JP2020037794A - Hydraulic shovel - Google Patents

Abstract

To provide a hydraulic shovel, a hydraulic hose of which is securely protected from damage by obstacles without using weldment, etc.SOLUTION: An idler link 11 is provided with: a cylinder side boss part 11b connected to a breaker cylinder 12; an arm side boss part 11a connected to a tip of an arm 8; and a pair of link plates 11c connecting the arm side boss part 11a and the cylinder side boss part 11b. Guide ribs 11d and 11e guiding a hydraulic hose 13 connected to a breaker 9 connects the pair of link plates 11c as well as are integrally formed between the pair of link plates 11c.SELECTED DRAWING: Figure 2

Description

  The present invention provides an arm which can be raised and lowered, a pair of idler links rotatably connected to both ends of the arm, a hydraulic cylinder for a working device having one end connected to the idler link, and a hydraulic cylinder for the working device. The present invention relates to a hydraulic shovel having a working device side link having one end connected to a distal end and a working device connected to the other end, and more particularly to a technique for guiding a hydraulic hose or an electric cable connected to the working device by an idler link.

  2. Description of the Related Art Conventionally, a hydraulic hose to a hydraulic drive unit of a working device provided at a tip of an attachment of a hydraulic shovel of this type is generally arranged on a side surface of an idler link at a tip of an arm. In this case, it is known that a hose guide is provided to restrict the movement of the hydraulic hose so that the hydraulic hose is not damaged during the work.

  For example, in the working machine of Patent Document 1, a hose guide in which both ends of a round bar bent in a U-shape are welded to the inner surface of an idler link is provided, and a hydraulic hose is passed between the hose guide and the inner surface of the idler link. I try to guide.

  Further, in the hydraulic excavator of Patent Document 2, a support pin is provided on a pedestal welded to an outer surface of an idler link, and a hose guide obtained by bending a metal plate in a cantilevered state is provided on the support pin so as to be rotatable. Guide through the hydraulic hose.

  Further, as in Patent Document 3, there is known a working machine in which a support plate is welded to an outer surface of an idler link, and a cover body holding an electrical cable is bolted up to the support plate.

JP 2006-97347 A JP 2000-110198 A JP 2017-25658 A

  However, the working machine disclosed in Patent Document 1 has a problem that it is difficult to provide a hose guide bent in a U-shape in a narrow region between the outer surface of the arm and the inner surface of the idler link. Further, since the round bar and the hydraulic hose rub against each other due to line contact, there is a problem that the wear of the hydraulic hose progresses at an early stage, especially in a breaker operation or the like in which hydraulic pulsation is likely to occur. Further, since both ends of the round bar are welded to the idler link, heat influence is caused by welding to the steel plate forming the idler link, and the strength may be reduced.

  In addition, in the case of Patent Document 2, the hose guide is added to the outside of the idler link that moves relatively large, so that the hose guide that protrudes in the width direction may be damaged by contacting an obstacle. In addition, it is necessary to weld the pedestal to the idler link, and there is a possibility that a thermal effect occurs due to welding to the steel plate forming the idler link, and the strength may be reduced.

  Furthermore, even if the structure of Patent Document 3 is applied to a hydraulic hose, the support plate must be welded to the outer surface of the idler link, and the bolts for attaching the steel plate cover protrude in the width direction. Bolts and the like may be damaged.

  The present invention has been made in view of such a point, and an object of the present invention is to ensure protection of a hydraulic hose so as not to be damaged by an obstacle without performing welding or the like. .

  In order to achieve the above object, in the present invention, a hydraulic hose is passed inside the idler link.

  Specifically, in the first invention, an up-and-down arm, a working device rotatably connected to a tip of the arm, and a pair of idler links rotatably connected to both ends of the arm. A hydraulic cylinder for a working device having one end connected to the idler link; and a working device side link having one end connected to the distal end of the working device hydraulic cylinder and the other end connected to the working device. Is assumed.

