WO2014065183A1 - シーブ - Google Patents
シーブ Download PDFInfo
- Publication number
- WO2014065183A1 WO2014065183A1 PCT/JP2013/078158 JP2013078158W WO2014065183A1 WO 2014065183 A1 WO2014065183 A1 WO 2014065183A1 JP 2013078158 W JP2013078158 W JP 2013078158W WO 2014065183 A1 WO2014065183 A1 WO 2014065183A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sheave
- rope
- rope groove
- groove
- sheave body
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
- F16H55/50—Features essential to rope pulleys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
- F16H55/48—Pulleys manufactured exclusively or in part of non-metallic material, e.g. plastics
Definitions
- the present invention relates to a sheave provided in a mechanical apparatus such as a deck crane.
- a mechanical apparatus such as a deck crane.
- Patent Document 1 a deck crane that lifts and lowers a suspended load by hooking and unloading a hook provided on a rope and lifting and unloading the rope has been widely adopted. Yes.
- various crane apparatuses such as such a deck crane, a large number of sheaves for guiding the feeding and unloading of the rope are provided. Since a large load acts on the sheave, a metal sheave is widely adopted to withstand such a high load.
- Patent Documents 2 and 3 disclose sheaves in which the sheave body is made of resin. Since such a resin sheave is softer than a metal sheave, the contact area with the rope is increased in the rope groove around which the rope is wound. For this reason, damage to the rope is reduced, and it becomes possible to extend the life of the rope. Also, Patent Documents 4 to 7 listed below disclose sheaves (or pulleys) capable of winding a rope.
- ⁇ Resin sheaves can increase the life of ropes compared to metal sheaves, while the manufacturing cost may be high.
- the resin sheave is easily damaged by the rope in its rope groove, it is easy to give the operator the impression that the sheave has deteriorated. For this reason, even though the service life has not been reached, replacement of the sheave is required, and as a result, the service life of the sheave may be shortened.
- An object of the present invention is to provide a sheave that can suppress an increase in cost and a decrease in work efficiency while extending the life of a rope.
- the sheave according to the first aspect of the present invention is provided with a metal sheave main body having a rope groove around which the rope can be wound, and a detachable inside the rope groove. And a resin-made groove protecting portion extending along the rope groove.
- the groove protection portion is composed of a plurality of protection members divided in the circumferential direction of the sheave body.
- the length of the protective member in the circumferential direction is set to be shorter than the length of the rope groove that is not in contact with the rope held by the sheave.
- the protective member is configured to be attached to and detached from the sheave body by moving in the radial direction.
- the rope groove includes a bottom surface portion located radially inward of the outer peripheral edge of the sheave body, and the bottom surface portion to the sheave body. A pair of side surfaces extending to the outer peripheral edge.
- the protection member has a bottom portion that contacts the bottom surface portion of the rope groove, and a pair of side portions that respectively contact the pair of side surface portions of the rope groove.
- the thickness of the bottom is set to be greater than the thickness of the side.
- the side surface portion is provided with a first attachment portion, and the side portion is provided with a second attachment portion. Moreover, it is comprised so that a protection member may be attached to a rope groove by fixing a 2nd attachment part to a 1st attachment part.
- the first attachment portion has a recess formed at the edge of the side surface portion and opening radially outward.
- the second attachment portion has a protruding piece protruding from the outer surface of the side portion. Further, the protruding piece is fixed in the recess.
- the fixing hole is provided at the bottom of the recess, and the insertion hole is provided through the protruding piece. Further, the protruding piece is configured to be fixed in the recess by the fixing hole and the fixing member inserted into the insertion hole.
- the first attachment portion has a fixing hole provided in the side surface portion.
- the second attachment portion has an insertion hole provided through the side portion. Further, the second mounting portion is configured to be fixed to the first mounting portion by the fixing member inserted into the fixing hole and the insertion hole.
- the fixing member has a male screw portion, and the fixing hole has a female screw portion.
- the male screw portion of the fixing member is configured to be screwed into the female screw portion of the fixing hole.
- the first attachment portion and the second attachment portion are wound around a rope groove in a state of being in contact with the bottom portion of the protection member. It is located radially outward of the sheave body rather than the existing rope.
- the distance between the pair of side surface portions increases from the bottom surface portion toward the outer peripheral edge of the sheave body. It is configured.
- an increase in cost and a decrease in work efficiency can be suppressed while extending the life of the rope.
- FIG. 1B is a sectional view taken along line 1B-1B in FIG. 1A.
- FIG. It is the elements on larger scale of FIG. 1B.
