JP3612184B2 - Hydraulic actuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic actuator that performs processing such as drilling and cutting of a workpiece such as a steel material between a movable processing tool and a fixed processing tool using hydraulic pressure. The present invention relates to a hydraulic actuator in which supply means for supplying oil into a cylinder chamber is provided in a head frame in order to prevent generation of negative pressure in a hydraulic circuit of a tool during movement.
[0002]
[Prior art]
Conventionally, as this type of hydraulic actuator, as described in Japanese Utility Model Laid-Open No. 4-122494, Japanese Utility Model Laid-Open No. 3-19621, Japanese Utility Model Publication No. 5-36568, etc., a cylinder chamber and a hydraulic pump are used. A communicating hole is formed in the head frame, and a flexible air bag whose inside is opened to the atmosphere is attached to the hole, and the outer periphery of the air bag and the inner peripheral surface of the hole What comprises the supply means is well-known.
[0003]
In the hydraulic actuator described in the publication, when the movable processing tool moves to the fixed processing tool side, the air bag expands so that the oil in the accommodation hole is sent into the cylinder chamber via the hydraulic pump, and the hydraulic circuit in the hydraulic circuit The movable processing tool was moved while preventing the generation of negative pressure.
[0004]
Further, as described in Japanese Utility Model Publication No. 3-15018, etc., a hole communicating with the cylinder chamber via a hydraulic pump is formed in the head frame, and an oil replenishing piston that slides on the inner peripheral surface of the hole is provided. The hydraulic actuator provided is also known.
[0005]
In the hydraulic actuator described in the publication, when the movable processing tool moves to the fixed processing tool side, the oil replenishing piston slides on the inner peripheral surface of the hole, so that the oil in the hole passes into the cylinder chamber via the hydraulic pump. The movable processing tool is moved while preventing the generation of negative pressure in the hydraulic circuit.
[0006]
[Problems to be solved by the invention]
However, in a hydraulic actuator equipped with the above air bag, when filling and exchanging oil by filling the hydraulic circuit with oil, a fixed amount of oil is first injected and then the movable processing tool is fixed. It was necessary to move to the processing tool side, and then to inject oil again in this state, which was complicated.
In other words, the hydraulic actuator requires that the air bag is contracted in a state where the hydraulic pump is not driven, that is, in a state where the movable processing tool is separated from the fixed processing tool. Simply injecting oil in a state of being separated from the fixed processing tool does not sufficiently shrink the air bag. Therefore, it is necessary to inject oil again after moving the movable processing tool to the fixed processing tool side.
Moreover, in a hydraulic actuator having a hydraulic circuit provided with a return valve or the like that returns oil in the cylinder chamber when the movable processing tool moves beyond a certain level, the workpiece such as a reinforcing bar is moved to the movable processing tool and the fixed processing tool. It is necessary to perform the above oil injection operation in a state of being sandwiched between the two, and this operation is particularly troublesome.
[0007]
In the hydraulic actuator, the air bag is always in a contracted state because the movable processing tool is always separated from the fixed processing tool, and there is a possibility that the inner surfaces of the air bag are in close contact with each other. There was also a problem that the air bag deteriorated quickly.
[0008]
On the other hand, in the hydraulic operating machine having the oil replenishing piston, it is necessary to communicate the hole with the atmosphere via a communication hole or the like in order to slide the oil replenishing piston when the movable processing tool moves. As a result, foreign dust or the like enters the hole from the communication hole, which causes a problem that the oil replenishing piston cannot slide accurately.
Further, the hydraulic actuator has a problem that the hole of the head frame needs to be formed on a smooth surface so that the oil replenishing piston can slide, and the manufacturing cost increases.
[0009]
In the hydraulic actuator having an air bag as described above, a stopper provided at the opening edge of the air bag is screwed to the hole of the head frame as described in, for example, Japanese Utility Model Laid-Open No. 4-122494. Since the opening edge of the air bag is attached in close contact with the inner surface of the hole, there is a problem that the opening edge of the air bag is easily damaged by the rotation of the stopper during the screwing.
