JPH1037912A - Fluid pressure actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide reduction in a width dimension and thickness in an actuator whose members are reciprocated in a linear direction by means of the fluid pressure of compressed air or the like. SOLUTION: A pressure chamber 13 is partitioned by a rod cover 14 fitted in a cylinder body 11 and a head cover 16, a piston rod 20 which penetrates the rod cover 14 is fixed on a piston 21 formed in the pressure chamber 13 so as to slide freely in the axial direction, and a linear guide 30 is embedded in the front end part of the cylinder body 11, positioned on the more forward side than the rod cover 14. A guide rail 35 formed along the linear guide 30 so as to slide freely is fitted onto a table 32 joined to the piston rod 20, and the guide rail 35 is guided together with the table 32 by the linear guide 30 when the table 32 is reciprocated in a linear direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure actuator which reciprocates a member in a linear direction by fluid pressure such as compressed air.

[0002]

2. Description of the Related Art In order to move a workpiece, that is, a work in a vertical direction or a horizontal direction, and to move a jig or a tool for holding or processing the work in a vertical or horizontal direction, a member is pneumatically moved. A hydraulic actuator for reciprocating in a linear direction is used.

An example of this type of fluid pressure actuator is shown in FIG. 11, in which a piston 3 is provided slidably in the axial direction in a cylinder chamber or pressure chamber 2 formed in a cylinder body 1. The table 5 is connected to a piston rod 4 attached to the piston 3. In order to guide the table 5 in a linear direction, a guide rail 6 having a quadrangular cross section is attached to the cylinder body 1, and a linear guide 7 having a U-shaped cross section slidable along the guide groove of the guide rail 6. It is fixed to the table 5. When reducing the frictional resistance of the linear guide 7 reciprocating along the guide rail 6 together with the table 5, the linear guide 7
A plurality of balls are housed in the guide rail 6
Contact.

As described above, the guide rail 6 having a quadrangular cross section is used.
As a fluid pressure actuator of a type having a linear guide 7 having a U-shaped cross section, there is a type in which a guide rail is formed integrally with a cylinder body (for example, see Japanese Utility Model Application Laid-Open No. 6-43302). . Further, there is one in which a guide rail is formed integrally with a cylinder body and the table itself has a function of a linear guide (see, for example, Japanese Utility Model Laid-Open No. 6-69404).

[0005]

Regardless of the type of the hydraulic actuator that has been developed so far, as shown in FIG. 11, the guide rail 6 extends over the entire length of the cylinder body 1 as shown in FIG. So that
The table 5 is guided along this. Since the guide rail 6 is provided on the cylinder body 1 by the screw member 8, a thickness for fixing the screw member 8 is required. Similarly, with regard to the niria guide 7, the table 5 is
, A thickness for fixing the screw member 9 is required.

Therefore, as shown in FIG. 11, when the table 5 is reciprocated in the horizontal direction, the cylinder body 1
The vertical dimension A from the lower surface of the table to the upper surface of the table 5 increases, and depending on the installation location where the fluid pressure actuator is used, other members and the fluid pressure actuator may interfere with each other, and the fluid pressure actuator May not be available. In addition, when the conveyed member such as a workpiece is moved in the up-down direction by mounting the fluid pressure actuator in the up-down direction, the dimension in the horizontal direction becomes large, and similarly, interference with other members may occur. .

Further, in the fluid pressure actuator shown in FIG. 11, when the piston rod 4 is moved backward and the table 5 is returned to the retreat limit position, the table 5 overlaps substantially the entire length of the cylinder body 1. Therefore, it is necessary to provide many types of tables having different lengths from each other in correspondence with the stroke of the piston rod 4 to be used, that is, the reciprocating stroke of the table 5. There is a problem that parts management at the time is difficult.

Further, since the table is adapted to the reciprocating stroke, the weight increases as the stroke becomes longer. In addition, while the table is generally made of aluminum alloy or the like to reduce its weight using a material, the table becomes longer corresponding to the stroke, so the table rigidity must be secured and the wall thickness must be increased. There is a problem that the weight increases by minutes.