- It is a top view of the protection member in a 1st embodiment of the present invention.
- It is a figure explaining the protection member of the state attached to the rope groove of the sheave.
- FIG. 5 is a sectional view taken along line 5-5 of FIG.
- FIG. 7 is a cross-sectional view taken along line 7-7 in FIG.
- FIGS. 1A and 1B are diagrams illustrating a sheave according to the present embodiment.
- 1A is a plan view of the sheave
- FIG. 1B is a cross-sectional view taken along line 1B-1B of FIG. 1A.
- a sheave 100 according to this embodiment includes a metal sheave body 1 having a circular planar shape.
- the sheave body 1 includes a boss portion 3 in which a shaft hole 2 penetrating in the thickness direction (axial direction) is formed in the center portion, an outer peripheral portion 4 positioned in the vicinity of the outer peripheral edge of the sheave body 1, and a sheave body.
- a plurality of spoke portions 5 extending in the radial direction of 1 and connecting the boss portion 3 and the outer peripheral portion 4 are integrally formed by casting.
- the manufacturing method of the sheave body 1 is not limited to casting, and cutting or the like may be used.
- the boss 3 is formed in a cylindrical shape, and an annular recess 6 is formed on one end surface 3a in the thickness direction of the sheave body 1, and the annular recess 6 is formed on the other end surface 3b in the thickness direction of the sheave body 1.
- An annular protrusion 7 that can be fitted is formed.
- the number of sheave bodies 1 attached to the mechanical device is determined according to the number of ropes wound, the rated load, and the like. For this reason, only one sheave body 1 may be used, or a plurality of sheave bodies 1 may be used as described above.
- the outer peripheral part 4 is a part occupying a range of about 1/5 of the radius of the sheave body 1 from the outer peripheral edge of the sheave body 1 toward the boss part 3 side, that is, the center side of the sheave body 1.
- the outer peripheral portion 4 has an outer peripheral edge that is about the same thickness as the boss portion 3, and is configured such that the thickness gradually decreases toward the center of the sheave body 1.
- the spoke part 5 is a part that extends in the radial direction of the sheave body 1 and connects the boss part 3 and the outer peripheral part 4 to each other as described above.
- a plurality of spoke portions 5 are provided at equal intervals in the circumferential direction of the sheave body 1.
- the spoke portion 5 gradually decreases in thickness (thickness in the axial direction) from the boss portion 3 toward the outer peripheral portion 4, and a portion connected to the boss portion 3 is as thick as the boss portion 3.
- the portion connected to the outer peripheral portion 4 has the same thickness as the outer peripheral portion 4.
- a thin portion 8 thinner than the spoke portion 5 is formed between the adjacent spoke portions 5.
- the thin portion 8 contributes to the weight reduction of the sheave body 1 by making it thinner than other portions.
- the thin portion 8 is formed in a substantially fan shape whose width in the circumferential direction gradually increases from the boss portion 3 side toward the outer peripheral portion 4 side.
- the thickness of the thin part 8 is a fixed dimension thinner than the thickness of the spoke part 5.
- a thinning hole 9 that penetrates in the thickness direction of the sheave body 1 is formed in the thin portion 8.
- An annular rope groove 20 around which a rope can be wound is formed on the outer peripheral surface (outer peripheral portion 4) of the sheave body 1, and a plurality of protective members 30 are attached to the rope groove 20. That is, the rope groove 20 is formed along the circumferential direction of the sheave body 1. Below, the structure of the rope groove 20 of the sheave main body 1 and the protection member 30 is demonstrated.
- FIG. 2A is a partially enlarged view of FIG. 1B
- FIG. 2B is a plan view of the protection member 30.
- FIG. 2A a rope groove 20 that is recessed radially inward from the outer peripheral edge of the sheave body 1 is formed on the outer peripheral surface of the sheave body 1.
- the rope groove 20 includes a bottom surface portion 20 a provided at the innermost radial position of the sheave body 1 and a pair of side surface portions 20 b extending from the bottom surface portion 20 a to the outer peripheral edge of the sheave body 1.
- the distance (separation distance) between the pair of side surface portions 20b in the thickness direction of the sheave body 1 gradually increases from the bottom surface portion 20a toward the outer peripheral edge of the sheave body 1.
- the pair of opposing side surface portions 20b are inclined so that the separation distance on the bottom surface portion 20a side is the smallest and the separation distance on the outer peripheral edge side of the sheave body 1 that is the opening side of the rope groove 20 is the largest. Yes.
- a fixed hole 21 (first mounting portion) is formed in each of the pair of side surface portions 20b constituting the rope groove 20.
