JP2011017377A - Lubrication structure for fluid pressure cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubrication structure for a fluid pressure cylinder lubricating a circumference surface of a piston rod over a whole in a circumference direction while using a plurality of solid lubricants.SOLUTION: The plurality of sold lubricants 31 and a flat spring 32 are held in a holding member 33. A plurality of elastic projection pieces 35 projecting along a retraction direction of a piston rod 13 are formed on a bottom part 33a of the holding member 33 elastically deformably so as to extend in a circumference direction of the piston rod 13. Each of the plurality of solid lubricants 31 are retained in the holding member 33 by a retention projection in such a manner that the same can rotate as one unit with the holding member 33. An end surface 20b of a rod metal 20 is disposed ahead of the holding member 33 in a retraction direction of the piston rod 13.

Description

  The present invention relates to a lubricating structure for a fluid pressure cylinder.

  For example, in a fluid pressure cylinder used for workpiece clamping or unclamping, the peripheral surface of a piston rod is lubricated by directly applying lubricating oil such as hydraulic oil or grease. However, since the lubricating oil is gradually scraped off due to the sliding contact between the rod packing and the peripheral surface of the piston rod accompanying the reciprocating motion of the piston rod, the peripheral surface of the piston rod should be lubricated for a long period of time. Can not be.

  Thus, for example, an air cylinder disclosed in Patent Document 1 has been proposed as a fluid pressure cylinder capable of lubricating the peripheral surface of the piston rod for a long period of time. In the air cylinder of Patent Document 1, a plurality of solid lubricants are arranged around the piston rod, and all the solid lubricants are always pressed against the piston rod by leaf springs. When the piston rod reciprocates, the peripheral surface of the piston rod slides in contact with the solid lubricant, and the portion of the solid lubricant in sliding contact with the peripheral surface of the piston rod melts to form a peripheral surface of the piston rod. Can be lubricated. Further, even if the solid lubricant is reduced by melting, the solid lubricant is pressed against the piston rod by the leaf spring. Therefore, in the air cylinder of Patent Document 1, the solid lubricant is repeatedly melted, and the lubricating oil is applied to the peripheral surface of the piston rod. Compared with the case where is applied only once, the circumferential surface of the piston rod can be lubricated for a long period of time.

JP-A-49-20581

  However, in the air cylinder of Patent Document 1, in order to always press the solid lubricant against the piston rod by the leaf spring, it is necessary to divide the solid lubricant into a plurality of parts. For this reason, a gap is formed between adjacent solid lubricants, and there is a problem that the circumferential surface of the piston rod facing the gap does not slide against the solid lubricant and cannot be lubricated.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to make the circumferential surface of the piston rod the entire circumferential direction while using a plurality of solid lubricants. It is an object of the present invention to provide a fluid pressure cylinder lubrication structure that can be lubricated over a wide range.

  In order to achieve the above object, according to a first aspect of the present invention, a plurality of solid lubricants are arranged around a piston rod that protrudes and protrudes from a cylinder body, and the solid lubricant is disposed on a peripheral surface of the piston rod. A fluid pressure cylinder lubrication structure in which an opposing inner surface is formed along a part of the circumferential surface of the piston rod and the inner surface is pressed against the circumferential surface of the piston rod by a pressing member, the piston rod A housing member that accommodates the plurality of solid lubricants and the pressing member is rotatably disposed around the end surface of the piston rod at any end surface of the housing member in the protruding and retracting direction of the piston rod. An elastic protrusion protruding from the end face is formed so as to extend in the circumferential direction, and when the elastic protrusion is pressed, a restoring force to the original shape is generated. The holding member is provided with a holding projection for holding the solid lubricant in the containing member, and the elastic protruding piece is disposed at the tip of the containing member in the protruding and retracting direction. The gist of the invention is that an abutting portion that abuts is provided.

  According to a second aspect of the present invention, in the first aspect of the invention, the solid lubricant has a certain length along the radial direction from the inner surface to an outer surface outside the inner surface in the radial direction of the piston rod. The angle formed between the opposing side surfaces of the solid lubricant adjacent to each other in the circumferential direction of the piston rod is a value obtained by dividing 360 ° by the total number of the solid lubricants. The gist is that it is designed.

