes a motor 31 that receives a control signal, a gear mechanism 32 that is connected to the motor 31, a linear motion mechanism 33 that is connected to the gear mechanism 32, and a hydraulic cylinder 35 that is operated by the linear motion mechanism 33. When the relay piston 14 is arranged to be operated via the hydraulic flow path 42 by the operation of the hydraulic cylinder 35, the relay piston 14 is operated via the hydraulic pressure of the hydraulic flow path 42 on the motor 31 side. The piston 14 can be controlled more finely, and the relay piston 14 can be suitably operated.

  When the control means 29 for giving a control signal to the motor 31 of the motor drive unit 28 is provided, the relay piston 14 is finely controlled by the control means 29 via the motor 31, so that the relay piston 14 can be operated more suitably. .

  The outer cup 44 arranged around the piston rod 7 has a sliding resistance larger than the control hydraulic pressure, so that the operation of the pedal clutch (not shown) and the automatic control by the motor 31 can be used together. It is possible to prevent overstroke due to manual operation during the operation.

  4 and 5 show a second example of an embodiment for carrying out the present invention.

  The clutch booster of the second example includes a power cylinder part 51 connected to a release lever (not shown) so as to connect and disconnect the clutch, a relay piston part 52 that assists the operation of the power cylinder part 51, and a power cylinder part 51. And a housing 53 in which the relay piston portion 52 is disposed.

  The power cylinder portion 51 includes a power piston 56 that partitions the internal space 54 of the housing 53 and is surplused by a spring 55, and a piston rod 57 that is fixed to the power piston 56 and is positioned in the cylinder case 53 a of the housing 53. ing.

  The relay piston part 52 is slidably arranged in the piston hole 58 of the housing 53 so as to be formed at a position adjacent to the power cylinder part 51, and the valve piston 60 is actuated by the operation of the relay piston 59. And a poppet valve 61 that contacts or separates. Here, a communication passage 62 connected to an air tank (not shown) is provided on one end side (the anti-relay piston side) of the poppet valve 61, and a spring is provided on one side (poppet valve side) of the relay piston 59. An intermediate chamber 64 in which 63 is disposed is provided.

  First air that can introduce compressed air from the air tank (not shown) to the rear side of the power piston 56 through the communication passage 62 and the intermediate chamber 64 by the operation of the relay piston 59 and the poppet valve 61. A flow path (not shown) and a pipe (not shown) are connected (in the figure, symbol B indicates that the intermediate chamber 64 leads to the internal space 54 of the housing 53). Further, the housing 53 is formed with a second air passage 65 communicating from the midway position of the relay piston 59 to the front side of the power piston in the internal space 54, and a first air passage (not shown) and a second air passage 65 are formed. The air flow path 65 can communicate with an internal flow path 59 a in the relay piston 59.

  The clutch booster of the second example includes a motor drive unit 66 adjacent to the housing 53 of the power cylinder unit 51 and a control means (ECU) 67 for giving a command to the motor drive unit 66. Includes a motor 68 that receives a control signal from the control means 67, a gear mechanism (drive mechanism) 69 such as a reduction gear 69 a connected to the motor 68, a forward and backward movement in conjunction with the gear mechanism 69, and a relay piston 59. A linear motion mechanism (drive mechanism) 70 of a feed screw 70a that is arranged in series and contacts the other side (anti-poppet valve side) of the piston rod 57, a motor 68, a gear mechanism 69, and a motor side on which the linear motion mechanism 70 is disposed. And a housing (not shown). In the figure, reference numeral 71 denotes an exhaust valve.

  Hereinafter, the operation of the second example of the embodiment of the present invention will be described.

  In the second example, when the clutch is disengaged, a control signal is input from the control means 67 to the motor 68 in accordance with the operation of the driver as shown in the flow of FIG. 5 (step S21). Then, the motor 68 is driven by the control signal (step S22), the gear mechanism 69 such as the reduction gear 69a is rotated, and the rotation of the gear mechanism 69 is minimized by the linear motion mechanism 70 of the feed screw 70a (rightward in FIG. 4). The relay piston 59 is slid to the right side in the drawing (step S23), and the relay piston portion 52 pushes the poppet valve 61 to the right side to communicate the intermediate chamber 64 and the communication flow path 62, thereby supplying compressed air. From the air tank to the rear side of the power piston 56 in the internal space 4 of the housing 53 through the communication flow path 62, the intermediate chamber 64, the first air flow path (not shown), and the piping (not shown). (Step S24), the power piston 56 is pushed to the right in the figure with the assistance of compressed air, a release lever (not shown) is pushed through the piston rod 57, and the clutch is disengaged (step S25). .