Moreover, the opening edge of the air bag of the hydraulic actuator described in Japanese Utility Model Laid-Open No. 3-19621 and Japanese Utility Model Publication No. 5-36568 is not in close contact with the inner surface of the hole, but the air bag also has a bolt on the nut inside the bag. Since it is pressed against the mounting member by being screwed, a force in the opposite direction acts on the outer surface and the inner surface of the opening edge of the air bag by screwing in the bolt, thereby damaging the opening edge of the air bag. It had the problem of being easy. In addition, the hydraulic actuator of the publication has a problem in that it has a large number of parts for attaching an air bag, and cannot reduce the manufacturing cost, and the work of attaching and detaching the air bag is complicated. Was.
[0010]
In order to solve the above-mentioned problems, the applicant of the present application previously applied for a hydraulic actuator according to Japanese Patent Application No. 8-123666.
In such a hydraulic actuator, a bag body for supplying oil into the cylinder chamber when the movable processing tool is moved is inserted into the housing hole formed in the head frame, and the opening of the bag body is communicated with the cylinder chamber. The structure which comprises is comprised.
[0011]
The hydraulic actuator having such a configuration is generated in the hydraulic circuit because the bag body contracts when the movable processing tool moves to the fixed processing tool side, and the oil in the bag is sent into the cylinder chamber from the opening. It operates while preventing the generation of negative pressure.
Therefore, since the bag body expands when the movable processing tool and the fixed processing tool are separated from each other, the oil can be replenished / replaced by injecting oil into the hydraulic circuit in this state. Is.
[0012]
However, in the hydraulic actuator disclosed in the above application, the bag body is attached by inserting the bag body from the front surface of the head frame and fixing the vicinity of the opening of the inserted bag body. For this reason, the operation of attaching the bag body is complicated, and it has been difficult to mass-produce this type of actuator.
[0013]
Therefore, the present invention has been made to solve the above-described problems, and the problem of the present invention is that the oil replenishment / replacement operation is easy and the attachment operation of the bag body during manufacture is simple. An object of the present invention is to provide a hydraulic actuator that can be easily manufactured.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problems, a hydraulic actuator according to the present invention includes an actuator main body A having a head chamber 5 to which a fixing processing tool 35 is attached and a housing main body 1 fixed to each other and having a cylinder chamber 13 therein, and The piston B is provided in the cylinder chamber 13 of the actuator main body A so as to be slidable and to which the movable processing tool 33 is attached.,Moreover, the head frame 5 is opened at least on the housing body 1 side.Opened accommodation hole 45 And the accommodation hole 45 In the bag 47 Inserted into the bag 47 Opening 47a Is the buttocks projecting outward 65 Having said cylinder chamber 13 While the bag is communicated inside 47 The opening of 47a Perforated on the opposite side 73 Formed and the perforated 73 Can be press-fitted 77 And is configured to be closed by the opening 47a ofThe flange 65 is crimped to the head frame 5 and the housing body 1.Said byThe bag body 47 is fixed.
[0015]
In the hydraulic actuator according to the present invention having such a configuration, after assembling, the bag body 47 is accommodated in the accommodation hole 45 of the head frame 5, and then the head frame 5 and the housing body 1 are connected by bolts or the like. By fixing, the collar part 65 of the bag body 47 is pressure-bonded and attached.
[0016]
In the hydraulic actuator according to the present invention assembled in this way, the bag body 47 contracts when the movable processing tool 33 is moved to the fixed processing tool 35 side in order to perform a processing operation such as cutting. The oil in 47 is sent into the cylinder chamber 13 and can be operated while preventing the generation of negative pressure generated in the hydraulic circuit.
In addition, when oil is injected into the hydraulic circuit when oil is replenished or exchanged, the bag body 47 expands in a state where the movable processing tool 33 and the fixed processing tool 35 are separated from each other. 47 can accommodate oil required when the movable processing tool 33 is moved.
[0017]
Furthermore, in the hydraulic actuator according to the present invention, it is possible to form the housing step portion 46 for housing the flange portion 65 of the bag body 47 in the housing body 1. When the bag body 47 is stored in the storage hole 45 in advance during the fixing operation, the flange portion 65 of the bag body 47 protrudes from the end surface of the head frame 5 and is inadvertently brought into contact with the bag body 47 during the operation. May be damaged.