- a plurality (12 in this embodiment) of the fixing holes 21 are formed in the circumferential direction of the rope groove 20 (the circumferential direction of the sheave body 1). As shown in FIG. 2A, the fixing hole 21 is provided through the side surface portion 20b. Further, an inner peripheral surface of the fixing hole 21 is formed so that a screw member 25 (including a flat head countersunk screw and a male screw portion) as a fixing member for attaching a protection member 30 to be described later to the rope groove 20 can be screwed.
- a screw groove female screw portion
- the male screw portion of the screw member 25 is configured to be screwed into the female screw portion of the fixing hole 21.
- the protective member 30 is a resin member extending along the rope groove 20. As shown in FIG. 2B, the protection member 30 has a length of about 1/6 with respect to the circumferential length of the annular rope groove 20 (the length of the entire circumference). That is, in the sheave 100 of the present embodiment, a plurality (six) of the protection members 30 divided in the circumferential direction of the rope groove 20 (the circumferential direction of the sheave body 1) are provided. Since the plurality of protection members 30 cover the entire inner surface of the rope groove 20, the plurality of protection members 30 extend along the rope groove 20 and protect the rope groove 20. G is configured. That is, the sheave 100 according to the present embodiment includes the sheave body 1 and the groove protection portion G including the plurality of protection members 30.
- the protective member 30 has a cross-sectional shape that fits into the rope groove 20 as shown in FIG. 2A.
- the protection member 30 is configured to be able to adhere to the inner surface of the rope groove 20.
- the protection member 30 has a bottom portion 30 a that faces the bottom surface portion 20 a of the rope groove 20, and a pair of side portions 30 b that face the pair of side surface portions 20 b of the rope groove 20.
- the protection member 30 maintains a dimensional relationship in which the outer surface of the bottom portion 30a is in contact with the bottom surface portion 20a and the outer surface of the side portion 30b is in contact with the side surface portion 20b.
- the separation distance on the bottom 30 a side of the pair of side portions 30 b in the protection member 30 is the smallest. That is, the distance between the pair of side portions 30b in the thickness direction of the sheave body 1 gradually increases from the bottom portion 30a toward the outer peripheral edge of the sheave body 1.
- the pair of side portions 30b in the protection member 30 penetrates from the inside to the outside of the side portions 30b, that is, in the thickness direction, and the insertion holes 31 (the first holes) through which the above-described screw members 25 (fixing members) are inserted. 2 attachment portions) are formed.
- the insertion hole 31 is formed in a conical shape as shown in FIG. 2A, and is arranged at a position facing the fixing hole 21 of the rope groove 20 when the protection member 30 is fitted into the rope groove 20. .
- the protective member 30 is fitted into the rope groove 20, and the screw member 25 is inserted into the insertion hole 31 with the insertion hole 31 facing the fixing hole 21, and the screw member 25 is screwed into the fixing hole 21.
- the protection member 30 is attached to the rope groove 20 by the fastening force generated by screwing the screw member 25 into the fixing hole 21. Therefore, when replacing the protection member 30, it is possible to easily replace the protection member 30 by removing the screw member 25. That is, the protection member 30 of this embodiment is detachably provided in the rope groove 20 of the sheave body 1. Further, the protection member 30 is configured to be attached to and detached from the sheave body 1 by moving in the radial direction with the screw member 25 removed, and a part of the sheave body 1 is removed or deformed. Work is not required.
- the screw member 25 In the state where the protection member 30 is attached to the rope groove 20 by the screw member 25, the screw member 25 is completely buried in the insertion hole 31, or the flat head of the screw member 25 and the inner surface of the side portion 30b face each other. It is desirable to be configured to be unity. In this case, it is possible to prevent the rope wound around the rope groove 20 from coming into contact with the screw member 25 and being damaged, or the screw member 25 from being loosened by friction with the rope and weakening its fastening force.
- the screw member 25 is prevented from being damaged by the rope or its fastening force being weakened by arranging the first and second mounting portions at positions where the normally wound rope does not contact. it can. Further, the rope can be prevented from being damaged by the screw member 25.
- the rope may be shifted by about 5 degrees in the width direction of the sheave body 1 and run on the side 30b when the rope is inserted or drawn out. It is more desirable to provide the first and second mounting portions in Furthermore, in this embodiment, although the fixing hole 21 penetrated in the thickness direction of the side part 20b, the fixing hole 21 may be non-penetrating. It is also possible to configure the fixing hole 21 as a through hole in which no thread groove is formed, and use a bolt and a nut as the fixing member.