  According to this invention, the circumferential surface of the piston rod can be lubricated over the entire circumferential direction while using a plurality of solid lubricants.

The longitudinal cross-sectional view which shows the air cylinder in this embodiment. FIG. 2 is a sectional view taken along line AA in FIG. 1. Sectional drawing which shows a solid lubricant. The disassembled perspective view which shows the lubrication structure of an air cylinder. The perspective view which shows the lubrication structure of an air cylinder. The perspective view which shows the elastic protrusion of an accommodation member. (A) is sectional drawing which shows the state which the accommodating member moved to the axial direction, (b) is sectional drawing which shows the state which the accommodating member rotated in the circumferential direction. (A) And (b) is sectional drawing which shows the solid lubricant in another embodiment. The longitudinal cross-sectional view which shows a part of air cylinder in another embodiment.

Hereinafter, an embodiment in which the present invention is embodied in an air cylinder lubrication structure will be described with reference to FIGS.
As shown in FIG. 1, the air cylinder 11 has an outer shape formed by a cylinder body 12, and the cylinder body 12 is made of an aluminum alloy. A first supply / discharge port 12a is formed at a position near one axial end of the cylinder body 12, and a second supply / discharge port 12b is formed at a position near the other axial end of the cylinder body 12. . The other end side in the axial direction of the cylinder body 12 is sealed by the bottom 12c.

  A piston rod 13 is disposed in the cylinder body 12 so as to protrude from the cylinder body 12 so as to extend in the axial direction of the cylinder body 12. Also, a piston 14 that is movable along the axial direction of the cylinder body 12 by air is accommodated in the cylinder body 12. The piston 14 has an annular shape and is fitted into a protrusion 13a formed on the piston rod 13, so that the piston 14 and the piston rod 13 can move together. The piston 14 divides the cylinder body 12 into a first pressure working chamber 15 and a second pressure working chamber 16. The first pressure working chamber 15 communicates with the first supply / discharge port 12 a of the cylinder body 12, and the second pressure working chamber 16 communicates with the second supply / discharge port 12 b.

  An annular magnet 17 for detecting the piston position is embedded in the piston 14, and a rubber O-ring 14 a is attached to the outer peripheral surface of the piston 14. Further, a cushion member 18 made of an elastic body such as rubber is attached to an end portion of the piston 14 that faces the bottom portion 12c. Further, an annular cushion member 19 made of an elastic body such as rubber is provided at the end of the piston 14 on the piston rod 13 side.

  A rod metal 20 and an adapter 24 are disposed on the inner side of one end side in the axial direction of the cylinder body 12. The movement of the rod metal 20 and the adapter 24 from the inside of the cylinder body 12 along the axial direction of the cylinder body 12 to the outside of the cylinder body 12 is restricted by the circlip 21. The piston rod 13 is inserted into the rod metal 20 and the adapter 24 and supported by the rod metal 20 so as to be movable in the axial direction of the cylinder body 12. A mounting groove 20a is formed on the inner peripheral surface of the rod metal 20 so as to extend over the entire circumference of the rod metal 20, and a rubber rod packing 22 is mounted in the mounting groove 20a. A rubber O-ring 23 is attached to the outer peripheral surface of the rod metal 20. An annular recess 24a is formed on the inner peripheral side of the annular adapter 24.

  In the cylinder body 12, around the piston rod 13, an accommodation space K1 defined by a recess 24a of the adapter 24 and an end surface 20b of the rod metal 20 as a contact portion is formed. A housing member 33 is housed in the housing space K1.

  As shown in FIG. 4, the accommodation member 33 is formed in a bottomed annular shape having one surface opened and a bottom 33 a (end surface). The housing member 33 is housed in the housing space K <b> 1 in a state where the bottom portion 33 a is disposed on the side in which the piston rod 13 is immersed in the housing member 33 so that the bottom portion 33 a faces the end surface 20 b of the rod metal 20. . An insertion hole 33b through which the piston rod 13 is inserted is formed in the bottom 33a.

