JPH0134986Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an improvement of an air servo device for clutch control.

b. Prior Art Generally, an orifice is provided in the air passage of an air servo device for clutch control to restrict high-pressure air. In addition to suppressing expansion and preventing damage, the atmospheric pressure chamber is kept at approximately the same pressure as atmospheric pressure to stabilize the operation of the piston.

c Problems to be solved by the invention However, in conventional air servo devices for clutch control, the orifice is formed directly into the device body and provided in communication with the passage, or a pin with an orifice drilled therein is press-fitted into the passage. It was set up as follows. However, the diameter of the orifice is
Since the pores are 0.2 to 0.3 mm, processability is poor and processing costs are high, and in the latter case, press-fit tolerances must be taken into consideration, making processing even more difficult. It was hot.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an air servo device for clutch control that can eliminate the above-mentioned drawbacks.

d Means for solving the problem In order to solve the problem of the above-mentioned conventional technology,
The present invention includes a power cylinder section, a control valve section, and a hydraulic cylinder section, and communicates the atmospheric pressure chamber of the power cylinder section and the atmospheric pressure chamber of the hydraulic cylinder section through a passage and an orifice. In the air servo device for clutch control, the passage located on the atmospheric pressure chamber side of the hydraulic cylinder portion is formed narrower than the atmospheric pressure chamber side of the power cylinder portion, and the end portion is bent into the narrowly formed passage. A curved portion of a rod-shaped body having a pressing portion formed by the above-mentioned pressure is pushed in and inserted, and an orifice is formed by the outer peripheral surface of the curved portion of the rod-shaped body and the wall surface of the passage.

e. Embodiment FIG. 1 shows an embodiment of the present invention, and the clutch control air servo device 1 shown in the figure includes a power cylinder section 2, a control valve section 3, and a hydraulic cylinder section 4. The power cylinder section 2 has a housing 5 divided by a piston 6 into a pressure chamber 7 and an atmospheric pressure chamber 8. The piston 6 has a connecting rod 9 in its center.
When not in operation, it is biased to the left inside the housing 5 by a spring 10.

The control valve section 3 has a housing 11 divided by a piston 12 and a valve 13 to form a hydraulic operation chamber 14, an exhaust chamber 15, an output pressure chamber 16, and a supply pressure chamber 17. The piston 12 has a vent hole 18 that communicates between the exhaust chamber 15 and the output pressure chamber 16, and is provided with a valve seat 19 at the tip thereof. Normally, the valve seat 20 of the valve 13 contacts the valve seat 21 of the housing 11 to close the output pressure chamber 16 and the supply pressure chamber 17. When the piston 12 operates, this valve 13 is pushed in by its tip valve seat 19, and the output pressure chamber 16
and the supply pressure chamber 17 are communicated with each other. At this time, the vent hole 18 of the piston 12 is closed. In addition, 22,2
3 is a spring that urges the piston 12 and valve 13 to the left in the figure; 24 is the exhaust chamber 1;
This is an exhaust port arranged in communication with 5. Further, the pressure chamber 7 of the power cylinder section 2 communicates with the output pressure chamber 16 of the control valve section 3 via the conduit 25, and the atmospheric pressure chamber 8 of the power cylinder section 2 communicates with the output pressure chamber 16 of the control valve section 3 via the conduit 25.
6 and a vent hole 18 of the piston 12 to communicate with the exhaust chamber 15 of the control valve section 3 .

The hydraulic valve section 4 transmits the force generated in the power cylinder section 2 to the release shaft lever (not shown) of the clutch, and engages one end of the piston 27 with the rod 9 of the power cylinder section 2. , a push rod 28 is disposed at the other end of the piston 27. A boot 30 is disposed at the end of the hydraulic cylinder 29 on which the piston 27 slides, and covers this. boots 30
This is to prevent the hydraulic cylinder 29 from being directly exposed to the atmosphere and protect it from dust, water, etc. The atmospheric pressure chamber 31 formed inside is connected to the power cylinder section through an orifice 32 and a passage 33. It communicates with the atmospheric pressure chamber 8 of No. 2.

The orifice 32 has a small diameter through hole that communicates with and forms a part of the passage 33, which is formed on the boot 30 side of the hydraulic cylinder 4, and a bent pin 34 is inserted into this through hole. It has been formed. That is, the orifice 32 has a bent pin 34
and the wall surface of the through hole. For this reason, the above-mentioned through hole is drilled to a diameter of about 1.3 mm, while the bent pin 34 is drilled with a diameter of 1.2 mm.
It is formed using a rod-shaped body that can be bent to a certain extent.
The bent pin 34 has a curved portion inserted into the through hole, and its end portion is bent at a substantially right angle to form a pressing portion 34a, whereby the bent pin 34 is formed in a straight line. This prevents it from slipping out of the through-hole, and also facilitates pushing into the through-hole.

The clutch control air servo device 1 according to the present invention connects its oil port 35 to a master cylinder (not shown), and also connects the air supply port 36 of the control valve section 3 to an air reservoir (not shown). is connected.

The operation of the clutch control air servo device 1 according to this embodiment will be explained below.

