JP6017653B1 - Pulley device and forklift - Google Patents

Abstract

A pulley apparatus capable of reducing wear on a piping tube and a forklift provided with the pulley apparatus are provided. The pulley device is rotatable around an axis O, and has a sliding contact surface 31S that extends in the circumferential direction of the axis O and on which a pipe tube is wound from the outer peripheral side, and a space 36 is formed therein. The pulley body 31 is provided with an exposure hole 35 that communicates the space 36 with the radially outer side of the sliding contact surface 31S, and is provided in the space 36 to close the exposure hole 35 from the radially inner side of the axis O. A possible lid 32, a lubricating oil supply part that supplies lubricating oil to the lid 32, and an elastic member 34 that is provided on the pulley body 31 and biases the lid 32 from the radially inner side of the axis O to the outside. . [Selection] Figure 5

Description

  The present invention relates to a pulley apparatus and a forklift.

  For example, forklifts have been generally used for carrying in and out of luggage, picking, etc. in a warehouse. Specifically, a forklift described in Patent Document 1 below is known. This forklift is a so-called reach type forklift. The reach-type forklift includes a fork on which a load is mounted, a mast that supports the fork so as to be movable in the vertical direction, and a lift cylinder that extends and contracts the mast by hydraulic pressure.

  Furthermore, in some forklifts, in addition to the lift cylinder, another hydraulic cylinder is provided on the mast. More specifically, there is known one provided with a tilt hydraulic cylinder for performing an operation (tilt operation) of swinging the fork in the front-rear direction of the forklift. The tilt hydraulic cylinder is provided integrally with a lift bracket that supports the fork. That is, the tilt hydraulic cylinder moves up and down as the fork moves up and down.

JP 2014-114102 A

  Here, the hydraulic pipe for supplying the hydraulic oil to the hydraulic cylinder provided in the mast as described above is supported in a state of being hung around the pulley. However, if friction is repeated between the pulley and the hydraulic piping with use over time, the surface of the hydraulic piping formed of rubber or the like may be worn. When such wear progresses, there is a possibility that the hydraulic oil leaks from the hydraulic piping and affects the operation of the forklift.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a pulley device that can reduce wear on a piping tube, and a forklift equipped with the pulley device.

  A pulley device according to an aspect of the present invention has a sliding contact surface that is rotatable about an axis and extends in a circumferential direction of the axis so that a piping tube is wound from an outer peripheral side, and a space is formed therein. And a pulley main body formed with an exposed hole that communicates the space and the radially outer side of the sliding contact surface, and provided in the space, and the exposed hole can be closed from the radially inner side of the axis. A lid, a lubricant supply unit that supplies lubricant to the lid, and an elastic member that is provided on the pulley body and biases the lid outward from the radially inner side of the axis.

  According to this configuration, when the piping tube is not in contact, the lid is supported by the elastic member and closes the exposure hole. On the other hand, when the piping tube comes into contact with the protruding portion, the lid body is immersed inside the pulley body in the radial direction, and the lubricating oil oozes out on the sliding contact surface. Thereby, it can lubricate between a piping tube and a sliding contact surface. Furthermore, since the lid closes the exposed hole in a state where it does not come into contact with the piping tube, leakage of excess lubricating oil can be suppressed.

  In the pulley device according to one aspect of the present invention, the lid may have a diameter larger than that of the exposure hole.

  According to this configuration, since the diameter of the lid is larger than the exposed hole, the exposed hole can be sufficiently blocked by the lid.

  In the pulley device according to one aspect of the present invention, the lubricating oil supply unit includes a tank part formed in the space in the pulley body, and a supply hole that opens from the tank part toward the lid. You may prepare.

  According to this configuration, since the lubricating oil can be held in the tank portion, the pulley device can be lubricated without continuously supplying the lubricating oil from the outside.

