JPH0536133U - Vehicle hydraulically actuated cylinder device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a hydraulic cylinder device for a vehicle capable of stably and reliably performing air bleeding work in a hydraulic system. [Structure] A hydraulic cylinder device of a vehicle includes a master cylinder 6 operated by depression of a clutch pedal 4.
And a reserve tank 13 arranged near the master cylinder 6, and a pressure liquid outlet 39 of the reserve tank 13.
And a pressure liquid supply port 29 of the master cylinder 6, and a pressure liquid supply port 2 of the supply hose 40.
An air bleeding branch hose 42 branched from the portion on the 8th side and connected to the upper part of the reserve tank 13, and a check valve or reed valve arranged in the reserve tank 13 for closing the open end of the branch hose 42. 45 and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulically actuated cylinder device for a vehicle that operates a clutch such as a cab over truck.

[0002]

[Prior Art]

 The clutch of a vehicle such as a truck is operated intermittently by depressing a clutch pedal arranged in the driver's cab. Specifically, when the master cylinder connected to the clutch pedal is actuated by depressing the clutch pedal, the pressure in the pressure chamber of this master cylinder rises, and this pressure is transmitted to the slave cylinder, The clutch is activated by the slave cylinder acting.

By the way, a reserve tank is connected to the above-mentioned master cylinder, and it is possible to replenish the pressure liquid from this reserve tank to the master cylinder side. When the vehicle is a cab-over truck, the reserve tank is located inside the front panel located below the front window. The reserve tank is used not only for replenishing the pressure liquid, but also for servicing the vehicle and when exchanging the pressure liquid in the hydraulic system including the master cylinder and the slave cylinder.

That is, when exchanging the pressure fluid, it is necessary to perform air bleeding work in the fluid pressure system. For this air bleeding, the master cylinder is repeatedly operated to remove the pressure fluid in the reserve tank from the master cylinder. It is carried out by sending the bubbles to the slave cylinder side via the hydraulic cylinder and expelling the air bubbles accumulated in the hydraulic system from the master cylinder to the reserve tank side through the hydraulic system.

Therefore, in the prior art, in order to expel air bubbles from the master cylinder to the reserve tank, the pressure supply port of the master cylinder is set at a lower level position than the pressure liquid outlet of the reserve tank. Positioned, these pressure fluid outlet and pressure fluid supply port are connected to each other by a hose.

[0006]

[Problems to be solved by the device]

 By the way, in recent years, in the above-mentioned cab over truck, the front window tends to be enlarged by lowering the lower edge of the front window in order to increase the visibility from the driver's seat. On the other hand, such an increase in the size of the front window leads to a decrease in the size of the front panel described above. Since it cannot be positioned high enough with respect to the supply port, there is a problem that the above-mentioned air bleeding work in the hydraulic system cannot be performed.

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to perform the air bleeding work in the hydraulic system even in a vehicle which is restricted in the arrangement level of the reserve tank. Another object of the present invention is to provide a hydraulically actuated cylinder device for a vehicle that can be reliably implemented.

[0008]

[Means for Solving the Problems]

 According to the hydraulically actuated cylinder device for a vehicle of the present invention, a master cylinder that is actuated by pedal operation and is capable of supplying pressurized liquid to a slave cylinder, and a reserve tank that is arranged in the vicinity of this master cylinder and stores the pressurized liquid And a bottom portion of this reserve tank and the pressure fluid supply port of the master cylinder are connected to each other, a supply pipeline for supplying the pressure fluid in the reserve tank to the master cylinder, and one end of which is connected to the pressure fluid supply port side. An air bleeding line whose end is located above the reserve tank and opens into the reserve tank, and an air bleeding line that is installed in the reserve tank and allows only the flow from the reserve tank to the air bleeding line side And a check valve that opens and closes the other end opening of the pipeline.

[0009]

[Action]

 According to the above hydraulically actuated cylinder device, the master cylinder is repeatedly actuated when the pressure liquid in the hydraulic system is replaced, and the pressure liquid in the reserve tank is slaved through the master cylinder. When it is discharged to the side, the air bubbles staying in the hydraulic system are expelled from the master cylinder side into the reserve tank through the air vent pipe and the check valve, and the air vent operation is performed. Will be.

