JP3754539B2 - Vane type swing actuator seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal structure of a vane type swing actuator used in a drive unit of an automatic door opening / closing device of a vehicle, a machine tool, and other automation devices.
[0002]
[Prior art]
The present applicant described in Japanese Patent Laid-Open No. 8-93716 distributed before the filing of the present application, in a vane that reciprocates at a rotational angle with a working fluid between a pair of fixed walls provided radially in a casing. A vane formed by projecting surrounding walls of a working surface having a predetermined area on both surfaces of the vane to form a pressure receiving portion, and the pressure receiving portion covering the outlet of the working fluid in an airtight manner at the stroke end of the vane Developed a seal structure for a rocking actuator.
In the above seal structure, even if the vane seal is broken and internal leakage occurs, the pressure receiving part in the vane at the stroke end is covered with the air inlet in an airtight state, to the back pressure side. Because the working fluid does not leak and the vane can maintain the stroke end state, and at the time of starting the vane, the outflow inlet is covered in an airtight manner with the pressure receiving part that is in contact with the fixed wall at the stroke end. Even if the working fluid was supplied at the time of starting the vane, the working area was not insufficient, and the vane was normally started.
[0003]
[Problems to be solved by the invention]
However, the casing has a pair of upper and lower portions sealed and joined and integrated, and a minute gap is formed between the surrounding wall that is in close contact with the inner surface of the casing at the stroke end and the upper and lower portions of the inner surface of the casing. Therefore, there is a problem that must be solved, for example, the working fluid flows into the pressure receiving portion from the gap , the vane swings in the reverse direction, and as a result, the device connected to the output shaft of the vane moves backward. It was.
[0004]
[Means for Solving the Problems]
The present invention, in each of both side surfaces of the vane, to both upper and lower portions except the corresponding sites of the joints of the casing, to form a pressure receiving portion provided to protrude the surrounding wall of the working surface having a predetermined area, whereas The pressure receiving part of the vane covers the outlet at the end of the vane in an airtight manner so that the end face of the surrounding wall does not cover the joint part of the casing, and is in close contact with the inner face of the casing. By connecting each of the openings provided in each working surface through a communication passage formed in the vane so as to penetrate the corresponding part, the working fluid is simultaneously applied to the working surfaces in both of the isolated pressure receiving parts. The above problem is solved by applying pressure.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 4, the vane type swing actuator 1 is provided with a vane 4 integrally formed with an output shaft 3 in a substantially semi-cylindrical casing 2 so as to be swingable. The two pressure chambers 5 and 5a are partitioned in an airtight manner.
[0006]
The casing 2 is formed by integrally forming a pair of upper and lower upper portions 2a and 2b by sealing the joint portion 6 in an airtight manner. The inner space of the casing 2 is provided with a pair of stoppers provided on both stroke end sides of the vane 4. The contact wall surfaces 7 and 7a and the outer peripheral portion of the vane 4 are formed in a substantially fan-shaped cross section by a sliding contact wall surface 8 which is in airtight contact with the outer periphery.
In addition, an output shaft 3 integrally formed with the vane 4 is installed at the boundary between the contact wall surfaces 7 and 7 a inside the casing 2, and upper and lower end portions 3 a and 3 b of the output shaft 3 are provided above and below the casing 2. The vane 4 is reciprocally swingable at a fixed angle with the output shaft 3 as a rotation shaft, and the upper end portion 3a of the output shaft 3 protruding from the upper part of the casing 2 is the drive shaft of the driven machine. It is made to connect to.
The contact wall 7,7a open with compressed air, provided the outflow inlet 9, 9a of the working fluid pressure oil such as the casing 2, a pair of electromagnetic valves provided with the inlet and outlet opening 9, 9a on the lower casing 2 10 , 10a, respectively.
The swing angle of the vane 4 corresponds to the angle between the abutting wall surfaces 7 and 7a serving as the stroke end of the vane and is set to about 150 ° in the present embodiment, but is not limited to this method. In the vane type swing actuator, an angle generally limited to 300 ° or less may be used. When the angle exceeds 180 °, the casing 2 has a cylindrical shape.
[0007]
The vane 4 is integrally formed by fixing the output shaft 3 to one side portion of the rectangular plate-shaped vane base 11, and has a vertically long racetrack-shaped recess at the center of each side surface of the vane base 11. 12 is formed, and a protrusion 13 is formed on the outer periphery of the recess 12.