  In the pulley device according to one aspect of the present invention, a plurality of the exposure holes are formed at intervals in the circumferential direction of the sliding contact surface, and a plurality of the lids are provided corresponding to the plurality of the exposure holes. Also good.

  According to this structure, this can be lubricated over substantially the entire circumferential direction of the sliding contact surface. Furthermore, even if a slip occurs between the piping tube and the sliding contact surface, any one or more lids contact the piping tube, so that the sliding contact surface can be continuously lubricated.

  A forklift according to an aspect of the present invention includes the pulley device according to any one of the above aspects.

  According to this configuration, it is possible to provide a forklift that includes a pulley device that can be stably used continuously.

  ADVANTAGE OF THE INVENTION According to this invention, the pulley apparatus which can reduce the abrasion given to a piping tube, and a forklift provided with this can be provided.

1 is an overall view of a forklift according to an embodiment of the present invention. It is a mimetic diagram showing operation of a forklift concerning an embodiment of the present invention. It is a mimetic diagram showing operation of a forklift concerning an embodiment of the present invention. It is a figure which shows the external appearance of the pulley apparatus which concerns on embodiment of this invention. It is sectional drawing in the circumferential direction of the pulley apparatus which concerns on embodiment of this invention. It is sectional drawing in the circumferential direction of the pulley apparatus which concerns on embodiment of this invention. It is sectional drawing in the axial direction of the pulley apparatus which concerns on embodiment of this invention. It is sectional drawing of the modification of the pulley apparatus which concerns on embodiment of this invention. It is sectional drawing of the modification of the pulley apparatus which concerns on embodiment of this invention.

[First embodiment]
A first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the forklift 100 is a reach-type forklift 100. The forklift 100 includes a vehicle body 1 having a cab 10 on which an operator boardes, and a cargo handling device 2 provided on the vehicle body 1.

  The vehicle body 1 is provided with a plurality of wheels 11 driven by a battery (not shown) and a motor (not shown), and travels by an operator's operation. In the following description, the direction in which the vehicle travels is referred to as the front-rear direction.

  A cargo handling device 2 that is movable in the front-rear direction is provided on the front side of the vehicle. The cargo handling device 2 includes a reach carriage 21 and a mast device 22 provided on the reach carriage 21.

  The reach carriage 21 includes a plurality of wheels 23. The reach carriage 21 can be moved in the front-rear direction along the rails provided on the vehicle body 1 by these wheels 23.

  The mast device 22 includes an outer mast 221, an inner mast 222, a lift bracket 223 supported by the inner mast 222, a fork portion 224 attached to the lift bracket 223, and a lift cylinder 225.

  Further, the lift bracket 223 is provided with a tilt hydraulic cylinder 229 for tilting the fork portion 224. The tilt operation refers to an operation of swinging the fork portion 224 with respect to the lift bracket 223 in the front-rear direction of the vehicle body 1. The tilt hydraulic cylinder 229 extends with a hydraulic pipe 4 for supplying hydraulic oil from a supply source (not shown).

  Hereinafter, the configuration of the mast device 22 will be described in detail with reference to FIG. 2 or FIG. As shown in the figure, the outer mast 221 is erected on the left and right sides so as to extend upward from the reach carriage 21. The inner mast 222 can be moved up and down by being supported and guided by the outer mast 221.

The lift bracket 223 is connected to the outer mast 221 through a chain 226. The chain 226 is supported and guided by a chain wheel 227 provided in a cylinder portion 225A of a lift cylinder 225 described later. That is, the chain 226 extends upward from the lift bracket 223 and then turns downward via the chain wheel 227 and is connected to the lift cylinder 225. The length of the chain 226 is set to a length that allows the lift bracket 223 and the lift cylinder 225 to be connected to each other in a state where the lift bracket 223 and the inner mast 222 are located at the lowest position.
Further, the lift bracket 223 is attached with a fork portion 224 capable of supporting a load by extending in a substantially horizontal direction.