[0010]

【Example】

 Referring to FIG. 1, a portion of the cab overtrack is shown. This cab overtrack includes a cab 1 that can be tilted at the front part of a vehicle body frame, and a loading platform 2 located behind the cab 1. A driver's seat 3 is mounted in the cab 1, and a clutch pedal 4 is arranged above the floor surface of the cab 1, for example. The clutch pedal 4 is pivotally attached at its upper end, and a lever 5 is attached to the upper end so as to rotate integrally with the clutch pedal 4. The lever 5 extends toward the driver's seat 3 side, and a push rod 7 extending from the upper end of the master cylinder 6 is connected to the tip of the lever 5. The master cylinder 6 is inclined at a predetermined angle with respect to the vertical direction so that the push rod 7 can be pushed in via the lever 5.

A hydraulic fluid line 8 extends from the lower end of the master cylinder 6. The hydraulic fluid line 8 is a clutch 10 of the transmission 9, that is, a slave for engaging and disengaging the clutch 10. It is connected to a cylinder (not shown). In the case of this embodiment, the slave cylinder is an operating cylinder with power assist. Therefore, when the driver depresses the clutch pedal 4, the pressure in the master cylinder 6 rises, and this pressure is transmitted to the slave cylinder through the pressure liquid pipe 8, so that the slave cylinder is driven. The clutch 10 will be disengaged via this.

A lower side of the front window 11 of the cab 1 is a front panel 12, and a reserve tank 13 is fixedly arranged in the front panel 12. The reserve tank 13 is connected to the above-described master cylinder 6 via a connection hose 14, and the connection hose 14 penetrates a dash panel 15 that partitions the inside of the cab 1 and the inside of the front panel 12. It is extended.

The connection relationship between the master cylinder 6 and the reserve tank 13 is illustrated in detail in FIG. 2, and therefore, in the following, referring to FIG. 2, the master cylinder 6, the reserve tank 13 and the connection are shown. The structure of the hose 14 will be described. Note that, in FIG. 2, the dash panel 15 is indicated by a dashed line. The master cylinder 6 includes a cylinder housing 16. A pair of bolt insertion holes 17 are formed on the outer surface of the cylinder housing 16 on the dash panel 15 side, and therefore, a mounting bolt (not shown) or the like inserted through these bolt insertion holes 17 is used. The cylinder housing 16 is fixed to the dash panel 15 side.

A cylinder bore 18 is formed in the cylinder housing 16 concentrically with its axis, and a master piston 19 is fitted in the cylinder bore 18. Therefore, a pressure chamber 20 is defined in the cylinder bore 18 between the inner end surface located below the cylinder bore 18 and the lower end of the master piston 19. Although not shown in FIG. 2, a pressure liquid outlet 21 is provided at the lower end of the cylinder housing 16, and the pressure liquid outlet 21 is connected to the pressure chamber 20 on one side, On the other hand, it is connected to the slave cylinder via the pressure fluid line 8 described above.

In the pressure chamber 20, a return spring 22 is stretched between the cylinder housing 16 and the master piston 19, and the return spring 22 urges the master piston 19 to the rest position shown in the drawing. And is positioned. When the master piston 19 is in the rest position, the upper end of the master piston 19 is in contact with the stopper ring 23 at the upper end of the cylinder bore 18.

A boot 24 is attached to the upper end of the cylinder housing 16 so as to cover the push rod 7. The boot 24 allows the push rod 7 to be pushed in, while the boot 24 is inserted into the cylinder bore 18. Prevents dust from entering. Seals 25 and 26, which are in sliding contact with the inner peripheral surface of the cylinder bore 18, are respectively attached to both ends of the master piston 19, and the outer peripheral surface of the master piston 19 is located between the seals 25 and 26. An annular groove 27 is formed.

On the other hand, a pressure liquid supply port 28 is formed in the cylinder housing 16. One end of the pressure liquid supply port 28 is opened to the outer surface of the cylinder housing 16, and the other end is a master piston. Regardless of the stroke position of 19, it is always in communication with the annular groove 27 described above. That is, when the master piston 19 is in the rest position shown in the drawing, the other end of the pressure liquid supply port 28 communicates with the lower end of the annular groove 27.

