JPWO2020129586A1 - Barometric booster - Google Patents

Abstract

In the pressure type booster, the power piston advances and a part of the diaphragm is in contact with the inner peripheral surface of the front shell, and the constant pressure chamber and the thick portion accommodating chamber are in contact with each other. A communication part is formed to communicate with each other. As a result, in the airtight leakage detection process, even when the power piston advances and a part of the diaphragm comes into contact with the inner peripheral surface of the front shell, the folded portion of the diaphragm or the like is caught when assembling the pressure booster. In addition, if the airtight state of the constant pressure chamber is not maintained, a path is secured so that the constant pressure chamber communicates with the outside of the housing via the thick part accommodating chamber, so that airtight leakage can be reliably detected. can do. Therefore, the accuracy of detecting airtight leaks can be improved, and the reliability can be improved.

Description

The present invention relates to a pressure booster.

As a pressure booster, the inside of a housing having at least two shells is defined by a power piston into a constant pressure chamber and a transformation chamber, and a plunger arranged in a valve body connected to the power piston is moved by an input rod. As a result, the valve device is opened to introduce a working gas (atmospheric pressure) into the transformation chamber, and a pressure difference is generated between the constant pressure chamber in which the engine negative pressure is introduced and the transformation chamber, and the power is generated by this pressure difference. There is a structure in which the thrust generated in the piston is applied to the output rod via the reaction member, and a part of the output reaction force acting from the output rod to the reaction member is transmitted to the input rod via the plunger. For example, Patent Document 1 discloses a pressure type booster having such a structure in which a circumferential direction regulating portion for positioning the shell in the circumferential direction is formed to facilitate the positioning of the shell. There is.

Further, FIG. 7 shows a cross section of the pressure type booster having the above-mentioned structure around the outer peripheral portion of the power piston 100. As shown in FIG. 7, the power piston 100 defining the inside of the housing 102 into a constant pressure chamber 104 and a transformer chamber 106 has a diaphragm 108 having a wall thickness portion 110 at the outer edge, and the wall thickness of the diaphragm 108 is provided. The portion 110 is housed between the outer peripheral portion of the shell 112 and the outer peripheral portion of the shell 114, so that the constant pressure chamber 104 and the transformer chamber 106 are sealed from the outside of the housing 102 to be airtight. Note that FIG. 7 shows a state in which the power piston 100 is advanced to the left side in FIG. 7 by generating a pressure difference between the constant pressure chamber 104 and the transformer chamber 106.

JP-A-2018-12709

By the way, at the time of assembling the atmospheric pressure type booster as described above, there is a problem that the folded portion 108a of the diaphragm 108 of the power piston 100 is bitten and negative pressure leaks from the portion. Such a defect is an event to be detected in the airtight leakage detection process in which an airtight leak is checked by actually generating a pressure difference between the constant pressure chamber 104 and the transformer chamber 106 after assembling the pressure booster. Is. However, when a pressure difference is generated between the constant pressure chamber 104 and the transformer chamber 106, as shown in FIG. 7, the power piston 100 advances, and a part of the folded-back portion 108a of the diaphragm 108 is affected by the pressure difference. Because the diaphragm 108 is pulled into contact with the inner peripheral surface of the shell 112, the constant pressure chamber 104 becomes airtight even if the diaphragm 108 is bitten. Since the airtightness is achieved by such an unintended method, there is a problem that the airtightness cannot be detected in the airtight leakage detection process.

An object of the present invention is to improve the accuracy of detecting an airtight leak of a pressure booster and improve the reliability.

One embodiment of the present invention includes at least two shells and a power piston arranged between the two shells that defines two chambers and includes a diaphragm, which constitutes a wall thickness of the outer edge of the diaphragm. A part is accommodated between the outer peripheral portions of the two shells to seal the two chambers, and the power piston advances to form a part of the diaphragm. One of the two chambers formed by the shell arranged on the forward side and the power piston in contact with the inner peripheral surface of the shell arranged on the forward side of the shell, and the above-mentioned two chambers. It is characterized in that a communicating portion is formed for communicating with the thick portion accommodating chamber in which the thick portion is accommodated.

According to one embodiment of the present invention, it is possible to improve the detection accuracy of airtight leakage of the pressure booster and improve the reliability.

It is sectional drawing which shows the whole structure of the atmospheric pressure type booster which concerns on 1st Embodiment of this invention. It is a front view of the diaphragm of the atmospheric pressure type booster of FIG. 1 alone. It is sectional drawing which shows the periphery of the thick part of the diaphragm in the state which the power piston on the front side is advanced in the pressure type booster of FIG. It is a front view of the diaphragm alone of the atmospheric pressure type booster which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the periphery of the thick part of the diaphragm in the state which the power piston is advanced in the atmospheric pressure type booster which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the periphery of the thick part of the diaphragm in the state which the power piston is advanced in the atmospheric pressure type booster which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the peripheral part of the wall thickness part of the diaphragm in the state which the power piston is advanced in the conventional atmospheric pressure type booster.

