JP2007039168A - Hook device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hook device capable of making it difficult for a hook member to be dropped out of a housing. <P>SOLUTION: This hook device is provided with the housing 2 having an opening 3 in the lower part; the hook member 4 inserted into the opening 3 and having a shaft 5 rotatably supported by the housing 2; a bearing 10 interposed between the housing 2 and the shaft 5 and facilitating relative rotation of the housing 2 and the shaft 5; a cover 12 into which the shaft 5 is inserted and which closes the opening 3 and is fixed to the housing 2; and a collar 6 provided in the shaft 5 and preventing the shaft 5 from being dropped out from the bearing 10. The collar 6 is formed integrally with the shaft 5 to prevent the collar 6 from coming off from the shaft 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a housing having an opening at a lower portion, a hook member formed with a shaft inserted into the opening and rotatably supported by the housing, a thrust bearing interposed between the housing and the shaft, and an opening through which the shaft is inserted. The present invention relates to a hook device including a lid that is fixed to a housing and a hook that is provided on a shaft and prevents the shaft from coming off from a thrust bearing.

  As a prior art of the hook device, there is one disclosed in Patent Document 1. In this prior art, a housing having an opening in the lower portion, a hook member formed with a shaft inserted into the opening and rotatably supported by the housing, a thrust bearing interposed between the housing and the shaft, and the shaft are inserted. A lid that closes the opening and is fixed to the housing, and a flange that is provided on the shaft and prevents the shaft from coming off from the thrust bearing. The rod is provided by screwing a nut having a larger outer diameter than the shaft into a shaft portion protruding upward from the thrust bearing.

The housing is swingably attached to the bucket of the front working machine of the excavator.
JP 2001-240365 A

  In the prior art, if the lubricating oil is insufficient between the shaft of the hook member and the thrust bearing due to poor maintenance, the shaft will be worn and rattled against the thrust bearing. This looseness wears down the thread that screwes the shaft and the flange (nut), thereby reducing the coupling force between the shaft and the flange. For this reason, in the worst case, there is a problem that the hook is detached from the shaft and the shaft is pulled out from the thrust bearing, that is, the hook member is dropped from the housing.

  Moreover, the said prior art is attached to the bucket of the front working machine of a hydraulic shovel. In other words, exposure to soil or water during excavation work on the ground or bottom promotes the lack of lubricating oil, and the impact transmitted from the front working machine promotes wear and backlash of the shaft. For this reason, the said problem tends to arise especially.

  The present invention has been made in consideration of the above-described actual situation, and an object of the present invention is to provide a hook device that can prevent the hook member from coming off from the housing.

  [1] In order to achieve the above object, the present invention provides a housing having an opening in a lower portion, a hook member formed with a shaft inserted into the opening and rotatably supported by the housing, the housing, A thrust bearing interposed between the shafts, a lid that is inserted through the shaft to close the opening and is fixed to the housing, and a flange that is provided on the shaft and prevents the shaft from coming off from the thrust bearing. In the hook device, the hook is formed integrally with the shaft.

  In the present invention configured as described above, a hook for preventing the shaft from coming off from the thrust bearing is formed integrally with the shaft. Thereby, even if the shaft becomes loose due to wear of the shaft due to lack of lubricating oil, the heel does not come off the shaft. That is, the hook formed integrally with the shaft can reliably prevent the shaft of the hook member from coming off from the thrust bearing. Therefore, it is possible to make it difficult for the hook member to fall out of the housing.

  [2] The present invention is the invention according to [1], wherein the flange also serves as a shaft washer which is one of a pair of washers of the thrust bearing, and the lid is the other of the pair of washers. It also serves as a washer on the housing side.

  [3] According to the present invention, in the invention described in [1], a male screw is formed on a side surface of the lid, a female screw is formed on the inner peripheral surface of the opening, and the male screw is formed up to an end of the female screw. The arrangement relationship between the hook member and the housing is set so that the upper end of the hook member and the housing are separated from each other in a state where the hook members are engaged with each other.

  [4] The present invention is characterized in that, in the invention according to [1], the front working machine of the excavator is provided with mounting means for mounting the housing in a swingable manner.

  In the present invention, as described above, the hook for preventing the shaft from coming off from the thrust bearing is formed integrally with the shaft and does not come off the shaft, so that the hook member can be prevented from coming off from the housing. . Thereby, safety can be improved compared with the past.

  One embodiment of a hook device of the present invention is described using figures. FIG. 1 is a partial cross-sectional view showing the configuration of the present embodiment, FIG. 2 is a view showing how the lid shown in FIG. 1 is attached, and FIG. 3 is a side view of a hydraulic excavator to which the embodiment shown in FIG. It is.

