JP3110261B2 - Seal structure of vane type swing actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention secures a sufficient working area to start a vane even when internal leakage of a working fluid occurs, and prevents leakage of the working fluid at the end of the stroke of the vane. The present invention relates to a seal structure of a vane type swing actuator described above.

[0002]

2. Description of the Related Art A vane-type oscillating actuator is provided with a vane that reciprocates at a rotational angle with a working fluid such as compressed air or pressure oil between a pair of fixed walls provided in a radial direction in a closed casing. Allowing the working fluid to flow into one of the two pressure chambers in the casing which is airtightly partitioned by
This allows the driven machine connected to the output shaft to oscillate by pushing the vane and applying a rotational force to the output shaft provided on the vane, thus making the structure simple, compact and lightweight. Since the mounting space is small, it is used in machine tools, automatic opening and closing devices for automatic doors of vehicles, and other automation devices in place of conventional link devices.

[0003] However, the vane is provided with a packing in a sliding portion with the casing to provide a sealing function. However, since the packing has a special shape corresponding to the rectangular shape of the vane, the contact portion with the casing is long, and the sliding is provided. If dynamic resistance is not taken into account, the operation of the vane will be hindered and sufficient output cannot be obtained.Therefore, the packing must be thinned to reduce sliding resistance, and as a result, the surface pressure required for sealing If the internal leakage occurs, the casing may be easily damaged due to shortage of the packing or burned out, etc., and the working fluid may pass through the vane and leak from the working pressure side to the back pressure side. The differential pressure inside the vane decreases, and the vane acts on the differential pressure and the operating pressure side (receiving pressure)
Although it can move with the pressure received on the surface, the working surface of the vane is flat, so it can not receive enough pressure due to internal leakage, speed is slowed, and the vane can not maintain the stroke end state Malfunctions, such as the inability to keep the door fully open or the door cannot be completely closed with an automatic door of a vehicle, etc. When starting the vane to be started, the working fluid passes through the vane and an internal pressure is generated, but the specified pressure is not reached, or since the internal pressure is not completely generated, the start of the vane is delayed,
The automatic door opening / closing device of a vehicle does not operate normally due to the failure of the vane to operate at all or the malfunction of the vane.

[0004]

SUMMARY OF THE INVENTION The present invention secures a sufficient working area for starting the vane in the event of internal leakage of the working fluid, and in particular, when the working fluid is leaked, particularly at the stroke end state of the vane. An object of the present invention is to provide a seal structure of a vane type swing actuator which prevents leakage and can completely maintain the state.

[0005]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned conventional technology, and in view of the problem that the vane malfunctions when an internal leak of the working fluid occurs due to the failure of the sealing function at the sliding portion of the vane. In a vane that reciprocates at a rotational angle with a working fluid between a pair of fixed walls provided in a radial direction, a pressure of the working fluid is applied to both surfaces of the vane.
A surrounding wall of an operating surface having a sufficient operating area for receiving and moving the vane is projected to form a pressure receiving portion, and the pressure receiving portion covers the outlet and the inlet of the working fluid in an airtight manner at the stroke end of the vane. In the event that the vane seal is broken and internal leakage occurs, the pressure receiving part covers the outflow and inlet ports in an airtight state at the stroke end, so the back pressure side Because the vane can maintain the state of the stroke end without fluid leakage, and at the time of starting the vane, the pressure receiving portion that is in contact with the fixed wall at the stroke end covers the outflow and inlet ports in an airtight manner. Even if the working fluid is supplied at the time of starting the vane, the working area does not become insufficient, the vane is started normally, the above-mentioned drawback is solved, and the inside of the casing is airtight on both sides of the vane. Nisuri By providing a sliding contact protruding piece to form a seal for the vane, the vane exerts a sealing effect with an appropriate sliding resistance, and even if one of the sliding contact protruding pieces is damaged, internal leakage will not occur. It can be prevented by sliding contact pieces.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a main body of a vane-type swing actuator, and the main body 1 includes an output shaft 3 in a substantially semi-cylindrical casing 2.
And a vane 4 integrally formed with the vane 4.
The inside of the casing 2 is partitioned into two pressure chambers 5 and 5a in an airtight manner.

The casing 2 is divided into upper and lower parts, and a joint 6 between an upper part 2a and a lower part 2b is hermetically sealed and integrally formed, and the inside of the casing 2 has a pair of fixed walls 7 in the radial direction. , 7a are provided and formed in a substantially fan-shaped cross section,
At the center thereof, the output shaft 3 integrally formed with the vane 4 is installed, and the upper and lower ends 3a, 3b of the output shaft 3 are rotatably mounted on bearings provided above and below the casing 2, and the output shaft 3 is rotated. The vane 4 can be swung by a certain angle as an axis,
The upper end 3a of the output shaft 3 protruding from the upper part of the casing 2 is connected to the drive shaft of the driven machine.