Further, in the master piston 19, a slot 29 located in the annular groove 27 and extending in the axial direction and an axial hole connected to the lower end portion of the slot 29 are respectively formed. The direction hole is opened at the lower end of the master piston 19. A valve 50 is mounted in the axial hole. The valve 50 includes a valve shaft 30 slidably fitted in an axial hole. The valve shaft 30 projects from the lower end of the master piston 19 and has a valve body 31 at the projecting end. It is provided. Further, a valve sheet 32 having an opening is attached to the lower end of the master piston 19 so as to cover the valve body 31, and a valve spring 33 is provided between the valve seat 32 and the valve body 31. Has been passed over. The valve spring 33 urges the valve body 31, that is, the valve shaft 30 upward, and the upper end of the valve shaft 30 is in contact with the stopper pin 34. The stopper pin 34 is provided so as to penetrate the slot 29, and both ends thereof are supported by the cylinder housing 16. Further, inside the valve shaft 30, an internal passage 35 is formed which opens at one end to the upper end of the valve shaft 30 and at the other end opens to the outer peripheral surface on the valve body 31 side.

In the illustrated state, there is a certain gap between the lower end of the master piston 19 and the valve body 31 of the valve 50, which causes the internal passage 35 of the valve shaft 30 to be open. is there. That is, the valve 50 is in the open position. Therefore, in this state, the above-mentioned pressure liquid supply port 28 is connected to the pressure chamber 20 via the annular groove 27, the slot 29 and the valve 50.

On the other hand, as is apparent from FIG. 2, the reserve tank 13 is formed by closely contacting a lower tank 36 and an upper tank 37 made of synthetic resin with each other, and a cap 38 is attached to and detached from the upper tank 37. It is attached freely. A pressure liquid outlet 39 is formed on the outer wall of the reserve tank 13 in the vicinity of the bottom wall thereof. In the case of this embodiment, as is apparent from FIG. 2, the reserve tank 13 is arranged at a position where the pressure liquid outlet 39 is lowered to the height level of the pressure liquid supply port 28 of the master cylinder 6 described above.

The pressure liquid outlet 39 of the reserve tank 13 is connected to one end of a supply hose 40 which serves as a supply line, and the other end of the supply hose 40 penetrates the dash panel 15 and a connector 41. It is connected to the pressure liquid supply port 28 of the master cylinder 6 via. Further, in the case of this embodiment, a branch hose 42 serving as an air vent pipe is branched from the other end of the supply hose 40, and the branch hose 42 extends upward and toward the reserve tank 13. Also, regarding the path from the pressure liquid supply port 28 to the branch portion of the branch hose 42, this path has a predetermined angle with respect to the horizontal plane so as to incline upward toward the reserve tank 13. ..

On the side wall of the reserve tank 13, an air circulation port 43 is formed at an upper portion thereof, that is, above the liquid level in the reserve tank 13, and the air circulation port 43 is formed. The branch hose 42 described above is connected. Further, on the ceiling wall of the reserve tank 13, there is integrally formed a rectangular recess 44 which is located in the vicinity of the air circulation port 43 and is recessed upward, and this recess 44 serves as a check valve. The base of the reed valve 45 is press-fitted and attached.

The reed valve 45 is entirely made of rubber, and on one surface of its base, as shown in FIG. 3, a plurality of grooves 46 are parallel to each other in the inserting direction with respect to the recess 44. Is formed. Therefore, due to the presence of these grooves 46, the base portion of the reed valve 45 is more easily elastically deformed, and the insertion into the recess 44 is easy.

The membranous valve element 47 of the reed valve 45 itself has, for example, a wall thickness of, for example, 0.5 mm and is a square of 20 × 20 mm in length and width, while its base has a wall thickness of 5 mm. The vertical and horizontal dimensions are 10 x 20 mm. In the state of FIG. 2, the valve body 47 of the reed valve 45 is shown in the closed position in which the air flow port 43 is closed by contacting the inner wall of the reserve tank 13 with the valve body 47.

