JP4782173B2 - Actuator greasing mechanism - Google Patents

Description

  The present invention relates to an actuator for converting input energy into physical motion, and more particularly to a grease supply mechanism for an actuator including a collet member.

  Conventionally, an actuator configured to reciprocate a piston using compressed air or the like has been used in various fields.

FIG. 3 shows a cross-sectional view of a conventional actuator.
As shown in FIG. 3, the actuator 20 includes a tubular housing member 21, and the wall portion 21 a of the housing member 21 has a cylinder portion 21 b at one end.
The piston 22 is formed in a hollow shape including a cylindrical portion 22a and a bottom portion 22b, and the piston 22 is slidably disposed inside the cylinder portion 21b of the wall portion 21a. The piston 22 is disposed so as to form an air chamber 23 between the bottom 22b and the cylinder 21b in the internal space of the cylinder 21b.
Further, a spring 24 is provided between the bottom 22 b of the piston 22 and the wall 21 a of the housing member 21. Thereby, when air flows into the air chamber 23, the piston 22 slides in the longitudinal direction of the housing member 21 inside the cylinder portion 21 a against the spring 24.

A rod member 25 that can reciprocate in the longitudinal direction of the housing member 21 together with the piston 22 is disposed inside the cylindrical portion 22 a of the piston 22. The rod member 25 has a thread groove 25a formed on the outer surface.
A collet member 26 is disposed between the cylindrical portion 22 a of the piston 22 and the rod member 25. The collet member 26 is formed in a cylindrical shape, and a plurality of slits (not shown) are provided along the longitudinal direction of the housing member 21.
On the outer surface of the end portion 26a of the collet member 26, a tapered portion 26b is formed that is inclined outward in the radial direction. On the other hand, on the inner surface of the end portion 26a of the collet member 26, a thread portion 26c is formed.

  From the above configuration, in the actuator 20, when air flows into the air chamber 23, the piston 22 moves in the longitudinal direction of the housing member 21, and the inner surface of the tip 22 c of the piston 22 is the tapered portion 26 b of the collet member 26. To touch. At that time, the collet member 26 is deformed inward in the radial direction, and the screw portion 26c of the collet member 26 and the screw groove 25a of the rod member 25 are engaged. Thereby, the rod member 25 moves in the longitudinal direction of the housing member 21 together with the piston 22.

On the other hand, Patent Document 1 discloses a brake actuator in which a collet-type slack adjusting device is incorporated.
The brake actuator 10 of Patent Document 1 includes a cylindrical housing member 14 as in the above-described conventional example, and inside the housing member 14, as in the above-described conventional example, a piston member 16 and a collet-type slack. An adjusting device 20 and a threaded rod member 28 are disposed.
Japanese Patent No. 2659175

In the case of the above-described conventional configuration, a large load is applied to the tapered portion 26 b of the collet member 26 from the tip portion 22 c of the piston 22. Therefore, when assembling the actuator 20 so that no seizure or the like occurs between the piston 22 and the collet member 26, grease (lubrication) is provided between the tip 22c of the piston 22 and the tapered portion 26b of the collet member 26. Agent) is applied in advance.
However, when the actuator is operated for a long period of time, the piston 22 reciprocates many times, so that the grease applied to the piston 22 and the tapered portion 26b of the collet member 26 disappears. As a result, there is a possibility that seizure occurs between the tip 22c of the piston 22 and the tapered portion 26b of the collet member 26, and the piston 22 becomes hard and cannot move. For this reason, in the conventional configuration, the grease is applied again to the tip portion 22c of the piston 22 and the tapered portion 26b of the collet member 26 during the periodic inspection. Thus, when reapplying grease, it is necessary to disassemble all members of the actuator 20 in the conventional configuration.

  The present invention has been made in view of such a situation, and an object thereof is to provide a grease supply mechanism for an actuator capable of reducing labor for maintenance and inspection of grease applied to a piston and a collet member. That is.

