Pressurizing device

Abstract

Provided is a pressurizing device capable of pressurizing an acting body with a substantially constant force by means of a compact structure. The present invention is provided with: a pressure accumulation unit (10); and a pressure transmission body (4) that transforms the pressure of the pressure accumulation unit (10) and transmits the transformed pressure to an acting body (W).

Description

Technical Field

[0001] The present invention relates to a pressurizing device for pressurizing an acted object. Background Art

[0002] As a pressurizing device for pressurizing an acted object by utilizing the pressure of a fluid, a cylinder device is sometimes used. A piston moves in a cylinder in response to the pressure of the fluid, thereby pressurizing the acted object.

[0003] For example, the pressurizing device of Patent Document 1 includes a cylinder device, a pump, and an accumulator. When pressurized fluid is supplied from the pump or the accumulator to the cylinder device, the piston moves relatively in the cylinder to pressurize the acted object.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2021-20224 (page 5, Figure 1 ) Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in the pressurizing device of Patent Document 1, in order to pressurize the acted body with a substantially constant pressurizing force, it is necessary to supply an appropriate fluid to the cylinder at any time using a pump and an accumulator, which causes a problem of increasing the size of the pressurizing device.

[0009] The present invention has been made in view of such a problem, and an object of the present invention is to provide a pressurizing device capable of pressurizing an acted object with a substantially constant force with a compact structure.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, a pressurizing device according to the present invention includes: a pressure storage unit; and a pressure transmitting body that transforms the pressure of the pressure storage unit and transmits the transformed pressure to an acted object.

[0012] Thus, the pressure transmitting body transforms the pressure of the pressure storage unit and transmits it to the acted body, so that the change in the pressure applied to the acted body within the pressure transformation range of the pressure transmitting body can be reduced with a compact structure that does not use an accumulator or a pump.

[0013] The pressure accumulation unit may accumulate gas under pressure.

[0014] Thereby, the pressurizing device can be made lightweight.

[0015] The pressure transmitting body may be formed of a piston having a small diameter portion and a large diameter portion, the small diameter portion being inserted into a cylinder portion communicating with the pressure accumulating portion, and the large diameter portion being disposed on the side of the acted body.

[0016] Thus, the pressure acting on the pressure accumulation part in the small diameter portion is dispersed in the large diameter portion and transmitted to the acted body, so that the change in the pressure applied to the acted body within the stroke range of the piston can be reduced.

[0017] A guide body guided by the outer peripheral surface of the cylinder portion may be attached to the pressure transmitting body.

[0018] Thus, the pressure transmission body is guided in the moving direction by the small diameter portion inside the cylinder and the guide body outside the cylinder, so that the stroke of the pressure transmission body is stabilized.

[0019] The pressure accumulation portion may be formed of a cylinder-shaped gas chamber, and a diameter of the cylinder portion may be smaller than a diameter of the gas chamber.

[0020] Thus, the diameter of the cylinder portion is smaller than the diameter of the gas chamber, and therefore it is possible to suppress a sudden drop in the pressure of the pressure accumulating portion when the pressure transmitting body is in a stroke toward the acted body side.

[0021] The large diameter portion may be configured to be able to directly contact and separate from the acted object.

[0022] Thus, the large diameter portion can directly pressurize the acted object, that is, pressurize the acted object without intervening other members. Therefore, there is no concern about deformation of other members, and the amount of pressurization of the acted object is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a longitudinal sectional view showing the contracted state of the pressurizing device according to the first embodiment of the present invention.

[0024] Figure 2 This is a longitudinal sectional view showing the pressurizing device of Example 1 in an extended state.

[0025] Figure 3 This is a longitudinal sectional view showing a contracted state of a pressurizing device according to a second embodiment of the present invention.

[0026] Figure 4 This is a longitudinal sectional view showing the extended state of the pressurizing device of Example 2.

[0027] Figure 5 This is a longitudinal sectional view showing a contracted state of a pressurizing device according to a third embodiment of the present invention.

[0028] Figure 6 It is a longitudinal sectional view showing a contracted state of a pressurizing device according to a fourth embodiment of the present invention.

[0029] Figure 7 It is a perspective view showing the extended state of the pressurizing device according to the fifth embodiment of the present invention.

[0030] Figure 8 (a) is a longitudinal sectional view showing the contracted state of the pressurizing device of Example 5, Figure 8 (b) is a longitudinal sectional view showing the extended state of the pressurizing device of Example 5.

[0031] Fig. 9 It is a perspective view showing the extended state of the pressurizing device according to the sixth embodiment of the present invention. DETAILED DESCRIPTION

[0032] Hereinafter, a mode for implementing the pressurizing device of the present invention will be described based on examples.

[0033] Example 1

[0034] Reference Figure 1 and Figure 2 The pressurizing device of Example 1 is described below. Figure 1 The left side of the paper is used as the left side of the pressure device. Figure 1 The right side of the paper is explained as the right side of the pressurizing device.