  The lift cylinder 225 is a hydraulic device provided on the reach carriage 21. The lift cylinder 225 has a cylinder portion 225A fixed on the reach carriage 21, and a rod portion 225B that can be moved out of the cylinder portion 225A by hydraulic pressure. The upper end of this is connected to the chain support 228. That is, when the rod part 225B advances upward, the inner mast 222 can also advance upward. In addition, the connection aspect of the rod part 225B and the inner mast 222 is not limited to the above.

  Further, the hydraulic pipe 4 described above is supported in a state of being wound around the pulley device 3 from the outer peripheral side. As will be described in detail later, the pulley device 3 is provided near the upper end of the inner mast 222 as shown in FIG.

The operation of the mast configured as described above will be described with reference to FIGS. 2 and 3 again.
As shown in FIG. 2, in the initial state, the rod portion 225B of the lift cylinder 225 is stored inside the cylinder portion 225A. As a result, the inner mast 222 overlaps with the outer mast 221 and is positioned at the lowest position. At this time, the lift bracket 223 and the fork 224 are also located at the lower end.

  When the rod portion 225B of the lift cylinder 225 is advanced upward from the above state, the state shown in FIG. 3 is obtained. That is, the inner mast 222 moves upward by being pulled by the rod portion 225B of the lift cylinder 225 and the chain support 228. Here, the lift bracket 223 and the outer mast 221 are connected by a chain 226 having a certain length. As a result, the chain 226 is pulled upward as the inner mast 222 rises. As the chain 226 is pulled, the chain wheel 227 at the upper end of the inner mast 222 rotates. That is, the chain wheel 227 functions as a moving pulley. In the present embodiment, the chain wheel 227 is provided coaxially and integrally with the pulley device 3.

  As described above, the lift bracket 223 and the fork portion 224 are raised to a height approximately equal to the sum of the height dimensions of the inner mast 222 and the outer mast 221. Thereby, it becomes possible to handle the cargo etc. in a high place.

  Here, the tilt hydraulic cylinder 229 is provided integrally with a lift bracket 223 that supports the fork portion 224. As a result, the tilt hydraulic cylinder 229 moves up and down as the lift bracket 223 moves up and down.

  Further, as shown in FIG. 1 or FIG. 4, the hydraulic pipe 4 that supplies the hydraulic oil to the tilt hydraulic cylinder 229 is supported in a state of being wound around the pulley device 3. When friction is repeated between the pulley and the hydraulic pipe 4 with use over time, the surface of the hydraulic pipe 4 formed of rubber or the like may be worn. When such wear progresses, there is a possibility that the operation oil of the forklift 100 is affected by leakage of hydraulic oil from the hydraulic pipe 4.

  Therefore, in the present embodiment, the following configuration is adopted as the pulley device 3 for handling the hydraulic piping 4 (piping tube 4) as described above. As shown in FIGS. 5 and 6, the pulley device 3 includes a pulley main body 31, a lid body 32 provided on the pulley main body 31, a lubricating oil supply unit 33, and an elastic member 34. .

  The pulley main body 31 is a substantially columnar member extending along the axis O, and is rotatable around the axis O. Furthermore, the outer peripheral surface of the pulley body 31 is recessed from the radially outer side to the inner side, thereby forming a sliding contact surface 31S. On the sliding contact surface 31S, the piping tube 4 is abutted and supported.

  Furthermore, a plurality of exposure holes 35 arranged at intervals in the circumferential direction are formed on the sliding contact surface 31S (see FIG. 7). The exposure hole 35 is an opening having a substantially circular shape when viewed from the radial direction. A part of a lid 32 to be described later protrudes from the exposure hole 35. Furthermore, a space that extends radially inward from the exposure hole 35 is an accommodation space 36 (a space 36) for accommodating the lid 32. The housing space 36 and the radially outer region of the sliding contact surface 31 </ b> S are communicated with each other through the exposure hole 35.