  In order to solve the above-described problems of the prior art, in the present invention of claim 1, the housing member is formed in a tubular shape, and is arranged so as to partition an air chamber in the internal space of the housing member. A hollow piston configured to reciprocate in the longitudinal direction of the piston, and is disposed in the inner space of the piston, and has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston. The rod member is disposed so as to be interposed between the piston and the rod member, and when the air flows into the air chamber, the piston contacts the outer surface so that the inner surface is engaged with the rod member. And a collet member configured to mate with each other, wherein the wall portion of the housing member has an inner surface from an outer surface of the wall portion. A first lubricating groove extending in a circumferential direction at a position corresponding to the greasing hole is formed on the outer surface of the piston. A plurality of communication holes communicating from the outer surface to the inner surface of the piston are provided at intervals along the first circumferential groove.

  In a second aspect of the present invention, a second circumferential groove extending in the circumferential direction is formed on the inner surface of the wall portion of the housing member at a position corresponding to the greasing hole.

  In a third aspect of the present invention, the housing is formed in a tubular shape, and the hollow member is configured to reciprocate in the longitudinal direction of the housing member, and is arranged so as to define an air chamber in the internal space of the housing member. A piston member, a rod member that is disposed in an internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston, the piston and the rod member, A collet member arranged so as to interpose the rod member when the air flows into the air chamber so that the piston comes into contact with the outer surface. The actuator has a greasing mechanism, and a concave portion is provided on the inner surface of the piston at a position in contact with the collet member.

  In this invention of Claim 4, the said recessed part is formed so that it may extend in the circumferential direction.

  In this invention of Claim 5, it is arrange | positioned so that an air chamber may be divided in the internal space of this housing member, and the inside of this housing member, The hollow shape comprised so that reciprocation was possible in the longitudinal direction of the said housing member A piston member, a rod member that is disposed in an internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston, the piston and the rod member, A collet member arranged so as to interpose the rod member when the air flows into the air chamber so that the piston comes into contact with the outer surface. In the actuator greasing mechanism, a concave portion is provided on the outer surface of the collet member at a position in contact with the piston.

  In this invention of Claim 6, the said recessed part is formed so that it may extend in the circumferential direction.

  In this invention of Claim 7, it is arrange | positioned so that an air chamber may be divided in the internal space of this housing member and the inside of this housing member, The hollow shape comprised so that reciprocation was possible in the longitudinal direction of the said housing member A piston member, a rod member that is disposed in an internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston, the piston and the rod member, A collet member arranged so as to interpose the rod member when the air flows into the air chamber so that the piston comes into contact with the outer surface. And a wall portion of the housing member that communicates from the outer surface of the wall portion to a position corresponding to the piston on the inner surface. A greasing hole is provided, and a first circumferential groove extending in the circumferential direction is formed on the outer surface of the piston at a position corresponding to the greasing hole, and the piston has an inner surface from the outer surface of the piston. A plurality of communication holes that communicate with each other are provided at intervals along the first circumferential groove, and a recess is provided on the inner surface of the piston at a position in contact with the collet member.

  In this invention of Claim 8, the 2nd circumferential groove extended in the circumferential direction in the position corresponding to the said greasing hole is formed in the inner surface of the said wall part of the said housing member.

  In the present invention of claim 9, the recess is formed to extend in the circumferential direction.

  As described above, according to the grease supply mechanism of the actuator according to the present invention, the housing member is formed in a tubular shape, and is arranged so as to partition the air chamber in the internal space of the housing member. A hollow piston configured to be reciprocally movable, and a rod member that is disposed in the inner space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston. And when the air flows into the air chamber, the piston comes into contact with the outer surface so that the inner surface engages with the rod member. And a collet member configured as described above, wherein the wall portion of the housing member is provided on the inner surface from the outer surface of the wall portion. A greasing hole communicating to a position corresponding to the piston is provided, and a first circumferential groove extending in a circumferential direction is formed on the outer surface of the piston at a position corresponding to the greasing hole. Since a plurality of communication holes communicating from the outer surface to the inner surface of the piston are provided at intervals along the first circumferential groove, when grease is introduced from the greasing hole, the grease is The outer surface of the piston flows along the groove in the circumferential direction, and then the grease flows between the piston and the collet member through the communication hole. Thus, according to the grease supply mechanism of the actuator which concerns on this invention, grease can be supplied between a piston and a collet member, without separating each member of an actuator. Thereby, the effort of the maintenance inspection of the grease apply | coated to the piston and the collet member can be reduced compared with the past.