Therefore, in the hydraulic actuator according to the present invention, as described in claim 2, it is preferable to form the accommodating step portion 46 in the head frame 5, so that the collar portion 65 is accommodated in the accommodating step portion 46 in advance during the fixing operation. In this state, the bag body 47 can be stored in the storage hole 45, and in this state, since the width of the protruding portion 65 of the bag body 47 is small, the adhering operation can be performed easily and reliably. Have
[0018]
Further, in the hydraulic actuator according to the present invention, as described in claim 3, the housing body 1 includesThe cylinder chamber 13 And bag 47 Communication path communicating with 69 And the communication path 69 The bag body 47 The opening facing the buttock 65 The housing body abutting against 1 Contact surface 67 Formed in the inner part of the bag and the bag body 47 ofThe buttocks 65 are at leastAboveContact surface of housing body 167It is preferable that the portion that comes into contact with is configured to have packing properties.
In the hydraulic actuator according to claim 3, having such a configuration, the abutting surface of the housing body 1 is secured by fixing the head frame 5 and the housing body 1 and crimping the flange portion 65 during assembly.67Therefore, there is an advantage that leakage of oil that is supplied / discharged from the bag body 47 and passes through the communication passage 69 can be prevented.
[0019]
In addition, in the hydraulic actuator according to claim 3, in order to provide a packing property to the portion that contacts the contact surface 67 of the flange portion 65, a packing member such as an O-ring can be additionally provided on the flange portion 65. However, it is preferable to form the flange portion 65 itself from a rubber member or the like that has restoration and high adhesion.
[0020]
Furthermore, in the hydraulic actuator according to the present invention, the bag body 47 is fitted into the shrinkable bag member 61 having the flange portion 65 and the opening edge of the bag member 61, as in claim 4. It is also possible to configure it with a regulating member 51 that regulates the contraction of the opening edge 61. 5. The hydraulic actuator according to claim 4, wherein the contraction of the opening edge of the bag member 61 is restricted by the restriction member 51, so that the opening edge of the bag member 61 is bent during assembly. Can be prevented, and the bag body 47 can be securely attached.
Further, at the time of the processing operation, the movable processing tool 33 is moved to the fixed processing tool 35 side and the bag body 47 contracts. However, since the opening edge of the bag member 61 is regulated by the regulating member 51, it is repeatedly performed. It is possible to prevent breakage of the parts accompanying the processing work.
[0021]
Further, in the hydraulic actuator according to claim 4, as defined in claim 5, the restricting member 51 is formed of a cylindrical member formed by protruding an engaging portion 55 toward the outside, and the bag When the member 61 is provided with a locked portion 63 projecting inward at a position spaced apart from the opening edge 61a by a certain distance L, and when the regulating member 51 is fitted into the opening edge 61b of the bag member 61, It is preferable that the stop portion 55 is locked to the locked portion 63 and the restriction member 51 is accommodated in the bag member 61.
The hydraulic actuator according to claim 4, which has such a configuration, inserts the regulating member 51 from the opening edge 61 a side of the bag member 61, so that the regulating member 51 is fitted inside the bag member 61 and the bag body 47. Since the locking portion 55 of the regulating member 51 is locked to the locked portion 63 of the bag member 61 in this internally fitted state, the regulating member 51 is inadvertently placed inside the bag member 61. It can be prevented from entering.
In this case, the fixed distance L means a distance between the opening edge 61a in which the regulating member 51 is accommodated in the bag member 61 and the locked portion 63 in a state where the bag body 47 is crimped and fixed. To do.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
First, as one embodiment of the present invention, as shown in FIG. 1, an actuator main body A in which a head frame 5 is fixed to a housing main body 1 by a fixing bolt 6 at a front portion and a cylinder chamber 13 is formed inside. And a piston B that is slidably interposed in the cylinder chamber 13 of the actuator main body A. A movable cutter 33 is attached to the piston B, and a fixed blade 35 is opposed to the movable cutter 33 in a head frame. The hydraulic actuator attached to 5 will be described below.
