JPH0734202U - Fluid pressure actuator - Google Patents

Abstract

(57) [Abstract] [Purpose] A guide rail and a rod 5 or a fixed portion provided with a cylinder tube (hereinafter referred to as a rod) is provided between a pair of end members 2 and 3 so that the rod 5 and the like can be moved relative to each other. Regarding the fluid pressure actuator that relatively moves the moving portion inserted into the guide rail along the guide rail, even if the guide rail of the fixed portion and the rod 5 or the like are not arranged exactly in parallel,
This prevents the moving portion that relatively moves along the guide rail from biting the rod 5 or the like or the piston provided on the rod 5. [Structure] Inserting concave portions 10 and 11 are provided in the end members 2 and 3, and the end portions 7 of the rod 5 and the like are provided in the inserting concave portions 10 and 11.
a, 8a is inserted, and the inner wall portion 10 of the insertion concave portion 10, 11 is inserted.
A radial gap 14 is provided between a and 11a and the ends 7a and 8a, and the rod 5 and the like are elastically supported by the elastic body 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvements in fluid pressure actuators.

[0002]

[Prior art]

 The applicant of the present application, as previously disclosed in Japanese Utility Model Laid-Open No. 4-19904, has a fixing portion provided with a guide rail and a rod between a pair of end members, and penetrates the rod so as to be relatively movable. It proposes a fluid pressure actuator that relatively moves the inserted moving portion along the guide rail.

[0003]

[Problems to be solved by the device]

 In the fluid pressure actuator having the above structure, the moving part is assembled with high accuracy on the guide rail of the fixed part, and is thereby always positioned with respect to the fixed part. Further, the guide rail and the rod of the fixed portion are rigidly fixed to the end member. Therefore, according to the fluid pressure actuator configured as described above, if the guide rail and the rod are not arranged exactly parallel to each other, the rod or the rod is provided with the moving portion that relatively moves along the guide rail during the relative movement of the moving portion. There is a problem that it can not move smoothly because it bites with the piston that was taken.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised to solve the above-mentioned problems in the prior art. In order to achieve this object, a guide rail and a rod are provided between a pair of end members. In a fluid pressure actuator that has a fixed portion and relatively moves a moving portion that penetrates the rod so as to be relatively movable, in the above-described guide rail, an insertion recess is provided in the end member, and the rod is inserted in the insertion recess. The end portion is inserted, a radial gap is provided between the inner wall portion of the insertion recess and the end portion, and the rod is elastically supported by the elastic body. The rod can be considered in place of the cylinder tube.

[0005]

[Action]

 The rod or cylinder tube elastically supported by the elastic body is in a kind of floating state, and when a load larger than a predetermined size is applied, the elastic body elastically deforms and changes its direction. Therefore, even if the guide rail and the rod or cylinder tube are not placed exactly parallel to each other, as the moving part moves along the guide rail, it is pushed by the moving part to reduce bite. Change direction.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway plan view of the fluid pressure actuator, and FIG. 2 is an enlarged view of an essential part of FIG.

In FIG. 1, first, reference numeral 1 is a fixed portion, and this fixed portion 1 has the following configuration.

That is, when the pair of end members 2 and 3 are arranged in parallel to each other, and the guide rail 4 is installed between the pair of end members 2 and 3 so as to be orthogonal to the end members 2 and 3. In each case, the rod 5 is installed in parallel with the guide rail 4. The guide rail 4 is rigidly fixed to the end members 2 and 3 by a plurality of bolts 6. The rod 5 is hollow and is axially divided into two parts, and a piston 9 is sandwiched between the divided bodies 7 and 8.

