JP6597355B2 - Cylinder protection structure and work machine - Google Patents

Description

  The present invention relates to a protection structure for a cylinder and a technology related to the structure.

  2. Description of the Related Art Conventionally, in a working machine, a cover is provided on a hydraulic cylinder to prevent earth and sand or rocks from colliding with a rod portion. For example, in patent document 1, the boom cylinder (3) provided with the protection apparatus (2) for rods is disclosed. In this document, an outer rail cover (32) divided into two and an inner rail cover (35) are provided as protective covers for the rod (29). When the boom cylinder (3) is extended, the two rail covers (32, 35) are connected to each other to be in an extended state. On the other hand, when the boom cylinder (3) is reduced, the inner rail cover (35) is 32) It will be in an accommodation state. According to this, it can prevent that a cover interferes with the member provided in the outer periphery of the cylinder cylinder of a hydraulic cylinder.

Japanese Patent No. 3587597

  However, in the split type cover described in Patent Document 1, since the number of parts is increased, the configuration of the entire cylinder device is complicated, and the work efficiency during assembly is reduced.

  Therefore, an object of the present invention is to provide a cylinder protection structure capable of suppressing interference of a protective cover with a member attached to the outer periphery of a cylinder tube with a relatively simple configuration.

In order to achieve the above object, the present invention is a cylinder protection structure comprising a cylinder tube and a rod that protrudes from the tip of the cylinder tube so as to be extendable and contractible, and a rotation support portion provided at the tip of the rod; A sliding support provided on the cylinder tube, and a protective cover having a shape elongated in the extending / contracting direction of the cylinder, wherein one end side of the extending / contracting direction is an axis orthogonal to the extending / contracting direction as an axis. A protective cover that is rotatably supported by the moving support portion and is slidably supported by the sliding support portion between the one end side and the other end side, and is provided on the outer periphery on the proximal end side of the cylinder tube is the side where the protective cover is arranged which is attached the mounting member, said protective cover, the protective cover according to the expansion and contraction of the rod to the sliding support unit A rail portion is provided for sliding, and the other end side of the protective cover in the contracted state of the rod is compared with the other end side of the protective cover in the extended state of the rod. And a cylinder protection structure, wherein the other end side of the protective cover is disposed at a position where the rod does not interfere with the attached member in a contracted state of the rod. providing.

  Moreover, it is preferable that the said rail part is comprised so that the edge part of the said one end side may become closer to the axis | shaft of the said cylinder than the edge part of the said other end side in the said expansion | extension state.

  Further, the protective cover includes a protective surface of the rod, and a pair of side wall surfaces that are bent toward the cylinder side from an end in the orthogonal direction of the protective surface, and the rail portion includes the rail portion, Preferably, the pair of side wall surfaces are provided on a pair of side wall surfaces, and the pair of side wall surfaces are configured to increase in width from the other end side toward the one end side.

  The protective cover includes a protective surface of the rod, and a pair of side wall surfaces that bend toward the cylinder side from an end of the protective surface in a direction orthogonal to the expansion / contraction direction. It is preferable that the side wall surface has a width that covers the rod in a side view.

  Further, the rotation support part is constituted by a connection pin that connects a tip of the rod and a rotation link connected to the tip of the rod, and the connection pin is inserted into each of the pair of side wall surfaces. It is preferable that an insertion hole is formed.

  The rail portion includes a first section connecting a first point which is an end portion on the other end side and a second point which is closer to the one end side than the first point, the second point, and the second point. A second section connecting the third point on the one end side with respect to the point, and in the extended state, the first section is substantially parallel to the expansion and contraction direction of the cylinder, and the second section is the other end It is preferable to incline so that it may approach the said cylinder as it goes to the said one end side from the side.

  The rail portion includes a third section connecting a fourth point that is an end portion on the one end side and a fifth point that is on the other end side than the fourth point, and in the contracted state, The three sections are preferably substantially parallel to the expansion / contraction direction of the cylinder.

