WO1998030805A1 - Cylindre pneumatique - Google Patents
Cylindre pneumatique Download PDFInfo
- Publication number
- WO1998030805A1 WO1998030805A1 PCT/JP1997/001174 JP9701174W WO9830805A1 WO 1998030805 A1 WO1998030805 A1 WO 1998030805A1 JP 9701174 W JP9701174 W JP 9701174W WO 9830805 A1 WO9830805 A1 WO 9830805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylinder
- air
- piston
- end wall
- air cylinder
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B21/00—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
- A63B21/008—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using hydraulic or pneumatic force-resisters
- A63B21/0085—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using hydraulic or pneumatic force-resisters using pneumatic force-resisters
- A63B21/0087—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using hydraulic or pneumatic force-resisters using pneumatic force-resisters of the piston-cylinder type
Definitions
- the present invention generally relates to an air cylinder, and more particularly, to an air cylinder in which fluctuations in cylinder internal pressure due to reciprocation of a piston within a predetermined stroke are suppressed to a small range.
- Air cylinders have been used in various mechanical devices for various purposes.
- One use of the air cylinder is to provide a substantially constant load or a load with a very small fluctuation range to the controlled device even when the position of the piston fluctuates.
- an air tank which is a simple means for keeping the internal pressure constant, is often used together with an air cylinder.
- This air tank is a pipe It is connected to the air cylinder on the road.
- an air tank is used, for example, when the internal pressure of the air cylinder is going to increase, the air in the air cylinder flows into the air tank via a pipeline. As a result, the internal pressure in the air cylinder is suppressed to a minimum. The solution with this air tank is not fully satisfactory.
- the present invention has been made in view of the above-described conventional circumstances, and does not require the cylinder length to be extended even if the cylinder diameter is slightly increased, and substantially reduces the cylinder internal pressure even if the piston moves within a predetermined stroke range.
- a novel configuration of an air cylinder that can be suppressed to be constant or kept to a minimum.
- the present invention provides the above air cylinder having a structure in which a surging phenomenon does not easily occur when the piston moves.
- the present invention provides the above-mentioned air cylinder which has a simple structure and can be manufactured at low cost.
- the present invention provides the above air cylinder, which applies a load to the controlled device when the piston is raised.
- the present invention provides the above air cylinder, which applies a load to the controlled device when the piston is depressed.
- the present invention provides an air cylinder having the following configuration.
- An air cylinder includes a cylinder body, a piston that reciprocates in the cylinder body, and a piston rod connected to the piston.
- the cylinder body includes an inner cylinder that accommodates the piston and the piston rod so as to slide back and forth, an outer cylinder that forms a double cylinder together with the inner cylinder, and first and second end walls that close both ends of the inner and outer cylinders.
- a communication means for communicating the inner and outer cylinder space with the inner cylinder space on the first end wall side on the first end wall side, and the second end wall has a pressure release chamber on the second end wall side in the inner cylinder. It has a release port for releasing
- the communication means may be a communication passage formed in the first end wall itself.However, usually, the communication means is constituted by one or two or more through holes formed near the first end wall of the inner cylinder, Alternatively, it is preferable to form the end of the inner cylinder on the first end wall side with an opening that is completely or partially cut away.
- an air cylinder of a type that applies a tensile load to a controlled device connected to the piston port When the piston rod penetrates the first end wall into and out of the first end wall, an air cylinder of a type that applies a tensile load to a controlled device connected to the piston port. On the other hand, the piston rod penetrates the second end wall in and out. In such a case, an air cylinder of a type that applies a pressing load to the controlled device is used.
- the setting of the initial pressure in the inner and outer cylinder spaces and the inner cylinder space is usually performed by pressure adjusting means including air supply means such as an air conditioner.
- pressure adjusting means including air supply means such as an air conditioner.
- the space between the inner cylinder and the outer cylinder, that is, the inner and outer cylinder space serves as a conventional air tank.
- the inner cylinder having the above configuration, the space between the inner cylinder and the outer cylinder, that is, the inner and outer cylinder space serves as a conventional air tank. Also, the inner cylinder
- the inner cylinder space and the inner and outer cylinder spaces do not need to be connected by a conduit as in the conventional case, but are directly connected via the opening of the inner cylinder, so that when the piston moves, There is an advantage that no phenomenon occurs.
- the object has been achieved by improving the structure of the air cylinder itself, other means such as a pipe and an air tank are not required, and the structure of the air cylinder itself is also a cylinder wall. Since the air cylinder has only a double structure, the air cylinder can be manufactured at low cost.
- FIG. 1 is a system diagram showing one application example of the air cylinder according to the first embodiment of the present invention.
- FIG. 2 is an enlarged sectional view of the air cylinder of FIG.
- FIG. 3 is a system diagram showing one application example of the air cylinder according to the second embodiment of the present invention.
- FIG. 4 is an enlarged sectional view of the air cylinder of FIG.