And the above idler link is
A cylinder-side boss portion connected to the working device hydraulic cylinder,
An arm-side boss connected to the tip of the arm;
A pair of link plates are provided at an interval from each other and connect the cylinder-side boss portion and the arm-side boss portion,
A guide rib for connecting the pair of link plates and guiding a hydraulic hose or an electric cable connected to the working device is integrally formed between the pair of link plates.

  According to the above configuration, by passing the hydraulic hose or the electric cable through the gap between the pair of link plates of the idler link, the hydraulic hose or the electric cable is less likely to be damaged during operation of the working device or the like. Further, the interval between the pair of link plates can be set relatively easily as compared with the case where a U-shaped member is welded as in Patent Document 1. Furthermore, if the guide ribs are formed integrally with the link plate, there is no need to weld a pedestal or the like to the idler link, and no thermal effect occurs due to welding to the steel plate forming the idler link, and strength does not decrease.

In the second invention, in the first invention,
At least the pair of link plates and the guide ribs are integrally formed by casting.

  According to the above configuration, if the guide ribs are integrally formed on the link plate by casting, the link plate can be easily formed and the strength can be easily secured. In addition, the cylinder side boss portion and the arm side boss portion may be welded to the one in which the guide rib and the pair of link plates are integrally formed by casting.

In a third aspect, in the first or second aspect,
The guide ribs extend from the cylinder-side boss portion and the arm-side boss portion, and their respective tips extend toward two opposing sides of the link plate.

  According to the above configuration, a hydraulic hose or an electric cable is secured in the space between the pair of guide ribs, and it is easy to pass the guide hose so as not to contact the guide rib. Also, the tip of the guide rib can be made as close as possible to the center in the longitudinal direction, and it is easy to reduce the strength reduction of the idler link due to the provision of the gap between the pair of link plates.

In a fourth aspect, in any one of the first to third aspects,
The guide rib extending from the arm-side boss is longer than the guide rib extending from the cylinder-side boss.

  According to the above configuration, when the idler link is rotated, the guide rib on the arm-side boss on the side where the amount of movement in the circumferential direction is small is made longer, so that the hydraulic hose is secured while maintaining the strength of the idler link. Alternatively, it is possible to prevent the electric cable from contacting the guide rib as much as possible.

In a fifth aspect, in any one of the first to fourth aspects,
A surface of the guide rib extending from the arm-side boss portion, which comes into contact with the hydraulic hose or the electric cable, is curved so as to bulge along the curved hydraulic hose or the electric cable,
A surface of the guide rib extending from the cylinder-side boss portion, which comes into contact with the hydraulic hose or the electric cable, is curved so as to be concave along the curved hydraulic hose or the electric cable.

  According to the above configuration, since the hydraulic hose or the electric cable comes into surface contact with the curved surface of the guide rib, the hydraulic hose or the electric cable is less painful.

  As described above, according to the present invention, the pair of link plates is connected between the pair of link plates, and the guide rib for guiding the hydraulic hose or the electric cable connected to the working device is formed, so that the idler is formed. By adding a hose guide function to the link itself, it is possible to reliably protect the hydraulic hose so as not to be damaged by an obstacle without performing welding or the like.

It is a side view showing an idler link concerning an embodiment of the present invention. It is a top view showing the idler link concerning the embodiment of the present invention. It is IC-IC sectional drawing of FIG. 1B. It is a side view which shows the arm tip and breaker when the breaker cylinder is extended. It is a side view which shows the arm tip and breaker when the breaker cylinder is contracted. It is a side view showing the hydraulic shovel concerning an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 shows a hydraulic excavator 1 according to an embodiment of the present invention. The hydraulic excavator 1 includes, for example, a lower traveling body 2 having a traveling crawler and the like, and an upper revolving superstructure rotatably provided on the lower traveling body 2. 3 and an attachment 4 supported on the upper swing body 3 so as to be able to undulate.