  As shown in FIG. 6, the bottom 33a of the housing member 33 includes a plurality of triangular elastic protrusions 35 formed so as to cut the bottom 33a outward from the housing member 33 (12 in this embodiment). Is provided. The plurality of elastic protrusions 35 are provided at equal intervals in the circumferential direction of the housing member 33, and as shown in FIG. 1, from the bottom 33 a to the end surface 20 b of the rod metal 20 along the immersion direction of the piston rod 13. It protrudes so as to extend.

  As shown in an enlarged view in FIG. 6, the elastic protruding piece 35 includes a first side 35 a that is a joint with the bottom 33 a, and a second side that is located on the radially outer side of the housing member 33 with respect to the first side 35 a. Part 35b and a third side part 35c connecting the first side part 35a and the second side part 35b. The elastic protruding piece 35 is based on the first side 35a so that the corner 35d, which is the position where the second side 35b and the third side 35c intersect, protrudes outward of the bottom 33a. It is formed by cutting and raising. The elastic protrusion 35 is deformable toward the bottom 33a when pressed against the end surface 20b of the rod metal 20, and is elastically deformable so as to return to the original shape when the pressure is released. A position to be cut up so as to return along the circumferential direction of the rod 13 is set.

  As shown in FIG. 1, the elastic protrusion 35 protrudes toward the end surface 20 b of the rod metal 20 in a state where the storage member 33 is stored in the storage space K <b> 1. Further, the housing member 33 is movable in the axial direction of the cylinder body 12 in the housing space K1. Further, as shown in FIG. 4, a plurality of holding projections 34 projecting inward of the housing member 33 are provided on the inner surface of the bottom portion 33 a at intervals so as to follow the circumferential direction (four in this embodiment). ) Is provided.

  As shown in FIG. 2, a plurality (four in this embodiment) of solid lubricants 31 made of molybdenum are arranged in the housing member 33. Each solid lubricant 31 is held by the holding protrusions 34 adjacent to each other so as to be integrally rotatable with the housing member 33, and is housed in the housing member 33 along the circumferential direction of the piston rod 13.

  As shown in FIG. 3, the inner surface 31 a of the solid lubricant 31 that faces the peripheral surface of the piston rod 13 is formed along a part of the peripheral surface of the piston rod 13. The length of the inner surface 31 a along the circumferential direction of the piston rod 13 is the same as the length of the outer surface 31 b outside the inner surface 31 a of the solid lubricant 31. The solid lubricant 31 is formed to have a certain length along the radial direction of the piston rod 13 from the inner surface 31a toward the outer surface 31b.

  In the solid lubricant 31, the angle θ formed between the opposing side surfaces 31 c of the solid lubricants 31 adjacent to each other in the circumferential direction of the piston rod 13 divides 360 ° by 4 that is the total number of the solid lubricants 31. It is designed to be 90 °. When the solid lubricant 31 designed in this way is arranged along the circumferential surface of the piston rod 13, the circumferential surface of the piston rod 13 is covered over the entire circumferential direction by the inner surface 31a of all the solid lubricants 31. It is like that.

  As shown in FIG. 5, a leaf spring 32 as a pressing member that presses the solid lubricant 31 toward the piston rod 13 is mounted between the inner peripheral surface of the housing member 33 and the outer surface 31 b of the solid lubricant 31. ing. The plate spring 32 is formed in an annular shape by overlapping both end sides of the strip plate-shaped plate spring 32, and is mounted so as to cover all the solid lubricant 31 from the outer surface 31b side. The inner diameter of the leaf spring 32 is smaller than the diameter of an imaginary circle passing through the apex of the outer surface 31b of all the solid lubricants 31.

Therefore, in this embodiment, the lubrication structure of the air cylinder 11 is formed by the solid lubricant 31, the leaf spring 32, and the housing member 33.
In the air cylinder 11 configured as described above, air is supplied to the first pressure working chamber 15 through the first supply / discharge port 12a, and air from the second pressure working chamber 16 is discharged through the second supply / discharge port 12b. Then, the piston 14 moves toward the bottom 12c, and the piston rod 13 moves in the immersion direction.

