JP2006328848A - Shaft structure of working device operating part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of reducing the number of parts of a work machine by integrating members disposed near the operating part of a working device. <P>SOLUTION: In this shaft structure, a pipe guide 7 is fixed to the pivotally supporting part 3 for the shaft 5 of the working device operating part 6. An engagement part 20 is formed on one or both of these members 5 and 7 so that the pipe guide 7 can be engaged with the shaft 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shaft structure of a working device operating portion of a work machine.

  Although hoses and pipes are arranged on the side surfaces of the operating parts (for example, booms, arms, and cylinders thereof) of the working device (for example, the front working part) of the work machine, the hoses are bent when the operating part is rotated. If it protrudes to the outside, there is a possibility that it will break due to interference with an external object, so a piping guide is arranged to prevent it. As conventional examples of this pipe guide, there are structures disclosed in Japanese Utility Model Laid-Open No. 6-8458 and Japanese Patent Laid-Open No. 2000-38740. Japanese Utility Model Laid-Open No. 6-8458 has the structure shown in FIG. 5, and Japanese Patent Application Laid-Open No. 2000-38740 has the structure shown in FIG. 6. In any structure, the contact range of the bent hose 6 is the smallest. A piping guide 21 is disposed in the vicinity of the boom shaft (shaft pin 20). According to these structures, even if the hose 6 moves due to rotation of the operating part, contact with the pipe guide 21 is minimized, and the risk of damage to the hose 6 due to contact can be prevented to the maximum. ing.

ACT 6-8458 (Fig. 2) JP 2000-38740 (FIG. 4)

  By the way, the axis | shaft of the operation | movement part of work apparatuses, such as a boom axis | shaft, is equipped with the pin stop for a drop and backlash prevention. FIG. 7 shows the structure of a conventional pin stop 22 (an example applied to the shaft pin 20 of the boom cylinder 2). As shown in the figure, the pin stop 22 has a single structure.

  On the other hand, in recent years, work machines are increasingly demanded to reduce the number of parts from the viewpoint of cost reduction.

  The present invention was devised in view of the background as described above in the prior art, and is a structure that can reduce the number of parts of a work machine by integrating members arranged in the vicinity of an operation part of a work device. Is to provide.

  As a result of examining members that can be integrated from the knowledge of reducing the number of parts, the present inventors have focused on the fact that, as described above, a piping guide having excellent characteristics is disposed in the vicinity of the axis of the work machine operating unit. As a result of various studies on the structure of the member and the pinning, the present invention has been invented.

  That is, the shaft structure of the working device operating portion according to the present invention is a shaft structure in which the piping guide is fixed to the shaft support portion of the working device operating portion, and when the piping guide is fixed, An engaging portion is formed on one or both of the members so that the shafts engage with each other.

  Here, the working device operating section refers to operating means, a boom, an arm, a cylinder thereof, and the like among working devices (for example, a front structure) in a working machine.

  In addition, the formation of the engaging portion referred to in the present application means that the shaft and the pipe guide are structurally engaged with each other so that the rotation operation of the shaft main body is blocked. Is formed into a predetermined shape (when a notch in the first embodiment described later, a fitting groove in the second embodiment, a slit, a hole, or the like is formed). In addition to being formed on one of the pipe guide and the shaft, it may be formed on both. In the case of a loosely engaged configuration in which the protruding shaft tip fits into the fitting portion of the pipe guide as in the second embodiment described later, other configurations (the fitting portion in the same embodiment) The engagement state referred to in the present application is achieved by blocking the rotation of the shaft by the pressure contact action.

  In the present invention, when the pipe guide is fixed to the shaft support portion, the pipe guide and the shaft are engaged via an engaging portion formed on one or both of them. This engagement blocks the rotational movement of the shaft. That is, the piping guide has a pinning function.

  As described above, according to the present invention, the piping guide can be provided with a pinning function, and no single pinning means is required, so that the number of parts can be reduced. Of course, since the piping guide is disposed in the vicinity of the shaft, the effect of minimizing contact with the bending hose and preventing damage to the hose can be maintained as usual.

  An example of a specific embodiment of the present invention will be described with reference to the drawings. It should be noted that the following embodiment is merely an example embodying the present invention, and the present invention is naturally not limited thereto.

  FIG. 1 shows a first embodiment, which shows a boom base end portion of a hydraulic excavator as a work machine. In the figure, 1 is a boom, 2 is a boom cylinder, 3 is a boom cylinder bracket (hereinafter simply referred to as a cylinder bracket), 4 is a fuselage body, 5 is a boom cylinder shaft pin, 6 is a hydraulic hose, and 7 is a piping guide.

  As shown in the figure, this embodiment is an example in which a pipe guide 7 is disposed in the vicinity of the shaft pin 5 that supports the boom cylinder 2. Of course, a pipe guide may be arranged in the vicinity of each axis of the boom 1, the arm, the arm cylinder, the bucket, and the bucket cylinder (not shown except for the boom) which are other operation parts.