  Furthermore, according to the grease supply mechanism of the actuator according to the present invention, the second peripheral groove extending in the circumferential direction is formed on the inner surface of the wall portion of the housing member at a position corresponding to the grease supply hole. Therefore, when grease is introduced from the greasing hole, the grease flows in the circumferential direction on the outer surface of the piston by both the first circumferential groove and the second circumferential groove. Thus, the grease flowing on the outer surface of the piston can easily flow, and as a result, the grease can be supplied more easily between the piston and the collet member.

  Further, according to the grease supply mechanism of the actuator according to the present invention, the housing member is formed in a tubular shape, and is arranged so as to partition the air chamber in the internal space of the housing member, and reciprocates in the longitudinal direction of the housing member. A hollow-shaped piston configured to be capable of being configured, and a rod member that is disposed in the internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston; It is arranged so as to be interposed between the piston and the rod member, and is configured such that when the air flows into the air chamber, the inner surface engages with the rod member when the piston contacts the outer surface. An actuator greasing mechanism including a collet member formed on the inner surface of the piston at a position in contact with the collet member. Because it is kicked, may be when assembling the actuator, previously accumulated grease in the recess of the inner surface of the piston. When the actuator is operated, the grease accumulated in the recess comes out of the recess as the piston reciprocates, and is applied between the piston and the collet member. As a result, the period until the grease disappears is longer than in the prior art, so that the number of maintenance inspections by disengaging each member of the actuator can be reduced. As a result, it is possible to reduce labor for maintenance and inspection of the grease applied to the piston and the collet member.

  Further, according to the grease supply mechanism of the actuator according to the present invention, since the concave portion is formed so as to extend in the circumferential direction, when the actuator is assembled, the grease is accumulated over the entire circumferential direction of the inner surface of the piston. I can leave. As a result, the period until the grease disappears becomes longer, so that the number of maintenance inspections by separating each member of the actuator can be reduced. As a result, it is possible to further reduce the maintenance work of the grease applied to the piston and the collet member.

  Further, according to the grease supply mechanism of the actuator according to the present invention, the housing member is formed in a tubular shape, and is arranged so as to partition the air chamber in the internal space of the housing member, and reciprocates in the longitudinal direction of the housing member. A hollow-shaped piston configured to be capable of being configured, and a rod member that is disposed in the internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston; It is arranged so as to be interposed between the piston and the rod member, and is configured such that when the air flows into the air chamber, the inner surface engages with the rod member when the piston contacts the outer surface. An actuator greasing mechanism comprising a collet member formed on the outer surface of the collet member at a position in contact with the piston. Because it is kicked, may be when assembling the actuator, previously accumulated grease in the recess of the outer surface of the collet member. When the actuator is operated, the grease accumulated in the recess comes out of the recess as the piston reciprocates, and is applied between the piston and the collet member. As a result, the period until the grease disappears is longer than in the prior art, so that the number of maintenance inspections by disengaging each member of the actuator can be reduced. As a result, it is possible to reduce labor for maintenance and inspection of the grease applied to the piston and the collet member.

  Further, according to the grease supply mechanism for an actuator according to the present invention, since the concave portion is formed to extend in the circumferential direction, when the actuator is assembled, the grease is accumulated over the entire circumferential direction of the outer surface of the collet member. I can keep it. As a result, the period until the grease disappears becomes longer, so that the number of maintenance inspections by separating each member of the actuator can be reduced. As a result, it is possible to further reduce the maintenance work of the grease applied to the piston and the collet member.