  On the other hand, when the air is supplied to the second pressure working chamber 16 through the second supply / discharge port 12b and the air in the first pressure working chamber 15 is discharged through the first supply / discharge port 12a, the piston 14 Moves toward the rod metal 20 and the piston rod 13 moves in the protruding direction.

  Since the circumferential surface of the piston rod 13 is in sliding contact with the inner surface 31 a of the solid lubricant 31 when the piston rod 13 moves in the immersion direction and the protruding direction, the inner surface 31 a of the solid lubricant 31 is the circumferential surface of the piston rod 13. It melts by friction. Lubricating oil is supplied to the circumferential surface of the piston rod 13 by melting the solid lubricant 31. Further, since the solid lubricant 31 is always pressed against the piston rod 13 by the leaf spring 32, the inner surface 31 a of the solid lubricant 31 is not in contact with the circumferential surface of the piston rod 13. Always in contact with the surrounding surface. And by the sliding contact of the piston rod 13 with respect to the inner surface 31a of the solid lubricant 31, the solid lubricant 31 is repeatedly melted, and the lubricating oil can be supplied to the peripheral surface of the piston rod 13 over a long period of time.

  Further, as shown in FIG. 7A, when the piston rod 13 moves in the immersing direction (the direction of the arrow X shown in FIG. 7), the solid lubricant 31 follows the movement of the piston rod 13 in the immersing direction. Then, it moves to the bottom 33 a side of the housing member 33. Then, the bottom 33a of the housing member 33 is pressed by the solid lubricant 31 and moves toward the end surface 20b of the rod metal 20 in the housing space K1. And the corner | angular part 35d of the elastic protrusion 35 contact | abuts to the end surface 20b of the rod metal 20 by the movement of the accommodating member 33, and the elastic protrusion 35 is pressed against the end surface 20b of the rod metal 20, thereby the elastic protrusion 35 is The corner 35d is distorted from the base point.

  Here, as shown in an enlarged view in FIG. 6, the elastic protrusion 35 on the bottom 33a is tilted from the connection point S1 between the first side 35a and the second side 35b before the elastic protrusion 35 is tilted. A length from the position of the corner portion 35d before being performed to a position S2 orthogonal to the bottom portion 33a is defined as a length Y1. Further, the length from the connection point S1 after the elastic projection 35 is tilted to the position S3 orthogonal to the bottom 33a from the position of the corner 35d after the elastic projection 35 is tilted on the bottom 33a. The length is Y2.

  Since the elastic projection piece 35 is tilted with the corner portion 35d as the base point, the length Y2 is longer than the length Y1, so that the housing member 33 is formed of the elastic projection piece 35 as shown in FIG. Rotate in the circumferential direction (the direction of the arrow R shown in FIG. 7B) with the corner portion 35d as a base point. At this time, since the solid lubricant 31 is held integrally with the housing member 33 by the holding protrusions 34, the solid lubricant 31 moves in the circumferential direction of the piston rod 13 while sliding on the circumferential surface of the piston rod 13.

  When the piston rod 13 moves in the projecting direction, the elastic protrusion 35 pressed against the end surface 20b of the rod metal 20 returns to the original shape, and the housing member 33 is made solid by the return force of the elastic protrusion 35. It returns to the position before being moved by being pressed by 31. Each time the piston rod 13 is repeatedly projected and retracted, the solid lubricant 31 moves in the circumferential direction of the piston rod 13, and the solid lubricant 31 is in sliding contact with the entire circumferential surface of the piston rod 13 in the circumferential direction. As a result, the circumferential surface of the piston rod 13 is lubricated over the entire circumferential direction.