[0035] like Figure 1 As shown, the pressurizing device 1 uses the pressure of the fluid to pressurize the object W. Assume that the object W of this embodiment is arranged on the right side of the pressurizing device 1 and the position of the pressurized surface W1 is axially Figure 1 The explanation is given by changing in the left and right directions of the paper.

[0036] The pressurizing device 1 mainly includes a housing 2 , a connecting body 3 as a cylinder portion, a piston 4 as a pressure transmitting body, and a cylindrical body 5 as a guide body.

[0037] The housing 2 is cylindrical. The diameter of the right end of the outer peripheral surface of the housing 2 is smaller than the diameter of the left end. That is, a step portion 2a serving as a movement restricting portion is formed annularly on the outer peripheral surface of the housing 2.

[0038] A cover member 6 is connected to the inner peripheral surface of the left end of the housing 2 in a sealed manner by screwing. The cover member 6 has a through hole 6a formed in the center. A bolt 7 is installed in the through hole 6a. In addition, the housing 2 and the cover member 6 may be formed integrally by the same member.

[0039] The connecting body 3 is in the shape of a stepped cylinder having a through hole 3A. The left end of the connecting body 3 is screwed and sealedly connected to the inner circumference of the right end of the housing 2. In addition, in this embodiment, the housing 2 and the connecting body 3 are illustrated as separate bodies, but they can also be formed integrally from the same parts.

[0040] On the outer peripheral surface 3b of the flange extending in the outer diameter direction at the right end of the connecting body 3, annular recesses 3c and 3d recessed in the inner diameter direction are provided axially separately. A sealing ring 8 is fitted in the right annular recess 3c. The left annular recess 3d is shallower than the annular recess 3c and does not fit the sealing ring 8.

[0041] The seal ring 8 is described using an O-ring as an example, but may also be an X-ring, a lip seal, etc. In addition, the annular recess 3d has an oil storage function to enable smooth sliding. In addition, the annular recess 3d may be provided at any position in the axial direction of the outer peripheral surface 3b of the flange as long as it can improve the sliding property.

[0042] The piston 4 has a large diameter portion 41 and a small diameter portion 42. The large diameter portion 41 is in the shape of a disk, and the small diameter portion 42 is in the shape of a column, extending from the center of the large diameter portion 41 toward the left.

[0043] The diameter L1 of the large diameter portion 41 is larger than the diameter L2 of the small diameter portion 42, and in this embodiment is approximately three times the diameter L2. In addition, the diameter L1 of the large diameter portion 41 only needs to be larger than the diameter L2 of the small diameter portion 42, and preferably, the diameter L1 of the large diameter portion 41 is approximately 2 to 5 times the diameter L2 of the small diameter portion 42.

[0044] The large diameter portion 41 has a flat right end face 41a. The end face 41a is configured to be able to directly contact and separate from the acted body W. In detail, the end face 41a can be in surface contact with the pressurized surface W1 of the acted body W. In addition, the end face 41a may be fixed to the pressurized surface W1 of the acted body W and move integrally with the acted body W.

[0045] The small diameter portion 42 is inserted into the through hole 3A of the connecting body 3 so as to be slidable relative to the inner peripheral surface 3a of the connecting body 3. Four annular recessed portions 42a to 42d recessed in the inner diameter direction are provided on the left side of the outer peripheral surface of the small diameter portion 42 and spaced apart in the axial direction.

[0046] The leftmost annular recess 42a and the third annular recess 42c from the left are formed shallower than the second annular recess 42b from the left and the rightmost annular recess 42d. In addition, a seal ring 9 is fitted in the annular recess 42b and the annular recess 42d, respectively. In addition, the seal ring 9 is not fitted in the annular recesses 42a and 42c.

[0047] The seal ring 9 is described using an X-ring as an example, but may also be an O-ring, a lip seal, etc. In addition, a plurality of seal rings 9 are arranged in the axial direction, specifically, two seal rings are arranged, so that oil is hardly leaked to the pressure storage unit 10, and the piston 4 is not easily tilted when the piston 4 moves.

[0048] Furthermore, the annular recessed portions 42a and 42c have a gas storage function and an oil storage function, and can prevent gas leakage and enable smooth sliding.

[0049] The seal ring 9 is slidable in the axial direction relative to the inner peripheral surface 3 a of the connection body 3 , and restricts the movement of the fluid in the axial direction.

[0050] The small diameter portion 42 is inserted into the through hole 3A of the connecting body 3, and the pressure storage portion 10 is formed on the left side of the pressurizing device 1. In detail, the pressure storage portion 10 is a space surrounded by the housing 2, the connecting body 3, the piston 4 and the cover member 6. The volume of the pressure storage portion 10 changes by the movement of the piston 4 as described later (see Figure 2 ).