- FIG. 3 is a diagram illustrating the protective member 30 attached to the rope groove 20.
- a plurality of (six in this embodiment) protection members 30 are continuously attached along the circumferential direction of the rope groove 20 (not shown in FIG. 3), so that the rope groove 20 The entire periphery is covered with the protective member 30.
- the rope wound around the sheave always comes into contact with the protective member 30 made of resin.
- the protective member 30 is compressed and deformed by the load of the rope or the suspended load, the contact area between the rope and the protective member 30 increases. Therefore, compared to the case where the rope is wound directly around the metal rope groove 20, the rope Is difficult to damage, and the life of the rope can be extended.
- the protective member 30 is provided only in the rope groove 20 as in the present embodiment, it is possible to manufacture at a lower cost compared to the case where the entire sheave is manufactured from a resin, thereby suppressing an increase in cost. Can do.
- the protection member 30 is detachably provided to the rope groove 20. Therefore, when the protective member 30 is damaged, it is only necessary to replace the protective member 30, and the running cost can be reduced as compared with the case where the entire sheave is replaced.
- the protection member 30 is divided into a plurality in the circumferential direction of the rope groove 20, the replacement work of the protection member 30 can be simplified. Specifically, using FIG. 3, the rope R wound around the sheave contacts the entire circumference of the rope groove 20 (groove protection portion G) in a range of about half at the maximum.
- the length of each protective member 30 in the circumferential direction of the sheave body 1 is the length of the rope groove 20 not in contact with the rope R held by the sheave 100 (a pair extending in the vertical direction in FIG. 3). Length in the circumferential direction of the rope groove 20 positioned between the ropes R).
- the rope R when replacing a part of the protection members 30 for one sheave, the rope R can be obtained by rotating the sheave to a position where the protection member 30 to be exchanged is not in contact with the rope R.
- the protection member 30 can be exchanged without removing it from the sheave. Since the protection member 30 of the present embodiment is configured to be attached and detached only by moving the sheave body 1 in the radial direction with the screw member 25 removed, the rope is wound around the sheave. The replacement work in the state can be easily performed.
- the next The protection member 30 can be easily replaced by the same method.
- the plurality of protective members 30 divided in the circumferential direction it is possible to remarkably improve the maintainability and the work efficiency.
- the material of the protection member 30 of this embodiment should just be comprised with resin, and the specific material is not specifically limited.
- the material of the protective member 30 include a fluorine resin such as phenol resin, polyacetal resin (POM), polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK) resin, polyamide (PA) resin, polyimide (PI).
- a fluorine resin such as phenol resin, polyacetal resin (POM), polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK) resin, polyamide (PA) resin, polyimide (PI).
- FIG. 4 is a plan view showing a part of the sheave in the second embodiment of the present invention.
- 5 is a cross-sectional view taken along line 5-5 of FIG.
- FIG. 6 is a plan view of the protection member.
- 7 is a cross-sectional view taken along line 7-7 of FIG.
- FIG. 8 is a perspective view of the protective member.
- FIG. 9 is a perspective view showing a modification of the protective member in the second embodiment of the present invention.
- the sheave 200 according to the present embodiment is provided in a crane device or the like and used in a state in which the rope is wound, like the sheave 100 according to the first embodiment.
- the sheave 200 includes a sheave body 1 and a groove protection portion G that is provided in the rope groove 20 of the sheave body 1 and protects the inner surface of the rope groove 20.
- the groove protection part G is composed of a plurality of protection members 40 divided in the circumferential direction of the sheave body 1. In the present embodiment, eight protective members 40 are attached to the sheave body 1.
- the sheave body 1 As a configuration for attaching the protection member 40 to the rope groove 20, the sheave body 1 has a recess 22 (formed on the edge of the side surface 20 b (the outer edge in the radial direction) and opened toward the outer side in the radial direction. 1st attachment part) is formed.
- the protection member 40 is made of resin, like the protection member 30 of the first embodiment.
- the protective member 40 of this embodiment is manufactured using the injection molding which manufactures a resin product by inject
- the length of the protective member 40 in the circumferential direction of the sheave body 1 is set to be shorter than the length in the circumferential direction of the rope groove 20 that is not in contact with the rope held by the sheave 200.
- the protection member 40 includes a bottom portion 40a that faces and contacts the bottom surface portion 20a of the rope groove 20, and a pair of side portions 40b that respectively face and contact the pair of side surface portions 20b.
- Each of the pair of side portions 40b is provided with a protruding piece 41 (second mounting portion) provided so as to protrude from the outer surface thereof.