An object of the present invention is to provide a fluid pressure actuator which can be reduced in width and thickness.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0011]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, a fluid pressure actuator according to the present invention comprises a cylinder body in which a rod cover and a head cover are attached and a pressure chamber is defined by these covers, and a piston provided in the pressure chamber so as to be slidable in the axial direction. A piston rod that is fixed to the rod cover and penetrates the rod cover, a linear guide that is embedded at the distal end of the cylinder body at a position closer to the distal end than the rod cover, and connected to the distal end of the piston rod and along the linear guide And a reciprocating member attached to a guide rail slidable in a direction parallel to the piston rod. When the reciprocating member reciprocates in a linear direction, the guide rail is guided by the linear guide together with the reciprocating member. It is characterized by having made it. The linear guide and the rod cover overlap in a direction perpendicular to the central axis of the piston rod. The linear guide has a guide groove that opens outward, and a relief groove through which a guide rail that slides along the guide groove passes is formed in the cylinder body.

In the present invention, the linear guide is attached so as to be embedded in the tip of the cylinder body.
Since the linear guide is of an embedded type, the width of the fluid pressure actuator in a direction perpendicular to the linear guide surface can be reduced. The amount of embedding can be such that the rod cover and the linear guide overlap each other, and the width of the fluid pressure actuator can be reduced while securing the required thickness of the cylinder body. Further, by forming a relief groove for the guide rail in the cylinder body, the width of the fluid pressure actuator can be reduced. When changing the reciprocating stroke of the reciprocating member, it is only necessary to change the length of the guide rail that slides along the linear guide in accordance with the reciprocating stroke. No changes are required. With this, it is possible to manufacture many types of hydraulic actuators by using one type of reciprocating member having the same size. Therefore, it is possible to manufacture various types of hydraulic actuators having different moving strokes with a small number of parts. It can be manufactured.

[0014] In addition, with one type of reciprocating member having the same size, the table length does not need to be increased corresponding to the reciprocating stroke, so that the weight can be reduced. Further, the table is generally made of an aluminum alloy or the like, and a method of increasing the wall thickness in order to cope with a long stroke is used. In the present application, a hardened steel material is generally used. Since the guide rails can be used directly on the table side, the thickness of the table can be reduced and the weight can be reduced.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 5 show a fluid pressure actuator according to an embodiment of the present invention. As shown in FIG. 1, the fluid pressure actuator has a substantially rectangular parallelepiped block shape as a whole. Of the cylinder body 11. As shown in FIG. 2, the cylinder body 11 has four side surfaces 11a to 11d and front and rear end surfaces 11e and 11f.
One side surface 1 of two long side surfaces 11a and 11b
1a is a mounting surface, and two narrow side surfaces 11c and 11
d is a mounting surface, and a total of three side surfaces are mounting surfaces. Using at least one of these three side surfaces, the cylinder body 11 can be mounted on a mounting member (not shown).

As shown in FIG. 3, the cylinder body 11 has a mounting hole 12 formed at the front end thereof, and a cylinder chamber or pressure chamber 13 having an inner diameter smaller than that of the mounting hole 12 formed at the rear end thereof. ing. A rod cover 14 is mounted on the rear end of the mounting hole 12, and a head cover 16 is mounted on a mounting hole 15 formed on the rear end of the cylinder body 11, and a pressure chamber 13 is provided between the covers 14 and 16.
Are formed. As shown in FIG. 4, the rod cover 14 is fixed by two pins 17 fitted in fitting holes formed in the cylinder body 11, and the head cover 16 is a C-shaped snap as shown in FIG. It is fixed by a ring 18. The rod cover 14 may be fixed by a snap ring.
6 may be fixed by pins.
Each of the covers 14 and 16 may be fixed to the cylinder body 11 by caulking.

A piston rod 20 is mounted so as to be slidable in the axial direction through the rod cover 14. A piston 21 is fixed to the rear end of the piston rod 20, and a seal member 22 and a magnet 23 are fixed to the piston 21. And the front and rear shock absorbing members 24 and 25 are assembled.

In order to reciprocate the piston 21 in the pressure chamber 13 in the axial direction, as shown in FIGS. 1 and 2, the cylinder body 11 has a supply / discharge port 26 communicating with the rod cover side of the pressure chamber 13. A supply / discharge port 27 communicating with the head cover side of the pressure chamber is formed. When compressed air is supplied from one supply / discharge port 26, the piston rod 20 moves backward, and compressed air is supplied from the other supply / discharge port 27. When supplied, the piston rod 20 moves forward. Although these supply / discharge ports 26 and 27 are formed on the side surface 11c, they may be formed on another side surface 11d, and furthermore, one by one on each of the two side surfaces 11c and 11d. Is also good.