- FIG. 5 is an explanatory diagram used to explain the effect of the present invention.
- FIGS. 6 and 7 are comparative explanatory diagrams for comparatively explaining the effect of the conventional air cylinder having a longer cylinder length and the air cylinder according to the present invention.
- FIG. 1 and 2 show a first embodiment.
- the air cylinder 100 according to the first embodiment is applied to an athletic training device.
- Figure 1 shows only the main parts of the athletic training equipment, not details.
- An air cylinder 100 is also incorporated as a load for the training device.
- the upper end wall of the air cylinder 100 (first end wall) has a belt at the upper end of the piston rod 2 that projects upward from the center of One end 202a of 202 is fixed.
- the other end 202b of the belt 202 is fixed at a predetermined position on a cam peripheral surface 203a formed on the upper end of the swing arm 203 via a pulley 201.
- the swing arm 203 can rotate about the shaft 204 in the directions of arrows 205a and 205b.
- a kick bar 206 is provided at the lower end of the swing arm 203.
- the belt 202 is pulled and the piston rod 2 is pulled upward.
- a load corresponding to the internal pressure set in the air cylinder 100 is applied to the trainee's leg.
- the piston rod, and thus the arm 203 automatically returns to its original position.
- reference numerals 12, 13, 14, and 15 are for setting the initial pressure of the air cylinder 100
- reference numeral 12 indicates the connection between the air cylinder 100 and the air supply source 15, that is, the air compressor 15.
- Connected line, 14 is a switching valve that controls the supply of air
- 13 is a pressure gauge that indicates the system pressure.
- FIGS. 1 and 2 show an embodiment of an air cylinder of a type in which a load is generated when a force is applied in a direction in which the piston rod 2 is pulled out.
- the internal structure of the air cylinder will be described in detail with reference to FIG.
- the air cylinder 100 includes a cylinder body 1, a piston 3 that reciprocates in the cylinder body 1, and a piston rod 2 connected to the piston 3.
- the cylinder body 1 has an inner cylinder lb that accommodates the piston 3 and the piston rod 2 for reciprocating sliding, an outer cylinder la that forms a double cylinder together with the inner cylinder lb, and both ends of the inner and outer cylinders lb, la are closed.
- the upper end wall (first end wall) 4 and the lower end wall (second end wall) 5 are provided.
- the inner cylinder lb is composed of an inner and outer cylinder space 8 formed between the inner cylinder lb and the outer cylinder la, A communication means for communicating with the inner cylinder space 7 above the housing 3 is provided near the upper end wall 4. In the present embodiment, two or more large through holes 6 are formed in the inner cylinder lb as the communication means.
- a release port 11 for releasing the inner cylinder space below the piston 3, ie, the pressure release chamber 9, to the outside is formed.
- the piston rod 2 protrudes outward through the upper end wall 4 through the inner cylinder space 7 above the piston 3.
- An air supply / discharge port 10 is formed below the inner and outer cylindrical spaces 8 of the lower end wall 5. This port 10 is connected to one end of the pipe 12.
- reference numeral 16 denotes a 0 ring disposed between the members.
- the internal pressure of the air cylinder 100 having the above configuration is set in advance by the adjusting means. That is, the air compressor 15 is operated to supply compressed air into the air cylinder 100 from the port 10.
- the pressure gauge 13 indicates that the internal pressure of the air cylinder is the set initial pressure, for example, 6 kg / cm 2 , the switching valve 14 is closed and the operation of the air compressor 15 is stopped.
- the air in the inner cylinder space 7 is compressed by the piston 3 and tends to increase in pressure. Escapes from the through hole 6 and flows into the inner and outer cylindrical space 8. That is, the pressure increase in the inner cylinder space 8 is absorbed by the inner and outer cylinder spaces 8 in accordance with the capacity thereof, and the increase in the pressure in the inner cylinder space 8 is suppressed to a minimum. Therefore, the load on the leg of the kick bar 206 of the training device is substantially constant within the range of the swing angle of the swing arm 203, and the training device is very easy to operate. If the load rises linearly as kick bar 206 moves in the direction of arrow 205a, the load on the legs will also increase linearly, which means that Therefore, the arm cannot be moved, making it very difficult to use as a training device.
- FIG. 3 shows an application example of such an air cylinder 100.
- the reduction roll 207 attempts to reduce the pressure with a substantially constant pressure. is there.
- the air cylinder of the second embodiment differs from the first embodiment in that the piston rod 2 of the air cylinder 100 extends downward through the lower end wall 5.
- a bracket 210 is fixed to the lower end of the piston rod 2, and a pressing roll 207 is attached to the bracket 210.
- a fixed roll 208 is disposed to face the pressing roll 207.
- the two rubber sheets 211a and 211b to be bonded are supplied between the both ends 207 and 208 from the left side in the figure and are pressed by the pressing force of the rolls. After that, it is sent rightward by the transport roll 209.