Hereinafter, embodiments will be described with reference to the drawings. In addition, in FIGS. 1 to 6, the common parts are designated by the same reference numerals, and in FIGS. 1, 3, 5, and 6, the left side of each figure is the front side (front side). The right side is shown as the rear side (rear side).
FIG. 1 schematically shows the configuration of the atmospheric pressure type booster 50 according to the first embodiment of the present invention. As shown in the figure, the atmospheric pressure type booster 50 according to the first embodiment of the present invention is composed of a tandem type including two power pistons 7 and 8, and is composed of a front shell 1 and a rear shell 2. The inside of the housing 3 is divided into two chambers on the front side and the rear side by the center shell 4.

Further, the chamber on the front side is divided into a constant pressure chamber 9 and a transformer chamber 11 by a power piston 7 provided with a diaphragm 5. On the other hand, the chamber on the rear side is divided into a constant pressure chamber 10 and a transformer chamber 12 by a power piston 8 provided with a diaphragm 6. Each of the power pistons 7 and 8 has a structure supported by the valve body 13. Further, the thick portion 70 formed on the outer edge of the diaphragm 5 of the power piston 7 is accommodated in the annular thick portion accommodating chamber 72 formed between the outer peripheral portion of the front shell 1 and the outer peripheral portion of the center shell 4. The constant pressure chamber 9 and the transformer chamber 11 are sealed from the outside of the housing 3 to be airtight (see also FIG. 3). Similarly, the thick portion 74 formed on the outer edge of the diaphragm 6 of the power piston 8 is accommodated in the annular thick portion accommodating chamber 76 formed between the outer peripheral portion of the center shell 4 and the outer peripheral portion of the rear shell 2. The constant pressure chamber 10 and the transformer chamber 12 are sealed from the outside of the housing 3 to be airtight.

The valve body 13 is airtightly and slidably inserted into the center shell 4 and the rear shell 2, and the rear end portion extends to the outside of the housing 3. In the rear shell 2, the insertion portion of the valve body 13 is configured as a small-diameter tubular portion 2a, and the dust boot 14 is attached to the small-diameter tubular portion 2a. The dust boot 14 covers the hollow shaft portion 13b of the valve body 13 extending from the housing 3. The valve body 13 is configured by connecting a cup-shaped main body portion 13a and a hollow shaft portion 13b in succession, the main body portion 13a as a sliding portion with respect to the center shell 4, and the hollow shaft portion 13b with respect to the rear shell 2. Each is configured as a sliding portion. Further, a substantially cylindrical hollow boss portion 13c is formed on the cup-shaped bottom portion of the main body portion 13a. Negative pressure in which two constant pressure chambers 9 and 10 communicate with each other in the main body 13a of the valve body 13 and each constant pressure chambers 9 and 10 are connected to a valve device 22 provided in the hollow shaft portion 13b. Passages 15a and 15b are provided. Further, the main body portion 13a of the valve body 13 is provided with a first atmospheric passage 16 for connecting the transformer chamber 12 on the rear side to the valve device 22 in the hollow shaft portion 13b.

On the other hand, a plurality of tubular (two in this embodiment) communication pipes 18 are arranged in the constant pressure chamber 10 on the rear side, and the transformer chamber 12 on the rear side is provided inside each communication pipe 18. A second air passage 17 communicating with the transformer chamber 11 on the front side is provided. Further, one end of each communication pipe 18 is press-fitted and fixed to the center shell 4, and the other end is airtightly and slidably inserted into the power piston 8 on the rear side so as to be close to the rear shell 2. It is extended to the part. A penetrating rod 41 is inserted into each communication pipe 18 which airtightly penetrates the front shell 1 and the rear shell 2 and airtightly penetrates and extends the power piston 7 on the front side. Stud bolts 42, 43 are integrally provided at both ends of the through rod 41, and these stud bolts 42, 43 are arranged in an upright state on the rear surface of the rear shell 2 and the front surface of the front shell 1. There is. Two of the through rods 41 and the stud bolts 42 and 43 are provided at intervals of 180 degrees in the circumferential direction, but the rear shell 2 and the front shell 1 are 90 degrees out of phase with these stud bolts. Two general-purpose stud bolts 44 are erected at the position. On the other hand, for example, engine negative pressure is introduced into the constant pressure chamber 9 on the front side through the pipe joint 19 provided in the front shell 1, and this negative pressure is applied to the rear side through the negative pressure passages 15a and 15b. It is also introduced into the constant pressure chamber 10 of the above.

The valve device 22 switches the transformer chambers 11 and 12 to the constant pressure chambers 9, 10 or the outside air in conjunction with the input rod 24 as an input shaft that advances and retreats to the front shell 1 and the rear shell 2, and is a plunger. It is composed of 25, a poppet valve 27, a negative pressure valve 29, an atmospheric valve 31 and a valve spring 32. The plunger 25 is slidably fitted in the hollow interior of the hollow boss portion 13c of the valve body 13 along the axial direction, and is connected to an input rod 24 that is interlocked with a brake pedal (not shown). The rear end of the poppet valve 27 is fixed to the inner peripheral surface of the hollow shaft portion 13b of the valve body 13 by a pressing member 26.