In the hydraulic system of the clutch 10 described above, in order to replace the hydraulic fluid in the hydraulic system at the time of maintenance and inspection, first, the old hydraulic fluid is discharged from the hydraulic system, and then the clutch pedal 4 is pressed. With the pressure released, for example, new pressure liquid is gently poured into the reserve tank 13. In this case, since the valve element 31 in the master cylinder 6 is in the open state as described above, the pressure fluid is supplied from the reserve tank 13 to the slave cylinder side via the master cylinder 6 and the pressure fluid conduit 8. It will be.

Then, when the hydraulic system is filled with a predetermined amount of the hydraulic fluid, the clutch pedal 4 is repeatedly stepped on while continuously pouring the hydraulic fluid into the reserve tank 13, and Air bleeding work is performed in the system. That is, when the push rod 7 is pushed into the cylinder housing 16 by the clutch pedal 4 and the master piston 19 is moved toward the pressure chamber 20 side, the lower end of the master piston 19 abuts the valve body 31, and the valve The internal passage 35 of the shaft 30, and thus the valve 50, will be closed. Then, when the master piston 19 is further moved, the pressure liquid in the pressure chamber 20 is delivered to the slave piston side through the pressure liquid conduit 8.

After that, when the clutch pedal 4 is returned, the master piston 19 is rapidly returned to the rest position shown in the figure by the biasing force of the return spring 22 without the pressure fluid on the pressure chamber 20 side following it. As a result, the valve 50 described above is opened and the pressure liquid in the reserve tank 13 is sucked into the pressure chamber 20. Therefore, the master piston 19 also has the above-described pump function, and the clutch pedal 4 is repeatedly depressed, that is, the master cylinder 19 is continuously operated, so that the pressurized fluid in the reserve tank 13 is released. It is sent to the hydraulic system on the pressure chamber 20 side. It should be noted that the air bleeding valve (not shown) on the slave piston side is, of course, opened when the pressure liquid is fed into the hydraulic system.

As described above, when the clutch pedal 4 is repeatedly stepped on and the hydraulic fluid is fed into the hydraulic system, the bubbles staying in the hydraulic system are accompanied by the bubbles in the master cylinder 6. It is expelled from the pressure chamber 20 through the valve 50 and the pressure liquid supply port 28, and then led from the pressure liquid supply port 28 to the branch hose 42 through the supply hose 40. That is, the path from the pressure liquid supply port 28 to the branch hose 42 is inclined upward toward the reserve tank 13, and the branch hose 42 is located at a higher level position than the supply hose 40. The bubbles expelled from the liquid supply port 28 are always guided into the branch hose 42, and are discharged from the liquid level in the branch hose 42 to the atmosphere side.

Since the reed valve 45 that opens and closes the air circulation port 43 is installed in the reserve tank 13, the pressure liquid on the reserve tank 13 side is transferred to the master cylinder when the clutch pedal 4 is returned. When trying to send it into the pressure chamber 20 of No. 6, the pressure liquid is surely sent to the master cylinder 6 side only through the supply hose 40.

That is, considering the case where the reed valve 45 does not exist, due to the difference in suction resistance between the supply hose 40 side and the branch hose 42 side, the reserve tank 13 side mainly The pressurized liquid comes to be sucked into the master cylinder 6 side through the branch hose 42. Therefore, the air bubbles in the pressurized liquid in the branch hose 42 are sucked into the master cylinder 6 again, and further, the air in the reserve tank 13 is sucked. Is also sucked into the master cylinder 6 side, so that it is impossible to send out the pressure liquid into the hydraulic system, that is, to bleed the air.

However, in the above-described embodiment, since the reed valve 45 is provided in the air circulation port 43 of the reserve tank 13, the air in the reserve tank 13 flows into the branch hose 42 through the air circulation port 43. There is no such a case, and only the air accumulated in the branch hose 42 is discharged into the reserve tank 13 through the reed valve 45 in the open position shown by the chain double-dashed line in FIG. ..

Therefore, since the pressure liquid is sucked from the reserve tank 13 side into the master cylinder 6 only through the supply hose 40, the pressure liquid can be sent out into the hydraulic system, and the air bleeding operation can be performed. It can be carried out stably and reliably. The function of the reed valve 45 described above is clear from the graph of FIG. The abscissa of this graph shows the number N of times of air bleeding work, and the ordinate shows the stroke of the piston on the slave cylinder side. In FIG. 4, the solid line shows the result of air bleeding work with the reed valve 45, while the broken line shows the result of air bleeding work without the reed valve 45. ing. As can be seen from the solid line, when the reed valve 45 is provided, the stroke of the piston on the slave cylinder side becomes the specified value L when the air bleeding operation is repeated many times. You can see that the removal is complete. On the other hand, if the reed valve 45 is not provided as is apparent from the broken line, the piston stroke on the slave cylinder side does not reach the specified value L even if the air bleeding operation is repeated, and Air bleeding becomes impossible.