A linear guide 30 is embedded in a notch formed at the front end of the cylinder body 11 as shown in FIGS. 2 and 5, and is fixed to the cylinder body 11 by two screw members 31. . This linear guide 30
Has a U-shaped cross section as shown in the drawing, and as shown in FIG.
Is embedded in the cylinder body 11, so that the rod cover 14 is
The portion of the dimension L overlaps in the vertical direction. In this way, by embedding the linear guide 30 in the cylinder body 11 and overlapping the linear guide 30 with the rod cover 14, it is possible to reduce the width and obtain a thin fluid pressure actuator.
This fluid pressure actuator can be installed even in a narrow place.

As shown in FIG. 3, the piston rod 2
A table 32 as a reciprocating member is fixed to the leading end of the bracket 0 by a fastening nut 33. The table 32 is composed of a table body 32a extending parallel to the piston rod 20 and a connecting part extending perpendicular to the table body 32a. 32b. A guide rail 35 slidably mounted in a guide groove 34 formed in the linear guide 30 is attached to the table 32 by a screw member 36.
The guide rail 35 includes the linear guide 30 and the cylinder body 1.
1, the guide rail 35 slides while its inner surface is located inside the side surface 11 b of the cylinder body 11. Are formed, and the table 32
During the reciprocating movement of the guide rail 35, the guide rail 35 moves along the relief groove 37, and the width of the fluid pressure actuator can be reduced.

FIG. 1 shows a side surface 11b of the cylinder body 11.
As shown in FIG. 3, two sensor mounting grooves 3 extending in the longitudinal direction are provided.
8 are formed, and the respective sensor mounting grooves 38 are formed on both sides of the relief groove 37, and have a predetermined distance from the pressure chamber 13 as shown in FIG. A sensor (not shown) is mounted in each sensor mounting groove 38, and whether or not the piston 21 has reached the forward end position or the backward end position in response to the magnetic field of the magnet provided in the piston 21 is determined. Are detected by the respective sensors. As shown in FIG. 6, each sensor mounting groove 38 is formed in a U-shaped cross section, and a tapered surface 38a is formed at the upper end of each sensor mounting groove 38.

In the fluid pressure actuator shown in FIG. 11, the linear guide is attached to the table, whereas the linear guide 30 is fixed to the cylinder body 11 as shown in FIGS. As a result, the length of the guide rail 35 in the longitudinal direction of the cylinder body 11 is reduced,
The guide rail 35 can be attached to the front end of the. Therefore, the guide rail 35 is connected to the cylinder body 11
Need not be provided over the entire length of the cylinder body 11 and the linear guide 30 is embedded in the cylinder body 11, so that the width dimension A from the bottom surface of the cylinder body 11 to the top surface of the linear guide 30 in FIG. Becomes

Thus, the guide groove 3 of the linear guide 30
FIG. 3 of a hydraulic cylinder including a guide rail 35 sliding along 4 and a table 32 attached thereto.
, The width A in the vertical direction can be made shorter than before, and this fluid pressure actuator can be installed in a narrow place while avoiding interference with other members.

In order to mount the fluid pressure actuator to a member (not shown) on the side surface 11a of the cylinder body 11, as shown in FIG.
1 and 11b, a screw hole 41 is formed in the cylinder body 11, and an end of each screw hole 41 is large on the side surface 11b side as shown in FIG. A counterbore 42 having a diameter is formed. When attaching a screw member to each screw hole 41, a concave portion 43 is formed in the table 32 to guide the head of the screw member.

The fluid pressure actuator is connected to the side surface 11c.
Are formed in the side surface 11c, two screw holes 44 are formed. Similar screw hole 44
Is also formed on the opposite side surface 11d.
It is also possible to mount the cylinder body 11 at the portion 1d.

By reciprocating the table 32, it is possible to move the work horizontally or to move it up and down.
As shown in FIG. 1, a screw hole 45 for attaching to the table 2a is formed in the table body 32a, and a screw hole 46 is also formed in the connecting portion 32b of the table 32. Also,
As shown in FIG. 5, the linear guide 30 is connected to the cylinder body 1.
A screw member 47 is attached to press one side in the width direction.

The reciprocating stroke of the piston rod 20 can be set arbitrarily. To make this stroke longer than shown in FIG.
1 is used, and a longer guide rail 35 is used corresponding to the stroke. However, even if the stroke becomes longer, the linear guide 30 and the table 3
2 can be the same as that shown in the figure.

The cylinder body 11 is formed by extruding an aluminum alloy or the like into a rod-shaped member having a hole having an inner diameter of the pressure chamber 13, a relief groove 37, and a sensor mounting groove 38, and then molding the rod into a predetermined length. It is manufactured by cutting into pieces and machining screw holes and the like.