In the above embodiment, the following effects can be obtained.
(1) The plurality of solid lubricants 31 and the leaf springs 32 are housed in the housing member 33, and elastic protrusions 35 projecting along the direction in which the piston rod 13 is inserted are formed on the bottom 33 a of the housing member 33. A plurality of rods 13 are formed so as to be elastically deformable so as to extend in the circumferential direction of the rod 13. Further, each of the plurality of solid lubricant materials 31 is held in the housing member 33 so as to be integrally rotatable with the housing member 33 by the holding projections 34, and further, the rod metal 20 is disposed ahead of the housing member 33 in the immersion direction of the piston rod 13. The end face 20b is arranged. Then, the elastic protruding piece 35 that contacts the end surface 20b of the rod metal 20 following the immersion of the piston rod 13 is tilted with the corner portion 35d as a base point, and the housing member 33 has the corner portion 35d as a base point. Simultaneously with the movement in the circumferential direction, the solid lubricant 31 moves in the circumferential direction of the piston rod 13. Accordingly, even if a gap is formed between the solid lubricants 31 adjacent to each other in the circumferential direction of the piston rod 13, the solid lubricant 31 is moved to the piston rod 13 by moving the solid lubricant 31 in the circumferential direction of the piston rod 13. Thus, the circumferential surface of the piston rod 13 can be lubricated over the entire circumferential direction.

  (2) The elastic member 35 is moved in the circumferential direction of the piston rod 13 as the elastic protrusion 35 is tilted due to the contact of the elastic metal piece 35 with the end surface 20b of the rod metal 20, and at the same time, the solid lubricant 31 is moved to the piston rod. 13 circumferential directions can be moved. For this reason, for example, even if the inner surface 31a of one solid lubricant 31 is unevenly worn and a portion where the solid lubricant 31 does not slide on the peripheral surface of the piston rod 13 is formed, the solid lubricant 31 is fixed to the piston rod. The circumferential surface of the piston rod 13 can be lubricated by another solid lubricant 31 by moving in the circumferential direction 13.

  (3) The length of the inner surface 31a of the solid lubricant 31 along the circumferential direction of the piston rod 13 is the same as the length of the outer surface 31b of the solid lubricant 31, and the solid lubricant 31 It is formed so as to have a certain length along the radial direction of the piston rod 13 from 31a to the outer surface 31b. Further, in the solid lubricant 31, the angle θ formed between the opposing side surfaces 31 c of the solid lubricant 31 adjacent in the circumferential direction of the piston rod 13 is 360 °, which is the total number of the solid lubricants 31 4. It is designed to be 90 ° divided by. When the solid lubricant 31 designed in this way is arranged along the circumferential surface of the piston rod 13, the circumferential surface of the piston rod 13 is covered by the inner surface 31a of each solid lubricant 31 over the entire circumference. Therefore, even if the solid lubricant 31 is reduced due to the appearance of the piston rod 13, the peripheral surface of the piston rod 13 can always be covered over the entire circumference with the inner surfaces 31 a of the plurality of solid lubricants 31.

  (4) When the housing member 33 rotates in the circumferential direction, the solid lubricant 31 moves in the circumferential direction of the piston rod 13 while sliding on the circumferential surface of the piston rod 13. Therefore, even if the inner surface 31a of the solid lubricant 31 is unevenly worn due to the sliding contact between the inner surface 31a of the solid lubricant 31 and the peripheral surface of the piston rod 13 due to the protrusion and withdrawal of the piston rod 13, the inner surface 31a of the solid lubricant 31 is Melting is performed along the circumferential surface of the piston rod 13. As a result, the inner surface 31 a of the solid lubricant 31 can be the same round surface as the peripheral surface of the piston rod 13.

  (5) A leaf spring 32 is disposed between the inner peripheral surface of the housing member 33 and the outer surface 31 b of the solid lubricant 31, and the solid lubricant 31 is always pressed against the piston rod 13 by the leaf spring 32. . Therefore, even if the peripheral surface of the piston rod 13 is melted by slidingly contacting the inner surface 31 a of the solid lubricant 31, the inner surface 31 a of the solid lubricant 31 is pressed against the peripheral surface of the piston rod 13, The sliding contact between the surface and the inner surface 31 a of the solid lubricant 31 is repeated, and the lubricating oil can be supplied to the peripheral surface of the piston rod 13 for a long period of time.