- the protruding piece 41 protrudes in the thickness direction (axial direction) of the sheave body 1 from the side portion 40b.
- the protruding piece 41 is formed integrally with the side portion 40b and is provided in the vicinity of the edge portion (the outer edge portion in the radial direction) of the side portion 40b.
- the protrusion piece 41 is provided in the position arrange
- a fixing hole 23 extending in the radial direction of the sheave body 1 is formed at the bottom of the concave portion 22 in the side surface portion 20b.
- An internal thread portion is formed on the inner surface of the fixing hole 23.
- the fixing hole 23 of the present embodiment is provided through the side surface portion 20b, but may be a non-through hole portion.
- the protruding piece 41 is provided with an insertion hole 42 penetrating in the radial direction of the sheave body 1.
- the insertion hole 42 is provided at a position that communicates with the fixing hole 23 when the protruding piece 41 is disposed in the recess 22.
- a bolt 26 fixing member
- the protruding piece 41 is fixed in the recess 22 by inserting the male screw portion of the bolt 26 inserted into the insertion hole 42 of the protruding piece 41 into the fixing hole 23 of the recess 22 and screwing it. That is, the projecting piece 41 is fixed in the concave portion 22 of the side surface portion 20 b using the bolt 26, so that the protective member 40 is attached to the rope groove 20.
- reinforcing plates 43 are respectively connected to both ends of the protruding piece 41 in the circumferential direction of the sheave body 1 (see FIG. 4).
- the reinforcing plate 43 connects the protruding piece 41 and the outer surface of the side portion 40b, and is provided to improve the strength of the protruding piece 41.
- the edge part of the side part 40b is formed so that it may extend continuously in the circumferential direction.
- the protection member 40 has a partition portion 44 that divides a region where the head of the bolt 26 inserted into the insertion hole 42 is disposed and an inner region (region where the rope is disposed) of the protection member 40. Is provided.
- the partition portion 44 can reliably prevent the rope from being damaged by the bolt 26.
- the thickness of the bottom portion 40a is greater than the thickness of the side portion 40b (thickness in the direction perpendicular to the surface of the side portion 40b). It is also set thick.
- the cross-sectional shape of the bottom surface portion 20a of the rope groove 20 in the direction orthogonal to the circumferential direction is formed in an arc shape that is concave toward the radially outer side (see FIG. 5).
- the cross-sectional shape in the direction orthogonal to the circumferential direction of the inner surface of the bottom part 40a in the protection member 40 is also formed in the circular arc shape which becomes concave toward the radial direction outer side.
- the protection member 40 is attached in contact with the inner surface of the rope groove 20, so that the curvature of the inner surface of the bottom portion 40a is the same as that of the bottom surface portion 20a. It becomes smaller than the curvature.
- the thickness of the bottom portion 40a is larger than the thickness of the side portion 40b so that the curvature of the inner surface of the bottom portion 40a is equal to (or close to) the curvature of the bottom surface portion 20a. It is configured to be thick.
- the protection member 40 in the present embodiment is molded using injection molding, the molding of the bottom portion 40a thicker than the side portion 40b may not be appropriately performed in this injection molding.
- the molten resin injected into the mold is filled into each part of the mold by maintaining a constant injection pressure.
- a large space is formed in the part that forms the bottom 40a thicker than the other parts. Therefore, defects (such as generation of bubbles, depression, unfilled molten resin, etc.) may occur. Therefore, a large number of holes 45 are formed on the outer surface of the bottom 40a of the protection member 40. Since a large number of holes 45 are formed in the bottom 40a, the space in the portion corresponding to the bottom 40a of the mold in the injection molding is reduced, and it becomes possible to prevent defects during injection.
- the hole 45 is formed in the bottom part 40a
- the position of the outer surface, ie, the surface which touches the bottom face part 20a of the rope groove 20, is the same as the case where the hole part 45 is not formed, and the thickness of the bottom part 40a.
- a configuration in which the thickness is thicker than the side portion 40b can be secured.
- FIG. 9 is a perspective view showing a modification of the protective member in the second embodiment of the present invention.
- the protection member 40 in this modification is not provided with the reinforcing plate 43. If the strength of the protruding piece 41 can be secured without providing the reinforcing plate 43, the reinforcing plate 43 can be omitted.
- a plurality of groove portions 46 are formed on the outer surface of the bottom portion 40 a instead of the plurality of hole portions 45. The groove 46 extends in the circumferential direction.
- the groove portion 46 By forming the groove portion 46, the space of the portion corresponding to the bottom portion 40a of the mold in the injection molding can be reduced, and defects at the time of injection can be prevented.