FIGS. 8 to 10 are views showing a hydraulic actuator according to another embodiment of the present invention. In these figures, members common to those of the hydraulic actuator of the above embodiment are shown in FIGS. The same reference numerals are given.

In this case, the reciprocating member 4 is formed by a portion corresponding to the connecting portion 32b of the table 32 described above.
8 and the reciprocating member 48 is a screw member 4
9 to the guide rail 35 and the fastening nut 33
Is connected to the piston rod 20. As described above, the main unit 32 of the table 32 in the above-described embodiment is used.
Since it does not have a, the width dimension A in the up-down direction in FIG. 9 can be made smaller than that in the embodiment. When using this type of fluid pressure actuator to drive the reciprocating member 48 in the horizontal direction,
For example, the work can be moved in the horizontal direction by the reciprocating member 48. When the reciprocating member 48 is driven in the vertical direction, for example, the work is
8 allows movement in the vertical direction.

As shown in FIG. 8, a sensor 50 is fixed to each of the sensor mounting grooves 38 by a screw member 51. When each screw member 51 is tightened, the sensor 5
0 is the sensor mounting groove 3 shown in FIG.
8 will be pressed against the tapered surface 38a. A similar sensor 50 is mounted in the sensor mounting groove 38 in the above embodiment.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the invention. Needless to say, there is.

For example, the rear end of the piston rod 20 may protrude from the head cover 16 to the rear of the cylinder body 11, and a nut for adjusting the stroke may be attached to the protruding end. Alternatively, a large number of balls contacting the guide rail 35 may be accommodated in the linear guide 30 and the balls may be circulated in the guide rail 35.

[0035]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) Since the linear guide is embedded in the cylinder body, the width or thickness of the fluid pressure actuator can be reduced, and the fluid pressure actuator can be made thinner.

(2) To make only the movement stroke of the reciprocating member different without changing the basic structure, it is only necessary to make the lengths of the cylinder body, the guide rail and the piston rod different. Since there is no need to make the difference, the number of parts can be reduced and the weight can be reduced.

(3) This makes it easy to manage parts when manufacturing the fluid pressure actuator, thereby reducing manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fluid pressure actuator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the fluid pressure actuator shown in FIG. 1 with a table removed.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a right side view in FIG.

FIG. 7 is a bottom view of FIG. 3;

FIG. 8 is a plan view showing a fluid pressure actuator according to another embodiment of the present invention.

FIG. 9 is a front view of FIG. 8;

FIG. 10 is a sectional view taken along line 10-10 in FIG. 8;

FIG. 11 is a sectional view showing a conventional fluid pressure actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Cylinder main body 12 Mounting hole 13 Pressure chamber 14 Rod cover 15 Mounting hole 16 Head cover 17 Pin 18 Snap ring 20 Piston rod 21 Piston 22 Sealing member 23 Magnet 24, 25 Shock absorbing member 26, 27 Supply / discharge port 30 Linear guide 31 Screw member 32 Table (reciprocating member) 33 Fastening nut 34 Guide groove 35 Guide rail 36 Screw member 37 Escape groove 38 Sensor mounting groove 38a Tapered surface 41 Screw hole 42 Counterbore hole 43 Recess 44-46 Screw hole 47 Screw member 48 Reciprocating member 49 Screw member 50 Sensor 51 Screw member

Claims (3)

[Claims] 1. A rod body and a head cover are attached to each other, and a cylinder body having a pressure chamber defined by these covers is fixed to a piston provided slidably in the axial direction in the pressure chamber, and the rod cover is fixed to the cylinder body. A piston rod that penetrates the rod body, a linear guide that is embedded at the distal end of the cylinder body at a position closer to the distal end than the rod cover, and that is connected to the distal end of the piston rod and along the linear guide. A reciprocating member attached to a guide rail that is slidable in a direction parallel to the piston rod, wherein the guide rail moves together with the reciprocating member when the reciprocating member reciprocates in a linear direction. A fluid pressure actuator characterized by being guided by a guide. 2. The fluid pressure actuator according to claim 1, wherein said linear guide and said rod cover overlap in a direction perpendicular to a central axis of said piston rod. Actuator. 3. The fluid pressure actuator according to claim 1, wherein the linear guide has a guide groove that opens outward, and the guide rail that slides along the guide groove passes therethrough. A relief groove formed in the cylinder body.