In the case of this embodiment, the number of times of air bleeding work is such that the clutch pedal 4 is repeatedly depressed 10 times to depress and the air bleeding valve on the slave cylinder side is opened and closed once. The present invention is not limited to the above-described embodiment and can be variously modified. For example, in the reserve tank 13 shown in FIG. 5, the ceiling wall on the side of the air circulation port 43 is inclined so as to project upward from the cap 38, and the recess formed at the top of this ceiling wall is formed. The base of the reed valve 45 is press-fitted into the place 44. With such a configuration, the position where the air circulation port 43 is formed can be set to a higher position than in the case of one embodiment, and as a result, the pressure liquid that can be stored in the reserve tank 13 can be set. The amount can be increased.

Further, referring to FIG. 6, a modified row of the pressure liquid supply port 28 on the master cylinder 6 side is shown. The pressure liquid supply port 28 of this modified example is branched into two passages in advance in the cylinder housing 16, and the passage 28a on the lower side is connected to the reserve tank 13 via the connector 41 and the supply hose 40. The upper passage 28b is connected to the reserve tank 13 via the connector 41 and the branch hose 42.

Further, in each of the reed valves 45 shown in FIGS. 2 and 5, the valve body 47 is elastically deformed laterally to open and close the air circulation port 43. The circulation port 43 may be formed so as to open upward, and the air circulation port 43 may be closed by the reed valve 45 from above. Furthermore, in the air bleeding work of the hydraulic system, in addition to repeatedly depressing the clutch pedal 4 while pouring the pressurized liquid into the reserve tank 13, for example, the pressurized liquid is sent from the reserve tank 13 to the master cylinder 6 side, Alternatively, the pressure can be sent from the slave cylinder side.

[0036]

[Effect of the device]

 As described above, according to the hydraulically actuated cylinder device for a vehicle of the present invention, the pressure liquid supply port of the master cylinder and the bottom of the reserve tank are connected via the supply pipe line, while the pressure liquid supply port and the reserve are connected. It is connected to the upper part of the tank via an air bleeding line, and the open end of this air bleeding line on the reserve tank side is closed by a check valve that allows only the flow from inside the reserve tank to the air bleeding line side. Therefore, when the hydraulic fluid in the hydraulic system between the master cylinder and the slave cylinder side is exchanged, the air in the hydraulic system can be evacuated stably and reliably. Also, by providing the air vent pipe and the check valve, the effect of the reserve tank layout is great, such as less restrictions on the layout of the reserve tank.

[Submission date] June 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content] [Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulically actuated cylinder device for a vehicle that operates a clutch such as a cab over truck.

[0002]

[Prior Art]

 The clutch of a vehicle such as a truck is operated intermittently by depressing a clutch pedal arranged in the driver's cab. Specifically, when the master cylinder connected to the clutch pedal is actuated by depressing the clutch pedal, the pressure in the pressure chamber of this master cylinder rises, and this pressure is transmitted to the slave cylinder, The clutch is activated by the slave cylinder acting.

By the way, a reserve tank is connected to the above-mentioned master cylinder, and it is possible to replenish the pressure liquid from this reserve tank to the master cylinder side. Incidentally, when the vehicle is of the cab-over truck, the reserve tank may in some cases that will be installed in the cab, which is arranged in maintenance you located below the front window for better inspection of openable the front panel is there.

Further, the reserve tank is used not only for replenishing the pressure liquid, but also for maintenance and inspection of the vehicle and replacement of the pressure liquid in the hydraulic system including the master cylinder and the slave cylinder. There is. That is, when exchanging the pressure fluid, it is necessary to perform air bleeding work in the fluid pressure system.For this air bleeding, the master cylinder is repeatedly operated, and the pressure fluid in the reserve tank is slaved through the master cylinder. It is carried out by sending it to the cylinder side and expelling the air bubbles staying in the hydraulic system from the master cylinder to the reserve tank side through the hydraulic system.