In addition, you may change the said embodiment as follows.
In the embodiment, the number of the solid lubricant materials 31 arranged around the piston rod 13 is not limited to four, but may be two, three, or five or more. For example, as shown in FIG. 8A, eight solid lubricants 51 are arranged around the piston rod 13. An inner surface 51 a facing the peripheral surface of the piston rod 13 in the solid lubricant 51 is formed along a part of the peripheral surface of the piston rod 13. The length of the inner surface 51 a along the circumferential direction of the piston rod 13 is the same as the length of the outer surface 51 b outside the inner surface 51 a of the solid lubricant 51. The solid lubricant 51 is formed to have a certain length along the radial direction of the piston rod 13 from the inner surface 51a to the outer surface 51b. In the solid lubricant 51, the angle θ formed between the opposing side surfaces 51 c of the solid lubricant 51 adjacent in the circumferential direction of the piston rod 13 is divided by 360, which is the total number of the solid lubricants 51. It is designed to be 45 °.

  As shown in FIG. 8B, three solid lubricants 61 may be arranged around the piston rod 13. An inner surface 61 a of the solid lubricant 61 facing the peripheral surface of the piston rod 13 is formed along a part of the peripheral surface of the piston rod 13. The length of the inner surface 61 a along the circumferential direction of the piston rod 13 is the same as the length of the outer surface 61 b outside the inner surface 61 a of the solid lubricant 61. The solid lubricant 61 is formed to have a certain length along the radial direction of the piston rod 13 from the inner surface 61a to the outer surface 61b. In the solid lubricant 61, the angle θ formed between the opposing side surfaces 61 c of the solid lubricants 61 adjacent in the circumferential direction of the piston rod 13 is divided by 360, which is the total number of the solid lubricants 61. It is designed to be 120 °.

  In the embodiment, the housing member 33 is defined by the recess 24 a of the adapter 24 and the end surface 20 b of the rod metal 20 in the cylinder body 12 in a state where the solid lubricant 31 and the leaf spring 32 are housed in the housing member 33. Although it accommodated in the accommodation space K1 formed, it is not restricted to this. For example, as shown in FIG. 9, even when the accommodating member 33 in a state where the solid lubricant 31 and the leaf spring 32 are accommodated is accommodated in the accommodating space K <b> 2 in the accommodating housing 71 joined to the cylinder body 12. Good. An insertion hole 71 b through which the piston rod 13 is inserted is formed in the bottom 71 a of the housing 71 for accommodation. In addition, an adapter 72 is provided in the housing 71, and the adapter 72 has a recess 72a. The housing member 33 in which the solid lubricant 31 and the leaf spring 32 are housed is housed in the housing space K2 that is defined by the recess 72a of the adapter 72 and the inner surface 71c of the bottom 71a. That is, the accommodating member 33 may be accommodated in an accommodating housing 71 that is externally attached to the cylinder body 12. In this case, the elastic protruding piece 35 of the housing member 33 comes into contact with the inner surface 71 c of the bottom 71 a of the housing 71 for housing and is elastically deformed. That is, the inner surface 71c functions as a contact portion.

  In the embodiment, the angle formed between the opposing side surfaces 31c of the solid lubricant 31 adjacent in the circumferential direction of the piston rod 13 is a value obtained by dividing 360 ° by 4 that is the total number of the solid lubricants 31. The solid lubricant 31 may be designed at an angle that does not.

  In the embodiment, in the state where the housing member 33 is housed in the housing space K1, the elastic protrusion 35 protrudes toward the end surface 20b of the rod metal 20, but this is not restrictive. For example, the accommodation member 33 may be inverted and accommodated in the accommodation space K <b> 1 so that the elastic protrusion 35 protrudes toward the bottom surface of the adapter 24. In this case, the housing member 33 is pressed by the movement of the solid lubricant 31 following the movement of the piston rod 13 in the projecting direction, and the housing member 33 is within the housing space K1 and the bottom surface of the recess 24a in the adapter 24. Move towards. Then, the elastic protrusion 35 is elastically deformed by coming into contact with the bottom surface of the adapter 24, and the housing member 33 rotates.

  In the embodiment, an annular leaf spring 32 is provided on the outer surface 31b of the solid lubricant 31 as a pressing member. However, the present invention is not limited to this, and for example, a coil spring is provided on the outer surface 31b of each solid lubricant 31 as a pressing member. The other end may be fixed to the inner peripheral surface of the housing member 33, and each solid lubricant 31 may be pressed against the piston rod 13 by a coil spring.