[0051] High-pressure gas G is sealed in the pressure storage unit 10 from the outside through a gas introduction port (not shown) of the plug 7. In other words, the pressure storage unit 10 is a cylinder-shaped gas chamber.

[0052] The diameter D1 of the through hole 3A of the connecting body 3 is smaller than the diameter D2 of the pressure storage part 10, and in the present embodiment is about 1 / 3 times the diameter D2 (D1<D2). In addition, the diameter D1 of the through hole 3A only needs to be smaller than the diameter D2 of the pressure storage part 10, and preferably, the diameter D1 of the through hole 3A is about 1 / 2 to 1 / 5 times the diameter D2 of the pressure storage part 10.

[0053] The right end of the cylindrical body 5 is screwed and sealedly connected to the outer peripheral surface of the large diameter portion 41, and the cylindrical body 5 is integrated with the piston 4. The right end surface of the cylindrical body 5 is arranged to be roughly coplanar with the end surface 41a on the right side of the large diameter portion 41 or arranged at a position closer to the left side than the end surface 41a. Thus, the cylindrical body 5 does not hinder the end surface 41a of the large diameter portion 41 from contacting the surface of the pressurized surface W1 of the body W to be acted on.

[0054] The inner circumferential surface 5a of the cylindrical body 5 is slidable in the axial direction relative to the outer circumferential surface 3b of the right end of the connecting body 3. Between the inner circumferential surface 5a of the cylindrical body 5 and the outer circumferential surface 3b of the connecting body 3, the seal ring 8 restricts the movement of the fluid in the axial direction.

[0055] On the right side of the pressurizing device 1, the connecting body 3, the large diameter portion 41 and the small diameter portion 42 of the piston 4, and the cylindrical body 5 constitute a space 11. Oil F as a lubricating fluid is retained in the space 11. The volume of the space 11 changes by the movement of the piston 4 as described later (see Figure 2).

[0056] A breathing hole 51 is formed in the upper right portion of the cylindrical body 5. That is, the space 11 communicates with the external air space through the breathing hole 51.

[0057] When the piston 4 and the cylindrical body 5 move to the leftmost position, in other words, when the cylindrical body 5 is inserted deepest into the connecting body 3, the end 5b contacts the step 2a of the housing 2.

[0058] Next, use Figure 1 and Figure 2 The contracted state and the extended state of the pressurizing device 1 will be described. The housing 2 is fixed to a fixed body (not shown) and is immobile at least in the axial direction, that is, in the left-right direction.

[0059] like Figure 1 As shown, when the acted body W is arranged at the leftmost position, the piston 4 and the cylindrical body 5 are in the contracted state of the pressurizing device 1, where they have moved to the leftmost position. In the contracted state of the pressurizing device 1, the left end 5b of the cylindrical body 5 abuts against the step 2a of the housing 2, and the movement of the piston 4 and the cylindrical body 5 to the left is restricted.

[0060] In the contracted state of the pressurizing device 1, the volume of the pressure accumulator 10 becomes minimum within the stroke range of the piston 4, and the gas G is compressed to the maximum. The gas G is restricted from moving to the right space 11 by the seal rings 9, 9. In addition, the annular recesses 42a, 42c function as gas storage portions, and leakage of the gas G can be effectively suppressed.

[0061] The pressure of the gas G in the pressure accumulator 10 acts on the left surface 42e of the small diameter portion 42 (see arrow L10). The pressure of the gas G acting on the left surface 42e of the small diameter portion 42 is transmitted to the acted body W as a stress dispersed in the large diameter portion 41 (see arrow L20).

[0062] Furthermore, in the contracted state of the pressurizing device 1, the breathing hole 51 of the tubular body 5 is arranged on the right side of the connecting body 3. That is, the breathing hole 51 is not closed.

[0063] Furthermore, a water-repellent air-permeable sheet 51 s is provided to block the breathing hole 51 , thereby preventing water from entering the space 11 from the outside and allowing gas to flow.

[0064] The liquid level of the oil F is located near the bottom of the breathing hole 51. Thus, the oil F is supplied to the gap between the outer peripheral surface of the small diameter portion 42 of the piston 4 and the inner peripheral surface 3a of the connecting body 3, and the oil F does not leak from the breathing hole 51 into the air space.

[0065] like Figure 2As shown, when the position of the pressurized surface W1 of the acted body W is configured at the rightmost position, the piston 4 and the cylindrical body 5 are moved to the rightmost extended state of the pressurizing device 1. In the extended state of the pressurizing device 1, the left end 5b of the cylindrical body 5 abuts against the step 3e of the connecting body 3, and the movement of the piston 4 and the cylindrical body 5 to the right is restricted.

[0066] When the pressurizing device 1 is in the extended state, the volume of the pressure accumulator 10 becomes maximum within the stroke range of the piston 4, and the pressure of the gas G is reduced.