  The attachment 4 includes, for example, a lower boom 5 supported by the upper swing body 3, a lower cylinder 6 that supports the lower boom 5 so that the lower boom 5 can be raised and lowered, an arm 8 connected to a tip of the lower boom 5, and an arm 8. An arm cylinder 7 is supported so as to be able to move up and down, and a breaker 9 as a working device rotatably connected to the tip of the arm 8. One end 10a of a breaker link 10 is connected to the base end side of the breaker 9, and one end of the arm 8 is rotatably connected to the left and right sides of the distal end of the arm 8 to the other end 10b of the breaker link 10. Idler link 11 is connected. The other end 10b of the breaker link 10 and the other end of the idler link 11 are connected to the tip of a rod 12a of a breaker cylinder 12 as a hydraulic cylinder for working equipment. As shown in FIGS. 1A to 1C, the idler link 11 includes an arm-side boss 11 a connected to the tip of the arm 8 and a cylinder-side boss 11 b connected to the breaker cylinder 12. The arm-side boss 11a and the cylinder-side boss 11b are connected by a pair of link plates 11c. The pair of idler links 11 has the same shape on the left and right.

  Guide ribs 11d and 11e for connecting the pair of link plates 11c and guiding the hydraulic hose 13 connected to the breaker 9 are formed integrally between the pair of link plates 11c. In the present embodiment, the arm-side boss 11a, the cylinder-side boss 11b, the pair of link plates 11c, and the guide ribs 11d and 11e are integrally formed by casting. Note that the pair of link plates 11c and the guide ribs 11d and 11e may be integrally formed by casting, and the arm-side boss portion 11a and the cylinder-side boss portion 11b may be welded thereto. Since this welded portion is a portion having relatively high rigidity, it is relatively hard to be adversely affected by welding heat.

  As shown in FIG. 2, a pair of hydraulic hoses 13 are provided on the left and right corresponding to the supply side and the discharge side with respect to the breaker 9. The pair of hydraulic hoses 13 extend from a hydraulic valve provided on the upper swing body 3 (not shown), pass through the left and right sides of the arm 8, and are respectively fixed to clamps 14 provided on the left and right outer surfaces on the distal end side of the arm 8. I have. Further, the tip of the clamp 14 passes through a hose protection bracket 15 provided on the base end side of the breaker 9 through a space between the pair of guide ribs 11d and 11e, and the tip end is connected to the coupler 9a of the breaker 9.

  The pair of guide ribs 11d and 11e extend from the arm-side boss portion 11a and the cylinder-side boss portion 11b, and their respective tips extend toward two opposing sides (upper and lower sides in FIG. 1A) of the link plate 11c. . For this reason, the hydraulic hose 13 is easily passed through the space between the pair of guide ribs 11d and 11e so as not to contact the guide ribs 11d and 11e. Further, as shown in FIG. 1A in an enlarged manner, while securing a space for passing the hydraulic hose 13, the tip thereof (particularly, the tip of one guide rib 11 d) can be brought as close as possible to the center in the longitudinal direction. Easy to secure strength.

  Moreover, as shown in FIGS. 2 and 3, the surfaces of the guide ribs 11 d and 11 e that come into contact with the hydraulic hose 13 are curved in accordance with the curved shape of the hydraulic hose 13. Specifically, the guide rib 11d on the arm-side boss portion 11a is curved so as to expand toward the hydraulic hose 13, and the guide rib 11e on the cylinder-side boss portion 11b is adapted to follow the shape of the expanded hydraulic hose 13. It is curved so as to be depressed away from the hydraulic hose 13.

  The guide rib 11d extending from the arm-side boss 11a is longer than the guide rib 11e extending from the cylinder-side boss 11b. That is, the strength of the idler link 11 is ensured by making the guide rib 11d of the arm-side boss portion 11a on the side where the amount of movement of the hydraulic hose 13 in the circumferential direction small when the idler link 11 is rotated longer. However, it is possible to prevent the hydraulic hose 13 from contacting the guide ribs 11d and 11e as much as possible.

  In the present embodiment, since the guide ribs 11d and 11e are integrally formed on the link plate 11c by casting, there is no need to weld a pedestal or the like to the idler link 11, and the heat effect due to welding to the steel plate forming the idler link 11 is eliminated. It does not occur and the strength does not decrease.