  When the clutch is to be “engaged”, a control signal is output from the control means 67 to the motor 68 in accordance with the operation of the driver as shown in the flow of FIG. 5 (step S26). 68 (step S27), the gear mechanism 69 such as the reduction gear 69a is reversely rotated, and the rotation of the gear mechanism 69 is converted into a minimum stroke (leftward in FIG. 4) by the linear motion mechanism 70 of the feed screw 70a. The relay piston 59 is slid to the left in the drawing (step S28), and the relay piston 59 and the poppet valve 61 are returned to the left in the drawing by the restoring force of the spring 63 to communicate with the intermediate chamber 64. The communication of the flow path 62 is closed, and the compressed air on the rear side of the power piston 56 in the internal space 4 of the housing 53 is released (step S29). Retracted to the left in the drawing, return the release lever (not shown) to its original position via the piston rod 57, the clutch "contact" (step S30).

  When the clutch is "disengaged" or "contacted", the position of the stroke is determined by the control means 67. In the operation in the "disengaged" direction of the clutch (step S25), as shown in the flow of FIG. Is less than the target value, the drive stage of the relay piston 59 and the motor drive unit 66 is returned to the stage of inputting a control signal to the motor 68 from the control means 67 (step S21). Further, the clutch is operated in the “disengagement” direction via the clutch, and when the stroke exceeds the target value in the operation of the clutch in the “disengagement” direction (step S25), the relay piston 59 and the motor drive unit 66 are operated. Is shifted to the step of inputting a control signal from the control means 67 to the motor 68 in the operation in the “contact” direction of the clutch (step S26). It actuates the clutch in the "contact" direction through the driving of the over motor drive unit 66, and adjust the stroke.

  On the other hand, as shown in the flow of FIG. 5, in the operation of the clutch in the “contact” direction (step S30), when the stroke is less than the target value, the drive stage of the relay piston 59 and the motor drive unit 66 is controlled by the control means. 67, the control signal is returned to the step of inputting the control signal to the motor 68 (step S26), and the clutch is further operated in the “contact” direction via the drive of the motor drive unit 66. Step S30) When the stroke exceeds the target value, the control signal is input to the motor 68 from the control means 67 in the operation of the relay piston 59 and the motor drive section 66 in the "disengagement" direction of the clutch. (Step S21), the clutch is operated in the “disengagement” direction via the drive of the motor drive unit 66, and the stroke is adjusted. .

  As described above, according to the second example, the relay piston 59 is operated by the motor 68, the gear mechanism 69, and the linear motion mechanism 70 of the motor driving unit 66. Cost can be reduced. Further, since the motor 68, the gear mechanism 69, and the linear motion mechanism 70 of the motor driving unit 66 finely control the relay piston 59, the relay piston 59 can be suitably operated. Further, since the minute connection and disconnection can be repeated as in the flow of FIG. 5, the stroke can be easily set to the target value. Furthermore, the stroke can be controlled with a small load controlled by the motor drive unit 66.

  The motor drive unit 66 includes a motor 68 that receives a control signal, a gear mechanism 69 that is connected to the motor 68, and a linear motion mechanism 70 that is connected to the gear mechanism 69, and the relay piston 59 is connected to the linear motion mechanism 70. If it arrange | positions so that it may act | operate by a drive, since the structure which act | operates the relay piston 59 via oil_pressure | hydraulic becomes unnecessary, manufacturing cost can be reduced.

  In addition, the clutch booster of this invention is not limited only to the above-mentioned example, Of course, it can add various changes within the range which does not deviate from the summary of this invention.

It is the schematic which shows the clutch booster of the 1st example of embodiment which implements this invention. It is an enlarged view which shows the motor drive part of a 1st example. It is a flow which shows operation | movement of the clutch booster of the 1st example of embodiment which implements this invention. It is the schematic which shows the clutch booster of the 2nd example of embodiment which implements this invention. It is a flow which shows operation | movement of the clutch booster of the 2nd example of embodiment which implements this invention. It is the schematic which shows the conventional clutch booster.

Explanation of symbols

6 Power Piston 14 Relay Piston 16 Poppet Valve 28 Motor Drive Unit 29 Control Unit 31 Motor 32 Gear Mechanism (Drive Mechanism)
33 Linear motion mechanism (drive mechanism)
35 Hydraulic cylinder (drive mechanism)
56 Power piston 59 Relay piston 61 Poppet valve 66 Motor drive unit 67 Control means 68 Motor 69 Gear mechanism (drive mechanism)
70 Linear motion mechanism (drive mechanism)

Claims (4)

  A clutch booster that introduces air through a poppet valve by the operation of a relay piston and pushes in a power piston with the assistance of air, and includes a motor drive unit that operates the relay piston through a drive mechanism by a motor. Features a clutch booster.   The motor drive unit includes a motor for receiving a signal, a gear mechanism connected to the motor, a linear motion mechanism connected to the gear mechanism, and a hydraulic cylinder operated by the linear motion mechanism. The clutch booster according to claim 1, wherein the clutch booster is arranged to operate via a hydraulic flow path by the operation of the hydraulic cylinder.   The motor drive unit includes a motor for receiving a signal, a gear mechanism connected to the motor, and a linear motion mechanism connected to the gear mechanism, and the relay piston is arranged to operate by driving the linear motion mechanism. The clutch booster according to claim 1, wherein:   The clutch booster according to any one of claims 1 to 3, further comprising control means for giving a signal to the motor of the motor drive unit.

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