[0067] Furthermore, in the extended state of the pressurizing device 1, the breathing hole 51 moves to the right side away from the connecting body 3 compared to the contracted state of the pressurizing device 1, so the breathing hole 51 is not closed. Furthermore, the liquid level of the oil F is located below the through hole 3A of the connecting body 3.

[0068] From Figure 1 The contracted state of the pressurizing device 1 is toward Figure 2 The description is made when the piston 4 moves to the right while the pressurizing device 1 is in the extended state. Since the diameter D1 of the through hole 3A of the connecting body 3 is smaller than the diameter D2 of the pressure accumulating part 10, and the pressure of the gas G acting on the left surface 42e of the small diameter part 42 is dispersed into small stresses at the large diameter part 41 and transmitted to the acted body W, the pressure of the gas G is prevented from dropping sharply as the piston 4 moves to the right.

[0069] In other words, as the piston 4 moves to the right, the pressure of the gas G slowly decreases, so that the change in the pressure applied to the object W within the stroke range of the piston 4 can be reduced. Therefore, even if the fluid is not supplied from the outside through an accumulator or a pump, the object W can be pressurized with a substantially constant force within the stroke range of the piston 4, so that the pressurizing device 1 can be compactly constructed. That is, the diameter D1 is smaller than the diameter D2, and within the stroke range of the piston 4, the pressure of the small diameter portion 42 does not change sharply, and the high pressure is maintained. Because it is a high pressure, the required volume of the pressure storage unit 10 can be smaller than the case where the gas G is at a low pressure (the same pressure as the space portion 11, etc.).

[0070] Furthermore, the stroke of the piston 4 is smoothed by the oil F supplied to the gap between the outer peripheral surface of the small diameter portion 42 of the piston 4 and the inner peripheral surface 3a of the connecting body 3. In addition, a part of the oil F remaining in the gap between the outer peripheral surface of the small diameter portion 42 and the inner peripheral surface 3a of the connecting body 3 flows into the annular recessed portions 42a, 42c, which contributes to the lubricity of the stroke of the piston 4.

[0071] When the cylindrical body 5 moves to the left as described later, the oil F in the space 11 enters the gap between the outer peripheral surface 3b of the connecting body 3 and the inner peripheral surface 5a of the cylindrical body 5, and the movement of the cylindrical body 5 becomes smooth due to the oil F remaining in the gap.

[0072] Furthermore, the piston 4 is guided in the moving direction by the small diameter portion 42 inside the connecting body 3 and the cylindrical body 5 outside the connecting body 3, so the stroke of the piston 4 is stabilized. Thus, when the end face 41a of the large diameter portion 41 is in surface contact with the pressurized surface W1 of the acted body W, the acted body W can be pressurized straight to the right by the piston 4, so that the load on the acted body W can be prevented.

[0073] And, in Figure 2 The extended state of the pressurizing device 1 is toward Figure 1 When the piston 4 moves to the left side in the contracted state of the pressurizing device 1 , the pressure of the gas G increases according to the diameter of the small-diameter portion 42 as the piston 4 moves to the left side.

[0074] In other words, as the piston 4 moves to the left, although the pressure of the gas G is slightly pressurized according to the diameter of the small-diameter portion 42, the gas pressure does not change rapidly to become a high-pressure state, so the stroke amount of the piston 4 can be ensured even if the gas G is not discharged to the outside.

[0075] Furthermore, the stroke of the piston 4 can be smoothly performed by utilizing the oil F remaining in the gap between the outer peripheral surface of the small diameter portion 42 and the inner peripheral surface 3 a of the connecting body 3 .

[0076] When the volume of the space 11 gradually decreases and the liquid level of the oil F reaches the through hole 3A of the connecting body 3 , the oil F is supplied to the gap between the outer peripheral surface of the small diameter portion 42 of the piston 4 and the inner peripheral surface 3 a of the connecting body 3 .

[0077] Furthermore, the oil F in the space 11 enters the gap between the outer peripheral surface 3b of the connecting body 3 and the inner peripheral surface 5a of the cylindrical body 5, and the movement of the cylindrical body 5 also becomes smooth. A part of the oil F remaining in the gap between the outer peripheral surface 3b of the connecting body 3 and the inner peripheral surface 5a of the cylindrical body 5 flows into the annular recess 3d, which contributes to the lubricity of the stroke of the cylindrical body 5.

[0078] Furthermore, since the breathing hole 510 is not closed by the piston 4 throughout the entire stroke range of the piston 4 , it is possible to prevent the pressure in the space portion 11 from rising, and the stroke of the piston 4 can be performed stably.

[0079] As described above, the piston 4 transforms the pressure of the pressure storage unit 10 and transmits it to the object W. Therefore, the change in the pressure applied to the object W within the transformation range of the piston 4 can be reduced by a compact structure that does not use an accumulator or a pump.