The divided bodies 7 and 8 of the rod 5 are inserted into the insertion concave portions 10 and 11 provided on the inner side surfaces of the end members 2 and 3 at the axial one end portions 7 a and 8 a, respectively, and the axial direction and the like. The end portions 7b and 8b are inserted into the insertion recess portions 12 and 13 provided on the axial end surface of the piston 9. As shown in an enlarged manner in FIG. 2, the inner wall portions (inner peripheral surfaces) 10a and 11a of the insertion recessed portions 10 and 11 of the end members 2 and 3 and the outer circumferences of the axial end portions 7a and 8a of the split bodies 7 and 8, respectively. A radial gap 14 having a predetermined width is set between the surfaces, and a position is lowered from the inner wall portions (inner peripheral surfaces) 10a, 11a of the insertion recesses 10, 11 to the outer peripheral side by one step. An elastic body 15 made of a rubber-like elastic material having an annular shape is interposed in a state of being appropriately compressed in the radial direction, whereby the divided bodies 7 and 8 are elastically supported by the elastic body 15. Further, although it is not clear from the drawing, the radial direction is also provided between the inner wall portion (inner peripheral surface) of the recessed portion 12, 13 for inserting the piston 9 and the outer peripheral surface of the axial other end portions 7b, 8b of the split bodies 7, 8. The gap is set.

Pressure supply ports 16 and 17 are provided on the outer side surfaces of the end members 2 and 3, respectively, so that the pressure supply ports 16 and 17 and the hollow portions 7c and 8c of the split bodies 7 and 8 communicate with each other. , Connection paths 18 and 19 are provided. Further, communication recesses 20 and 21 are provided on the axial end faces of the pistons 9 so as to partially communicate with the insertion recesses 12 and 13 so that the hollow portions 7c and 8c communicate with both chambers of the cylinder 34, which will be described later. ing. Further, shock absorbers 22 and 23 are attached to the end members 2 and 3, respectively, which act as a buffer when the moving portion 31 described later reaches the stroke limit of reciprocation.

In FIG. 1, reference numeral 31 is a moving unit, and the moving unit 31 has the following configuration.

That is, the substantially box-shaped table 32 is assembled on the guide rail 4 with high precision with relative movement freely along the longitudinal direction of the guide rail 4 via a linear motion bearing not shown. A substantially box-shaped cylinder body 33 having a built-in cylinder 34 combined with the piston 9 is combined with the rod 5 and the outer circumference of the piston 9 so as to be movable relative to each other. The table 32 and the cylinder body 33 are connected via a connecting fitting 35. It is connected. The divided bodies 7 and 8 of the rod 5 are inserted into end covers 36 and 37 at both ends of the cylinder 34 so as to be relatively movable.

On the front surface of the cylinder body 33, a pair of pressure supply ports 16 and 17 and a pair of pressure supply ports 38 and 39 that are selectively used are provided, and on both side surfaces of the cylinder body 33, respectively. A stopper 40 (only one of which is shown in the figure) that abuts the shock absorbers 22 and 23 is attached.

In the fluid pressure actuator having the above structure, for example, the fixed portion 1 is fixed to a mounting member (not shown), and a work (not shown) such as a machine tool is fixed to the table 32 of the moving portion 31. Upon receiving the supply of fluid pressure such as compressed air, the moving unit 31 linearly reciprocates together with the work. In this case, the guide rail 4 is fixed to the mounting member, and the pair of end members 2 and 3 are suspended in the air while being supported by the guide rail 4. Further, the guide rail 4 supports the table 32, the table 32 supports the cylinder body 33 via the connecting fitting 35, and the pair of end members 2 and 3 and the cylinder body 33 form the split bodies 7 and 8 of the rod 5 and the piston. 9 will be supported. On the contrary, the moving portion 31 may be fixed to the mounting member and the fixed portion 1 may be linearly reciprocated.