The present invention is a work machine, comprising a machine main body and an attachment attached to the machine main body, and the attachment includes a cylinder tube and a rod that protrudes from the tip of the cylinder tube so as to be extendable and contractible. A rotation support part provided at the tip of the rod, a sliding support part provided in the cylinder tube, and a protective cover having a shape elongated in the extension / contraction direction of the cylinder, the extension / contraction One end side of the direction is supported by the rotation support portion so as to be rotatable about an orthogonal direction orthogonal to the expansion and contraction direction, and the one end side and the other end side are slidably supported by the slide support portion. It has a protective cover that is, the, proximally periphery of the cylinder tube is mounted is the mounting member on the side where the protective cover is provided, the coercive The cover is provided with a rail portion for sliding the protective cover with respect to the sliding support portion according to the expansion and contraction of the rod, and the rail portion is the protective cover in the contracted state of the rod. The other end side of the protective cover is separated from the axis of the cylinder compared to the other end side of the protective cover in the extended state of the rod, and the other end side of the protective cover is in the contracted state of the rod. The present invention further provides a work machine that is disposed at a position that does not interfere with the mounted member .

  According to the present invention, the rail portion is configured such that the other end side of the protective cover in the contracted state is separated from the axis of the cylinder as compared with the other end side of the protective cover in the extended state. Therefore, it is possible to suppress the protective cover from interfering with members attached to the outer periphery of the cylinder tube with a relatively simple configuration.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. The perspective view which shows a part of attachment. The side view which shows the cylinder and protective cover which concern on 1st Embodiment. The perspective view which shows a protective cover. FIG. FIG. The figure which shows the state change (A) thru | or (C) of the protective cover at the time of rod contraction. The side view which shows the cylinder and protective cover which concern on 2nd Embodiment. IX arrow line view of FIG. X arrow line view of FIG. The figure which shows the state change (A) and (B) of a protective cover at the time of rod contraction. The figure for demonstrating the rail part which concerns on a modification. The figure which shows the state change (A) thru | or (D) of the protective cover at the time of rod contraction.

<1. First Embodiment>
A cylinder protection structure according to a first embodiment of the present invention will be described with reference to FIGS. Hereinafter, a hydraulic excavator 1 will be described as an example of a work machine according to the present invention.

  As shown in FIG. 1, the excavator 1 includes a crawler type lower traveling body 2 and an upper swing body 3. The upper swing body 3 is mounted on the lower travel body 2 and can swing around the vertical axis with respect to the lower travel body 2.

  The upper swing body 3 includes a machine main body 4 and an attachment 5 connected to the machine main body 4. The attachment 5 includes a boom 51, an arm 53, a bucket 55, and the like.

  As shown in FIG. 2, a pair of boom cylinders 7 for raising and lowering the boom 51 is mounted on the left and right sides of the boom 51. The boom cylinder 7 is an example of a cylinder according to the present invention.

  The boom cylinder 7 includes a cylinder tube 71 and a rod 73 that protrudes from the tip of the cylinder tube 71 so as to extend and contract. On the base end side of the cylinder tube 71, a member to be attached 75 such as a hose or an oil tightness holding function valve (holding valve) is attached.

  In addition, the boom cylinder 7 is provided with a protective cover 8 for protecting the rod 73 from earth and sand and rocks scattered during excavation work and the like. As shown in FIG. 3, the protective cover 8 has a long shape in the axial direction (extension / contraction direction) D <b> 1 of the boom cylinder 7.

  As shown in FIG. 4, the protective cover 8 includes a protective surface 81 that protects the rod 73 and a pair of side wall surfaces 83 and 85. The protective surface 81 is a surface facing the ground in excavation work or the like. The pair of side wall surfaces 83 and 85 are surfaces that bend toward the boom cylinder 7 from both ends of the protective surface 81 in the direction D2 orthogonal to the axial direction D1.