[0080] Specifically, the piston 4 has a large diameter portion 41 and a small diameter portion 42, the small diameter portion 42 is inserted into the through hole 3A of the connecting body 3, and the large diameter portion 41 is arranged on the side of the acted body W. As a result, the pressure of the pressure accumulator 10 acting on the small diameter portion 42 is dispersed in the large diameter portion 41 and transmitted to the acted body W, so that the change in the pressure applied to the acted body W within the stroke range of the piston 4 can be reduced.

[0081] Furthermore, the pressure accumulation unit 10 accumulates the gas G. Thus, since the gas G as a gas is sealed in the pressure accumulation unit 10 , the pressurizing device 1 can be made lightweight.

[0082] Furthermore, since the piston 4 is guided in the moving direction by the small diameter portion 42 inside the connecting body 3 and the cylindrical body 5 outside the connecting body 3 , the stroke of the piston 4 is stabilized.

[0083] Furthermore, since the diameter D1 of the through hole 3A of the connecting body 3 is smaller than the diameter D2 of the pressure accumulation portion 10 , it is possible to prevent the pressure of the gas G from being rapidly reduced as the piston 4 moves to the right.

[0084] Furthermore, since the large diameter portion 41 is disposed so as to be directly contactable with and separable from the acted object W, the large diameter portion 41 can directly pressurize the acted object W, and thus the amount of pressurization of the acted object W is stabilized.

[0085] Furthermore, since the cylindrical body 5 is attached to the large diameter portion 41 and extends to the left in parallel along the small diameter portion 42 , the entire length of the pressurizing device 1 is short and compact.

[0086] Example 2

[0087] Next, refer to Figure 3 and Figure 4 The pressurizing device of Example 2 will be described. In addition, description of the same structure as that of the above-mentioned Example 1 will be omitted.

[0088] like Figure 3 As shown, in the pressurizing device 100 of the second embodiment, the left end of the cylindrical body 50 is connected to the right end of the connecting body 30 in a sealed manner by screwing. Alternatively, the connecting body 30 and the cylindrical body 50 may be integrally formed of the same member.

[0089] The breathing hole 510 of the cylindrical body 50 is provided at the upper left side of the cylindrical body 50 and is closed by a water-repellent air-permeable sheet 510s. In addition, a ring-shaped cover 520 is attached to the right end of the cylindrical body 50.

[0090] The piston 40 has a large diameter portion 410, a small diameter portion 420, and a middle diameter portion 430. The middle diameter portion 430 is cylindrical and extends from the center of the large diameter portion 410 toward the right. The diameter of the middle diameter portion 430 is smaller than that of the large diameter portion 410 and larger than that of the small diameter portion 420.

[0091] The middle diameter portion 430 is inserted into the through hole 520A of the cover body 520. At the right end of the middle diameter portion 430, a locking member 12 as a movement restricting portion having a U-shape in cross-sectional view is arranged on the right side of the cover body 520.

[0092] The flat right surface 12 a of the locking member 12 is in contact with the pressurized surface W1 of the object W being acted upon.

[0093] exist Figure 3 In the contracted state of the pressurizing device 100 shown, the locking member 12 is in contact with the cover body 520, and the movement of the piston 40 to the left is restricted.

[0094] Furthermore, the breathing hole 510 of the cylindrical body 50 is arranged on the left side of the large diameter portion 410 of the piston 40 .

[0095] Furthermore, since the liquid level of the oil F is located above the through hole 30A of the connection body 30 , the oil F can be supplied to the gap between the small diameter portion 420 and the connection body 30 .

[0096] exist Figure 4 In the extended state of the pressurizing device 100 shown, the piston 40 moves to the right compared to the contracted state of the pressurizing device 100 , so the breathing hole 510 is not closed by the large diameter portion 410 of the piston 40 .

[0097] That is, the breathing hole 510 is not closed within the entire stroke range of the piston 40 , and thus it is possible to prevent the pressure in the space portion 110 from increasing due to the stroke of the piston 40 .

[0098] Furthermore, when the piston 40 moves left and right, the oil F enters the gap between the inner peripheral surface of the cylindrical body 50 and the outer peripheral surface of the large diameter portion 410 , thereby enabling the stroke of the piston 40 to proceed smoothly.

[0099] Example 3

[0100] Next, refer to Figure 5 The pressurizing device of Example 3 will be described. In addition, description of the same structure as that of the above-mentioned Example 1 will be omitted.

[0101] like Figure 5 As shown, the pressurizing device 200 of the third embodiment mainly includes a housing 220 as a cylinder portion, a piston 240 as a pressure transmitting body, a cylindrical body 250 as a guide body, and a cover member 260 .

[0102] The housing 220 includes an outer diameter side cylindrical portion 221 , an inner diameter side cylindrical portion 222 , and a bottom portion 223 .