Note that a plurality of the fixing bolts 6 are arranged so that the head frame 5 and the housing body 1 are evenly tightened at the respective peripheral portions.
[0023]
In this embodiment, the housing body 1 of the actuator main body A includes a first housing 1A in which an electric motor is mounted, and a first chamber 1A fixed to the front portion of the first housing 1A and having a cylinder chamber 13 therein. The two housings 1B, and the upper and lower portions of the first and second housings 1A and 1B are fixed to the grip portion 3. Note that a switch 7 for operating and stopping the electric motor is provided below the grip portion 3.
The head frame 5 is fixed to the front portion of the second housing 1B of the housing body 1.
[0024]
A space is provided between the first housing 1A and the second housing 1B, and a first oil chamber 9a for storing oil to be supplied to the cylinder chamber 13 is formed.
[0025]
The second housing 1B is formed with a plurality of feed passages 11 at the periphery thereof, and the feed passage 11 is moved from the first oil chamber 9a to the cylinder chamber 13 by sliding of the ram 25. It has the following structure to cause the oil flow.
[0026]
A drive shaft 19 of an electric motor (not shown) provided inside the first housing 1A is provided so as to protrude from the first housing 1A to the inside of the second housing 1B. The cam 21 is fixed.
A plurality of rams 25 are radially disposed inside the second housing 1 </ b> B so that one end thereof is in contact with the eccentric cam 21 and the other end is in contact with the valve body 15. It can be opened and closed freely. That is, the ram 25 that contacts the eccentric cam 21 slides due to the rotation of the drive shaft 19, and the valve body 15 opens and closes the feeding path 11 by sliding of the ram 25, and the sliding and valve of the ram 25 When the body 15 is opened and closed, the oil in the first oil chamber 9 a is supplied to the cylinder chamber 13 via the supply path 11. In the present embodiment, the hydraulic pump 17 is configured by the valve body 15, the eccentric cam 21, and the ram 25.
[0027]
Further, the second housing 1B is formed with a return path 41 that is opened and closed by the return valve 43 at the center thereof. When the return valve 43 is opened, the oil is transferred from the cylinder chamber 13 to the oil chamber 9a via the return path 41. Is configured to be returned.
[0028]
The return valve 43 is slidably attached to a cylindrical body 31 fixed to the rear side of the recessed portion 29 inside the piston B, and the cylindrical body 31 is connected to both ends of the return valve 43. Abutting flanges 43a and 43b are formed.
As a result, the piston B moves forward, the front surface of the cylindrical body 31 comes into contact with the flange 43a on the front side of the return valve 43 and moves forward, whereby the return path 41 is opened, while the piston B moves rearward and the cylinder The rear surface of the body 31 abuts on the flange 43b on the rear side of the return valve 43, the return valve 43 moves rearward, and abuts on the front surface of the second housing 1B, thereby closing the return path 41. .
[0029]
Further, the piston B includes a flange portion 37 slidable in the cylinder chamber 13 and a rod 39 protruding forward from the flange portion 37, and the front surface of the flange portion 37 and the inner surface of the head frame 5. A space is formed as a second oil chamber 9b.
[0030]
Further, the head frame 5 has a hole portion through which the rod 39 is slidable, and a tip end portion 39a of the rod 39 protrudes from the hole portion, and the movable cutter 33 is attached to the tip end portion 39a. Yes.
[0031]
Further, the head frame 5 is fixed so that the column portion 5a extending forward and below the movable cutter 33 and the fixed blade 35 rises upward from the column portion 5a so as to face the movable cutter 33. Are formed in a substantially U shape in side view.
[0032]
The column portion 5a of the head frame 5 is formed with a substantially cylindrical accommodation hole 45 penetrating from the front outer surface portion toward the rear, and the accommodation hole 45 has a front side and a rear side ( It opens at the housing body 1 side.
[0033]
In addition, the accommodation hole 45 is formed with an accommodation step 46 having a larger diameter than the other part at the rear portion thereof, and the accommodation step 46 is formed so as to accommodate a flange portion 65 of a bag body 47 to be described later. Being done.