  Insertion holes 83h and 85h and rail portions 83r and 85r are formed in the pair of side wall surfaces 83 and 85, respectively. Of the pair of side wall surfaces 83, 85, the region where the rail portions 83r, 85r are formed is such that the width in the direction D4 orthogonal to the direction D2 increases as it proceeds from the proximal end side 8B of the protective cover 8 to the distal end side 8A. It is configured. The insertion holes 83h and 85h and the rail portions 83r and 85r will be described in detail later.

  As shown in FIG. 3, a rotation support portion 91 that rotatably supports the distal end side 8 </ b> A of the protective cover 8 is provided at the distal end 73 </ b> A of the rod 73. A sliding support portion 93 is provided on the outer peripheral surface of the cylinder tube 71 on the rod 73 side so as to be slidable between the distal end side 8A and the proximal end side 8B in the axial direction D1.

  As shown in FIG. 5, the rotation support portion 91 includes a connection portion 911 and a rotation shaft portion 913. The connection portion 911 is a member that connects the distal end 73A of the rod 73 and the rotation shaft portion 913. The rotation shaft portion 913 is a cylindrical member that can be inserted into the insertion holes 83 h and 85 h (FIG. 4) and functions as a rotation support shaft of the protective cover 8. Specifically, the rotation shaft portion 913 supports the protective cover 8 so as to be rotatable about a direction D2 orthogonal to the axial direction D1.

  As shown in FIG. 6, the sliding support portion 93 includes a connection portion 931 and a sliding portion 933. The connecting portion 931 is a member that connects the outer peripheral surface of the cylinder tube 71 and the sliding portion 933. The sliding portion 933 is configured by a flat plate-like member whose both ends can be inserted into the rail portions 83r and 85r described above. According to the expansion and contraction of the rod 73, the rail portions 83r and 85r slide (slide) in the axial direction D1 (FIG. 3) with respect to the sliding portion 933.

  Next, the shape of the rail portions 83r and 85r will be described with reference to FIG. Since the rail portions 83r and 85r have a symmetrical shape, only one rail portion 83r will be described here. For convenience of explanation, in FIG. 7, the rail portion 83 r that cannot be viewed from the side is represented by a solid line.

  As shown in FIG. 7A, in the extended state, the rail portion 83r is inclined so as to approach the axis of the boom cylinder 7 as it proceeds from the proximal end side 8B of the protective cover 8 to the distal end side 8A. That is, in the extended state, the rail portion 83r is formed such that the end portion PA2 on the distal end side 8A is closer to the axis of the boom cylinder 7 than the end portion PA1 on the proximal end side 8B.

  When the rod 73 gradually contracts from the extended state shown in FIG. 7A, the protective cover 8 rotates in the rotation direction D3 with the rotation shaft portion 913 as a support shaft, as shown in FIG. 7B. . Accordingly, the base end side 8B of the protective cover 8 gradually moves away from the axis of the boom cylinder 7.

  When the rod 73 further contracts from the state shown in FIG. 7B, the protective cover 8 further rotates in the rotation direction D3 with the rotation shaft portion 913 as a support shaft. Then, as shown in FIG. 7C, the boom cylinder 7 shifts to a contracted state. At this time, the base end side 8 </ b> B of the protective cover 8 is disposed at a position where it does not interfere with the attached member 75.

  As described above, in the first embodiment, as the rod 73 contracts, the protective cover 8 rotates in the rotation direction D3 using the rotation shaft portion 913 as a support shaft, and the base end side 8B of the protection cover 8 is Gradually move away from the axis of the boom cylinder 7. As a result, in the contracted state, the base end side 8B of the protective cover 8 is disposed at a position where it does not interfere with the attached member 75. That is, the base end side 8B of the protective cover 8 in the contracted state of FIG. 7C is further away from the axis of the boom cylinder 7 than the base end side 8B of the protective cover 8 in the extended state of FIG. Therefore, it is possible to suppress the base end side 8 </ b> B of the protective cover 8 from interfering with the attached member 75 when the rod 73 contracts with a relatively simple configuration.