[0103] The outer diameter side cylindrical portion 221 has a diameter larger than that of the inner diameter side cylindrical portion 222 , and is disposed at a position separated from the inner diameter side cylindrical portion 222 toward the outer diameter side.

[0104] The inner diameter side cylindrical portion 222 is concentric with the outer diameter side cylindrical portion 221 when viewed in the axial direction. The inner diameter side cylindrical portion 222 is shorter than the outer diameter side cylindrical portion 221 in the axial direction.

[0105] The bottom portion 223 connects the right end of the outer diameter side cylindrical portion 221 and the right end of the inner diameter side cylindrical portion 222. The bottom portion 223 extends in the radial direction perpendicular to the central axes of the outer diameter side cylindrical portion 221 and the inner diameter side cylindrical portion 222.

[0106] The left end of the housing 220 is open to the left. The space between the outer diameter side cylindrical portion 221 and the inner diameter side cylindrical portion 222 at the right end of the housing 220 is closed by the bottom 223. The inner diameter side of the inner diameter side cylindrical portion 222 of the housing 220 is a through space.

[0107] The cover member 260 is connected to the left end of the outer diameter side cylindrical portion 221 in a sealed manner. The plug 270 is attached to the through hole 260 a of the cover member 260 .

[0108] As described above, the inner diameter side cylindrical portion 222 is shorter than the outer diameter side cylindrical portion 221 in the axial direction. When the cover member 260 is connected to the outer diameter side cylindrical portion 221, the left end of the inner diameter side cylindrical portion 222 is arranged at a position separated from the cover member 260 to the right.

[0109] The piston 240 has a large diameter portion 241 and a small diameter portion 242. The small diameter portion 242 is cylindrical, and the right end of the small diameter portion 242 is closed by the large diameter portion 241.

[0110] The space between the outer diameter side cylindrical portion 221 and the inner diameter side cylindrical portion 222 of the housing 220, the space between the inner diameter side cylindrical portion 222 and the cover member 260, and the internal space of the small diameter portion 242 of the piston 240 form a connected space, which is the pressure storage portion 210 in which the high-pressure gas G is sealed.

[0111] The pressure of the gas G in the pressure accumulation unit 210 acts on the bottom surface 242a of the small diameter portion 242 (see arrow L30). The pressure of the gas G acting on the bottom surface 242a of the small diameter portion 242 is transmitted to the acted object W as a stress dispersed in the large diameter portion 241 (see arrow L40).

[0112] Thus, the pressure of the gas G in the pressure storage unit 210 does not change rapidly as the piston 240 moves in the axial direction, and thus it is possible to reduce the change in the pressure applied to the object W within the stroke range of the piston 240. Therefore, even if a fluid is not supplied from the outside through an accumulator or a pump, the object W can be pressurized with a substantially constant force within the stroke range of the piston 240, and thus the pressurizing device 200 can be constructed compactly.

[0113] Furthermore, since the internal space of the small diameter portion 242 of the piston 240 can be used as the pressure accumulation portion 210 , the pressurizing device 200 can be configured compactly.

[0114] Furthermore, since the space between the outer diameter side cylindrical portion 221 and the inner diameter side cylindrical portion 222 of the housing 220 is arranged on the outer diameter side of the internal space of the small diameter portion 242 of the piston 240 and the two spaces overlap in the radial direction, the pressurizing device 200 can be made compact in the axial direction.

[0115] Example 4

[0116] Next, refer to Figure 6 The pressurizing device of Example 4 will be described. In addition, description of the same structure as that of the above-mentioned Example 3 will be omitted.

[0117] like Figure 6 As shown in the figure, the pressurizing device 300 of the fourth embodiment is provided with an annular recess 361 in the cover member 360. The annular recess 361 expands the space between the outer diameter side cylindrical portion 321 and the inner diameter side cylindrical portion 322 of the housing 320 to the left. In addition, the inner diameter portion of the annular recess 361 is arranged at a position closer to the inner diameter side than the inner peripheral surface of the small diameter portion 342 of the piston 340. In addition, a cover 362 covering the end surface of the cover member 360 is provided on the left side of the cover member 360.

[0118] In this way, the pressure accumulation portion 310 can be expanded by utilizing the annular recessed portion 361 provided in the cover member 360 , and thus the axial dimensions of the housing 320 and the piston 340 can be made compact.

[0119] Furthermore, since the inner diameter portion of the annular recess 361 is disposed on the inner diameter side relative to the inner peripheral surface of the small diameter portion 342 of the piston 340 , the gas G moves smoothly between the annular recess 361 and the inner space of the small diameter portion 342 .

[0120] Example 5

[0121] Next, refer to Figure 7 and Figure 8 The pressurizing device of the fifth embodiment is described. In addition, the description of the same structure as the fourth embodiment is omitted. Figure 8The through hole 260a and the plug 270 are omitted.