In the center of the recess 12 , a vertically long groove 14 is formed so as to intersect the portion corresponding to the joint 6 of the casing 2 on both side surfaces of the vane 4, and a plate 15 having the same shape and size as the recess 12 is formed in the recess 12. The openings 16 and 16a communicating with the grooves 14 are formed on the upper and lower ends of the plate 15 while being fitted therein . As described above, the groove 14 covered with the plate 15 forms a communication passage 17 formed in the vane 4 so as to pass through a portion corresponding to the joint 6, and is opened through the communication passage 17. part 16, 16 a communicates, the openings 16, 16 a, in the pressure receiving portion 22, 22 a to be described later, the surrounding wall 21, 21 actuating surface 20 which is surrounded by a, 20 a in such being established disposed Is set.
The portion of the output shaft 3 excluding the upper and lower ends 3a and 3b (hereinafter referred to as the rotating shaft 3) and the entire vane base 11 excluding the periphery of the openings 16 and 16a are made of synthetic rubber such as nitrile rubber or silicon. The rubber 18 is integrally formed with the vane 4.
Further, on each of both side surfaces of the vane 4, the upper and lower portions excluding the corresponding portion with the joint portion 6 of the casing 2 have a predetermined area for moving the vane 4 by the working fluid, that is , an operating surface 20 having an operating area. Enclosure walls 21 and 21a surrounding the rectangular shape 20a are formed to form pressure receiving portions 22 and 22a . When the vane 4 reaches the stroke end, one of the pressure receiving portions 22 and 22a is abutting wall surface 7 or 7a. The working fluid outflow inlets 9 and 9a provided in the inner wall are hermetically covered.
[0008]
A number of vertical ridges 23, 23 a... Are projected at predetermined intervals on the corresponding part of the rotating shaft 3 in the vane 4, and the vertical ridges 23, 23 a. By making contact, the seal is made rotatable with an appropriate sliding resistance.
Further, on both sides of the vane 4, each side 24, 24 a, that is, a long side 25, 25 a parallel to the rotation axis 3 of the vane 4, a short side 26, 26 a. The sliding contact projections 28 and 28a sliding in an airtight manner on the sliding contact wall surface 8 in the casing 2 are inclined outwardly on the upper and lower edges 27 and 27a of the rotary shaft 3 of the vane 4 between 26a. The sliding contact pieces 28, 28a are thin and have a triangular cross-section, and the tip thereof is formed at an acute angle as shown in FIGS.
Further, the ridge 29 provided in the center between the sliding contact pieces 28 and 28a protruding from the long sides 25 and 25a of the vane 4 is provided on the side of the long sides 25 and 25a of the vane 4 when the vane 4 is assembled to the casing 2. The sliding contact pieces 28, 28a and the vertical protrusions 23, 23a on the rotating shaft 3 side are assembled while being in sliding contact with the inner wall of the casing 2, but the rotating shaft 3 side provided with the vertical protrusions 23, 23a is on the side. Since the frictional resistance in the vertical direction is large, by providing the protrusion 29, the sliding contact pieces 28, 28a on the long sides 25, 25a side of the vane 4 are incorporated in a balanced and even manner in parallel with the rotating shaft 3 side. Like.
[0009]
Next, the operation of the seal structure of the vane type swing actuator according to the present invention will be described.
First, in the pre-start state the end faces of the surrounding wall 21,21a vane 4 facing the one abutment wall 7, in contact with the top and bottom of each hermetically shaped abutment wall 7 except the joint 6, the pressure receiving portion 22 a together with the bears outflow inlet 9 in an airtight manner, forms a space in the pressure chamber 5 by the pressure receiving portion 22,22a both in communication via the communicating passage 17, Matasuri contact protrusion 28 , 28a abuts against the sliding wall surface 8 in the casing 4 in an airtight manner.
When flowing the working fluid to the pressure receiving portion 22 a from the inlet and outlet opening 9 of the pressure chamber 5 side, even working fluid flows into the pressure receiving portion 22 via the communication passage 17, the pressure receiving this working fluid both The operation surfaces 20 and 20a in the portions 22 and 22a are pressed to push the vane 4, and the other abutting wall surface 7a serving as the stroke end in this rotational direction is connected to the surrounding wall 21 in the pressure receiving portions 22 and 22a on the opposite side, the end face of 21a abuts to Hikanmuri outflow inlet 9a to the pressure receiving portion 22 a is provided on the abutment wall 7a in an airtight manner.
By switching the solenoid valves 10 and 10a, the operating pressure side is converted into a pressure chamber 5a opposite to the above, thereby causing the vane 4 to reciprocate angularly and thereby the output shaft 3 can obtain forward and reverse rotational force. The driven machine connected to the output shaft 3 is swung.