- the area of the outer surface (surface contacting the rope groove 20) in the bottom 40a the area when the hole 45 is formed is larger than the area when the groove 46 is formed. For this reason, in order to ensure the high intensity
- the distance between the pair of side surface portions 20b increases from the bottom surface portion 20a toward the outer peripheral edge of the sheave body 1.
- the present invention is not limited to this configuration, and it is possible to provide the pair of side surface portions 20b in parallel to each other as long as a clearance is provided in which the rope is disposed between the pair of side surface portions 20b.
- the pair of side portions 30b (40b) are also provided in parallel to each other.
- the bolt 26 is used to attach the protection member 40 to the rope groove 20.
- a bolt and a nut may be used as a fixing member.
- the female screw portion formed on the inner surface of the fixing hole 23 in the concave portion 22 can be omitted.
- a screw member or a bolt is used to attach the protection member to the rope groove.
- an engaging claw is provided on the outer surface of the side portion 30b or the lower surface of the protruding piece 41.
- a configuration may be adopted.
- an engagement portion capable of engaging with the engagement claw is provided on the inner surface of the side surface portion 20 b and the bottom portion of the recess 22. That is, since the attachment of the holding member to the rope groove is completed by engaging the engaging claw with the engaging portion, a fixing member such as a screw member can be omitted.
- sheave according to the above embodiment is not limited to a deck crane, and can be widely applied to various crane devices and further to other mechanical devices, and uses and applicable mechanical devices are not particularly limited.
- the present invention can be used for a sheave provided in a mechanical device such as a crane.
Abstract
Description
本願は、2012年10月22日に日本に出願された特願2012-233150号に基づき優先権を主張し、その内容をここに援用する。
また、下記特許文献4~7にも、ロープを巻き回し可能なシーブ(又はプーリ)が開示されている。
図1A,1Bは、本実施形態のシーブを説明する図である。図1Aはシーブの平面図であり、図1Bは図1Aの1B-1B線断面図である。
図1A,1Bに示すように、本実施形態のシーブ100は、平面形状が円形の金属製のシーブ本体1を備えている。このシーブ本体1は、その中心部において厚さ方向(軸方向)に貫通する軸孔2が形成されたボス部3と、シーブ本体1の外周縁の近傍に位置する外周部4と、シーブ本体1の径方向に延びてボス部3と外周部4とを連結する複数のスポーク部5と、が鋳造により一体成形されている。なお、シーブ本体1の製造方法は鋳造に限定されず、切削加工等を用いてもよい。
本発明の第2実施形態を、図面を参照して以下に説明する。
図4は、本発明の第2実施形態におけるシーブの一部を示す平面図である。図5は、図4の5-5線断面図である。図6は、保護部材の平面図である。図7は、図6の7-7線断面図である。図8は、保護部材の斜視図である。図9は、本発明の第2実施形態における保護部材の変形例を示す斜視図である。
保護部材40の、シーブ本体1の周方向での長さは、シーブ200に保持されたロープと接触していないロープ溝20の周方向での長さよりも短く設定されている。