The negative pressure valve 29 is formed by the outer peripheral edge of the front end of the poppet valve 27 and the negative pressure valve seat 28 formed on the inner peripheral surface of the hollow shaft portion 13b (hollow boss portion 13c) of the valve body 13. It is configured to be in contact with and separated from each other. The atmospheric valve 31 is configured such that the inner peripheral edge portion of the front side end portion of the poppet valve 27 and the annular atmospheric valve seat 30 formed at the rear side end portion of the plunger 25 are in contact with each other and separated from each other. Is. One end of the valve spring 32 is locked to the input rod 24, and the poppet valve 27 is constantly urged in the valve closing direction. A return spring 33 is interposed between the pressing member 26 and the input rod 24, and when the plunger 25 is not operating without input from the brake pedal, the return spring 33 causes the rear end of the plunger 25. The state in which the atmospheric valve seat 30 is brought into contact with the inner peripheral edge of the front end of the poppet valve 27 is maintained.

The tip of the plunger 25 is provided with a small diameter portion 60 having a diameter smaller than the inner diameter of the hollow inside of the hollow boss portion 13c. By providing the small diameter portion 60, the tip surface of the plunger 25 has a small diameter. It is composed of a first tip surface 25a located at the tip of the portion 60 and a second tip surface 25b extending outward in the radial direction from the base end of the small diameter portion 60. The first tip surface 25a faces the reaction member 35 described later so as to be abuttable, and the second tip surface 25b faces the reaction force member 64 described later so as to be abuttable. Further, in the present embodiment, an annular locking groove 62 having a predetermined width is formed on the outer peripheral portion on the rear end side of the plunger 25.

A stop key 39 as a receding end defining member is inserted into a substantially boundary portion between the main body portion 13a and the hollow shaft portion 13b of the valve body 13, that is, the hollow boss portion 13c from the radial direction thereof. In this state, one end of the stop key 39 protrudes into the hollow inside of the hollow boss portion 13c, and the other end side protrudes into the transformer chamber 12 on the rear side, and one end protruding into the hollow inside of the hollow boss portion 13c. The side is engaged in a locking groove 62 provided in the plunger 25, which is one of the valve devices 22. The stop key 39 moves along the axial direction together with the valve body 13 or the input rod 24 to define the retracted ends of the valve body 13 and the input rod 24, and is provided on the small diameter tubular portion 2a of the rear shell 2. The position in contact with the step portion 40 is the original position. Further, the stop key 39 regulates the relative movement amount between the valve body 13 and the plunger 25.

Further, a counterbore portion 68 is formed in the opening on the tip end side of the hollow boss portion 13c of the valve body 13, and a reaction force member 64 is slidably formed in the counterbore portion 68 along the axial direction. Have been placed. In the present embodiment, the reaction force member 64 has an annular shape, one surface 65 faces the reaction member 35 described later with reference to the sliding direction thereof, and a part of the other surface 66 is the first of the plunger 25. It faces the tip surface 25b of 2. The remaining portion of the other surface 66 of the reaction force member 64 faces the seat surface of the counterbore portion 68 of the hollow boss portion 13c so as to be in contact with the seat surface. On the other hand, at the tip of the hollow boss portion 13c of the valve body 13, a reaction member 35 made of an elastic body such as rubber and a large diameter portion 36a of the output rod 36 are arranged, and the plunger 25 and the reaction force member 64 are arranged. It can come into contact with the back surface of the reaction member 35.

In the constant pressure chamber 9 on the front side, a return spring 37 for returning the valve body 13 to the original position is arranged in the cup-shaped main body portion 13a of the valve body 13. The return spring 37 has one end on the front side at the rear back portion of the recess 1a of the front shell 1, and the other end on the rear side thereof via the rod holder 38 and the cup bottom (hollow boss) of the main body portion 13a of the valve body 13. It is arranged in a state of being in contact with each of the portions 13c). That is, the rod holder 38 is pressed and fixed to the valve body 13 by the return spring 37.

Further, the rod holder 38 has a cup portion 38a that partially covers the large diameter portion 36a of the output rod 36 and a brim portion 38b with which the return spring 37 abuts, and the entire rod holder 38 is formed in a hat shape. .. The bottom surface portion 38c of the cup portion 38a is formed with an insertion hole 47 having a diameter larger than the outer diameter of the rod portion 36b through which the rod portion 36b of the output rod 36 is inserted in the central portion thereof. The space formed by the cup portion 38a of the rod holder 38 and the output rod 36 is a negative pressure passage 15c that connects the constant pressure chamber 9 to the valve device 22, and the insertion hole 47 and the rod portion of the output rod 36. The annular space formed between the 36b and the 36b is a negative pressure passage 15d that connects the constant pressure chamber 9 to the valve device 22. Further, an annular space formed between the outer circumference of the brim portion 38b of the rod holder 38 and the inner peripheral surface of the main body portion 13a of the valve body 13 forms a negative pressure passage 15e that connects the constant pressure chamber 9 to the valve device 22. It has become. Here, the negative pressure passage 15 is composed of the negative pressure passages 15a, 15b, 15c, 15d and 15e, and the negative pressure passage 15 constitutes the continuous passage in the present embodiment. The valve body 13 is constantly urged toward the rear side (return direction) by the return spring 37. The rod holder 38 also functions as a retainer for suppressing the reaction member 35 and the output rod 36 from being separated from the valve body 13.