  As shown in FIG. 2, the pipe guide 7 of this embodiment is made of a vertically long plate-like member, and has two bolt holes 10 formed on one end side in the width direction, and a hose 6 penetrating portion on the other end side. A U-shaped fastener 11 that protrudes outward is provided. The end portion 12 on the side of the fastener 11 becomes a portion (engaged portion) to be engaged with a notch (engagement portion 20) of a shaft pin 5 described later.

  As shown in FIG. 3, the shaft pin 5 of the present embodiment uses a shaft pin having a length that protrudes at least from the width of the cylinder bracket 3, and cuts almost half of the end surface on either end surface. The semicircular engaging portion 20 is formed in a side view.

  Therefore, with both end portions of the shaft pin 5 protruding from both ends of the cylinder bracket 3, the end portion 12 that is the engaged portion of the pipe guide 7 is brought into contact with the engaging portion 20 of the shaft pin 5. When one end side of the shaft pin 5 is fastened to the cylinder bracket 3 with the bolt 13 from the bolt hole 10, the shaft pin 5 is connected to the end portion 12 of each engaged pipe guide 7 as shown in FIG. It is sandwiched and firmly fixed to the cylinder bracket 3. That is, the pipe guide 7 also functions as a pin for the shaft pin 5.

  Moreover, since the protruding position of the fastener 11 is formed on the engaged portion side in the pipe guide 7 of this embodiment, the fastener 11 is pinned in the fixed state of the pipe guide 7 as shown in FIG. Even if the hose 6 moves when the boom cylinder 2 rotates in conjunction with the boom 1, the contact between the hose 6 and the piping guide 7 is minimized, and the hose 6 by contact The risk of damage is prevented to the maximum.

  FIG. 4 shows a second embodiment. This embodiment is an embodiment in which the present invention is basically applied to the same position as the first embodiment, and this figure shows only one end face side of the shaft pin 5 '. In this embodiment, it is only necessary to use a shaft pin 5 'having a length in which both ends 20' protrude from both ends of the cylinder bracket 3, and no particular processing is performed. On the other hand, for the pipe guide 7 ′, bolt holes 10 ′ are formed above and below the elongated metal plate. In addition, a U-shaped fastener 11 ′ is provided to project outwardly between the bolt holes 10 ′ on the surface, and a fitting groove 12 ′ (the end of the shaft pin 5 ′ is fitted on the back surface thereof. (Engagement part) is drilled.

  Therefore, with both end portions of the shaft pin 5 'protruding from both ends of the cylinder bracket 3, the end portion of the shaft pin 5' is fitted into the fitting groove 12 'serving as the engagement portion of the pipe guide 7'. In this state, when the bolt hole 10 'is fastened to the cylinder bracket 3 with the bolt 13, as shown in FIG. 4, both ends of the shaft pin 5' are engaged with each pipe guide 7 'and the same guide. The engagement with the fitting groove 12 ′ is brought about by the pressure contact action by the fastening of 7 ′, and the cylinder bracket 3 is firmly fixed. That is, also in this embodiment, the pipe guide 7 ′ functions as a pin for the shaft pin 5 ′.

  Even in the pipe guide 7 ′ of the present embodiment, the protruding position of the fastener 11 ′ is formed on the back surface of the fitting groove 12 ′ serving as the engaging portion. 4, the fastener 11 ′ is positioned on the pin shaft 5 ′. As in the above embodiment, the contact between the hose and the pipe guide 7 ′ is minimized, and the hose by contact The risk of damage is prevented to the maximum.

  The present invention can be applied to a work machine in which a hose is disposed along a working device operating unit.

It is explanatory drawing of the 1st form example of this invention, and is a side view of a boom base end part. It is explanatory drawing of the piping guide of a 1st form example, (a) is a side view, (b) is a top view. It is detail drawing of a 1st form example, (a) is a fragmentary sectional view of the axial pin vicinity, (b) is an end elevation for demonstrating the axial pin engaging part in (a). It is explanatory drawing of the 2nd form example of this invention, (a) is a fragmentary sectional top view near an axial pin, (b) is the side surface for demonstrating the back surface (engagement part) of the piping guide in (a). FIG. It is explanatory drawing of the conventional piping guide disclosed by Japanese Utility Model Laid-Open No. 6-8458. It is explanatory drawing of the conventional piping guide disclosed by Unexamined-Japanese-Patent No. 2000-38740. An example of a conventional pinning structure applied to a shaft pin of a boom cylinder is shown, (a) is a partial sectional view of one structural example, and (b) is a partial sectional view of another structural example.

Explanation of symbols

1 Boom
2 Boom cylinder
3 Boom cylinder bracket
4 Airframe body
5-axis pin
6 Hydraulic hose
7,7 'piping guide

Claims (1)

  A shaft structure in which a pipe guide is fixed to a shaft support portion of a shaft of a work device operation unit, and when the pipe guide is fixed, both the pipe guide and the shaft are engaged with each other. A shaft structure of a working device operating portion, wherein one or both of them are formed with engaging portions.

Images