Further, according to the grease supply mechanism of the actuator according to the present invention, the housing member is formed in a tubular shape, and is arranged so as to partition the air chamber in the internal space of the housing member, and reciprocates in the longitudinal direction of the housing member. A hollow-shaped piston configured to be capable of being configured, and a rod member that is disposed in the internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston; It is arranged so as to be interposed between the piston and the rod member, and is configured such that when the air flows into the air chamber, the inner surface engages with the rod member when the piston contacts the outer surface. An actuator greasing mechanism including a collet member formed on the wall portion of the housing member from the outer surface to the inner surface of the wall portion. A first lubrication hole extending in the circumferential direction at a position corresponding to the grease supply hole is formed on the outer surface of the piston, A plurality of communication holes communicating from the outer surface to the inner surface of the piston are provided at intervals along the first circumferential groove, and a recess is provided on the inner surface of the piston at a position in contact with the collet member. Therefore, when grease is inserted from the greasing hole, the grease flows in the circumferential direction along the first circumferential groove on the outer surface of the piston, and thereafter, the grease passes between the piston and the collet member through the communication hole. Will flow into. Thus, according to the grease supply mechanism of the actuator which concerns on this invention, grease can be supplied between a piston and a collet member, without separating each member of an actuator.
Moreover, since the recessed part is provided in the inner surface of a piston in the position which contacts the said collet member, the grease supplied from the greasing hole can be stored in the recessed part of the inner surface of a piston. When the actuator is operated, the grease accumulated in the recess comes out of the recess as the piston reciprocates, and is applied between the piston and the collet member. Thereby, since the period until grease disappears becomes long, the frequency | count of supplying grease from a greasing hole can be decreased. As described above, it is possible to reduce the trouble of maintenance and inspection of the grease applied to the piston and the collet member as compared with the conventional case.

  Moreover, according to the grease supply mechanism of the actuator which concerns on this invention, the 2nd circumferential groove extended in the circumferential direction in the position corresponding to the said grease supply hole is formed in the inner surface of the said wall part of the said housing member. Therefore, when grease is introduced from the greasing hole, the grease flows in the circumferential direction on the outer surface of the piston by both the first circumferential groove and the second circumferential groove. Thus, the grease flowing on the outer surface of the piston can easily flow, and as a result, the grease can be supplied more easily between the piston and the collet member.

  Moreover, according to the grease supply mechanism of the actuator which concerns on this invention, since the said recessed part is formed so that it may extend in the circumferential direction, the grease supplied from the grease hole is accumulated over the whole circumferential direction of the piston inner surface. be able to. Thereby, since the period until grease disappears becomes longer, the frequency | count of supplying grease from a greasing hole can be decreased. As a result, it is possible to further reduce the maintenance work of the grease applied to the piston and the collet member.

  Hereinafter, an actuator grease supply mechanism according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an actuator greasing mechanism according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

As shown in FIGS. 1 and 2, the actuator 1 according to the embodiment of the present invention includes a tubular housing member 2. The housing member 2 has a wall 2a, and a cylinder 2b is provided at one end of the wall 2a.
A bush 3 is disposed inside the cylinder portion 2 b of the housing member 2. The bush 3 is formed in a tubular shape, and the outer surface 3 a of the bush 3 is fixed in contact with the inner surface 2 c of the wall portion 2 a of the housing member 2.

As shown in FIGS. 1 and 2, a piston 4 is disposed inside the bush 3. The piston 4 is formed in a hollow shape including a cylindrical portion 4 a and a bottom portion (not shown), and the piston 4 is slidably disposed inside the bush 3.
Further, the piston 4 is disposed so as to form an air chamber (not shown) between the bottom portion and one end of the cylinder portion 2 b of the housing member 2. Further, a spring (not shown) is provided between the bottom of the piston 4 and the wall 2 a of the housing member 2. Accordingly, the piston 4 is configured to slide in the longitudinal direction of the housing member 2 inside the bush 3 against the spring when air flows into the air chamber.
In addition, the structure of the bottom part of the above-mentioned piston which is not illustrated, an air chamber, a spring, etc. is the same structure as the prior art example of FIG.