Here, FIG. 2 shows a front view of a single diaphragm 5 of the power piston 7. As shown in the drawing, the folded-back portion 78 of the diaphragm 5 is provided with a plurality of ridge portions 82 as communication portions 80 at intervals in the circumferential direction of the diaphragm 5. More specifically, these convex portions 82 are provided in the region of the diaphragm 5 that comes into contact with the inner peripheral surface 1b of the front shell 1 in a state where the power piston 7 is advanced, as will be described later, with reference to FIG. ing. Further, each of the convex portions 82 is in a direction orthogonal to the circumferential direction of the diaphragm 5 along the region of the diaphragm 5 that comes into contact with the inner peripheral surface 1b of the front shell 1 when the power piston 7 is advanced (the paper surface of FIG. 3). It is formed so as to extend in a parallel direction) and project toward the constant pressure chamber 9 side. Further, as shown in FIG. 2, the diaphragm 5 is provided with two insertion holes 84 into which the through rods 41 are inserted and mounting holes 86 into which the valve body 13 is mounted. As shown in FIG. 1, the diaphragm 6 of the power piston 8 is also provided with a plurality of ridges 82 as communication portions 80 at intervals in the circumferential direction of the diaphragm 6. Each of these ridges 82 extends along the region of the diaphragm 6 that comes into contact with the inner peripheral surface of the center shell 4 when the power piston 8 advances, in a direction orthogonal to the circumferential direction of the diaphragm 6, and is a constant pressure chamber. It is formed so as to project toward the 10 side.

The pressure type booster 50 is coupled to the vehicle body (not shown) and the master cylinder (not shown) via the stud bolts 42 and 43 on both ends of the through rod 41 and the general-purpose stud bolt 44. At this time, as shown in FIG. 1, the master cylinder (not shown) is coupled to the recess 1a provided on the front surface of the front shell 1. The cylindrical body 48 of the master cylinder is airtightly inserted into the bottom of the recess 1a and extends into the main body 13a of the valve body 13. Then, the rod portion 36b of the output rod 36 extends into the cylindrical body 48 and is connected to the piston (not shown) of the master cylinder.

Subsequently, the operation of the atmospheric pressure type booster 50 according to the first embodiment of the present invention will be described.
With reference to FIG. 1, when the brake pedal is depressed, the plunger 25 advances together with the input rod 24, and the atmospheric valve seat 30 at the rear end of the plunger 25 is located on the inner peripheral edge of the front end of the poppet valve 27. The atmospheric valve 31 is opened apart from the portion. As a result, the atmosphere flows into the hollow shaft portion 13b of the valve body 13 through the silencer and the filter, and this atmosphere is introduced into the transformer chamber 12 on the rear side via the first atmospheric passage 16 and in the communication pipe 18. It is also introduced into the transformer chamber 11 on the front side through the second atmospheric passage 17 of the above. As a result, a pressure difference is quickly generated between the transformer chambers 11 and 12 on the front side and the rear side where the atmosphere is introduced and the constant pressure chambers 9 and 10 on the front side and the rear side where the negative pressure is introduced. do. Then, due to this pressure difference, the power pistons 7 and 8 on the front side and the rear side are propelled, and the thrust thereof is from the tip of the hollow boss portion 13c of the valve body 13 through the reaction member 35 and the output rod 36 to the master cylinder. It is output to the side.

On the other hand, when the pedaling force on the brake pedal is released, the input rod 24 retracts due to the spring force of the return spring 33, and the plunger 25 also retracts. As a result, the atmospheric valve seat 30 of the plunger 25 comes into contact with the inner peripheral edge of the front end of the poppet valve 27 to close the atmospheric valve 31, while the poppet valve 27 is lifted by the plunger 25 to valve. The negative pressure valve 29 is opened at a distance from the negative pressure valve seat 28 of the body 13, and the negative pressure is applied to the front and rear transformer chambers 11 through the negative pressure passages 15a and 15b and the first and second atmospheric passages 16 and 17. Introduced in 12, the pressure difference is eliminated. After that, with a time lag from the input rod 24, the valve body 13 retracts due to the return spring 37 in the constant pressure chamber 9 on the front side, and the stop key 39 in contact with the valve body 13 moves to the step portion 40 in the rear shell 2. The negative pressure valve 29 is closed by returning to the original position of contact.

On the other hand, the pressure type booster 50 according to the first embodiment of the present invention is negative to the constant pressure chamber 9 as one of the inspection steps after its assembly, for example, in a state where atmospheric pressure is introduced into the transformer chamber 11. Pressure is applied and an airtight leak detection step is performed to inspect for airtight leaks. At this time, when a pressure difference is generated between the constant pressure chamber 9 and the transformer chamber 11 and the power piston 7 advances, as shown in FIG. 3, the inner peripheral surface of the front shell 1 of the folded portions 78 of the diaphragm 5 The area of the region facing 1b increases, and the region abuts on the inner peripheral surface 1b of the front shell 1 due to the influence of the pressure difference. Here, in the region of the diaphragm 5 that comes into contact with the inner peripheral surface 1b of the front shell 1, a plurality of ridge portions 82 (communication portions 80) are formed at intervals in the circumferential direction of the diaphragm 5. Therefore, the portions of the diaphragm 5 located on both sides of the convex portion 82 in the extending direction communicate with the constant pressure chamber 9 and the thick portion accommodating chamber 72 without contacting the inner peripheral surface 1b of the front shell 1. A passage is secured. As a result, if the folded-back portion 78 or the like of the diaphragm 5 is bitten during the assembly of the atmospheric pressure type booster 50, the constant pressure chamber 9 is outside the housing 3 through the passage secured by the ridge portion 82. Airtight leakage is detected.