When the clutch pedal is depressed, oil is pumped from the master cylinder to the port 35 of the clutch control air servo device 1 in accordance with the amount of depression. The oil pressure fed to the port 35 acts on the piston 27 of the hydraulic cylinder section 4 and further acts on the piston 12 of the control valve section 3. As a result, the piston 12 moves to the right in the figure and comes into contact with the valve seat 20 of the valve 13, causing the vent hole 18
While closing the valve 13, the valve 13 is further pushed to the right to separate the valve seat 20 and the valve seat 21 of the housing 11. Therefore, the supply pressure chamber 17 and the output pressure chamber 16 communicate with each other, and the compressed air in the air reservoir flows from the supply pressure chamber 17 into the output pressure chamber 16 and further passes through the conduit 25 to the pressure chamber 7 of the power cylinder section 2. leading to. The compressed air flowing into the pressure chamber 7 moves the piston 6 to the right, and further moves the piston 27 of the hydraulic cylinder portion 4 to the right via the rod 9. This piston 27 further moves the push rod 28 to the right, and the release button at the tip thereof.
Activate the shaft lever and disconnect the clutch. At that time, the atmospheric pressure chamber 8 of the power cylinder section 2
The volume of the piston 12 decreases, and the resulting excess air flows through the passage 26 and the vent hole 18 of the piston 12.
It flows out into the exhaust chamber 15 of the control valve section 3 through the exhaust port 24, and is further discharged to the atmosphere from the exhaust port 24. During this time, the volume of the atmospheric pressure chamber 31 in the boot 30 changes due to the movement of the piston 27 to the right and the expansion of the boot 30, and thereby, for example, when the volume expands, the atmospheric pressure in the power cylinder section 2 increases. A portion of the excess air exhausted from chamber 8 is transferred to passage 3.
3. Absorb through orifice 32. As a result, the pressure in the atmospheric pressure chamber 31 becomes approximately the same as the atmospheric pressure. In contrast to the above, when the volume of the atmospheric pressure chamber 31 in the boot 30 is reduced, the excess air in the atmospheric pressure chamber 31 is transferred to the atmospheric pressure chamber 8 of the power cylinder section 2 via the orifice 32 and the passage 33. Similarly, the exhaust port 24 is discharged to the atmosphere, and the atmospheric pressure chamber 31 is
to atmospheric pressure.

When the clutch pedal is released in order to reconnect the clutch, the hydraulic pressure acting on the piston 27 of the hydraulic cylinder section 4 and the piston 12 of the control valve section 3 is released, so each member moves in the opposite direction as described above. It operates and returns to its original state. At that time, the compressed air in the pressure chamber 7 of the power cylinder section 2 passes through the conduit 25 to the output pressure chamber 1.
6 and further flows out into the exhaust chamber 15 through the vent hole 18 of the piston 12, a part of which temporarily increases the pressure in the atmospheric pressure chamber 8 through the passage 26, and is exhausted to the atmosphere through the other exhaust port 24. be done.

The atmospheric pressure chamber 8 of the power cylinder section 2 has a piston 6
As the pressure moves to the left, the chamber pressure decreases, but some of the compressed air in the pressure chamber 7 that has flowed into the exhaust chamber 15 of the control valve section 3 passes through the output pressure chamber 16, the vent hole 18, and the passage 26. Since it flows into the atmospheric pressure chamber 8, the chamber pressure does not decrease. During this period, the volume of the atmospheric pressure chamber 31 in the boot 30 changes due to the leftward movement of the piston 27 and the contraction of the boot 30, so that, for example, when the volume is reduced, the atmospheric pressure in the boot 30 changes. Excess air flows out from the chamber 31 through the orifice 32 and the passage 33 into the atmospheric pressure chamber 8 of the power cylinder section 2, bringing the atmospheric pressure chamber 31 to atmospheric pressure. In addition, when the volume of the atmospheric pressure chamber 31 in the boot 30 expands, contrary to the above, a part of the discharged compressed air of the pressure chamber 7 that has flowed into the atmospheric pressure chamber 8 of the power cylinder section 2 is transferred to the passage 33, It flows into the atmospheric pressure chamber 31 through the orifice 32 . As a result, the pressure in the atmospheric pressure chamber 31 becomes approximately the same as the atmospheric pressure.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

f. Effects of the invention As described above, the air servo device for clutch control according to the invention has a pressing part formed by bending the end in a narrow passage located on the atmospheric pressure chamber side of the hydraulic cylinder part. The curved part of the rod-shaped body is pushed in and inserted, and the orifice is formed by the outer peripheral surface of the curved part of the rod-shaped body and the wall of the passage, so the orifice can be easily and quickly obtained compared to conventional devices. This makes it possible to reduce product costs and to more effectively condense high-pressure air to approximately atmospheric pressure. Moreover, when forming the orifice, the rod-shaped body having the pressing part is easy to push into the passage, and
Once the rod-shaped body is inserted into the passage, the curved portion prevents it from coming out of the passage.
Excellent assembly workability and product reliability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a clutch control air servo device according to an embodiment of the present invention. 1... Air servo device for clutch control, 2...
Power cylinder section, 3... Control valve section, 4... Hydraulic cylinder section, 8... Atmospheric pressure chamber of power cylinder section, 31... Atmospheric pressure chamber of hydraulic cylinder section, 32... Orifice, 33... Passage, 34...Bent pin, 34a
...Press section.

Claims (1)

[Scope of utility model registration request] An air servo for clutch control, comprising a power cylinder part, a control valve part, and a hydraulic cylinder part, and in which the atmospheric pressure chamber of the power cylinder part and the atmospheric pressure chamber of the hydraulic cylinder part are communicated through a passage and an orifice. In the device, a passage located on the atmospheric pressure chamber side of the hydraulic cylinder part is formed narrower than that of the power cylinder part on the atmospheric pressure chamber side, and a pressing part is formed in the narrow passage by bending an end part. Insert and place the curved part of the rod-shaped body having
An air servo device for clutch control, characterized in that an orifice is formed by the outer peripheral surface of the curved portion of the rod-shaped body and the wall surface of the passage.