  As shown in FIGS. 1 and 2, a rod member 5 that can reciprocate in the longitudinal direction of the housing member 2 together with the piston 4 is disposed inside the cylindrical portion 4 a of the piston 4. The rod member 5 has a thread groove 5a formed on the outer surface.

As shown in FIGS. 1 and 2, a collet member 6 is disposed between the cylindrical portion 4 a of the piston 4 and the rod member 5. The collet member 6 is formed in a cylindrical shape, and a plurality of slits 6 a are provided along the longitudinal direction of the housing member 2. As a result, the collet member 6 is deformed inward in the radial direction when a force is applied from the piston 4.
In addition, a tapered portion 6 c that is inclined toward the radially outer side is formed on the outer surface of the end portion 6 b of the collet member 6. On the other hand, on the inner surface of the end portion 6b of the collet member 6, a screw portion 6d is formed.

  As shown in FIGS. 1 and 2, a ring-shaped positioning member (spacer) 7 is disposed between the cylindrical portion 4 a of the piston 4 and the collet member 6. The positioning member 7 prevents the collet member 6 from rotating with respect to the piston 4 by connecting the tip portion 4 b of the cylindrical portion 4 a of the piston 4 and the end portion 6 b of the collet member 6.

  In the actuator 1 according to the embodiment of the present invention, from the above configuration, when air flows into the air chamber, first, the piston 4 moves in the longitudinal direction of the housing member 2, whereby the tip 4 b of the piston 4 is moved. The inner surface contacts the tapered portion 6 c of the collet member 6. Then, when the collet member 6 is deformed radially inward, the screw portion 6d of the collet member 6 and the screw groove 5a of the rod member 5 are engaged, and the rod member 5 together with the piston 4 is the longitudinal length of the housing member 2. Will move in the direction.

In the actuator 1 according to the embodiment of the present invention, as shown in FIGS. 1 and 2, the wall portion 2 a of the housing member 2 is provided with a greasing hole 8 that communicates from the outer surface of the wall portion 2 a to the inner surface. ing. Here, the greasing hole 8 extends to a position corresponding to the outer surface of the bush 3. Further, the inner surface 2 c of the wall 2 a of the housing member 2 is provided with an inner peripheral groove 9 (second peripheral groove) that extends in the circumferential direction at a position corresponding to the greasing hole 8.
The bush 3 is provided with a plurality of through-holes 10 communicating from the outer surface to the inner surface of the bush 3 along the inner circumferential groove 9. The through hole 10 of the bush 3 is provided at a position corresponding to the tip portion 4 b of the piston 4.

As shown in FIGS. 1 and 2, the outer surface of the piston 4 is formed with an outer circumferential groove 11 (first circumferential groove) extending in the circumferential direction at a position corresponding to the through hole 10 of the bush 3. . Here, the outer circumferential groove 11 of the piston 4 is configured such that the position of the through hole 10 of the bush 3 in the longitudinal direction of the housing member 2 coincides when the air in the air chamber is extracted.
Further, the piston 4 is provided with a plurality of communication holes 12 that communicate from the outer surface to the inner surface of the piston 4 at intervals along the outer circumferential groove 11. In addition, the communication hole 12 of the piston 4 is disposed so as to be positioned above the tapered portion 6c of the collet member 6, so that the position does not overlap with the slit 6a of the collet member 6.
In addition, as shown in FIG. 2, the through hole 10 of the bush 3 and the communication hole 12 of the piston 4 are arranged so that their positions coincide with each other in the circumferential direction. Here, the positions of the through hole 10 and the communication hole 12 do not necessarily coincide with each other, and may be arranged so as to be shifted in the circumferential direction. This is because even if the positions are shifted, the grease flows along the outer peripheral groove 11 and the grease flows from the through hole 10 to the communication hole 12.