  In the first embodiment, as shown in FIG. 4, rail portions 83 r and 85 r are formed on the pair of side wall surfaces 83 and 85 that constitute the protective cover 8. And the area | region in which the rail parts 83r and 85r are formed among a pair of side wall surfaces 83 and 85 is comprised so that the width | variety of the direction D4 may become large as it progresses from the base end side 8B of the protective cover 8 to the front end side 8A. ing. Therefore, as shown in FIG. 7, it is possible to reliably secure a space for configuring the end portion PA2 so as to be closer to the axis of the boom cylinder 7 than the end portion PA1.

<2. Second Embodiment>
In 1st Embodiment, while illustrating the boom cylinder 7 as an example of the cylinder which concerns on this invention, the rotation support part 91 shown in FIG. 5 was illustrated as an example of a rotation support part.

  On the other hand, in 2nd Embodiment, the arm cylinder 70 is illustrated as an example of the cylinder which concerns on this invention. Moreover, the connection pin 61 (FIG. 10) which connects the front-end | tip of a rod and a rotation link is illustrated as an example of the rotation support part which concerns on this invention. In addition, a rotation link is a link which connects the front-end | tip of a rod, and the bucket 55 (FIG. 1).

  Hereinafter, the cylinder protection structure according to the second embodiment will be described with reference to FIGS. 8 to 11. However, the description of the overlapping parts with the first embodiment is omitted.

  As shown in FIG. 8, the arm cylinder 70 includes a cylinder tube 710 and a rod 730. A protective cover 80 is attached to the arm cylinder 70.

  As shown in FIG. 9, the protective cover 80 includes a protective surface 810 that protects the rod 730 and a pair of side wall surfaces 830 and 850. As shown in FIG. 8, a rail portion 830 r is formed on the side wall surface 830. Although illustration is omitted, a rail portion is also formed on the side wall surface 850. Further, the pair of side wall surfaces 830 and 850 have a width that covers the rod 730 in a side view.

  Similarly to the first embodiment, the rail portion 830r is inclined so as to approach the axis of the arm cylinder 70 from the end portion PB1 on the base end side 80B toward the end portion PB2 on the front end side 80A. The rail part 830r and the rail part (not shown) symmetrical to the left and right also have the same configuration.

  9, the pair of side wall surfaces 830 and 850 are formed with insertion holes 830h and 850h for inserting the connecting pin 61, respectively. As shown in FIG. 10, the connecting pin 61 is a pin for connecting the tip 730 </ b> A of the rod 730 and the rotation link 63.

  As shown in FIG. 10, in the second embodiment, the pair of side wall surfaces 830 and 850 can be rotated by the connecting pin 61 while being sandwiched between the distal end 730 </ b> A of the rod 730 and the rotating link 63. It is connected.

  Accordingly, as shown in FIG. 11, when the rod 730 contracts, the protective cover 80 rotates in the rotation direction D3 with the connecting pin 61 as a support shaft. That is, when the rod 730 contracts, the proximal end side 80B of the protective cover 80 gradually moves away from the axis of the arm cylinder 70. In the contracted state, the protective surface 810 of the protective cover 80 is disposed at a position that does not interfere with the attached member 76. Therefore, also in the above-described configuration of the second embodiment, the same effect as that of the first embodiment can be obtained.

  Moreover, in 2nd Embodiment, as shown in FIG. 8, since a pair of side wall surface 830,850 is provided with the width | variety which covers the rod 730 in a side view, it is rod 730 from the earth and sand etc. which are scattered with excavation work. Can be more reliably protected.

  Further, in the second embodiment, by using the existing connecting pin 61, it is not necessary to separately provide the rotating shaft portion 913 as in the first embodiment, and the number of components can be reduced. Further, if the boss portion to which the connecting pin 61 is attached is greased, the rotating portion of the protective cover 80 is also greased, so that maintenance work is efficient.