[0122] like Figure 7 and Figure 8 As shown in (a) and (b), the pressurizing device 400 of Example 5 mainly includes a pair of shells 420A, 420B as cylinder parts, a pair of pistons 440A, 440B, a pair of cylindrical bodies 450A, 450B as guide bodies, and a pair of cover parts 460A, 460B as pressure transmission bodies.

[0123] The housing 420A has substantially the same shape as the housing 320 of Example 4, and includes an outer diameter side cylindrical portion 421A, an inner diameter side cylindrical portion 422A, and a bottom portion 423A. The housing 420B also includes an outer diameter side cylindrical portion 421B, an inner diameter side cylindrical portion 422B, and a bottom portion 423B.

[0124] The piston 440A has substantially the same shape as the piston 340 of Example 4, and has a large diameter portion 441A and a small diameter portion 442A. The piston 440B also has a large diameter portion 441B and a small diameter portion 442B.

[0125] The large diameter portions 441A and 441B are provided with through holes 443A and 443B penetrating in the axial direction.

[0126] The left end of the cylindrical body 450A is fixed to the outer peripheral surface of the large diameter portion 441A of the piston 440A. The right end of the cylindrical body 450B is fixed to the outer peripheral surface of the large diameter portion 441B of the piston 440B.

[0127] The cover member 460A is connected to the opening side end (i.e., the right end) of the outer diameter side cylindrical portion 421A of the housing 420A in a sealing manner, and a cover 462A is provided at the end (i.e., the right end) of the cover member 460A on the side of the acted body WA. The cover member 460B is connected to the opening side end (i.e., the left end) of the outer diameter side cylindrical portion 421B of the housing 420B in a sealing manner, and a cover 462B is provided at the end (i.e., the left end) of the cover member 460B on the side of the acted body WB.

[0128] These housings 420A, 420B, pistons 440A, 440B, cylindrical bodies 450A, 450B, cover members 460A, 460B, and covers 462A, 462B are unitized. Specifically, the facing surfaces of the large diameter parts 441A, 441B of the pistons 440A, 440B are connected to each other. The through holes 443A, 443B of the large diameter parts 441A, 441B are connected. In addition, in order to reliably prevent the leakage of the high-pressure gas G, it is preferred that an annular gasket is arranged around the through holes 443A, 443B.

[0129] The internal spaces of the housings 420A and 420B closed by the cover members 460A and 460B and the internal spaces of the pistons 440A and 440B constitute a pressure storage unit 412 in which the high-pressure gas G is sealed.

[0130] Oil F as lubricating fluid is retained in space 411A outside housing 420A and piston 440A closed by cylindrical body 450A. Oil F as lubricating fluid is retained in space 411B outside housing 420B and piston 440B closed by cylindrical body 450B.

[0131] The pressurizing device 400 is provided with the acted bodies WA and WB on the left and right. The cover member 460A is fixedly connected to the acted body WA via the cover 462A, and the cover member 460B is fixedly connected to the acted body WB via the cover 462B. In the fifth embodiment, the housings 420A and 420B and the cylindrical bodies 450A and 450B are not fixed to the fixed body and can move freely.

[0132] Figure 8 (a) shows the contracted state of the pressurizing device 400, Figure 8 (b) shows the extended state of the pressurizing device 400. In this way, the acted bodies WA and WB can be pressurized over a long range in the axial direction.

[0133] Furthermore, as described above, the shells 420A, 420B and the cylindrical bodies 450A, 450B are not fixed to the fixed body, so that in states other than the contracted state and the extended state of the pressurizing device 400, the shells 420A, 420B and the pistons 440A, 440B move in accordance with the positions of the pressurized surfaces WA1, WB1 of the acted bodies WA, WB.

[0134] For example, when the pressurized surface WA1 of the acted body WA moves from the contracted state of the pressurizing device 400 , the housing 420A, the pistons 440A and 440B, and the cylindrical bodies 450A and 450B move.

[0135] In this way, since the pistons 440A and 440B and the cylindrical bodies 450A and 450B are movable, it is possible to cope with a situation where the axial position of the acted bodies WA and WB changes.

[0136] Furthermore, regarding the pressure storage section 412 of the present embodiment 5, the internal spaces of the left and right shells 420A, 420B and the internal spaces of the left and right pistons 440A, 440B are connected, and the volume is increased compared to the pressure storage section 210 of the embodiment 3. Therefore, it is possible to suppress the change of the pressure in the pressure storage section 412 caused by the expansion and contraction of the pressurizing device 400, and to pressurize the acted bodies WA, WB with high precision.

[0137] Alternatively, the through holes 443A and 443B may be closed with plugs so that the internal spaces of the housings 420A and 420B and the internal spaces of the left and right pistons 440A and 440B are not communicated with each other.

[0138] In the fifth embodiment, a method of applying pressure to two acted bodies WA and WB using one pressurizing device 400 is exemplified, but the present invention is not limited thereto, and one acted body may be pressurized using a plurality of pressurizing devices.