[0034]
Furthermore, a female screw is formed on the inner peripheral surface of the opening surface on the front side of the accommodation hole 45, and a lid body 49 having a hole at the center is attached to the female screw, and the accommodation hole portion communicates with the atmosphere. 45 is closed.
[0035]
Also, a bag body 47 capable of storing oil supplied to the cylinder chamber 13 and the first oil chamber 9a is mounted in the accommodation hole 45, and the bag body 47 has a communication passage 69 whose opening 47a is described later. The first oil chamber 9a and the hydraulic pump 17 communicate with the cylinder chamber 13.
[0036]
As shown in FIG. 2, the bag body 47 is internally fitted into a shrinkable bag member 61 that is molded from elastic rubber into a bag shape and an opening edge portion 61b of the bag member 61 (a portion near the opening edge 61a). It is comprised from the metal cylindrical member 51 which controls the shrinkage | contraction to the inner side of the opening edge part 61b of the bag member 61. As shown in FIG.
Here, the tubular member 51 includes a tubular body 53 having a hollow portion serving as a communication hole 52 therein, and a bag member 61 that protrudes outward from a peripheral edge on one end side (rear side) of the tubular body 53. It is comprised by the latching | locking part 55 which has an outer diameter substantially the same as this inner diameter.
In addition, a tapered surface 53a having an outer diameter that decreases toward the front is formed on the outer peripheral surface on the front side of the cylindrical main body 53. In the drawing, the tapered surface 53a is an inclined surface with a corner portion cut away, but the tapered surface 53a can also be formed from a curved surface inclined inward toward the front side.
[0037]
Further, in the present embodiment, oil is flown into and out of the communication passage 69 described later from the hollow portion at the center of the cylinder main body 53, and the hollow portion corresponds to the opening 47 a of the bag body 47.
[0038]
The bag member 61 is provided with a locked portion 63 projecting inward from the inner peripheral surface at a position spaced apart from the opening edge 61a by a certain distance L.
Here, the inner diameter of the locked portion 63 is set to be substantially the same as the outer diameter of the cylindrical main body 53 of the cylindrical member 51, and the cylindrical member 51 is fitted into the opening edge 61 b of the bag member 61. At this time, the locking portion 55 is locked to the locked portion 63, and the outer surface of the cylinder main body 53 of the cylindrical member 51 and the inner surface of the locked portion 63 are substantially in contact with each other. Note that the fact that the inner diameter of the locked portion 63 and the outer diameter of the cylinder main body 53 are substantially the same includes the case where the locked portion 63 and the cylindrical member 51 have a slight gap when fitted inside.
[0039]
Further, the bag member 61 has a flange 65 projecting outward from the opening edge 61a.
[0040]
Here, the outer diameter of the flange portion 65 is larger than the inner diameter of the accommodation hole portion 45 and smaller than the inner diameter of the accommodation step portion 46, and the front-rear width (thickness) of the flange portion 65 is not In the compressed state, it is larger than the front-rear width (height of the step) of the accommodation step part 46 and is provided to be the same as the front-rear width of the accommodation step part 46 by being compressed and deformed.
Therefore, when the bag member 61 is accommodated in the accommodation hole 45 of the head frame 5, the collar portion 65 of the bag member 61 is provided so as to be exposed from the opening surface on the rear side of the accommodation hole 45. Then, after the head frame 5 and the housing body 1 are secured after being accommodated in the accommodation hole 45, the flange portion 65 is compressed in the front-rear direction by the accommodation step portion 46 and the flat contact surface 67 of the housing body 1. The housing step portion 46 is configured to be deformed to have the same width as the front and rear width.
[0041]
Further, the interval (the fixed distance L) between the locked portion 63 and the opening edge 61a in the compression deformed state of the flange portion 65 is smaller than the front-rear width (the depth of the step) of the accommodation step portion 46, and the tube The front-rear width of the locking portion 55 of the shaped member 51 is set to be substantially the same.
Therefore, when the locking portion 55 is locked to the locked portion 63, the cylindrical member 51 is configured to be accommodated in the bag member 61 without being exposed from the opening edge 61a.