[0010]
Further, when the vane 4 is started, the outflow inlets 9 and 9a are not directly sealed by the vane 4, but the outflow inlets 9 and 9a provided on one of the pressure receiving portions 22 and 22a on the contact wall surfaces 7 and 7a are airtight. By being covered, the working surfaces 20 and 20a are secured so that the allowable surface pressure required to move the vane 4 by the working fluid can be obtained, and both the pressure receiving portions 22 and 22a are connected by the communication passage 17. since in communication, the working fluid which has flowed into the one of the pressure receiving portion 22 to flow into the other of the pressure receiving portion 22a, even when supplying the working fluid at the start of the vane 4 without insufficient operation area, thus the vane 4 The operation failure of the vane 4 such as the delay of the activation of the vane 4 or the activation of the vane 4 can be solved, and the working fluid is quickly distributed to the operation surfaces 20 and 20a of the vane 4 so that the vane 4 is normally activated.
Therefore, for example, even when the vane type swing actuator 1 according to the present invention is connected to an automatic door opening / closing device of a vehicle, it takes time to start or the door is not operated when the door is opened or closed. It can be completely prevented from not doing.
In addition, the sliding contact projections 28 and 28a that slide in an airtight manner in the casing 2 are provided on the sides 24 and 24a on both sides of the vane 4 so that the vane 4 exhibits a sealing effect with an appropriate sliding resistance. Even if one of the sliding contact protrusions 28 is damaged, the other sliding contact protrusion 28a prevents internal leakage of the working fluid.
[0011]
【The invention's effect】
In short, the present invention projects the surrounding walls 21, 21 a of the working surfaces 20, 20 a having a predetermined area on both the upper and lower portions of the both sides of the vane 4 except for the corresponding portions with the joint 6 of the casing 2. to form the pressure receiving portion 22,22a and, since one of the pressure receiving portion 22, 22 a is form as bears the outflow inlet 9, 9a in an airtight manner at the stroke end of the vane 4, vane 4 stroke end Since the end faces of the surrounding walls 21 and 21a are in close contact with the upper and lower portions of the contact wall surfaces 7 and 7a excluding the gap portion formed between the joint portions 6 on the inner surface of the casing 2, the inner surfaces of the pressure receiving portions 22 and 22a Can be made a completely isolated space .
Accordingly, since the vane 4 can be completely stopped at the stroke end position and maintained in this state, it is possible to prevent the reverse movement of the device using the vane type swing actuator 1 as a drive unit, in particular, the vehicle. If it is used for the drive part of an automatic door, it can maintain a completely closed state, so it is effective for measures against crime prevention and prevention of blowing rainwater into the vehicle.
Moreover, since communicating via the respective working surface 20, 20 opening portion 16 opened in a, 16 a communicating passage 17 which is formed in the vane 4 as respectively to latent through the corresponding portions of the bonding portion 6 of the It is possible to close most of the side surfaces of the vane 4 in a completely contact state, to simultaneously apply the pressure of the working fluid to the isolated working surfaces 20 and 20a, and to start the vane 4 smoothly. The effect is great.
[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 cross-sectional view taken along the line AA in FIG.
FIG. 3 is a simplified perspective view in which a part of the vane-type swing actuator is broken.
FIG. 4 is a diagram showing an internal structure of a vane type swing actuator.
FIG. 5 is a front view of a vane.
6 is a right side view of FIG. 5. FIG.
7 is a plan view of FIG. 5. FIG.
8 is a cross-sectional view taken along the line BB in FIG.
FIG. 9 is a cross-sectional view taken along the line CC of FIG.
10 is a cross-sectional view taken along the line DD of FIG.
11 is a cross-sectional view taken along the line EE of FIG. 6;
[Explanation of symbols]
2 Casing
2a , 2b Upper and lower part 4 Vane 7, 7a Contact wall 9, 9a Outlet
16, 16 a opening
17 passages
20, 20a Working surface
21, 21a Go wall
22, 22a Pressure receiving part

Claims (1)

An operation in which a vane capable of reciprocating and swinging is provided in a casing in which a pair of upper and lower parts are joined and integrated through a seal, and a vane abutting wall surface is formed at both stroke ends of the vane, and the corresponding wall surface is opened. An actuator having a fluid inlet / outlet formed in a casing;
In each of both side surfaces of the vanes, both in upper and lower portions except the corresponding sites of the joints of the casing, to form a pressure receiving portion provided to protrude the surrounding wall of the working surface having a predetermined area, each actuating surface Each of the opened openings is communicated through a communication passage formed in the vane so as to pass through the corresponding portion, and one of the pressure receiving parts is covered with the above-mentioned outflow inlet in an airtight manner at the stroke end of the vane. seal structure of a vane type oscillating actuator, characterized in that form to.

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