[0139] Example 6

[0140] Next, refer to Fig. 9 The pressurizing device of Example 6 will be described. In addition, the description of the same structure as that of the above-mentioned Example 5 will be omitted.

[0141] like Fig. 9 As shown, the pressurizing device 500 of the sixth embodiment includes a fixing plate 550 fixed to the outer peripheral surface of the large diameter portion 541 of the pair of pistons 540 (only one side is shown in the figure) and extending toward the outer diameter side.

[0142] The fixing plate 550 is fixed to the fixed body. Thus, even if the expansion and contraction amplitudes of the acted bodies WA' and WB' are different, the piston 540 does not move in the axial direction, and thus the acted bodies WA' and WB' can be pressurized stably.

[0143] As mentioned above, although the embodiment of the present invention is described with reference to the drawings, the specific structure is not limited to these embodiments, and the change and addition within the range which does not deviate from the summary of the present invention are also included in the present invention.

[0144] For example, in the aforementioned embodiments 1 to 6, the pressure transmitting body is illustrated as a piston, but it may also be a structure that transforms the pressure of the pressure storage unit and transmits it to the acted body, for example, a pressure transmitting body that receives the pressure of the pressure storage unit and deforms itself, thereby transforming the pressure and transmitting it to the acted body.

[0145] Furthermore, in the above-mentioned Embodiments 1 to 6, the mode in which the gas is pressurized in the pressure accumulation section is exemplified, but a liquid such as oil or a mixture of liquid and gas may be sealed in the pressure accumulation section.

[0146] Furthermore, in the above-mentioned embodiments 1 to 6, the stroke of the piston is guided by the outer circumference of the cylindrical body and the cylinder, but the present invention is not limited thereto, and the guide body can be freely changed. For example, a guide hole can be provided in the cylinder, and a guide pin can be provided in the piston, and the stroke of the piston can be guided by the guide hole and the guide pin sliding in the stroke direction.

[0147] Furthermore, the cylindrical body is not necessarily provided, and the structure may be formed only by the guidance of the cylinder part and the small diameter part.

[0148] Furthermore, in the above-mentioned embodiments 1, 3 to 6, the large diameter portion of the piston is in direct contact with the acted body, but other components may be interposed between the large diameter portion of the piston and the acted body.

[0149] Furthermore, in the above-mentioned embodiments 1 and 2, the breathing holes 51 and 510 are provided in the cylindrical bodies 5 and 50, but it is also possible that the breathing holes 51 and 510 are not provided and the pressure change of the space portion 11 is also utilized in addition to the pressure change of the pressure storage portion 10.

[0150] Furthermore, in the aforementioned embodiments 1 and 2, the annular recesses 3d and 42a and 42c are illustrated as spaces for storing fluid, but a component having a bearing function, a component for improving lubricity, or a component for suppressing eccentricity may be inserted into the space.

[0151] Furthermore, in the above-mentioned embodiments 1 and 2, the small diameter portion 42, 420 of the piston 4, 40 is illustrated as being solid, but a recessed portion recessed from the left end to the right side may be formed in the small diameter portion 42, 420. In this case, the volume of the pressure storage portion can be ensured to be larger.

[0152] Description of symbols

[0153] 1: pressurizing device; 2a: step portion (movement limiting portion); 3: connecting body (cylinder portion); 4: piston (pressure transmitting body); 5: cylindrical body (guide body); 10: pressure storage portion; 11: space portion; 12: locking component (movement limiting portion); 30: connecting body (cylinder portion); 40: piston (pressure transmitting body); 41: large diameter portion; 42: small diameter portion; 50: cylindrical body (guide body); 51: breathing hole; 100: pressurizing device; 110: space portion; 410: large diameter portion; 420: small diameter portion; 430: middle diameter portion; 510: breathing hole; F: oil; G: gas; W: acted body.

Claims

1. A pressurizing device, comprising: a pressure accumulator; and The pressure transmitting body transforms the pressure of the pressure accumulating part and transmits the transformed pressure to the acted body.

2. The pressurizing device according to claim 1, wherein: The pressure accumulation unit accumulates gas under pressure.

3. The pressurizing device according to claim 2, wherein: The pressure transmitting body is composed of a piston having a small diameter portion and a large diameter portion. The small diameter portion is inserted into the cylinder portion communicating with the pressure storage portion. The large diameter portion is arranged on the side of the acted body.

4. The pressurizing device according to claim 3, wherein: A guide body guided by the outer peripheral surface of the cylinder portion is attached to the pressure transmitting body.

5. The pressurizing device according to claim 3 or 4, wherein: The pressure storage unit is composed of a cylinder-shaped gas chamber, and the diameter of the cylinder is smaller than the diameter of the gas chamber.

6. The pressurizing device according to claim 3, wherein: The large diameter portion is configured to be able to directly contact and separate from the acted object.

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