  In addition, the interval between the pair of link plates 11c can be set relatively freely, and the hydraulic hose 13 may be passed between the guide ribs 11d and 11e. Space is easier to secure than when welding.

  Further, since the pair of idler links 11 has the same shape on the left and right, the same parts can be used on the left and right at the time of assembling, and the assembling is easy.

  Then, as shown in FIGS. 2 and 3, when the hydraulic oil is supplied and discharged through the hydraulic hose 13, the rod 12 a of the breaker cylinder 12 is expanded and contracted to raise and lower the breaker 9. Moves within a predetermined range, but the hydraulic hose 13 comes into contact with the curved surfaces of the guide ribs 11d and 11e in a plane, so that even if the hydraulic hose 13 is liable to generate hydraulic pulsation as in the present embodiment, the pain caused by the contact may occur. Less likely to occur.

  Further, since the hydraulic hose 13 is passed through the gap between the pair of link plates 11c of the idler link 11, it is possible to prevent the hydraulic hose 13 from being damaged by contact with a work during operation of the working device or the like.

  Therefore, according to the hydraulic excavator 1 according to the present embodiment, the pair of link plates 11c are connected between the pair of link plates 11c, and the guide ribs 11d and 11e for guiding the hydraulic hose 13 connected to the breaker 9 are provided. With this configuration, a hose guide function can be added to the idler link 11 itself, so that the hydraulic hose 13 can be reliably protected from being damaged by an obstacle.

(Other embodiments)
The present invention may be configured as follows in the embodiment.

  That is, in the embodiment, the breaker 9 is used as a working device at the tip of the arm 8, but may be a crushing device, a crushing device, a grab bucket, a lifting magnet, or the like. It is preferable to pass through a gap between the pair of link plates 11c.

  The above embodiment is essentially a preferred example, and is not intended to limit the scope of the present invention, its application, and use.

1 Hydraulic excavator
2 Undercarriage
3 Upper revolving superstructure
4 Attachment
5 Lower boom
6 Lower cylinder
7 Arm cylinder
8 arm
9 Breaker (work equipment)
9a coupler
10 Breaker link
10a One end
10b The other end
11 Idler Link
11a Arm side boss
11b Cylinder side boss
11c Link board
11d, 11e Guide rib
12 Breaker cylinder (hydraulic cylinder for working equipment)
12a rod
13 Hydraulic hose
14 Clamp
15 Protection bracket

Claims (5)

An up-and-down arm, a working device rotatably connected to the tip of the arm, a pair of idler links rotatably connected to both ends of the arm, and an operation in which one end is connected to the idler link. In a hydraulic shovel having a device hydraulic cylinder and a working device-side link having one end connected to the tip of the working device hydraulic cylinder and the other end connected to the working device,
The above idler link is
A cylinder-side boss portion connected to the working device hydraulic cylinder,
An arm-side boss connected to the tip of the arm;
A pair of link plates are provided at an interval from each other and connect the cylinder-side boss portion and the arm-side boss portion,
A hydraulic excavator, wherein a pair of link plates are connected to each other, and a guide rib for guiding a hydraulic hose or an electric cable connected to the working device is formed integrally. The hydraulic excavator according to claim 1,
A hydraulic excavator wherein at least the pair of link plates and the guide rib are integrally formed by casting. The hydraulic excavator according to claim 1,
A hydraulic excavator, wherein the guide ribs extend from the cylinder-side boss portion and the arm-side boss portion, and each tip extends toward two opposing sides of the link plate. The hydraulic excavator according to any one of claims 1 to 3,
A hydraulic excavator, wherein a guide rib extending from the arm-side boss is longer than a guide rib extending from the cylinder-side boss. The hydraulic excavator according to any one of claims 1 to 4,
A surface of the guide rib extending from the arm-side boss portion, which comes into contact with the hydraulic hose or the electric cable, is curved so as to bulge along the curved hydraulic hose or the electric cable,
A hydraulic shovel, wherein a surface of the guide rib extending from the cylinder-side boss portion, which comes into contact with the hydraulic hose or the electric cable, is curved so as to be concave along the curved hydraulic hose or the electric cable.

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