Reference numeral 8 denotes a sliding contact wall having an arc-shaped cross section in which the vane 4 reciprocating in a rotational angle between the fixed walls 7 and 7a slides in an airtight manner inside the casing 2, and at both ends of the sliding contact wall 8. The fixed walls 7, 7a serving as stroke ends of the vane 4 are provided, and the fixed walls 7, 7a are provided with outflow ports 9, 9a for working fluids such as compressed air and pressure oil. They are connected to a pair of solenoid valves 10, 10a provided at the lower part of the casing 2, respectively.

The swing angle of the vane 4 corresponds to the angle between the fixed walls 7 and 7a, which is the stroke end of the vane, and is set to about 150 ° in this embodiment, but is limited to such a method. Instead, it is sufficient that the angle is generally limited to 300 ° or less in the vane type swing actuator,
If it exceeds 180 °, the casing 2 is cylindrical.

Reference numeral 11 denotes a vane base provided in the shape of a rectangular plate of the vane 4. The output shaft 3 is fixed to and integrally formed with the vane base 11, and upper and lower end portions 3a and 3b of the output shaft 3 are formed. The removed portion (hereinafter referred to as the rotating shaft 3) and the entire vane base 11 are made of a synthetic rubber rubber 12 such as nitrile rubber or silicon.
To form a vane 4 integrally, and the vane 4 is moved on both sides of the vane 4 by receiving the pressure of the working fluid.
Working surface 13, 13 having a predetermined area sufficient for
a is formed as a pressure receiving portion by projecting surrounding walls 14 and 14a surrounding the rectangular shape a. The working fluid provided on the fixed walls 7 and 7a when the vane 4 reaches the stroke end. Outflow ports 9 and 9a are hermetically covered.

A plurality of vertical ridges 16, 16a... Are formed at predetermined positions at corresponding positions of the rotary shaft 3 in the vane 4, and when the vane 4 rotates, the vertical ridges 16, 16a. The rotary shaft 3 side of the vane 4 is rotatably sealed with an appropriate sliding resistance.

Also, on both sides of the vane 4, each side 17,
17a, that is, longitudinal sides 18, 18a parallel to the rotation axis 3 of the vane 4.
, The short sides 19, 19a parallel to the top and bottom, and the short sides 19, 19a
… On the upper and lower edges 20 and 20a of the rotating shaft 3 of the vane 4 between
Sliding contact piece that slides airtightly on sliding contact wall 8 in casing 2
The sliding contact projections 21 and 21a are thin and have a triangular cross section.
And an acute angle as shown in FIG.

Reference numeral 22 denotes a ridge provided at the center between the sliding contact pieces 21 and 21a protruding from the longitudinal sides 18 and 18a of the vane 4, and the longitudinal side of the vane 4 when the vane 4 is assembled to the casing 2. Sliding contact pieces 21 and 21a on the 18 and 18a sides and vertical protrusions on the rotating shaft 3 side
Are assembled while sliding on the inner wall of the casing 2. However, since the rotary shaft 3 provided with the vertical ridges 16, 16a has a greater frictional resistance in the vertical direction, the ridge 22 must be provided. The sliding contact projections 21, 21 on the longitudinal sides 18, 18a of the vane 4
a is parallel to the rotating shaft 3 so that it can be incorporated evenly with good balance.

Next, the operation of the seal structure of the vane type swing actuator according to the present invention will be described.
In the state before starting, the end face of the surrounding wall 14 of the vane 4 facing the one fixed wall 7 abuts the fixed wall 7 in an airtight manner, and the pressure receiving portion 15
Are airtightly covered with the outflow / inlet 9 provided in the fixed wall 7 and form a space for the pressure chamber 5.
a is in airtight contact with the sliding contact wall 8 in the casing 4.

Then, by causing the working fluid to flow into the pressure chamber 5, the working surface 12 in the pressure receiving portion 15 is pressed to push the vane 4, and the other fixed wall 7a , which is a stroke end in the rotation direction, is moved to the other fixed wall 7a . The end face of the surrounding wall 14a in the pressure receiving portion 15a is brought into contact with the pressure receiving portion 15a, and the pressure receiving portion 15a covers the outlet 9a provided in the fixed wall 7a in an airtight manner.

By switching the solenoid valves 10 and 10a to convert the working pressure side to a pressure chamber 5a opposite to the above, the vane 4
Is rotated in a reciprocating angle, whereby the output shaft 3 can obtain forward and reverse rotational force, and oscillates a driven machine connected to the output shaft 3.

Even if the sliding contact protrusions 21 and 21a are damaged and the working fluid passes from the working pressure side to the back pressure side, even if the vane 4 comes into contact with the fixed walls 7 and 7a at the stroke end state. Since the pressure receiving portions 15, 15a cover the outlets 19, 19a in an airtight manner to seal the pressure chambers 5, 5a, there is no leakage of the working fluid to the back pressure side.