The same applies to the diaphragm 6 of the power piston 8. When the power piston 8 advances, the area of the folded portion of the diaphragm 6 facing the inner peripheral surface of the center shell 4 increases, and the pressure difference further increases. Due to the influence, the region comes into contact with the inner peripheral surface of the center shell 4. However, since a plurality of ridges 82 (communication portions 80) are formed at intervals in the circumferential direction of the diaphragm 6 in the region of the diaphragm 6 that comes into contact with the inner peripheral surface of the center shell 4, the diaphragm 6 is formed. The portions located on both sides of the ridge portion 82 in the extending direction are not in contact with the inner peripheral surface of the center shell 4, and a passage connecting the constant pressure chamber 10 and the thick portion accommodating chamber 76 is secured. As a result, if the folded portion of the diaphragm 6 or the like is caught during the assembly of the atmospheric pressure type booster 50, the constant pressure chamber 10 is connected to the outside of the housing 3 through the passage secured by the ridge portion 82. Through communication, airtight leakage is detected.

As described above, the pressure type booster 50 according to the first embodiment of the present invention has a power piston 7 due to a pressure difference between two chambers (constant pressure chamber 9 and a transformation chamber 11). A communication portion 80 is formed for communicating between one of the two chambers 9 and 11 and the thick portion accommodating chamber 72 in the following state in which the movement is advanced. Specifically, as shown in FIG. 3, the communication portion 80 has the inner circumference of the front shell 1 in which the power piston 7 advances and a part of the diaphragm 5 is arranged on the forward side of the two shells 1 and 4. The constant pressure chamber 9 formed by the front shell 1 and the power piston 7 and the thick portion accommodating chamber 72 accommodating the thick portion 70 of the diaphragm 5 are communicated with each other in a state of being in contact with the surface 1b. .. Alternatively, with reference to FIG. 1, the communication portion 80 communicates with the center shell 4 and the power piston 8 in a state where the power piston 8 advances and a part of the diaphragm 6 is in contact with the inner peripheral surface of the center shell 4. The constant pressure chamber 10 formed by the above is communicated with the thick portion accommodating chamber 76 in which the thick portion 74 of the diaphragm 6 is accommodated.

As a result, in the airtight leak detection step performed after assembling the pressure booster 50, for example, a negative pressure is applied to the constant pressure chambers 9 and 10 with the atmospheric pressure introduced into the transformer chambers 11 and 12, and the constant pressure chamber 9 is applied. A pressure difference is generated between 10 and the transformer chambers 11 and 12, the power pistons 7 and 8 move forward, and a part of the diaphragms 5 and 6 becomes the inner peripheral surface 1b of the front shell 1 (center shell 4). Even in the abutted state, the constant pressure chambers 9 and 10 and the thick portion accommodating chambers 72 and 76 can communicate with each other. Therefore, if the folded portions of the diaphragms 5 and 6 are caught during the assembly of the atmospheric pressure type booster 50 and the airtight state of the constant pressure chambers 9 and 10 is not maintained, the above-mentioned airtight leakage detection step In the above, since a path is secured such that the constant pressure chambers 9 and 10 communicate with the outside of the housing 3 via the thick portion accommodating chambers 72 and 76, airtight leakage can be reliably detected. As a result, the accuracy of detecting the airtight leak of the atmospheric pressure type booster 50 can be improved, and the reliability can be improved.

Further, in the pressure type booster 50 according to the first embodiment of the present invention, as shown in FIGS. 2 and 3, when the communication portion 80 is the diaphragm 5 of the power piston 7 when the power piston 7 is advanced. It is a ridge portion 82 formed in a region of contact with the inner peripheral surface 1b of the front shell 1. As can be confirmed in FIG. 3, the convex portion 82 is in a direction orthogonal to the circumferential direction of the diaphragm 5 (parallel to the paper surface of FIG. 3) along the region where the diaphragm 5 abuts on the inner peripheral surface 1b of the front shell 1. (), And also projects toward the constant pressure chamber 9 side. Further, as shown in FIG. 1, the convex portion 82 as the communication portion 80 provided on the diaphragm 6 of the power piston 8 on the rear side has the diaphragm 6 with the inner peripheral surface of the center shell 4 when the power piston 8 advances. Along the abutting region, it extends in a direction orthogonal to the circumferential direction of the diaphragm 6 (a direction parallel to the paper surface of FIG. 1), and also projects toward the constant pressure chamber 10 side.