[0042]
On the other hand, the front-rear width of the locked portion 63 projecting inward is shorter than the length of the cylinder main body 53 on the front side of the locking portion 55, so that the locking portion 55 is covered. When the cylindrical member 51 is attached to the bag member 61 in a state of being locked to the locking portion 63, the tip end portion 53a of the cylindrical main body 53 protrudes forward (inside the bag) from the locked portion 63. The distal end portion 53a is configured not to contact the bag member 61.
[0043]
Furthermore, in the second housing 1BIs a passage 69 Is formed, the communication path 69 Bag body 47 The opening facing the buttocks 65 Housing body that contacts 1 Contact surface 67 Than the inner part,The communication passage 69 is branched into a first series passage 69a that communicates with the first oil chamber 9a and a second communication passage 69b that communicates with the second oil chamber 9b. Thus, the bag member 61 is communicated with the first and second oil chambers 9a and 9b. The second communication passage 69b is inclined to the rear side (housing main body 1 side) from the second oil chamber 9b to the outside.
[0044]
Further, the bag member 61 has a perforation 73 formed forward, that is, on the side facing the opening 47a, and a closing member 77 is press-fitted into the perforation 73 to be closed.
In the figure, reference numeral 79 denotes a spring that always elastically presses the piston B backward.
[0045]
Since the hydraulic actuator according to the present embodiment has the above-described configuration, a workpiece such as a reinforcing bar is cut by the following process.
[0046]
First, when the electric motor is driven, the oil in the first oil chamber 9 a is sent to the cylinder chamber 13 by the hydraulic pump 17, the cylinder chamber 13 becomes high pressure, and the piston B moves forward against the pressing force of the spring 79. To do. By the movement of the piston B, the oil in the second oil chamber 9b is sent to the first oil chamber 9a via the second communication passage 69b and the first series passage 69a.
At this time, the volume increase in the cylinder chamber 13 due to the forward movement of the piston B is larger than the volume decrease in the second oil chamber 9b due to the presence of the rod 39 of the piston B. Accordingly, the bag member 61 contracts with the negative pressure, and the oil inside the bag member 61 is supplied to the first oil chamber 9a through the communication passage 69.
In this embodiment, the shrinkage of the bag member 61 is performed in front of the opening edge 61b, and the shrinkage is restricted by the cylindrical member 51 at the opening edge 61b. It has the advantage that damage can be prevented.
Further, the distal end portion 53a of the cylinder main body 53 protrudes forward (inside the bag) from the locked portion 63 so that the distal end portion 53a does not contact the bag member 61. The bag member 61 can be prevented from being damaged due to contact with the portion 53a.
[0047]
Then, the piston B moves forward, the front surface of the cylindrical body 31 comes into contact with the flange 43a on the front side of the return valve 43 and moves forward, so that the return passage 41 is opened, and the oil is supplied from the cylinder chamber 13 to the first oil chamber. It flows into 9 a and the piston B moves backward by the pressing force of the spring 79.
[0048]
Thereafter, the piston B moves backward, the flange 43b behind the return valve 43 comes into contact with the rear surface of the cylinder 31, the return valve 43 moves backward, and the flange 43b behind the return valve 43 comes into contact with the second housing 1B. Then, the return path 41 is closed, and the backward movement of the piston B is prevented and stopped.
The movement of the piston B toward the rear side causes oil to flow into the bag member 61 and the bag member 61 expands.
[0049]
Further, when oil is filled in the hydraulic circuit when replenishing or exchanging oil, the oil is supplied from an oil filler (not shown) with the movable processing tool 33 and the fixed processing tool 35 being separated from each other. By injecting oil, it is possible to accommodate the oil required when moving the movable processing tool 33 in the bag body 47, and this has the advantage that the oil injection operation can be performed very easily.
[0050]
The hydraulic actuator according to this embodiment operates as described above. Next, a method for assembling the hydraulic actuator will be described.
[0051]
First, the housing body 1 and the head frame 5 having the above-described structure are produced.