In any case, the fixed portion 1 and the moving portion 31 are positioned with high accuracy by the combination of the guide rail 4 and the table 32, while the divided bodies 7 and 8 of the rod 5 are moved by the elastic body 15. Even if the guide rails 4 and the divided bodies 7 and 8 of the rods 5 are not arranged exactly in parallel, the moving portion 31 is moved along the guide rails 4 because they are elastically supported and in a kind of float state. As they move, the divided bodies 7, 8 are pushed by the end covers 36, 37 or pushed by the inner wall of the cylinder 34 via the piston 9 to change their postures within the elastic range of the elastic body 15. That is, the divided bodies 7 and 8 turn together with the piston 9 in a direction to reduce bite.

Therefore, in the range of this operation, the relative movement of the moving portion 31 along the guide rail 4 during the relative movement of the moving portion 31 is prevented from being bitten by the split bodies 7 and 8 of the rod 5 or the piston 9. Therefore, the moving part 31 can be relatively moved relative to the conventional one. Further, this can reduce the dimensional tolerances of the related parts, which can improve the productivity. The effect is that a radial gap is set between the inner wall portions of the insertion recesses 12, 13 of the piston 9 and the outer peripheral surfaces of the other axial end portions 7b, 8b of the split bodies 7, 8, that is, the piston. The radial play is set between the split body 7 and 8 of the rod 9 and the rod 9 to be amplified. Further, the ring-shaped elastic body 15 has a sealing effect of preventing the pressure supplied to the cylinder 34 from leaking.

The rod 5 in the first embodiment can be considered by replacing it with a cylinder tube. That is, FIG. 3 is a partially cutaway plan view of a fluid pressure actuator according to another embodiment of the present invention, and FIG. 4 is an enlarged view of a main part of FIG.

In FIG. 3, first, reference numeral 1 is a fixed portion, and the fixed portion 1 has the following configuration.

That is, when the pair of end members 2 and 3 are arranged in parallel with each other, and the guide rail 4 is installed between the pair of end members 2 and 3 so as to be orthogonal to the end members 2 and 3. In both cases, the cylinder tube 51 is installed in parallel with the guide rail 4. The guide rail 4 is rigidly fixed to the end members 2 and 3 by a plurality of bolts 6. End covers 52 and 53 provided with flow paths 52a and 53a are attached to both ends of the cylinder tube 51, respectively. A piston 9 having a plurality of permanent magnets 54 arranged in the axial direction is reciprocally inserted inside the cylinder tube 51. When the piston 9 reciprocates inside the cylinder tube 51, a slider made of a magnetic material is used. A moving part 31 having a table 55 connected to the slider 55 is driven along the guide rail 4.

The cylinder tube 51 is inserted at its axial ends 51a and 51b into insertion recesses 10 and 11 provided on the inner side surfaces of the end members 2 and 3, respectively, and as shown in an enlarged view in FIG. Between the inner wall portions 10a, 11a of the insertion recesses 10, 11 of the end members 2, 3 and the outer peripheral surfaces of the axial end portions 51a, 51b of the cylinder tube 51, and the insertion recesses 10, 11 of the end members 2, 3 A radial gap 14 having a predetermined width is set between the inner wall portions 10a, 11a and the outer peripheral surfaces of the end covers 52, 53, respectively, and a mounting groove 52b provided on the outer peripheral surfaces of the end covers 52, 53. An elastic body 15 made of a rubber-like elastic material having an annular shape is interposed between the cylinders 53, 53b while being appropriately compressed in the radial direction, whereby the cylinder tube 51 is elastically supported by the elastic body 15. I have it.

Pressure supply ports 16 and 17 are provided on the outer side surfaces of the end members 2 and 3, respectively, and the pressure supply ports 16 and 17 communicate with the inside of the cylinder tube 51 via the flow paths 52a and 53a. ing. 22 and 23 are shock absorbers.