  This embodiment is a hook device 1 shown in FIG. This hook device 1 is interposed between a housing 2 and a shaft 5, a housing having an opening 3 in the lower portion, a hook member 4 formed with a shaft 5 inserted into the opening 3 and rotatably supported by the housing 2. A thrust bearing that facilitates relative rotation between the housing 2 and the shaft 5, for example, a thrust ball bearing 10 (hereinafter simply referred to as “bearing 10”), the shaft 5 is inserted, the opening 3 is closed, and the housing 2 is fixed. And a lid 12 provided on the shaft 5 to prevent the shaft 5 from coming off from the bearing 10.

  The hook member 4 has a hook body 7 below the shaft 5. The hook body 7 is provided with a locking member 9 that closes the hook 7c so that the hooked body does not come off. The detachment prevention member 9 is pin-coupled to the hook body 7 and is urged in a closing direction by a torsion coil spring (not shown).

  Further, the flange 6 is formed integrally with the shaft 5.

  Further, the flange 6 also serves as a washer on the shaft 5 side which is one of a pair of washers of the bearing 10, and the lid 12 also serves as a washer on the housing 2 side which is the other of the pair of washers. In addition, although not shown in figure, between the cage | basket 6 and the lid | cover 12, the holder | retainer which hold | maintains the several ball | bowl 11 at equal intervals is provided.

  Further, a male screw 12 b is formed on the side surface of the lid 12, and a female screw 3 a on which the male screw 12 b of the lid 12 is screwed is formed on the inner peripheral surface of the opening 3 of the housing 2. Furthermore, the arrangement relationship between the hook member 4 and the housing 2 is set so that the upper end of the shaft 5 is separated from the housing 2 in a state where the male screw 12b is screwed to the end of the female screw 3a.

  The diameter of the hole 12a of the lid 12 through which the shaft 5 is inserted is substantially the same as the diameter of the shaft 5. Further, as shown in FIG. 2, the hook body 7 is formed to be thinner than the shaft 5 as a whole including the pin coupling portion 7 b with the anti-separation member 9. That is, the lid 12 is inserted through the tip 7a of the hook body 7 and further through the pin coupling portion 7b with the locking member 9, and is then disposed on the outer peripheral side of the shaft 5 to close the opening 3 of the housing 2. Yes.

  In the present embodiment, the attachment means 20 for attaching the housing 2 to a predetermined work machine so as to be swingable is provided.

  The attachment means 20 includes a pin insertion member 21 having a pin hole 21a through which a pin provided in a predetermined work machine is inserted, and a pin coupling portion 22 that couples the lower portion of the pin insertion member 21 and the upper portion of the housing 2 with each other. I have.

  In FIG. 1, 25 is a pin of the pin coupling part 22, and is arranged along the left-right direction of FIG. On the other hand, the pin hole 21a of the pin insertion member 21 is penetrated in the direction orthogonal to the paper surface of FIG. That is, the pin coupling portion 22 is provided so that the rotation direction of the pin insertion member 21 with respect to a predetermined work machine and the rotation direction of the housing 2 with respect to the pin insertion member 21 are orthogonal to each other.

  In FIG. 1, 30 is a grease nipple for supplying lubricating oil to the pin hole 21a, and 31 is provided at one end of the pin 25, and an oil passage (not shown) formed in the pin 25 from this one end. It is a grease nipple for supplying lubricating oil to the pin coupling part 22 through. Reference numerals 32 and 33 denote bolts and keys for fixing the pin 25.

  The predetermined work machine is, for example, a hydraulic excavator 40 shown in FIG. The hydraulic excavator 40 includes a traveling body 41 that causes the hydraulic excavator 40 to travel, a revolving body 42 that is turnably provided on the traveling body 41, and a front work that is rotatably provided at a front center of the revolving body 42. Machine 43.

  The front work machine 43 includes a boom 44 having one end pin-coupled to the revolving body 42 and rotatably supported, and an arm 45 having one end pin-coupled to the other end of the boom 44 and pivotally supported. The other end of the arm 45 is provided with a bucket 46 having one end pin-coupled and rotatably supported. The boom 44 is driven by a boom cylinder 47. In this boom cylinder 47, a cylinder (not shown) is pin-coupled to the swing body 42, and a rod 47 b is pin-coupled to the boom 44. The arm 45 is driven by an arm cylinder 48. In the arm cylinder 48, the cylinder 48 a is pin-coupled to the boom 44, and the rod 48 b is pin-coupled to the arm 45. The bucket 46 is driven by a bucket cylinder 49. The cylinder 49a of the bucket cylinder 49 is coupled to an arm 45 pin. A link member 50 that is pin-coupled to the bucket 46 and a link member 51 that is pin-coupled to the arm 45 are pin-coupled to the rod 49 b of the bucket cylinder 49.