一対の側部40bには、その外面から突出して設けられる突出片41(第2取付部)が各々設けられている。突出片41は、側部40bからシーブ本体1の厚さ方向(軸方向)に突出している。突出片41は、側部40bと一体的に成形され、側部40bの縁部(径方向外側の縁部)近傍に設けられている。また、突出片41は、保護部材40のロープ溝20内への取付け時において、側面部20bにおける凹部22内へ配置される位置に設けられている。
突出片41には、シーブ本体1の径方向で貫通する挿通孔42が設けられている。挿通孔42は、突出片41が凹部22内に配置されたときに、固定孔23と連通する位置に設けられている。
突出片41を凹部22内に固定するために、ボルト26(固定部材)が使用される。突出片41の挿通孔42に挿入されたボルト26の雄ネジ部を、凹部22の固定孔23に挿入し螺合することで、突出片41が凹部22内に固定される。すなわち、ボルト26を用いて突出片41が側面部20bの凹部22内に固定されることで、保護部材40がロープ溝20に取り付けられるように構成されている。
側部40bの縁部は、周方向に連続して延びるように形成されている。換言すれば、保護部材40には、挿通孔42に挿入されたボルト26の頭部が配置される領域と、保護部材40の内側領域(ロープが配置される領域)とを区画する仕切り部44が設けられている。仕切り部44により、ロープがボルト26によって損傷することを確実に防止できる。
ロープ溝20における底面部20aの、周方向に直交する方向での断面形状は、径方向外側に向かって凹となる円弧状に形成されている(図5参照)。また、保護部材40における底部40aの内面の、周方向に直交する方向での断面形状も、径方向外側に向かって凹となる円弧状に形成されている。ここで、底部40aと側部40bとの各厚さを同一に設定すると、保護部材40はロープ溝20の内面に接して取り付けられるために、底部40aの内面での曲率が、底面部20aの曲率よりも小さくなる。
本実施形態での保護部材40は、底部40aの内面での曲率が底面部20aでの曲率と等しい値(又は近い値)となるように、底部40aの厚さが側部40bの厚さよりも厚くなるように構成されている。このため、保護部材40をロープ溝20に取り付けたシーブ200、及び保護部材40を全て取り外したシーブ本体1のいずれにおいても、同じ太さのロープを使用することが可能となる。クレーン装置等の使用態様に応じて、保護部材40を取り付けた状態、及び取り外した状態を任意に選択することができる。また、保護部材40が損傷又は交換時期に達したが、新たな保護部材40の入手が難しい場合に、シーブ本体1のロープ溝20へ直接にロープを巻き回してクレーン装置を使用することも可能である。
そこで、保護部材40における底部40aの外面には、多数の孔部45が形成されている。多数の孔部45が底部40aに形成されているため、射出成形における金型の、底部40aに相当する部分の空間が縮小され、射出時における欠陥を防止することが可能となる。また、底部40aには孔部45が形成されているが、その外面、すなわちロープ溝20の底面部20aに接する表面の位置は、孔部45を形成しない場合と同一であり、底部40aの厚さが側部40bよりも厚いという構成も確保できる。
なお、射出成形用の金型から成形後の保護部材40を容易に取り出すため、多数の孔部45の延びる方向(底部40aの厚さ方向)を全て等しくすることが好ましい。
図9に示すように、本変形例における保護部材40には、補強板43が設けられていない。補強板43を設けることなく突出片41の強度が確保できる場合は、補強板43を省略することも可能である。
また、底部40aの外面には、複数の孔部45に代えて、複数の溝部46が形成されている。溝部46は、周方向に延びて形成されている。溝部46を形成することによっても、射出成形における金型の、底部40aに相当する部分の空間を縮小することができ、射出時における欠陥を防止できる。ただし、底部40aにおける外面(ロープ溝20と接触する面)の面積に関しては、孔部45を形成した場合の面積が、溝部46を形成した場合の面積よりも多くなる。このため、ロープからの圧縮荷重を受ける底部40aの高い強度を確保するためには、底部40aには複数の孔部45を形成することがより好ましい。
また、上記実施形態では保護部材をロープ溝に取り付けるためにネジ部材やボルトが使用されているが、この構成に代えて、側部30bの外面や突出片41の下面に、係合爪を設ける構成を採用してもよい。この場合、側面部20bの内面や凹部22の底部に、上記係合爪を係合可能な係合部が設けられる。すなわち、係合部に係合爪を係合させることで保持部材のロープ溝への取付けが完了するため、ネジ部材等の固定部材を省略できる。
4 外周部
20 ロープ溝
20a 底面部
20b 側面部
21,23 固定孔(第1取付部)
22 凹部
25 ネジ部材(固定部材)
26 ボルト(固定部材)
30,40 保護部材
30a,40a 底部
30b,40b 側部
31 挿通孔(第2取付部)
41 突出片(第2取付部)
100,200 シーブ
G 溝保護部
Claims (13)
- ロープを巻き回し可能なロープ溝が外周部に形成された金属製のシーブ本体と、
前記ロープ溝内に着脱可能に設けられ、前記ロープ溝に沿って延びる樹脂製の溝保護部と、
を備えるシーブ。 - 前記溝保護部は、前記シーブ本体の周方向に分割された複数の保護部材から構成されている請求項1に記載のシーブ。
- 前記保護部材の前記周方向での長さは、前記シーブに保持された前記ロープと接触していない前記ロープ溝の長さよりも短く設定されている請求項2に記載のシーブ。
- 前記保護部材は、前記シーブ本体に対してその径方向に移動させて着脱されるように構成されている請求項2又は3に記載のシーブ。
- 前記ロープ溝は、
前記シーブ本体の外周縁よりも径方向内側に位置する底面部と、
前記底面部から前記シーブ本体の外周縁まで延びる一対の側面部と、
を有し、
前記保護部材は、
前記ロープ溝の底面部に接触する底部と、
前記ロープ溝の一対の側面部に各々接触する一対の側部と、