  The lid body 32 according to the present embodiment is a spherical member that is accommodated in the accommodation space 36 that is formed inside the exposure hole 35. A part of the spherical lid body 32 projects from the exposure hole 35 toward the outside (outside in the radial direction), thereby forming a projecting portion 32P. Further, the diameter of the lid 32 is set larger than the diameter of the exposure hole 35. Thereby, the cover body 32 can close | close the exposure hole 35 from radial inside.

  The lid body 32 is urged from the radially inner side to the outer side by an elastic member 34 (coil spring 34) provided on the pulley body 31. A dish-shaped retainer 38 is provided between the lid 32 and the elastic member 34. Due to the elastic restoring force of the coil spring 34, the lid body 32 is pressed from the radially inner side toward the exposure hole 35. Thereby, the outer surface 32S of the lid body 32 comes into contact with the end edge 35P of the exposure hole 35 from the radially inner side.

  The lubricating oil supply unit 33 supplies the lubricating oil L to the lid body 32 described above. More specifically, the lubricating oil supply part 33 supplies the tank part 331 which is a space formed inside the pulley body 31 and the lubricating oil L supplied from the tank part 331 to the surface of the lid 32. A supply hole 332 for performing the operation.

  The supply hole 332 is opened toward the accommodation space 36. In the present embodiment, one supply hole 332 is formed on each of the one side and the other side in the axis O direction of the pulley body 31. The tank portion 331 is filled with lubricating grease or the like (lubricating oil L) from the outside through a nipple (not shown).

  In the pulley apparatus 3 configured as described above, when the piping tube 4 is not in contact with the sliding contact surface 31S, the lid 32 is in contact from the inside of the exposure hole 35 as shown in FIG. Therefore, the lubricating oil L does not exude to the outside.

  On the other hand, as shown in FIG. 6, when the piping tube 4 comes into contact with the sliding contact surface 31 </ b> S, the lid body 32 immerses inward in the radial direction due to the weight of the piping tube 4. Fits in. At this time, a slight gap G is formed between the edge 35P of the exposure hole 35 and the outer surface 32S of the lid body 32. Through this gap G, the lubricating oil L in the tank portion 331 exudes toward the surface of the piping tube 4. The oozed lubricating oil L adheres to the piping tube 4 and then spreads on the sliding contact surface 31S in the circumferential direction. Thereby, the space between the surface of the piping tube 4 and the sliding contact surface 31S of the pulley device 3 is lubricated.

  As described above, according to the pulley device 3 according to the present embodiment, the lid 32 is supported by the elastic member 34 and closes the exposure hole 35 when the piping tube 4 is not in contact. On the other hand, when the piping tube 4 comes into contact with the protruding portion 32P, the lid body 32 is immersed inside the pulley main body 31 in the radial direction, and the lubricating oil L oozes out on the sliding contact surface 31S. Thereby, the space between the piping tube 4 and the sliding contact surface 31S can be lubricated. Furthermore, in a state where it does not contact the piping tube 4, the lid 32 closes the exposure hole 35, so that leakage of excess lubricating oil L can be suppressed.

  Furthermore, according to said structure, in the state which the piping tube 4 and the cover body 32 contact | abutted, it can rotate smoothly because the cover body 32 makes spherical shape. Furthermore, even when slippage occurs between the lid body 32 and the piping tube 4, the possibility that the lid body 32 scratches the piping tube 4 can be reduced.

  In addition, according to the above configuration, since the lubricating oil L can be held in the tank portion 331, the pulley device 3 can be lubricated without continuously supplying the lubricating oil L from the outside.

  In addition, according to the above configuration, it is possible to lubricate the entire sliding surface 31S in the circumferential direction. Further, even when slippage occurs between the piping tube 4 and the sliding contact surface 31S, the sliding contact surface 31S continues to be lubricated because any one or more lids 32 are in contact with the piping tube 4. be able to.