With the above configuration, in the airtight leakage detection process, a pressure difference is generated between the constant pressure chambers 9 and 10 and the transformer chambers 11 and 12, and the power pistons 7 and 8 move forward, and a part of the diaphragms 5 and 6 is formed. Is in contact with the inner peripheral surface 1b of the front shell 1 (center shell 4), but at least the parts of the diaphragms 5 and 6 located on both sides of the convex portion 82 in the extending direction are the parts of the front shell 1 (center shell 4). It is possible to form a passage that communicates between the constant pressure chambers 9 and 10 and the thick portion accommodating chambers 72 and 76 without contacting the inner peripheral surface 1b. Therefore, if the folded-back portions of the diaphragms 5 and 6 are in a state of being bitten, the airtight leak can be detected more reliably in the airtight leak detection step, and the reliability can be further improved. ..

Subsequently, FIG. 4 shows a front view of a single diaphragm 5 used in the atmospheric pressure type booster according to the second embodiment of the present invention. A feature of the diaphragm 5 is that the folded-back portion 78 is provided with a plurality of recessed portions 88 as communication portions 80 at intervals in the circumferential direction of the diaphragm 5. More specifically, these recessed portions 88 are provided in the region of the diaphragm 5 that comes into contact with the inner peripheral surface 1b of the front shell 1 in a state where the power piston 7 is advanced as shown in FIG. Further, each of the concave portions 88 is in a direction orthogonal to the circumferential direction of the diaphragm 5 along the region of the diaphragm 5 that comes into contact with the inner peripheral surface 1b of the front shell 1 when the power piston 7 is advanced (with the paper surface of FIG. 3). It is formed in a form extending in a parallel direction) and recessed toward the transformation chamber 11 side. Further, although not shown, a plurality of atmospheric pressure type boosters according to the second embodiment of the present invention are also provided in the diaphragm 6 of the power piston 8 as a communication portion 80 at intervals in the circumferential direction of the diaphragm 6. The concave portion 88 is provided. Each of these recesses 88 extends along the region of the diaphragm 6 that comes into contact with the inner peripheral surface of the center shell 4 when the power piston 8 advances, in a direction orthogonal to the circumferential direction of the diaphragm 6, and is a transformer chamber. It is formed in a recessed manner toward the 12 side.

With the above configuration, in the pressure type booster according to the second embodiment of the present invention, a pressure difference is generated between the constant pressure chambers 9 and 10 and the transformer chambers 11 and 12 in the airtight leakage detection step. Then, even if the power pistons 7 and 8 move forward and a part of the diaphragms 5 and 6 comes into contact with the inner peripheral surface 1b of the front shell 1 (center shell 4), the inner surface of the concave portion 88 is the front shell 1 (the front shell 1 (center shell 4). It is possible to form a passage that communicates between the constant pressure chambers 9 and 10 and the thick portion accommodating chambers 72 and 76 without contacting the inner peripheral surface 1b of the center shell 4). Therefore, similarly to the atmospheric pressure type booster 50 according to the first embodiment of the present invention in which the communication portion 80 is the convex portion 82, the folded portions and the like of the diaphragms 5 and 6 may be engaged. For example, the airtight leak can be detected more reliably in the airtight leak detection step, and the reliability can be further improved.

Further, FIGS. 5 and 6 show the periphery of the thick portion 70 of the diaphragm 5 in the state where the power piston 7 is advanced in the pressure type booster according to the third and fourth embodiments of the present invention. ing. First, in the atmospheric pressure type booster according to the third embodiment of the present invention shown in FIG. 5, a region of the inner peripheral surface 1b of the front shell 1 that comes into contact with the folded-back portion 78 of the diaphragm 5 when the power piston 7 advances. A ridge 90 is provided as a communication portion 80. The ridge 90 extends along the inner peripheral surface 1b of the front shell 1 in a direction orthogonal to the circumferential direction of the front shell 1 (direction parallel to the paper surface of FIG. 5) and faces the constant pressure chamber 9 side. It is formed in a protruding manner. Further, although not shown, the pressure type booster according to the third embodiment of the present invention is located on the inner peripheral surface of the center shell 4 in a region where the power piston 8 comes into contact with the folded portion of the diaphragm 6 when the power piston 8 is advanced. A ridge 90 is provided as a communication portion 80. The ridge portion 90 is formed so as to extend along the inner peripheral surface of the center shell 4 in a direction orthogonal to the circumferential direction of the center shell 4 and project toward the constant pressure chamber 10 side.

Next, in the atmospheric pressure type booster according to the fourth embodiment of the present invention shown in FIG. 6, the inner peripheral surface 1b of the front shell 1 comes into contact with the folded-back portion 78 of the diaphragm 5 when the power piston 7 advances. A concave portion 92 is provided in the region as a communication portion 80. The concave portion 92 extends along the inner peripheral surface 1b of the front shell 1 in a direction orthogonal to the circumferential direction of the front shell 1 (direction parallel to the paper surface of FIG. 6) and faces the outside of the housing 3. It is formed in a recessed manner. Further, although not shown, the atmospheric pressure type booster according to the fourth embodiment of the present invention is located on the inner peripheral surface of the center shell 4 in a region where the power piston 8 comes into contact with the folded portion of the diaphragm 6 when the power piston 8 is advanced. The concave portion 92 is provided as the communication portion 80. The recessed portion 92 is formed so as to extend along the inner peripheral surface of the center shell 4 in a direction orthogonal to the circumferential direction of the center shell 4 and to be recessed toward the outside of the housing 3.