Therefore, in the prior art, in order to expel air bubbles from the master cylinder to the reserve tank, the pressure supply port of the master cylinder is set to a lower level position than the pressure outlet of the reserve tank. Positioned, these pressure fluid outlet and pressure fluid supply port are connected to each other by a hose.

[0006]

[Problems to be solved by the device]

By the way, in recent years, in the above-mentioned cab over truck, the front window tends to be enlarged by lowering the lower edge of the front window in order to expand the field of view from the driver's seat. Upsizing of such front window is at one, since it leads to miniaturization of the front panel described above, when arranging the Rizabuta link to the front panel, the liquid outlet of the reserve tank Masutashi cylinder pressure Since it cannot be positioned sufficiently high with respect to the liquid supply port, there is a problem that the above-mentioned air bleeding work in the hydraulic system cannot be performed.

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to perform the air bleeding work in the hydraulic system even in a vehicle which is restricted in the arrangement level of the reserve tank. It is to provide a hydraulically actuated cylinder device for a vehicle that can be reliably implemented.

[0008]

[Means for Solving the Problems]

According to the hydraulically actuated cylinder device for a vehicle of the present invention , a master cylinder that is actuated by pedal operation and can supply pressurized liquid to a slave cylinder, and a reserve tank that is arranged in the vicinity of this master cylinder and that stores pressurized liquid And the bottom of this reserve tank and the pressure fluid supply port of the master cylinder are connected to each other, one end of which is connected to the pressure fluid supply port side, and a supply pipeline for supplying the pressure fluid in the reserve tank to the master cylinder. an air discharge duct which opens into the reserve tank located above the other end reserve tank, disposed in the middle reserve tank or air discharge duct, only the flow of the re Zabutanku inward from the air discharge duct And a check valve that allows

[0009]

[Action]

 According to the above hydraulically actuated cylinder device, the master cylinder is repeatedly actuated when the pressure liquid in the hydraulic system is replaced, and the pressure liquid in the reserve tank is slaved through the master cylinder. When the air is discharged, the air bubbles staying in the hydraulic system are expelled from the master cylinder side into the reserve tank through the air vent pipe and check valve, and the air vent operation is performed. Will be.

[0010]

【Example】

 Referring to FIG. 1, a portion of the cab-operated truck is shown. This cab overtrack includes a cab 1 that can be tilted at the front part of a vehicle body frame, and a loading platform 2 located behind the cab 1. A driver's seat 3 is mounted in the cab 1, and a clutch pedal 4 is arranged above the floor surface of the cab 1, for example. The clutch pedal 4 is pivotally attached at its upper end, and a lever 5 is attached to the upper end so as to rotate integrally with the clutch pedal 4. The lever 5 extends toward the driver's seat 3 side, and a push rod 7 extending from the upper end of the master cylinder 6 is connected to the tip of the lever 5. The master cylinder 6 moves up and down so that the push rod 7 can be pushed in via the lever 5, and gently pours new pressurized liquid into the reserve tank 13, for example. In this case, since the valve element 31 in the master cylinder 6 is in the open state as described above, the pressure fluid is supplied from the reserve tank 13 to the slave cylinder side via the master cylinder 6 and the pressure fluid conduit 8. It will be.

Then, when the hydraulic system is filled with a predetermined amount of the hydraulic fluid, the clutch pedal 4 is repeatedly stepped on while continuing the pouring of the hydraulic fluid into the reserve tank 13, and the hydraulic pressure is maintained. Air bleeding work is performed in the system. That is, when the push rod 7 is pushed into the cylinder housing 16 by the clutch pedal 4 and the master piston 19 is moved toward the pressure chamber 20 side, the lower end of the master piston 19 abuts the valve body 31, and the valve The internal passage 35 of the shaft 30, and thus the valve 50, will be closed. Then, when the master piston 19 is further moved, the pressure liquid in the pressure chamber 20 is delivered to the slave cylinder side through the pressure liquid pipe 8.