を有する請求項2から4のいずれか一項に記載のシーブ。 - 前記底部の厚さは、前記側部の厚さよりも厚く設定されている請求項5に記載のシーブ。
- 前記側面部には、第1取付部が設けられ、
前記側部には、第2取付部が設けられ、
前記第2取付部が前記第1取付部に固定されることで、前記保護部材が前記ロープ溝に取り付けられるように構成されている請求項5又は6に記載のシーブ。 - 前記第1取付部は、前記側面部の縁部に形成されると共に径方向外側に向けて開口する凹部を有し、
前記第2取付部は、前記側部の外面から突出する突出片を有し、
前記凹部内に前記突出片が固定されるように構成されている請求項7に記載のシーブ。 - 固定孔が、前記凹部の底部に設けられ、
挿通孔が、前記突出片を貫通して設けられ、
前記固定孔及び前記挿通孔に挿入された固定部材によって、前記突出片が前記凹部内に固定されるように構成されている請求項8に記載のシーブ。 - 前記第1取付部は、前記側面部に設けられる固定孔を有し、
前記第2取付部は、前記側部を貫通して設けられる挿通孔を有し、
前記固定孔及び前記挿通孔に挿入された固定部材によって、前記第2取付部が前記第1取付部に固定されるように構成されている請求項7に記載のシーブ。 - 前記固定部材は、雄ネジ部を有し、
前記固定孔は、雌ネジ部を有し、
前記固定部材の雄ネジ部が、前記固定孔の雌ネジ部に螺合されるように構成されている請求項9又は10に記載のシーブ。 - 前記第1取付部及び前記第2取付部は、前記保護部材の底部に接触した状態で前記ロープ溝に巻き回されているロープよりも、前記シーブ本体の径方向外方に位置している請求項7から11のいずれか一項に記載のシーブ。
- 前記一対の側面部の間の距離は、前記底面部から前記シーブ本体の外周縁に向かうに従い増加するように構成されている請求項5から12のいずれか一項に記載のシーブ。
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JP2016216164A (ja) * | 2015-05-18 | 2016-12-22 | 株式会社Ihi | シーブ及び該シーブを備えたデッキクレーン |
JP2017071466A (ja) * | 2015-10-06 | 2017-04-13 | 株式会社Ihi | 滑車及び該滑車を備えたデッキクレーン |
EP3613696A1 (en) * | 2018-08-20 | 2020-02-26 | Otis Elevator Company | Sheaver liner including wear indicators |
WO2020255285A1 (ja) * | 2019-06-19 | 2020-12-24 | 株式会社日立製作所 | 巻上機、それを用いたエレベーター装置、および、プーリ装置 |
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CN113404845A (zh) * | 2021-07-05 | 2021-09-17 | 连云港亚新钢铁有限公司 | 一种高炉料车绳轮 |
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GB2020775A (en) * | 1978-05-15 | 1979-11-21 | Sandalbrook Ltd | Improved retaining ring |
JPS56121071U (ja) * | 1980-02-12 | 1981-09-16 | ||
FR2602296B1 (fr) * | 1986-08-01 | 1990-08-31 | Ivano Frankovsk I Nefti Gaza | Poulie |
CN201377564Y (zh) * | 2009-03-10 | 2010-01-06 | 梁正 | 可保护钢丝绳滑轮 |
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GB204811A (en) * | 1922-07-21 | 1923-10-11 | Ropeways Ltd | Improvements in or relating to sheaves, wheels and the like |
JPS4736754Y1 (ja) * | 1967-11-02 | 1972-11-07 | ||
JPS55142747U (ja) * | 1979-03-31 | 1980-10-13 | ||
JPS59153793A (ja) * | 1983-02-14 | 1984-09-01 | 株式会社東芝 | エレベ−タのトラクシヨンシ−ブ |
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JP2016216164A (ja) * | 2015-05-18 | 2016-12-22 | 株式会社Ihi | シーブ及び該シーブを備えたデッキクレーン |
JP2017071466A (ja) * | 2015-10-06 | 2017-04-13 | 株式会社Ihi | 滑車及び該滑車を備えたデッキクレーン |
EP3613696A1 (en) * | 2018-08-20 | 2020-02-26 | Otis Elevator Company | Sheaver liner including wear indicators |
US11492230B2 (en) | 2018-08-20 | 2022-11-08 | Otis Elevator Company | Sheave liner including wear indicators |
WO2020255285A1 (ja) * | 2019-06-19 | 2020-12-24 | 株式会社日立製作所 | 巻上機、それを用いたエレベーター装置、および、プーリ装置 |
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