[0052]
Then, the bag body 47 is inserted into the accommodation hole 45 of the head frame 5. At the time of this insertion, after the tubular member 51 is fitted inside the bag member 61, the bag member 61 is inserted into the receiving hole 45, or after the bag member 61 is inserted into the receiving hole 45. Any method of internally fitting the tubular member 51 to the bag member 61 may be employed.
[0053]
The head frame 5 in which the bag body 47 is accommodated and the housing body 1 are fixed by fixing bolts 6.
As a result, the flange portion 65 of the bag body 47 protruding from the rear end surface of the head frame 5 is compressed and deformed by contact with the contact surface 67 of the housing body 1, and the bag body 47 is fixed. It will be.
When the flange portion 65 is compressed and deformed, the restricting member 51 restricts the shrinkage of the opening edge portion 61b of the bag member 61, thereby preventing the opening edge of the bag member 61 from being attached in a bent state or the like. This has the advantage that the bag body 47 can be securely attached.
[0054]
Since the hydraulic actuator of this embodiment can be assembled by the above-mentioned method, it has the advantage that the bag body 47 can be fixed very easily.
[0055]
Further, since the flange portion 65 is pressed against the contact surface in accordance with the fixing operation, leakage of oil supplied and discharged from the bag body 47 can be prevented, and a separate packing or the like is attached to the bag body 47. Has the advantage of not requiring
[0056]
Further, since the tapered surface 53a is formed on the front outer periphery of the cylinder body 53 toward the front, there is an advantage that the insertion into the bag member 61 can be easily performed.
[0057]
Furthermore, the hydraulic actuator according to the present embodiment has the advantage that since the housing hole 45 is formed in the head frame 5, the entire apparatus can be reduced in size and weight can be reduced.
Further, as described above, the bag member 61 is made of a rubber molded product, and the perforations 73 are formed on the surface facing the opening 47a. Therefore, the mold can be easily removed during molding, and the molding work can be performed. It also has the advantage of being easy.
[0058]
Although the present embodiment has the above-described advantages since it is configured as described above, the present invention is not limited to this, and the design can be changed as appropriate within the intended scope of the present invention.
That is, in the present invention, the movable processing tool 33 and the fixed processing tool 35 are not limited to the movable cutter 33 and the fixed blade 35, and other movable punches, fixed dies and the like can be appropriately changed in design.
[0059]
Further, the specific configuration of the hydraulic pump 17 is not limited to that of the above embodiment, and the design can be changed as appropriate. In the above embodiment, the oil chambers 9a and 9b are provided. However, the present invention is not limited to this.
However, if the front of the piston B is also formed as the oil chamber 9 as in the above embodiment, there is an advantage that only a small amount of oil is stored in the bag body 47.
[0060]
Further, when two oil chambers 9a and 9b are provided as in the above-described embodiment, the oil chamber 9b to the oil chamber 9a are similar to the return valve 43 that returns oil from the valve cylinder chamber 13 to the oil chamber 9a. It is also possible to provide a return valve through which oil is returned.
[0061]
In addition, the shape of the actuator main body A, piston B, etc. can be appropriately changed within the range intended by the present invention, and the cylinder chamber 13 is not limited to the one formed in the second housing 1B. It is also possible to form.
[0062]
Further, the specific structure of the bag body 47 is not limited to that of the above embodiment, and has a flange portion 65 protruding outward, and the flange portion 65 is crimped to the head frame 5 and the housing body 1. If it is fixed by being done, it is the range which this invention intends.
[0063]
Moreover, in this invention, the cylindrical member 51 is not an essential requirement, and even if it does not have a cylindrical member as shown in FIG. 4, it is the range which this invention intends.
Moreover, in the invention according to claim 4, the tubular member of the above embodiment is used as the regulating member 51 that is fitted into the opening edge portion 61 b of the bag member 61 and restricts the shrinkage of the opening edge portion 61 b of the bag member 61. The restricting member 51 is not limited to 51, and various forms of the restricting member 51 can be employed. For example, even a ring-shaped member in which the locking portion 55 is not provided can be employed.