  Further, as shown in FIG. 1, a concave portion 13 is provided on the inner surface of the tip portion 4 b of the piston 4 at a position in contact with the tapered portion 6 c of the collet member 6. The recess 13 is formed to extend in the circumferential direction.

Next, the flow of grease when supplying grease using the grease supply mechanism of the actuator 1 according to the embodiment of the present invention will be described.
In the grease supply mechanism of the actuator 1 according to the embodiment of the present invention, grease is press-fitted into the grease supply hole 8 from the outside of the housing member 2 using a grease gun or the like in a state where air is extracted from the air chamber. The grease introduced from the greasing hole 8 flows in the circumferential direction on the outer surface of the bush 3 along the inner circumferential groove 9 of the wall portion 2a, and passes through the through hole 10 to the outer surface of the tip portion 4b of the piston 4. It flows toward. Thereafter, the grease flows in the circumferential direction on the outer surface of the piston 4 along the outer circumferential groove 11 of the piston 4, passes through the communication hole 12, and flows between the piston 4 and the collet member 6.
As a result, grease is applied to the inner surface of the tip end portion 4 b of the piston 4 and the tapered portion 6 c of the collet member 6, and the grease is accumulated in the recess 13. In addition, when the actuator 1 is operated, the grease accumulated in the recess 13 comes out of the recess 13 along with the reciprocating motion of the piston 4 and is applied to the inner surface of the tip 4b of the piston 4 and the collet member 6c. become.

  Thus, according to the grease supply mechanism of the actuator according to the present embodiment, the wall portion 2a of the housing member 2 is provided with the grease supply holes 8 communicating from the outer surface of the wall portion 2a to the inner surface, and the housing member The inner surface 2c of the second wall portion 2a is provided with an inner peripheral groove 9 extending in the circumferential direction at a position corresponding to the greasing hole 8, and the bush 3 is penetrated from the outer surface to the inner surface of the bush 3. A plurality of holes 10 are provided at intervals along the inner circumferential groove 9, and an outer circumferential groove 11 extending in the circumferential direction is formed on the outer surface of the piston 4 at a position corresponding to the through hole 10 of the bush 3. In this embodiment, a plurality of communication holes 12 communicating from the outer surface to the inner surface of the piston 4 are provided at intervals along the outer circumferential groove 11. It can supply grease between the Tsu bets member 6. Thereby, the effort of the maintenance inspection of the grease apply | coated to the piston 4 and the collet member 6 can be reduced compared with the past.

  Moreover, according to the grease supply mechanism of the actuator 1 according to the present embodiment, the concave portion 13 is provided on the inner surface of the piston 4 at a position in contact with the tapered portion 6c of the collet member 6, and the concave portion 13 extends in the circumferential direction. Thus, the grease supplied from the greasing hole 8 can be accumulated over the entire circumferential direction of the inner surface of the piston 4. When the actuator 1 is operated, the grease stored in the recess 13 exits from the recess 13 as the piston 4 reciprocates, and is applied between the piston 4 and the collet member 6. Thereby, since the period until grease disappears becomes long, the frequency | count of supplying grease from the greasing hole 8 can be decreased. As a result, it is possible to reduce labor for maintenance and inspection of the grease applied to the piston 4 and the collet member 6.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

In the above-mentioned embodiment, although it has set as the structure which provided both the greasing hole 8 and the recessed part 13, it is good also as a structure which provided only the recessed part 13 without providing the greasing hole 8 grade | etc.,.
In this case, when assembling the actuator, grease is accumulated in the recess 13 on the inner surface of the piston 4. As a result, the period until the grease disappears is longer than in the prior art, so that the number of maintenance inspections by releasing each member of the actuator 1 can be reduced. As a result, it is possible to reduce labor for maintenance and inspection of the grease applied to the piston 4 and the collet member 6.