After that, when the clutch pedal 4 is returned, the master piston 19 is quickly returned to the rest position shown in the drawing by the biasing force of the return spring 22 without the pressure fluid on the pressure chamber 20 side following. As a result, the valve 50 described above is opened and the pressure liquid in the reserve tank 13 is sucked into the pressure chamber 20. Therefore, Masutapisuto down 19 is also provided with a pump function described above, it is incorporated viewed Stepping repeatedly clutch pedal 4, that is, by the master cylinder 19 is continuously operated, the liquid in the reservoir Butanku 13 It is sent to the hydraulic system.

As described above, when the clutch pedal 4 is repeatedly stepped on and the hydraulic fluid is fed into the hydraulic system, the air bubbles staying in the hydraulic system are accompanied by bubbles in the master cylinder 6. It is expelled from the pressure chamber 20 through the valve 50 and the pressure liquid supply port 28, and then led from the pressure liquid supply port 28 to the branch hose 42 through the supply hose 40. That is, the path from the pressure liquid supply port 28 to the branch hose 42 is inclined upward toward the reserve tank 13, and the branch hose 42 is positioned at a higher level position than the supply hose 40. The bubbles expelled from the liquid supply port 28 are always guided into the branch hose 42, and are discharged from the liquid level in the branch hose 42 to the inside of the reserve tank 13 .

Since the reed valve 45 that opens and closes the air circulation port 43 is installed in the reserve tank 13, the pressure liquid on the reserve tank 13 side is transferred to the master cylinder when the clutch pedal 4 is returned. When trying to send it into the pressure chamber 20 of No. 6, the pressure liquid is surely sent to the master cylinder 6 side only through the supply hose 40.

[0015] That is, since in the branch hose 42 air are mixed, is in a branch hose 42, smaller flow resistance than the supply hose 40 liquid having viscosity is filled, the lead valve 45 When it does not exist , the pressure liquid in the branch hose 42 mainly comes to be sucked into the master cylinder 6 side from the reserve tank 13 side, so that the bubbles in the pressure liquid in the branch hose 42 are re-generated. The master cylinder 6 is sucked, and further, the air in the reserve tank 13 is sucked to the master cylinder 6 side. Therefore, the pressure liquid is sent out into the hydraulic system, that is, the air is removed. It becomes impossible.

[0016] However, in one embodiment described above, since is provided a reed valve 45 to the air flow port 43 of the reserve tank 13, the bleeding operation, the air is in Figure 2, in the future reservoir into the branch hose 42, 2 Although released into reservoir Butanku 13 through the lead valve 45 in the open position indicated by dash-dotted, it is not such as to flow into the branch hose 42 air reserve tank 13 through the air flow port 4 3.

Therefore, since the pressure liquid is sucked into the master cylinder 6 from the reserve tank 13 side only through the supply hose 40, the pressure liquid can be sent out into the hydraulic system, and the air bleeding operation can be performed. It can be carried out stably and reliably. The function of the reed valve 45 described above is clear from the graph of FIG. The abscissa of this graph shows the number N of times of air bleeding work, and the ordinate shows the stroke of the piston on the slave cylinder side. In FIG. 4, the solid line shows the result of air bleeding work with the reed valve 45, while the broken line shows the result of air bleeding work without the reed valve 45. ing. As can be seen from the solid line, when the reed valve 45 is provided, if the air bleeding operation is repeated several times , the stroke of the piston on the slave cylinder side becomes the specified value L, which results in the air in the hydraulic system. You can see that the removal is complete. On the other hand, if the reed valve 45 is not provided as is apparent from the broken line, the piston stroke on the slave cylinder side does not reach the specified value L even if the air bleeding operation is repeated, and Air bleeding becomes impossible.

In the case of this embodiment, the number of air bleeding operations is repeated by depressing the clutch pedal 4 by depressing it 10 times , and thereafter, in order to bleed air in the slave cylinder, the air bleeding valve on the slave cylinder side is set to 1 The work to open and close once is defined as one work. The present invention is not limited to the above-described embodiment and can be variously modified. For example, in the reserve tank 13 shown in FIG. 5, the ceiling wall on the side of the air circulation port 43 is inclined so as to project upward from the cap 38, and the recess formed at the top of this ceiling wall is formed. The base of the reed valve 45 is press-fitted into the place 44. With such a configuration, the position where the air circulation port 43 is formed can be set to a higher position than in the case of one embodiment, and as a result, the pressure liquid that can be stored in the reserve tank 13 can be set. The amount can be increased.