[0064]
【The invention's effect】
As described above, the hydraulic operating machine according to the present invention includes a bag body that is inserted into the housing hole of the head frame and whose opening communicates with the cylinder chamber. The oil can be replenished and replaced by injecting oil in a state where the two are spaced apart from each other, and the operation is extremely easy. After assembly, the bag body is accommodated in the accommodation hole. By fixing the head frame and the housing main body with bolts or the like, the flange portion of the bag body is pressure-bonded and attached, so that it is possible to easily manufacture the bag body.
[Brief description of the drawings]
FIG. 1 is a side view including a partial cross section of a hydraulic actuator according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional side view of a main part of the hydraulic actuator according to the embodiment.
FIG. 3 is an enlarged cross-sectional side view of a main part before assembly of the hydraulic actuator according to the embodiment.
FIG. 4 is an enlarged cross-sectional side view of a main part of a hydraulic actuator according to another embodiment.
[Explanation of symbols]
A ... Actuator body, B ... Piston, 1 ... Housing body, 1A ... First housing, 1B ... Second housing, 3 ... Grip part, 5 ... Head frame, 5a ... Column part, 5b ... Bending part, 6 ... Adhering Bolt, 7 ... switch, 9a, 9b ... oil chamber, 11 ... feed passage, 13 ... cylinder chamber, 15 ... valve body, 17 ... hydraulic pump, 19 ... drive shaft, 21 ... eccentric cam, 25 ... ram, 29 ... Recessed portion, 31 ... cylindrical body, 33 ... movable processing tool (movable cutter), 35 ... fixed processing tool (fixed blade), 41 ... returning path, 43 ... return valve, 43a, 43b ... flange, 45 ... accommodating hole, 46 ... Accommodating step, 47 ... bag, 47a ... opening, 51 ... cylindrical member (regulating member), 52 ... communication hole, 53 ... cylinder main body, 55 ... locking portion, 61 ... bag member, 61a ... opening Edge 61b ... Opening edge 63 ... Locked part 65 ... buttocks, 67 ... abutment surface, 69 ... communication path, 73 ... perforation, 77 ... blocking member

Claims (5)

An actuator body (A) having a cylinder chamber (13) in which a head frame (5) to which a fixing tool (35) is attached and a housing body (1) are fixed, and the actuator body (A) The piston chamber (13) is slidably provided in the cylinder chamber (13) and has a movable processing tool (33) attached thereto , and the head frame (5) is opened at least on the housing body (1) side. formed mouth was receiving bore (45), said accommodation hole portion (45) is inserted is bag (47), the opening of the bag body (47) (47a) is projected to the outside While having a flange portion (65) and communicating with the cylinder chamber (13) , a hole (73) is formed on the side of the bag body (47) facing the opening portion (47a) , The perforation (73) is configured to be closed by a press-fit closing member (77) , and the flange (65) of the opening (47a) is crimped to the head frame (5) and the housing body (1). by the bag (47) is solid with Rukoto A hydraulic actuator characterized by being defined. The hydraulic actuator according to claim 1, wherein the head frame (5) is formed with an accommodating step (46) for accommodating the flange (65) of the bag (47). . Wherein the housing body (1), the cylinder chamber (13) and the communication passage (69) is provided with a second communicating the bag (47), an opening facing the bag body communication passage (69) (47) but the formed inner portion than the abutment surface (67) of the housing body (1), and the flange portion of the bag (47) (65), at least the housing, wherein the flange portion (65) abuts The hydraulic actuator according to claim 1 or 2, wherein a portion of the main body (1) that contacts the contact surface (67) has a packing property. The bag body (47) includes a shrinkable bag member (61) having a collar portion (65) and an opening edge portion (61b) of the bag member (61). The hydraulic actuator according to any one of claims 1 to 3, comprising a regulating member (51) for regulating the contraction of the edge portion (61b). The restricting member (51) is formed of a cylindrical member with a locking portion (55) protruding outward, and the bag member (61) has a constant distance (L) from the opening edge (61a). The locked portion (63) protrudes inward at a spaced position, and when the restricting member (51) is fitted inside the opening edge (61b) of the bag member (61), The hydraulic actuator according to claim 4, wherein the stop portion (55) is locked to the locked portion (63) and the restricting member (51) is accommodated in the bag member (61).

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