Moreover, it is good also as a structure which provided only the greasing hole 8 grade | etc., Without providing the recessed part 13. FIG.
In this case, when grease is inserted from the greasing hole 8, the grease flows between the piston 4 and the collet member 6 via the inner circumferential groove 9, the through hole 10, the outer circumferential groove 11, and the communication hole 12. . In this way, grease can be supplied between the piston 4 and the collet member 6 without separating each member of the actuator 1.

In the above-described embodiment, the housing member 2 and the bush 3 are configured separately, but the housing member 2 and the bush 3 may be integrally formed.
In this case, the wall portion 2a of the housing member 2 is provided with a greasing hole 8 so as to communicate from the outer surface to a position corresponding to the piston 4 on the inner surface. Thereby, the grease supplied to the greasing hole 8 flows all at once toward the outer surface of the piston 4, and then between the piston 4 and the collet member 6 via the outer peripheral groove 11 and the communication hole 12 of the piston 4. Will flow.

  In the above-described embodiment, the concave portion 13 is provided on the inner surface of the piston 4 at a position in contact with the tapered portion 6c of the collet member 6. However, the concave portion 13 is not the inner surface of the piston 4, but the collet member. You may provide in the 6 taper part 6c.

  In the above-described embodiment, the concave portion 13 on the inner surface of the piston 4 is formed so as to extend in the circumferential direction. However, the concave portion 13 is not formed so as to extend in the circumferential direction. You may make it provide.

It is sectional drawing of the grease supply mechanism of the actuator which concerns on embodiment of this invention. It is the sectional view on the AA line in FIG. It is sectional drawing of the conventional actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Actuator 2 Housing member 2a Housing member wall part 2b Housing member cylinder part 2c Wall inner surface 3 Bushing 4 Piston 4a Piston cylindrical part 4b Piston tip 5 Bar member 5a Screw groove 6 Collet member 6a Collet member Slit 6b Collet member end 6c Collet member taper 6d Collet member thread 7 Positioning member 8 Greasing hole 9 Inner circumferential groove 10 Through hole 11 Outer circumferential groove 12 Communication hole 13 Recess

Claims (4)

A housing member formed in a tubular shape;
A receiving member disposed inside the housing member and formed into a tubular shape;
Are arranged so as to define an air chamber within the interior space of said receiving member, a piston of reciprocally configured hollow in the longitudinal direction of the housing member,
A rod member that is disposed within the internal space of the piston, has a thread groove formed on an outer surface thereof, and is configured to reciprocate in the longitudinal direction of the housing member together with the piston;
It is arranged so as to be interposed between the piston and the rod member, and is configured such that when the air flows into the air chamber, the inner surface engages with the rod member when the piston contacts the outer surface. An actuator lubrication mechanism comprising: a collet member formed by:
The wall portion of the housing member is provided with a greasing hole that communicates from the outer surface of the wall portion to a position corresponding to the receiving member on the inner surface, and the outer surface of the piston corresponds to the greasing hole. A first circumferential groove extending in the circumferential direction is formed at a position where the piston is formed, and the piston is provided with a plurality of communication holes that communicate from the outer surface to the inner surface of the piston at intervals along the first circumferential groove. A second circumferential groove extending in the circumferential direction at a position corresponding to the grease supply hole is formed on an inner surface of the wall portion of the housing member, and the receiving member is formed from an outer surface of the receiving member. A grease supply mechanism for an actuator, wherein a plurality of through holes communicating with the inner surface are provided at intervals along the second circumferential groove . 2. The grease supply mechanism for an actuator according to claim 1 , wherein a concave portion is provided on an inner surface of the piston at a position in contact with the collet member . The grease supply mechanism for an actuator according to claim 1, wherein a concave portion is provided on an outer surface of the collet member at a position where the collet member comes into contact with the piston . The grease supply mechanism for an actuator according to claim 2, wherein the recess is formed to extend in the circumferential direction.

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