  In the embodiment, the inner surface 31a of the solid lubricant 31 is formed along a part of the circumferential surface of the piston rod 13, and the solid lubricant 31 extends along the radial direction of the piston rod 13 from the inner surface 31a to the outer surface 31b. However, the present invention is not limited to this. For example, the outer surface 31b of the solid lubricant 31 is formed along the inner peripheral surface of the leaf spring 32 so that there is no gap between the outer surface 31b and the leaf spring 32. The leaf spring 32 causes the solid lubricant 31 to be a piston rod. 13 may be pressed evenly.

  In the embodiment, the shape of the elastic protruding piece 35 is a triangular shape. However, the shape of the elastic protruding piece 35 is not limited to this, and the shape of the elastic protruding piece 35 is formed so as to generate a restoring force to the original shape when pressed. If it is, it will not specifically limit.

In the embodiment, twelve elastic protrusions 35 are provided at equal intervals in the circumferential direction of the housing member 33. However, the number is not limited thereto, and may be 1 to 11, or 13 or more. .
In the embodiment, the solid lubricant 31 made of molybdenum is used. However, the present invention is not limited to this. For example, a solid lubricant made of fluorine, lithium, or graphite may be used.

The fluid pressure cylinder lubrication structure of the present invention is embodied in the air cylinder 11 lubrication structure, but is not limited thereto, and may be embodied in, for example, a hydraulic cylinder lubrication structure.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.

  (A) Four solid lubricants are provided around the piston rod, and an angle formed between opposing side surfaces of the solid lubricants adjacent to each other in the circumferential direction of the piston rod is 90 °. 3. The fluid pressure cylinder lubrication structure according to claim 1, wherein the lubricating structure is designed as described above.

  (B) The housing member is housed in a housing space defined in the cylinder block, according to any one of claims 1 and 2, and the technical idea (a). The lubricating structure of the fluid pressure cylinder described.

  (C) The lubricating structure for a fluid pressure cylinder according to any one of claims 1 and 2, and the technical ideas (a) and (b), wherein the solid lubricant is made of molybdenum.

  DESCRIPTION OF SYMBOLS 11 ... Air cylinder as fluid pressure cylinder, 12 ... Cylinder body, 13 ... Piston rod, 20b ... End face of rod metal as contact part, 31, 51, 61 ... Solid lubricant, 31a, 51a, 61a ... Inner surface, 31b, 51b, 61b ... outer surface, 31c, 51c, 61c ... side face, 32 ... leaf spring as pressing member, 33 ... receiving member, 33a ... bottom part as end face, 34 ... holding projection, 35 ... elastic protrusion, 71c ... The inner surface of the bottom of the housing for accommodation as the contact portion.

Claims (2)

A plurality of solid lubricants are arranged around the piston rod that protrudes and protrudes from the cylinder body, and the solid lubricant is formed so that the inner surface facing the peripheral surface of the piston rod is along a part of the peripheral surface of the piston rod. And a lubricating structure of a fluid pressure cylinder in which the inner surface is pressed against the peripheral surface of the piston rod by a pressing member,
Around the piston rod, a housing member that houses the plurality of solid lubricants and the pressing member is rotatably arranged, and any one end surface of the housing member in the protruding and retracting direction of the piston rod An elastic protrusion that protrudes from the end face so as to extend in the circumferential direction of the piston rod is formed, and the elastic protrusion is formed to generate a restoring force to the original shape when pressed.
The housing member is provided with a holding projection for holding the solid lubricant in the housing member, and the elastic projecting piece comes into contact with the tip of the housing member in the protruding and retracting direction. A lubricating structure for a fluid pressure cylinder, characterized in that a portion is provided. The solid lubricant is formed to have a certain length along the radial direction from the inner surface to the outer surface outside the inner surface in the radial direction of the piston rod,
The angle formed between the opposing side surfaces of the solid lubricant adjacent in the circumferential direction of the piston rod is designed to be a value obtained by dividing 360 ° by the total number of the solid lubricants. The lubricating structure of a fluid pressure cylinder according to claim 1, wherein the fluid pressure cylinder has a lubricating structure.

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