<3. Modification>
The cylinder protection structure according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

  For example, in the second embodiment, as illustrated in FIG. 8, the rail portion 830r is illustrated as having a linear shape from the end portion PB1 on the proximal end side 80B to the end portion PB2 on the distal end side 80A. It is not limited to this. As will be described in detail below, the rail portion 831r shown in FIG. 12 may be formed in a polygonal line shape.

  As shown in FIG. 12, the rail portion 831r is composed of three sections SP1, SP2 and SP3. The section SP1 is a section connecting the point PC1 that is the end portion of the base end side 80B and the point PC2 that is located on the distal end side 80A from the point PC1. The section SP2 is a section connecting the point PC2 and the point PC3 located 80A on the tip side from the point PC2. The section SP3 is a section connecting the point PC3 and the point PC4 that is the end of the distal end side 80A.

  The sections SP1, SP2, and SP3 are examples of the first section, the second section, and the third section, respectively, according to the present invention. The points PC1, PC2, PC3, and PC4 are examples of the first point, the second point, the third point, and the fourth point, respectively, according to the present invention. The point PC3 is an example of the third point according to the present invention, and is also an example of the fifth point according to the present invention.

  As shown in FIG. 13A, in the extended state of the rod 730, the section SP1 is substantially parallel to the cylinder axial direction AX. Therefore, in the section SP1, the protective cover 80 does not rotate but moves to the contraction side while maintaining a state parallel to the axial direction AX (FIGS. 13A to 13B).

  On the other hand, in the extended state of the rod 730, the section SP2 is inclined so as to approach the arm cylinder 70 from the proximal end side 80B toward the distal end side 80A. Therefore, in the section SP2, the protective cover 80 moves to the contraction side while rotating (FIGS. 13B to 13C). Therefore, the base end side 80 </ b> B of the protective cover 80 is gradually separated from the axis of the arm cylinder 70.

  As shown in FIG. 13D, in the contracted state of the rod 730, the section SP3 is substantially parallel to the cylinder axial direction AX. Therefore, in the section SP3, the protective cover 80 does not rotate but moves to the contraction side while maintaining a state parallel to the axial direction AX (FIGS. 13C to 13D).

  According to such a modification, since the rotation of the protective cover 80 is suppressed by providing the section SP1 until it approaches the attached member 76, contact between the protective cover 80 and the ground or the like is avoided. Is possible. Further, by providing the sections SP2 and SP3, after the protective cover 80 is rotated by an angle necessary for avoiding the attached member 76, further rotation of the protective cover 80 is suppressed, and the protective cover 80 and the other cover Interference with equipment can be avoided.

  Moreover, although the rail part 831r illustrated the case where it comprised by three area SP1, SP2, SP3 in said modification, it is not limited to this. For example, the rail portion may be configured by only the section SP1 and the section SP2. Or you may make it a rail part be comprised only in area SP2 and area SP3.

  As described above, the configuration according to the present invention is suitable for use in a hydraulic excavator or the like equipped with a hydraulic cylinder having a protective cover.

1 hydraulic excavator, 2 lower traveling body, 3 upper turning body, 4 machine body,
5 Attachment, 7 Boom cylinder, 8 Protective cover, 8A Tip side,
8B Base end, 51 Boom, 53 Arm, 55 Bucket, 61 Connecting pin,
63 rotating link, 70 arm cylinder, 71 cylinder tube, 73 rod,
73A tip, 75,76 attached member, 80 protective cover, 80A tip side,
80B base end side, 81 protective surface, 83, 85 side wall surface, 83h, 85h insertion hole,
83r, 85r rail part, 91 rotation support part, 93 sliding support part,
710 cylinder tube, 730 rod, 730A tip, 810 protective surface,
830, 850 side wall surface, 830h, 850h insertion hole, 911 connection portion,
913 Rotating shaft part, 931 connecting part, 933 sliding part, AX axial direction,
PC1, PC2, PC3, PC4 point, SP1, SP2, SP3 section