When the vane 4 is started, the pressure receiving portion
15 and 15a hermetically cover the outlets 9 and 9a provided in the fixed walls 7 and 7a, and maintain the working area of the vane 4 without closing the outlets 9 and 9a. Working surface of
The working fluid is quickly distributed to the 13 and 13a to start the vane 4 normally.

[0019]

In summary, the present invention is directed to a vane 4 which reciprocates in rotational angle with a working fluid between a pair of fixed walls 7 and 7a provided in a casing 2 in a radial direction by a working fluid on both sides of the vane 4. To move the vane 4 under the pressure of
Surrounding walls 14 and 14a of working surfaces 13 and 13a having separate working areas
To form pressure receiving portions 15, 15a, and the pressure receiving portions 15, 15a.
In the case of 15a, the working fluid outflow and inlet ports 9 and 9a are hermetically covered at the stroke end of the vane 4. Therefore, if the seal of the sliding portion of the vane 4 is broken and internal leakage occurs, Although the differential pressure in the casing 2 is reduced, the working surface having the working area of the vane 4 is formed by the surrounding walls 14 and 14a on the working pressure side.
Since the working surfaces 13 and 13a are secured, the working surfaces 13 and 13a can receive sufficient pressure to move the vane 4, and the vane 4 can be moved to the stroke end in the pressure chambers 5 and 5a on the back pressure side. In the state of the stroke end in which the vane 4 is in contact with the fixed walls 7, 7a, the pressure receiving portion
Since the outlets 15 and 15a cover the outlets 19 and 19a in an airtight state, the working fluid does not leak to the back pressure side, and the vane 4 can maintain the stroke end state. When connected to a door opening / closing device, it is especially important to keep the door open and closed and to maintain the closed state, so that the door cannot be kept completely open as in the past, or the door cannot be completely closed. The door can be kept open and closed as specified without any problems.

In addition, at the stroke end, the pressure receiving portions 15, 15a can obtain an allowable surface pressure higher than that required for moving the vane by the working fluid without closing the outflow / inlet ports 9, 9a with the vane 4. The working surfaces 13, 13a are secured and the outlets 9, 9a are hermetically covered with pressure chambers 5, 5a.
, The working area does not become insufficient even when the working fluid is supplied at the time of starting the vane 4, and even if the seal of the sliding part of the vane 4 is broken, The working fluid passes through the vane to generate an internal pressure. However, it is possible to eliminate the vane operation failure such that the specified pressure is not reached, or the internal pressure is not completely generated, so that the start of the vane is delayed or not started at all. The working fluid can be quickly spread over the working surfaces 13 and 13a of the vehicle to perform normal startup. Therefore, for example, even when the main body 1 is connected to the automatic door opening / closing device of the vehicle, when the door is opened or closed, It doesn't take much time to start or the door doesn't work at all, and can start normally.

Further, since the sliding contact projections 21 and 21a which slide in the casing 2 in an airtight manner are provided on the sides 17 and 17a on both sides of the vane 4, the sealing effect is exerted on the vane 4 with an appropriate sliding resistance. In addition, even if one of the sliding contact pieces 21 and 21a is damaged, internal leakage can be prevented by the other sliding contact pieces 21 and 21a, and the practical effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a vane-type swing actuator according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a simplified perspective view in which a part of a vane type swing actuator is broken.

FIG. 4 is a view showing the internal structure of a vane-type swing actuator.

FIG. 5 is a front view of a vane.

FIG. 6 is a right side view of FIG.

FIG. 7 is a plan view of FIG. 5;

FIG. 8 is a sectional view taken along the line BB of FIG. 5;

FIG. 9 is a sectional view taken along the line CC in FIG. 5;

FIG. 10 is a sectional view taken along the line DD in FIG. 6;

[Explanation of symbols]

 2 Casing 4 Vane 7, 7a Fixed wall 9, 9a Outflow port 13, 13a Working surface 14, 14a Surrounding wall 15, 15a Pressure receiving part 17, 17a Side 21, 21a Sliding contact piece

Claims (2)

(57) [Claims] 1. A vane rotating angle reciprocate a pair of fixed walls provided radially in the housing by the working fluid, on both sides of the vane, based under the pressure of the working fluid
A surrounding wall of an operating surface having an operating area sufficient to move the pressure is formed to form a pressure receiving portion, and the pressure receiving portion covers the outlet and the inlet of the working fluid in an airtight manner at the stroke end of the vane. A seal structure for a vane-type oscillating actuator, characterized in that it is formed. 2. A seal structure for a vane-type swing actuator according to claim 1, wherein sliding contact projections are provided on both sides of the vane so as to slide in an airtight manner in the casing.