The pressure type booster according to the third and fourth embodiments of the present invention having the above-described configuration has a pressure difference between the constant pressure chambers 9 and 10 and the transformer chambers 11 and 12 in the airtight leakage detection step. , And the power pistons 7 and 8 move forward, and even if a part of the diaphragms 5 and 6 comes into contact with the inner peripheral surface 1b of the front shell 1 (center shell 4), at least both sides of the convex portion 90 in the extending direction. The diaphragms 5 and 6 do not come into contact with the portion of the inner peripheral surface 1b of the front shell 1 (center shell 4) located at, or the concave portion 92 on the inner surface, and the constant pressure chambers 9 and 10 and the meat. A passage that communicates with the thick storage chambers 72 and 76 can be formed. Therefore, similarly to the atmospheric pressure type booster according to the first and second embodiments of the present invention, if the folded portions of the diaphragms 5 and 6 are in a state of being bitten, the airtightness is airtight in the airtight leakage detection step. Leakage can be detected more reliably, and reliability can be further improved.

Here, in each of the above-described embodiments, as the communication portions 80, the convex portions 82, 90 and the concave portions 88, 92 provided on the diaphragms 5, 6 and the shells 1 and 4 are the diaphragms 5, 6 and the shell 1. It is preferable to arrange them uniformly in the circumferential direction of No. 4, but they may be arranged at arbitrary positions. Further, the number of the convex portions 82, 90 and the concave portions 88, 92 may be plural or one for each of the diaphragms 5, 6 or the shells 1, 4. Further, as the communication portion 80, the convex portions 82 and 90 and the concave portions 88 and 92 may be present in one diaphragm 5 and 6 and the shells 1 and 4 at the same time. In addition, the length, width, height, depth, etc. of the convex portions 82, 90 and the concave portions 88, 92 are the thickness of the constant pressure chambers 9, 10 and the thickness of the convex portions 82, 90 and the concave portions 88, 92 with the power pistons 7 and 8 advanced. The size is set to an appropriate size so that a passage communicating with the storage chambers 72 and 76 can be secured.
In each embodiment, it is applied to a tandem type pressure booster provided with two power pistons 7 and 8, but naturally, it is applied to a pressure booster provided with one power piston. It is also possible.

As the atmospheric pressure type booster 50 based on the present embodiment described above, for example, the one described below can be considered.
The first aspect plots two chambers (9, 10, 11, 12) arranged between at least two shells (1, 2, 4) and the two shells (1, 2, 4). The thick portion (70, 74) including the power piston (7, 8) including the diaphragm (5, 6) and forming the outer edge of the diaphragm (5, 6) is the two shells (1). A pressure type booster (50) housed between the outer peripheral portions of 2, 2 and 4) and sealing the two chambers (9, 10, 11 and 12), and the power piston (7, 8). ) Advances and a part of the diaphragm (5, 6) becomes the inner peripheral surface (1b) of the shells (1, 4) arranged on the forward side of the two shells (1, 2, 4). One of the two chambers (9, 10, 11, 12) formed by the shell (1, 4) arranged on the forward side and the power piston (7, 8) in the abutted state. A communication portion (80) is formed for communicating between the chambers (9, 10) and the thick portion accommodating chamber (72, 76) in which the thick portion (70, 74) is accommodated. ..

In the second aspect, in the first aspect, the two chambers (9, 10, 11, 12) include the shell (1, 4) arranged on the forward side and the power piston (7, 8). The constant pressure chamber (9, 10) formed by the above two shells (1, 2, 4), the shells (2, 4) arranged on the opposite side of the two shells (1, 2, 4), and the power piston (7, 8). The plunger (25) arranged in the valve body (13) connected to the power piston (7, 8) in the transformation chamber (11, 12) formed by the input rod (24). By moving, the valve device (22) is opened to introduce the working gas into the transformation chambers (11, 12), and the working gas is introduced between the constant pressure chambers (9, 10) and the transformation chambers (11, 12). A pressure difference is generated, and the thrust generated in the power pistons (7, 8) due to the pressure difference is applied to the output rod (36) via the reaction member (35), and the output rod (36) is used as described. A pressure type booster (50) that transmits a part of the reaction force acting on the reaction member (35) to the input rod (24) via the plunger (25), and the communication portion (80) is a communication portion (80). , In the region of the diaphragm (5, 6) that comes into contact with the inner peripheral surface (1b) of the shell (1, 4) arranged on the forward side when the power piston (7, 8) advances. The ridges (82, 90) are formed so as to extend along the diaphragm (5, 6) in a direction orthogonal to the circumferential direction and project toward the constant pressure chamber (9, 10) side. ..

In the third aspect, in the second aspect, the ridge portion (82) is provided on the diaphragm (5, 6).
In the fourth aspect, in the second aspect, the ridge portion (90) is provided in the shell (1, 4) arranged on the forward side.