In the fluid pressure actuator having the above-mentioned configuration, for example, the fixed part 1 is fixed to a mounting member (not shown), and a work (not shown) such as a machine tool is fixed to the table 32 of the moving part 31. Upon receiving the supply of fluid pressure such as compressed air, the moving unit 31 linearly reciprocates together with the work. In this case, the guide rail 4 is fixed to the mounting member, and the pair of end members 2 and 3 are suspended in the air while being supported by the guide rail 4. On the contrary, the moving part 31 may be fixed to the mounting member and the fixed part 1 may be linearly reciprocated.

In any case, the fixed portion 1 and the moving portion 31 are positioned with high precision by the combination of the guide rail 4 and the table 32, while the cylinder tube 51 is elastically supported by the elastic body 15. As a result, the guide rail 4 and the cylinder tube 51 are not arranged exactly parallel to each other because they are in a kind of float state. Therefore, as the moving portion 31 moves along the guide rail 4, 51 is pushed by the slider 55 to change its posture within the elasticity range of the elastic body 15, that is, the cylinder tube 51 changes its direction in the direction of reducing bite.

Therefore, within the range of this operation, it is possible to prevent the moving portion 31 that relatively moves along the guide rail 4 from being bitten by the cylinder tube 51 during the relative movement of the moving portion 31, and thereby, The moving unit 31 can be relatively moved relative to the conventional one. Further, as a result, the dimensional tolerance of the related parts can be made gentle, so that the productivity can be improved. The end covers 52 and 53 may be omitted (see FIG. 5), and the elastic body 15 may be provided on the inner peripheral side of the cylinder tube 51 (see FIG. 6).

[0025]

[Effect of device]

 The present invention has the following effects. That is, since the rod or cylinder tube is elastically supported by the elastic body so as to support the rod or cylinder tube in a kind of float state, the guide rail and the rod or cylinder tube are accurately parallel to each other. Even if it is not arranged, the moving part can be prevented from biting the rod, the piston or the cylinder tube, which allows the moving part to travel more smoothly than before. In addition, this can reduce the dimensional tolerances of related parts, and thus improve the productivity.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a fluid pressure actuator according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a partially cutaway plan view of a fluid pressure actuator according to another embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a sectional view of a main part of a fluid pressure actuator according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts of a fluid pressure actuator according to another embodiment of the present invention.

[Explanation of symbols]

 1 Fixed part 2, 3 End member 4 Guide rail 5 Rod 6 Bolt 7,8 Divided body 7a, 8a Axial one end 7b, 8b Axial other end 7c, 8c Hollow part 9 Piston 10, 11 Insertion concave part 10a, 11a Inner wall part 12,13 Insertion concave part 14 Gap 15 Elastic body 16,17,38,39 Pressure supply port 18,19 Connection path 20,21 Communication concave part 22,23 Shock absorber 31 Moving part 32 Table 33 Cylinder body 34 Cylinder 35 Connection fittings 36, 37 End lid 40 Stopper 51 Cylinder tube 51a, 51b Axial end 52, 53 End cover 52a, 53a Flow path 52b, 53b Mounting groove 54 Permanent magnet 55 Slider

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Eiie Kiyoshi 4-3-1 Tsujido Shinmachi, Fujisawa City, Kanagawa NOK Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A fixing part (1) provided with a guide rail (4) and a rod (5) or a cylinder tube (51) between a pair of end members (2) and (3), and the rod (5). ) Or a fluid pressure actuator for relatively moving a moving portion (31) having a cylinder tube (51) inserted therein so as to be relatively movable, along the guide rail (4),
The end members (2) and (3) are provided with insertion recesses (10) and (11), and the insertion recesses (10) and (11) are provided with end portions (7) of the rod (5) or the cylinder tube (51).
a) (8a) (51a) (51b) is inserted, and the inner wall portions (10a) (11a) of the insertion recesses (10) (11) and the end portions (7a) (8a) (51a) (51b) are inserted. A radial gap (14) is provided therebetween and the rod (5) or the cylinder tube (51) is connected to the elastic body (1).
5) A fluid pressure actuator characterized in that it is elastically supported by.