  The embodiments of the present invention have been described above with reference to the drawings. However, the above configuration is only an example, and various changes and modifications can be added thereto.

  For example, in the above embodiment, an example in which a spherical member is employed as the lid 32 has been described. However, the form of the lid body 32 is not limited to a spherical shape, and a lid body 320 having a trapezoidal cross section as shown in FIGS. 8 and 9 may be used. The lid 320 is formed such that the dimension in the direction of the axis O gradually decreases from the inside in the radial direction toward the outside. Thereby, it can be fitted into the exposure hole 35 from the inside in the radial direction. Further, the radially outer edge of the lid 320 protrudes with respect to the curved sliding contact surface 31S to form the protruding portion 32P in the same manner as described above.

  Even with such a configuration, the lubricating oil L can be exuded toward the surface of the piping tube 4 by closing and opening the exposure hole 35 as in the case of the spherical lid body 32.

  Furthermore, in the said embodiment, the aspect of the pulley apparatus 3 was demonstrated to the example of the piping tube 4 connected to the cylinder for tilts. However, the application target of the pulley device 3 is not limited to this. For example, in the forklift 100 having an M-type mast portion, the above-described hydraulic cylinder used for raising and lowering the middle mast and the hydraulic piping 4 are described above. The pulley apparatus 3 can be applied.

  In addition, in the above embodiment, the example in which the lubricating oil supply unit 33 is provided inside the pulley main body 31 has been described. However, the aspect of the lubricating oil supply unit 33 is not limited to this, and it is possible to adopt a configuration in which the lubricating oil is supplied from the outside of the pulley body 31.

DESCRIPTION OF SYMBOLS 1 ... Vehicle body 2 ... Cargo handling device 3 ... Pulley device 4 ... Hydraulic piping 4 ... Piping tube 10 ... Driver's cab 11 ... Wheel 21 ... Base frame 22 ... Mast device 23 ... Wheel 31 ... Pulley body 32 ... Cover body 33 ... Supply of lubricating oil Part 34 ... Elastic member 35 ... Exposure hole 36 ... Housing space 34 ... Coil spring 38 ... Retainer 100 ... Forklift 221 ... Outer mast 222 ... Inner mast 223 ... Lift bracket 224 ... Fork part 225 ... Lift cylinder 226 ... Chain 227 ... Gear 228 ... Support beam 229 ... Tilt hydraulic cylinder 320 ... Lid body 331 ... Tank part 332 ... Supply hole 225A ... Cylinder part 225B ... Rod part 31S ... Sliding contact surface 32P ... Projection part 32S ... Outer surface of lid body 35P ... End of exposure hole Edge G ... Gap L ... Lubricant O ... Axis

Claims (5)

It has a slidable contact surface that is rotatable about an axis and extends in the circumferential direction of the axis so that the piping tube is wound from the outer peripheral side. A space is formed inside the space, and the space and the slidable contact surface A pulley body in which an exposed hole communicating with the radially outer side is formed;
A lid provided in the space and capable of closing the exposure hole from the radial inner side of the axis;
A lubricating oil supply section for supplying lubricating oil to the lid;
An elastic member that is provided on the pulley body and biases the lid body from the radially inner side to the outer side of the axis;
A pulley apparatus comprising:   The pulley apparatus according to claim 1, wherein the lid body has a diameter larger than that of the exposure hole.   The pulley apparatus according to claim 1, wherein the lubricating oil supply unit includes a tank part formed in the space in the pulley body, and a supply hole that opens from the tank part toward the lid. . A plurality of the exposed holes are formed at intervals in the circumferential direction of the sliding contact surface,
The pulley device according to any one of claims 1 to 3, wherein a plurality of the lids are provided corresponding to the plurality of exposure holes. A forklift comprising the pulley device according to any one of claims 1 to 4.

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