  The housing 2 of the hook device 1 according to the present embodiment is pin-coupled to the bucket 46 together with the link member 50 via the mounting means 20 described above. That is, the pin 53 of the pin coupling portion 52 of the link member 50 and the bucket 46 is inserted through the pin hole 21 a of the pin insertion member 21. Thereby, the hook device 1 is suspended so as to be swingable with respect to the bucket 46 of the front work machine 43.

  The link member 50 is provided with a recess (not shown) in which the hook device 1 can be stored and a means (not shown) for fixing the stored hook device 1, whereby the front work machine 43 is hooked. The work can be performed with the apparatus 1 mounted.

  According to this embodiment, the following effects can be obtained.

  In the present embodiment, a flange 6 that prevents the shaft 5 from coming off from the bearing 10 is formed integrally with the shaft 5. Thereby, even if the shaft 5 becomes loose due to wear of the shaft 5 due to lack of lubricating oil, the flange 6 does not come off from the shaft 5. That is, the hook 6 integrally formed with the shaft 5 can reliably prevent the shaft 5 of the hook member 4 from coming off from the bearing 10. Therefore, it is possible to make it difficult for the hook member 4 to come off from the housing 2 and to contribute to an improvement in safety.

  Further, since the present embodiment is attached to the bucket 46 of the excavator 40, the shortage of lubricating oil is promoted by exposure to soil or water during excavation work on the ground or bottom, and the impact transmitted from the front work machine. This promotes shaft wear and backlash, but can improve durability against such harsh environments.

  In the present embodiment, the flange 6 also serves as a washer on the shaft 5 side that is one of the pair of washers of the bearing 10, and the lid 12 also serves as a washer on the housing 2 side that is the other of the pair of washers. Thereby, the number of parts can be reduced.

  In the present embodiment, the housing 5 is separated from the upper end of the shaft 5 in a state where the male screw 12b is screwed to the end of the female screw 3a. Thereby, the lid 12 can be tightened and firmly fixed to the housing 2.

  In the present embodiment, the flange 6 serves as a washer on the shaft 5 side which is one of a pair of washers of the thrust bearing 10, and the lid 12 serves as a washer on the housing 2 side. However, the washer 6 and the flange 6 on the shaft 5 side may be separate, and the washer on the housing 2 side and the lid 12 may be separate.

It is a fragmentary sectional view which shows the structure of one Embodiment of the hook apparatus of this invention. It is a figure which shows a mode that the cover shown in FIG. 1 is attached. FIG. 2 is a side view of a hydraulic excavator to which the embodiment shown in FIG. 1 is attached.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hook apparatus 2 Housing 3 Opening 3a Female screw 4 Hook member 5 Shaft 6 ７ 7 Hook main body 10 Thrust ball bearing 12 Lid 12a Hole 12b Male screw 20 Mounting means 21 Pin insertion member 21a Pin hole 22 Pin coupling part 23A Pin insertion part 23B Pin insertion part 23B Portion 24 Pin insertion portion 25 Pin 40 Hydraulic excavator 43 Front work machine 46 Bucket 50 Link member 52 Pin coupling portion 53 Pin

Claims (4)

  A housing having an opening in a lower portion; a hook member formed with a shaft inserted into the opening and rotatably supported by the housing; a thrust bearing interposed between the housing and the shaft; In a hook device including a lid that closes an opening and is fixed to the housing, and a hook that is provided on the shaft and prevents the shaft from coming off from the thrust bearing, the hook is formed integrally with the shaft. A hook device characterized by that. The flange also serves as a washer on the shaft side which is one of a pair of washers of the thrust bearing,
The hook device according to claim 1, wherein the lid also serves as a washer on the housing side which is the other of the pair of washers. A male thread is formed on the side of the lid,
A female screw is formed on the inner peripheral surface of the opening to which the male screw is screwed.
The arrangement relationship between the hook member and the housing is set so that the upper end of the hook member and the housing are separated from each other when the male screw is screwed to the end of the female screw. The hook device according to 1.   The hook device according to claim 1, further comprising mounting means for swingably mounting the housing on a front working machine of a hydraulic excavator.

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