Claims (8)

A cylinder protection structure comprising a cylinder tube and a rod projecting from the tip of the cylinder tube so as to expand and contract,
A pivot support provided at the tip of the rod;
A sliding support provided on the cylinder tube;
A protective cover having a shape elongated in the expansion / contraction direction of the cylinder, wherein one end side of the expansion / contraction direction is rotatably supported by the rotation support portion with an orthogonal direction orthogonal to the expansion / contraction direction as an axis. A protective cover that is slidably supported by the sliding support portion between the side and the other end side;
With
A member to be attached is attached to the base end side outer periphery of the cylinder tube on the side where the protective cover is disposed,
The protective cover is provided with a rail part for sliding the protective cover with respect to the sliding support part according to expansion and contraction of the rod.
The rail portion is configured such that the other end side of the protective cover in the contracted state of the rod is separated from the cylinder axis as compared to the other end side of the protective cover in the extended state of the rod .
The cylinder protective structure , wherein the other end side of the protective cover is disposed at a position where the rod does not interfere with the attached member in the contracted state of the rod .   The said rail part is comprised so that the edge part of the said one end side may become closer to the axis | shaft of the said cylinder than the edge part of the said other end side in the said expansion | extension state. Cylinder protection structure. The protective cover includes a protective surface of the rod, and a pair of side wall surfaces that bend toward the cylinder side from an end in the orthogonal direction of the protective surface,
The rail portion is provided on the pair of side wall surfaces,
3. The cylinder protection structure according to claim 1, wherein the pair of side wall surfaces are configured to have a width that increases from the other end side toward the one end side. The protective cover includes a protective surface of the rod, and a pair of side wall surfaces that bend toward the cylinder side from an end in the orthogonal direction of the protective surface,
The cylinder protective structure according to any one of claims 1 to 3, wherein the pair of side wall surfaces have a width that covers the rod in a side view. The rotation support portion is constituted by a connecting pin that connects a tip of the rod and a rotation link connected to the tip of the rod,
5. The cylinder protection structure according to claim 1, wherein an insertion hole through which the connecting pin is inserted is formed in each of the pair of side wall surfaces. The rail portion includes a first section connecting a first point which is an end portion on the other end side and a second point which is closer to the one end than the first point, and the second point and the second point. And a second section connecting the third point on the one end side,
In the extended state, the first section is substantially parallel to the expansion / contraction direction, and the second section is inclined so as to approach the cylinder from the other end side toward the one end side. The cylinder protective structure according to any one of claims 1 to 5. The rail portion includes a third section connecting a fourth point which is an end portion on the one end side and a fifth point which is on the other end side than the fourth point,
The cylinder protective structure according to any one of claims 1 to 6, wherein in the contracted state, the third section is substantially parallel to the expansion and contraction direction. A working machine,
The machine body,
An attachment attached to the machine body;
With
The attachment is
A cylinder comprising a cylinder tube and a rod projecting from the tip of the cylinder tube so as to extend and contract;
A pivot support provided at the tip of the rod;
A sliding support provided on the cylinder tube;
A protective cover having a shape elongated in the expansion / contraction direction of the cylinder, wherein one end side of the expansion / contraction direction is rotatably supported by the rotation support portion with an orthogonal direction orthogonal to the expansion / contraction direction as an axis. A protective cover that is slidably supported by the sliding support portion between the side and the other end side;
Have
On the base end side outer periphery of the cylinder tube, a mounted member is attached on the side where the protective cover is provided,
The protective cover is provided with a rail part for sliding the protective cover with respect to the sliding support part according to the expansion and contraction of the rod.
The rail portion is configured such that the other end side of the protective cover in the contracted state of the rod is separated from the cylinder axis as compared to the other end side of the protective cover in the extended state of the rod .
A work machine , wherein the other end side of the protective cover is disposed at a position where the rod does not interfere with the attached member in a contracted state of the rod .

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