In the fifth aspect, in the first aspect, the two chambers (9, 10, 11, 12) include the shell (1, 4) arranged on the forward side and the power piston (7, 8). The constant pressure chamber (9, 10) formed by the above two shells (1, 2, 4), the shells (2, 4) arranged on the opposite side of the two shells (1, 2, 4), and the power piston (7, 8). The plunger (25) arranged in the valve body (13) connected to the power piston (7, 8) in the transformation chamber (11, 12) formed by the input rod (24). By moving, the valve device (22) is opened to introduce the working gas into the transformation chambers (11, 12), and the working gas is introduced between the constant pressure chambers (9, 10) and the transformation chambers (11, 12). A pressure difference is generated, and the thrust generated in the power pistons (7, 8) due to the pressure difference is applied to the output rod (36) via the reaction member (35), and the output rod (36) is used as described. A pressure type booster (50) that transmits a part of the reaction force acting on the reaction member (35) to the input rod (24) via the plunger (25), and the communication portion (80) is a communication portion (80). , In the region of the diaphragm (5, 6) that comes into contact with the inner peripheral surface (1b) of the shell (1, 4) arranged on the forward side when the power piston (7, 8) advances. It is a concave portion (88, 92) formed along the diaphragm (5, 6) in a direction orthogonal to the circumferential direction and recessed toward the transformation chamber (11, 12) side. ..

In the sixth aspect, in the fifth aspect, the concave portion (88) is provided in the diaphragm (5, 6).
In a seventh aspect, in the fifth aspect, the concave portion (92) is provided in the shell (1, 4) arranged on the forward side.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace other configurations with respect to a part of the configurations of each embodiment.

The present application claims priority based on Japanese Patent Application No. 2018-237558 filed on December 19, 2018. The entire disclosure, including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2018-237558 filed December 19, 2018, is incorporated herein by reference in its entirety.

1: Front shell, 1b: Inner peripheral surface, 2: Rear shell, 4: Center shell, 5, 6: Diaphragm, 7, 8: Power piston, 9, 10: Constant pressure chamber, 11, 12: Transformer chamber, 13: Valve Body, 22: Valve device, 24: Input rod, 25: Plunger, 35: Reaction member, 36: Output rod, 50: Atmospheric pressure booster, 70, 74: Thick part, 72, 76: Thick part accommodation Room, 78: Folded part, 80: Communication part, 82, 90: Convex part, 88, 92: Concave part

Claims (7)

It is a pressure type booster, and the pressure type booster is
At least two shells and
Arranged between the two shells to define two chambers, including a power piston with a diaphragm.
The thick portion forming the outer edge of the diaphragm is housed between the outer peripheral portions of the two shells to seal the two chambers.
The power piston is advanced and a part of the diaphragm is arranged on the advancing side of the two chambers in a state of being in contact with the inner peripheral surface of the shell arranged on the advancing side of the two shells. It is characterized in that a communication portion is formed for communicating between one of the chambers formed by the shell and the power piston and the thick portion accommodating chamber in which the thick portion is accommodated. Atmospheric pressure type booster. In the atmospheric pressure type booster according to claim 1,
The two chambers are formed by a constant pressure chamber formed by the shell arranged on the forward side and the power piston, and the shell arranged on the side opposite to the forward side of the two shells and the power piston. It is a transformer chamber that is formed,
By moving the plunger arranged in the valve body connected to the power piston by the input rod, the valve device is opened to introduce the working gas into the transformation chamber, and the constant pressure chamber and the transformation chamber are brought into contact with each other. A pressure difference is generated between them, and the thrust generated in the power piston by the pressure difference is applied to the output rod via the reaction member, and a part of the reaction force acting from the output rod to the reaction member is applied. It is transmitted to the input rod via the plunger.
The communication portion extends along the region of the diaphragm in contact with the inner peripheral surface of the shell arranged on the forward side when the power piston advances, in a direction orthogonal to the circumferential direction of the diaphragm. , A pressure type booster characterized by having a ridge portion formed in a manner of projecting toward the constant pressure chamber side. In the atmospheric pressure type booster according to claim 2.
The ridge portion is a pressure type booster provided on the diaphragm. In the atmospheric pressure type booster according to claim 2.
The pressure booster, wherein the ridge is provided on a shell arranged on the forward side. In the atmospheric pressure type booster according to claim 1,
The two chambers are formed by a constant pressure chamber formed by the shell arranged on the forward side and the power piston, and the shell arranged on the side opposite to the forward side of the two shells and the power piston. It is a transformer chamber that is formed,
By moving the plunger arranged in the valve body connected to the power piston by the input rod, the valve device is opened to introduce the working gas into the transformation chamber, and the constant pressure chamber and the transformation chamber are brought into contact with each other. A pressure difference is generated between them, and the thrust generated in the power piston by the pressure difference is applied to the output rod via the reaction member, and a part of the reaction force acting from the output rod to the reaction member is applied. It is transmitted to the input rod via the plunger.
The communication portion extends along the region of the diaphragm in contact with the inner peripheral surface of the shell arranged on the forward side when the power piston advances, in a direction orthogonal to the circumferential direction of the diaphragm. , A pressure type booster characterized by having a concave portion formed in a manner of being recessed toward the transformer chamber side. In the atmospheric pressure type booster according to claim 5,
The recessed portion is a pressure type booster provided on the diaphragm. In the atmospheric pressure type booster according to claim 5,
The pressure type booster characterized in that the concave portion is provided in a shell arranged on the forward side.

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