- the air cylinder is substantially the same as the air cylinder of the first embodiment except that the piston rod 2 projects downward as described above.
- the through hole 6 of the inner cylinder lb has a small configuration. In short, the through hole only needs to be large enough to allow the air to flow smoothly between the inner cylinder space 7 and the inner and outer cylinder space 8. Therefore, the entire upper end of the inner cylinder lb may be cut out.
- the release ports 11 are formed on both sides of the lower end wall 5 of the biston rod 2.
- an air supply / discharge port 10 is formed in the upper end wall 4. However, it may be formed on the lower end wall 5 as in the first embodiment.
- the initial pressure in the cylinder is set first, as in the case of the first embodiment.
- the force in which the air in the inner cylinder space 7 is compressed or expanded in accordance with the movement ⁇ Since the compressed air in the cylinder space 7 moves into the inner and outer cylinder space 8, or the air in the inner and outer cylinder space 8 moves into the inner cylinder space 7, the fluctuation range of the pressure in the inner cylinder space 7 is Minimized. Therefore, the fluctuation range of the load applied to the rubber sheets 211a and 211b of the piston rod 7 is extremely small, and a substantially constant value can be maintained.
- FIG. 5 is a diagram for explaining the relationship between the stroke of the piston rod and the cylinder volume.
- Fig. 5 if the cylinder volume and internal pressure before movement of piston 3 are V1.P1, and the cylinder volume and internal pressure after piston movement are V2.P2,
- the cylinder inner diameter (inner diameter of the inner cylinder in Fig. 7) is 32 ⁇
- the piston movement stroke is 300mm
- the piston varies.
- Pressure is 10%.
- the cylinder volume, and thus the cylinder length is simply 11 times the moving stroke, that is, 3,300 mm.
- the total wall thickness of the air cylinder is 100 mm in consideration of the wall thickness of the piston, the diameter of the piston rod, and the wall thickness of the upper and lower end walls, the total length of the air cylinder is 3,400 ram. Is a long dimension that cannot be used.
- the inner diameter of the outer cylinder is 100 mm
- the outer diameter of the inner cylinder is 36 ram
- the inner diameter of the inner cylinder is 32 mm
- the cross-sectional area of the inner cylinder space is about 700 mm 2
- the cross-sectional area of the inner and outer cylinders is about 6832 ⁇ 2 .
- the movement stroke of the piston and 300 mm its cylinder moves volume is about 2, 100, 0 OOmm 3.
- the volume of the inner and outer cylinder space should be 10 times the cylinder moving volume. If calculate this, its volume becomes 2, 10 0, 000mm 3. If you calculate the cylinder length of the outer cylinder here,
- the cylinder length of the outer cylinder only needs to be 308 mm.
- the length should be at most 408 mra or more, and this cylinder length is a dimension that does not hinder actual use. Comparing this with the ordinary air cylinder in Fig. 6, it can be seen that the cylinder outer shape does not become more than three times and the cylinder length is less than one-eighth.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU23069/97A AU2306997A (en) | 1997-01-09 | 1997-04-04 | Air cylinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1997/000023 WO1997025107A1 (en) | 1996-01-11 | 1997-01-09 | Kicking type training apparatus |
JPPCT/JP97/00023 | 1997-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998030805A1 true WO1998030805A1 (fr) | 1998-07-16 |
Family
ID=14179912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/001174 WO1998030805A1 (fr) | 1997-01-09 | 1997-04-04 | Cylindre pneumatique |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2306997A (ja) |
WO (1) | WO1998030805A1 (ja) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108853882A (zh) * | 2018-08-31 | 2018-11-23 | 嘉兴路德汽车零部件有限公司 | 两个总成间作用力自动调整装置 |
AU2021102516B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102514B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102512B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102520B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102522B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102515B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102519B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102521B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102518B4 (en) * | 2021-05-12 | 2022-08-25 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS418839Y1 (ja) * | 1963-06-18 | 1966-04-27 | ||
JPS51135295U (ja) * | 1975-04-24 | 1976-11-01 |
-
1997
- 1997-04-04 AU AU23069/97A patent/AU2306997A/en not_active Abandoned
- 1997-04-04 WO PCT/JP1997/001174 patent/WO1998030805A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS418839Y1 (ja) * | 1963-06-18 | 1966-04-27 | ||
JPS51135295U (ja) * | 1975-04-24 | 1976-11-01 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108853882A (zh) * | 2018-08-31 | 2018-11-23 | 嘉兴路德汽车零部件有限公司 | 两个总成间作用力自动调整装置 |
AU2021102516B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102514B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102512B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102520B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102522B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102515B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102519B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102521B4 (en) * | 2021-05-12 | 2022-08-18 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
AU2021102518B4 (en) * | 2021-05-12 | 2022-08-25 | Caterpillar Inc. | Hydraulic cylinder with specific performance dimensions |
Also Published As
Publication number | Publication date |
---|---|
AU2306997A (en) | 1998-08-03 |
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