Further, referring to FIG. 6, a modified example of the pressure liquid supply port 28 on the master cylinder 6 side is shown. The pressure liquid supply port 28 of this modified example is branched into two passages in advance in the cylinder housing 16, and the passage 28a on the lower side is connected to the reserve tank 13 via the connector 41 and the supply hose 40. The upper passage 28b is connected to the reserve tank 13 via the connector 41 and the branch hose 42.

Further, in each of the reed valves 45 shown in FIGS. 2 and 5, the valve body 47 is elastically deformed laterally to open and close the air circulation port 43. The circulation port 43 may be formed so as to open upward, and the air circulation port 43 may be closed by the reed valve 45 from above. Further, a check valve other than the reed valve 45 may be used, and the check valve may be installed not only in the reserve tank 13 but also in the branch hose 42, for example.

[0021]

[Effect of the device]

As described above, according to the hydraulically actuated cylinder device for a vehicle of the present invention, the pressure liquid supply port of the master cylinder and the bottom of the reserve tank are connected via the supply pipe line, while the pressure liquid supply port and the reserve are connected. connect the upper part of the tank via the air discharge duct, the flow only to the reserve tank interior through the air discharge duct in the middle of a open end or air discharge duct of the reserve tank side of the air discharge duct Since a check valve that allows it is provided , when exchanging the hydraulic fluid in the hydraulic system between the master cylinder and the slave cylinder side, ensure stable and reliable air bleeding in the hydraulic system. You can Further, by providing the air bleeding line and the check valve, the effect on the reserve tank layout is great, such as less restrictions on the layout of the reserve tank.

[Brief description of drawings]

FIG. 1 is a side view showing a part of a cab overtrack.

FIG. 2 is a cross-sectional view showing a master cylinder, a reserve tank, and a connection path for these.

FIG. 3 is a perspective view of a reed valve.

FIG. 4 is a graph showing a result of air bleeding work.

FIG. 5 is a cross-sectional view showing a reserve tank of another embodiment.

FIG. 6 is a sectional view showing another pressure liquid supply port of the master cylinder.

[Explanation of symbols]

 4 Clutch Pedal 6 Master Cylinder 13 Reserve Tank 14 Connection Hose 19 Master Piston 20 Pressure Chamber 28 Pressure Liquid Supply Port 40 Supply Hose (Supply Pipeline) 41 Connector 42 Branch Hose (Air Venting Pipeline) 45 Reed Valve (Check Valve) 50 valves

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[Procedure amendment]

[Submission date] June 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of device] Hydraulically actuated cylinder device for vehicle

[Scope of utility model registration request]

[Brief description of drawings]

FIG. 1 is a side view showing a part of a cab overtrack.

FIG. 2 is a cross-sectional view showing a master cylinder, a reserve tank, and their connection paths.

FIG. 3 is a perspective view of a reed valve.

FIG. 4 is a graph showing a result of air bleeding work.

FIG. 5 is a cross-sectional view showing a reserve tank of another embodiment.

FIG. 6 is a sectional view showing another pressure liquid supply port of the master cylinder.

[Explanation of symbols] 4 clutch pedal 6 master cylinder 13 reserve tank 14 connection hose 19 master piston 20 pressure chamber 28 pressure liquid supply port 40 supply hose (supply line) 41 connector 42 branch hose (air bleed line) 45 reed valve (Check valve) 50 valves

Claims (1)

[Scope of utility model registration request] 1. A master cylinder which is operated by pedal operation and can supply a pressure liquid to a slave cylinder, a reserve tank which is arranged in the vicinity of this master cylinder and stores the pressure liquid, and a bottom portion of this reserve tank and a master cylinder. A supply line that connects the pressure liquid supply port and supplies the pressure liquid in the reserve tank to the master cylinder, and has one end connected to the pressure liquid supply port side and the other end located above the reserve tank. A non-return valve that is installed in the air vent pipe that opens in the tank and the reserve tank that opens and closes the other end opening of the air vent pipe so that only the flow from the reserve tank to the air vent pipe side is allowed. A hydraulically actuated cylinder device for a vehicle, comprising: