JP2023131835A - Protector and work machine - Google Patents

Abstract

To prevent a load from being given from the external to a cylinder of a work machine.SOLUTION: A protector 100 protects a cylinder of a work machine which is rockably mounted on a support part and a work tool mounted on the support part so as to freely rock for performing telescopic motion to make the work tool rock relative to the support part. The protector 100 is mounted on either the support part or the cylinder. On the protector 100, a protrusion part 50 is provided in a space between the cylinder and the support part which approach/separate from each other with the telescopic motion of the cylinder while protruding from one of the support part and the cylinder on which the protector 100 is mounted to the other.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to protective equipment and working machines.

Patent Document 1 discloses a hydraulic excavator that includes a running section, a swinging section that is rotatably provided above the running section, and an excavating section that is provided at the front center of the swinging section. The excavation unit includes a boom, an arm swingably attached to the tip of the boom, and a bucket swingably attached to the tip of the arm for excavating earth and sand. The excavation unit also includes a boom cylinder that rotates the boom up and down, an arm cylinder that rotates the arm up and down, and a bucket cylinder that rotates the bucket.

Japanese Patent Application Publication No. 2015-224875

In the excavator described in Patent Document 1, when the bucket cylinder expands and contracts, a link mechanism provided between the bucket cylinder and the bucket is rotationally driven, and the bucket is rotationally driven. At this time, the bucket cylinder approaches the arm, and the gap between the bucket cylinder and the arm becomes smaller. Therefore, when the bucket cylinder expands and contracts and the bucket cylinder approaches the arm, there is a possibility that stones, wood, etc. will be caught between the bucket cylinder and the arm. This may cause external loads to be applied to the bucket cylinder.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent external loads from being applied to cylinders included in working machines.

The present invention protects a cylinder of a working machine that is swingably attached to a support part and a work tool swingably attached to the support part and expands and contracts to swing the work tool relative to the support part. The protective equipment is attached to either the support part or the cylinder, and the protective equipment includes a protective equipment that is installed in the gap between the cylinder and the support part that approaches and separates as the cylinder expands and contracts. The protective device is provided with a protruding portion that protrudes from one of the supporting portion and the cylinder to which the protective equipment is attached toward the other of the supporting portion and the cylinder.

In this invention, a protector is provided on either the support portion or the cylinder, and the protruding portion of the protector protrudes toward the other. As a result, when the cylinder approaches the support part when swinging the working tool, the protrusion scrapes out foreign objects such as stones and wood between the cylinder and the support part. Therefore, foreign matter is prevented from being caught between the cylinder and the support portion.

The present invention is characterized in that the dimension of the protrusion in a direction perpendicular to both the protrusion direction of the protrusion and the axial direction of the cylinder becomes smaller as it goes toward the other side of the support part and the cylinder.

In this invention, the protrusion protrudes toward the other side, and the dimension in the direction perpendicular to both the protrusion direction and the axial direction of the cylinder decreases as the protrusion portion protrudes toward the other side. Therefore, foreign matter between the cylinder and the support part is more easily scraped out by the protruding part.

The present invention is characterized in that the protruding portion has an elastic portion that can elastically contact the other of the support portion and the cylinder.

In this invention, the elastic part contacts the other of the support part or the cylinder and is elastically deformed, thereby scraping out foreign matter adhering to the other surface. Furthermore, the elastic portion reduces the impact when the protrusion comes into contact with the other.

The present invention is characterized in that the protruding portion is removably provided on one of the support portion and the cylinder.

In this invention, even if the protruding portion wears out, it can be easily replaced.

The present invention is a working machine provided with the above-mentioned protective equipment, wherein the working machine is a shovel having a bucket as a working tool and an arm as a support part, and the shovel has a bucket and a cylinder connected to each other. The cylinder further includes a link mechanism that is rotationally driven together with the bucket by the expansion and contraction movement of the cylinder, and the cylinder includes a cylinder tube and a piston rod extending from the cylinder tube, and the cylinder tube is rotatably connected to the link mechanism. It is characterized by being

In this invention, the cylinder tube is connected to the link mechanism, and the link mechanism and the bucket are rotationally driven by the expansion and contraction movement of the cylinder. Therefore, in the cylinder, the cylinder tube connected to the rotationally driven link mechanism moves more than the piston rod. Therefore, in the cylinder tube, foreign objects are likely to get caught between the cylinder tube and the support part, and furthermore, since the cylinder tube has a larger diameter than the piston rod, the gap between the cylinder tube and the support part is small and it is easy for foreign objects to get caught between the cylinder tube and the support part. However, even in the excavator having such a configuration, the protruding portion prevents foreign matter from being caught between the cylinder tube and the support portion.

According to the present invention, it is possible to prevent external loads from being applied to a cylinder included in a working machine.

1 is a schematic diagram showing a hydraulic excavator equipped with a protective device according to an embodiment of the present invention. 1 is a side view showing a part of a hydraulic excavator provided with a protective device according to an embodiment of the present invention. 1 is a perspective view of a protective device according to an embodiment of the present invention, showing a state in which it is attached to a cylinder. 1 is a perspective view of a protective device according to an embodiment of the present invention, showing a state before being attached to a cylinder.

A protective device according to an embodiment of the present invention will be described with reference to the drawings. Protective equipment is provided on working machines such as construction machines, agricultural machines, and industrial machines that are equipped with running gear. In the following, a protective device 100 provided in a crawler-type hydraulic excavator 1 as a working machine will be described as an example. Although an example will be described in which hydraulic oil is used as the working fluid to drive the actuator of the hydraulic excavator 1, other fluids such as working water may be used as the working fluid.

As shown in FIG. 1, the hydraulic excavator 1 includes a crawler-type running section 2, a swinging section 3 that is rotatably provided on the top of the running section 2, and an excavating section 10 that is provided at the front center of the swinging section 3. , is provided. The rotating section 3 is provided with a cabin 3a in which a worker rides. The traveling section 2, the swing section 3, and the excavating section 10 are driven by hydraulic fluid discharged from a hydraulic pump (not shown) driven by an engine (not shown).

The traveling section 2 causes the hydraulic excavator 1 to travel by driving a pair of left and right crawlers 2a using a traveling motor (not shown). The turning section 3 is driven by a turning motor (not shown), and turns in the left-right direction with respect to the traveling section 2 .

The excavation section 10 will be explained with reference to FIGS. 1 and 2. The excavation unit 10 includes a bucket 11 as a working tool for excavating earth and sand, an arm 12 as a support unit to which the bucket 11 is swingably attached to its tip, and a bucket cylinder that is attached to the arm 12 and swings the bucket 11. 13, a link mechanism 20 that connects the bucket 11 and the bucket cylinder 13, and a boom 14 that has an arm 12 attached to its tip and is attached to be swingable around a horizontal axis extending in the left-right direction of the swing section 3 (see FIG. 1). , an arm cylinder 15 (see FIG. 1) which is attached between the boom 14 and the arm 12 and which makes the arm 12 swing; and a boom cylinder 16 which is attached between the swing section 3 and the boom 14 and which makes the boom 14 swing. (See FIG. 1).

As shown in FIG. 2, the arm 12 has a base 12a to which the bucket cylinder 13 is attached, and an extension 12b extending from the base 12a and having the bucket 11 attached to its tip. At the distal end of the extending portion 12b, the bucket 11 is swingably attached by a connecting pin 18, and the link mechanism 20 is swingably attached by the connecting pin 18 and a first pin 25, which will be described later. The bucket cylinder 13 has a cylinder tube 13a and a piston rod 13b extending from the cylinder tube 13a.The piston rod 13b is swingably attached to the base 12a of the arm 12 by a connecting pin 19, and is swingably (rotatably) connected to the link mechanism 20. Thereby, the bucket cylinder 13 is provided extending in line with the extension portion 12b. The bucket cylinder 13 is aligned with the extension part 12b in a direction perpendicular to the axial direction, and is provided further away from the cabin 3a than the extension part 12b. The extending portion 12b is provided such that the surface facing the bucket cylinder 13 is inclined so that the dimension in the direction adjacent to the bucket cylinder 13 (the left-right direction in FIG. 2) decreases toward the tip. Note that the configurations of the boom 14, the arm cylinder 15, and the boom cylinder 16 can be configured using known configurations, so detailed descriptions thereof will be omitted.

The link mechanism 20 is formed in a substantially U-shape and is provided between the bucket 11, the arm 12, and the bucket cylinder 13. The link mechanism 20 includes a first link part 21 that is provided between the extending part 12b of the arm 12 and the cylinder tube 13a of the bucket cylinder 13 and connects them, and a first link part 21 that is provided between the cylinder tube 13a and the bucket 11 and connects both of them. and a third link part 23 provided between the second link part 22 and the connecting pin 18 that connects the bucket 11 and the arm 12. The third link portion 23 is connected to two locations on the bucket 11.

An end of the first link portion 21 on the extending portion 12b side of the arm 12 is swingably connected to the extending portion 12b by a first pin 25. An end portion of the first link portion 21 on the cylinder tube 13a side of the bucket cylinder 13 is swingably connected to the cylinder tube 13a by a second pin 26 together with an end portion of the second link portion 22 on the cylinder tube 13a side. Therefore, when the bucket cylinder 13 expands and contracts, the first link portion 21 is driven to rotate about the first pin 25 as a fulcrum. Further, the end of the second link portion 22 on the bucket 11 side is swingably connected to the bucket 11 by a third pin 27 together with one end of the third link portion 23 . Therefore, the second link portion 22 follows the expansion and contraction of the bucket cylinder 13. Further, the other end of the third link portion 23 is swingably connected to the bucket 11 by a connecting pin 18. Therefore, when the bucket cylinder 13 expands and contracts, the third link portion 23 is driven to rotate about the connecting pin 18 as a fulcrum.

In such an excavation section 10, when the bucket cylinder 13 extends from the state shown in FIG. 1, the second pin 26 connected to the cylinder tube 13a of the bucket cylinder 13 moves downward (in other words, toward the bucket 11 side) in FIG. Displace. Then, the first link part 21 is rotated counterclockwise in FIG. 2 using the first pin 25 connected to the extension part 12b of the arm 12 as a fulcrum. Further, due to the expansion of the bucket cylinder 13, the third pin 27 is also displaced downward in FIG. 2 via the second link portion 22. Then, the third link part 23 is rotated counterclockwise in FIG. 2 using the connecting pin 18 connected to the bucket 11 and the extension part 12b as a fulcrum. As a result, the bucket 11 is rotated counterclockwise in FIG. 2 using the connecting pin 18 as a fulcrum.

On the contrary, when the bucket cylinder 13 contracts from the state shown in FIG. 2, the second pin 26 is displaced upward in FIG. is rotated clockwise in FIG. Furthermore, due to the contraction of the bucket cylinder 13, the third pin 27 is also displaced upward in FIG. 2 via the second link part 22, and the third link part 23 is driven to rotate clockwise in FIG. 2 with the connecting pin 18 as a fulcrum. be done. As a result, the bucket 11 is rotated clockwise in FIG. 2 using the connecting pin 18 as a fulcrum.

In this manner, the bucket cylinder 13 swings (rotates) the bucket 11 and the link mechanism 20 with respect to the arm 12 by extending the bucket cylinder 13 .

The protective equipment 100 provided in the hydraulic excavator 1 will be described with reference to FIGS. 3 and 4. In this embodiment, the protective equipment 100 is attached to the cylinder tube 13a of the bucket cylinder 13.

The protective equipment 100 includes a protruding portion 50 that protrudes toward the arm 12 (specifically, the extending portion 12b), and a mounting portion 60 for attaching the protruding portion 50 to the cylinder tube 13a of the bucket cylinder 13. . The attachment portion 60 is provided so as to cover substantially the entire cylinder tube 13a.

The protrusion 50 is provided to extend in the axial direction of the bucket cylinder 13. The protruding portion 50 is provided between the extending portion 12b of the arm 12 and the cylinder tube 13a of the bucket cylinder 13, and extends in a direction perpendicular to both the protruding direction and the axial direction of the bucket cylinder 13 toward the extending portion 12b. It is formed so that the dimension (the dimension in the depth direction in FIG. 1) is small. Here, "the protruding direction of the protruding portion 50" is a direction perpendicular to both the axial direction of the bucket cylinder 13 and the connecting pin 18, which is the central axis of rotation of the bucket 11. In other words, "the protruding direction of the protruding portion 50" is a direction in which the bucket cylinder 13 is aligned with the extending portion 12b in a direction perpendicular to the axial direction. In this embodiment, the protrusion 50 is formed to have a triangular shape in a cross section perpendicular to the axis of the bucket cylinder 13. Furthermore, the protruding portion 50 has an elastic portion 50a that can elastically come into contact with the extending portion 12b. In this embodiment, the entire protruding portion 50 is an elastic portion 50a made of, for example, rubber.

The attachment portion 60 is made of a material harder than the protruding portion 50, such as metal or resin. The attachment part 60 has a first semicircular part 61 and a second semicircular part 62 that are formed to cover the cylinder tube 13a. The inner diameters of the first semicircular portion 61 and the second semicircular portion 62 are approximately the same as the outer diameter of the cylinder tube 13a. The first semicircular part 61 and the second semicircular part 62 have flange parts 61a and 62a, respectively, and the flange parts 61a and 62a face each other. The attachment part 60 is attached to the cylinder tube 13a by fixing the flange parts 61a and 62a to each other with bolts 65 and nuts 66 (see FIG. 4). The first semicircular portion 61 includes a mounting surface 61b to which the protrusion 50 is attached, and a position defining portion 61d provided at one end in the axial direction and protruding from the mounting surface 61b to define the position of the protrusion 50. have Furthermore, the protruding portion 50 has a mounting surface 50b that is attached to the first semicircular portion 61. As shown in FIG. 4, the mounting surface 61b of the first semicircular portion 61 and the mounting surface 50b of the protruding portion 50 are formed in an uneven shape (specifically, a T-shape) extending in the axial direction and fit into each other. Fitting portions 61c and 50c are provided on the entirety of each surface.

To attach the protruding part 50 to the first semicircular part 61, from the opening of the fitting part 61c at the other axial end of the first semicircular part 61 (the end opposite to the position defining part 61d). The mounting surface 50b of the protruding portion 50 is inserted, the mounting surface 61b of the first semicircular portion 61 is fitted, and the protruding portion 50 is slid until it abuts the position defining portion 61d. This prevents the protruding portion 50 from falling off in the radial direction of the first semicircular portion 61. Then, the plate 67 is fixed to the first semicircular part 61 with a bolt 68 at the end of the protruding part 50 opposite to the position defining part 61d, and the protruding part 50 is fitted on the opposite side to the position defining part 61d. Prevent it from falling off from the fitting part 61c through the opening of the part 61c. Thereby, the protruding portion 50 is attached to the first semicircular portion 61. Note that the first semicircular portion 61 is not provided with the position defining portion 61d, and the plate 67 is fixed to the first semicircular portion 61 with bolts 68 at both ends of the protruding portion 50 to prevent the protruding portion 50 from falling off. You may.

Here, in the hydraulic excavator 1, as described above, when the bucket cylinder 13 expands and contracts, the first link portion 21 connected to the cylinder tube 13a of the bucket cylinder 13 is rotationally driven, and the bucket 11 is rotationally driven. At this time, since the second pin 26 connected to the cylinder tube 13a approaches and separates from the extension part 12b of the arm 12, the cylinder tube 13a approaches and extends from the extension part 12b of the arm 12. It separates from the portion 12b. When the cylinder tube 13a approaches the extended portion 12b, the gap between the cylinder tube 13a and the extended portion 12b becomes smaller. If the hydraulic excavator 1 is not equipped with the protective equipment 100, if the gap between the cylinder tube 13a and the extension part 12b becomes smaller due to the expansion and contraction of the bucket cylinder 13, stones, wood, etc. may be caught, and the bucket cylinder 13 may be exposed to external objects. There is a risk that a load will be applied.

However, in the present embodiment, the hydraulic excavator 1 is provided with a protective device 100 on the cylinder tube 13a of the bucket cylinder 13, and the protruding portion 50 of the protective device 100 protrudes toward the extending portion 12b of the arm 12 and extends. The dimension in the direction perpendicular to both the protrusion direction and the axial direction of the bucket cylinder 13 decreases toward the portion 12b. As a result, when the cylinder tube 13a approaches the extension part 12b when swinging the bucket 11, the inclination of the protrusion 50 scrapes out foreign objects such as stones and wood between the cylinder tube 13a and the extension part 12b. It will be done. Therefore, foreign matter is prevented from being caught between the cylinder tube 13a and the extension portion 12b.

Moreover, since the protruding part 50 has an elastic part 50a that can elastically contact the extending part 12b of the arm 12, when the elastic part 50a contacts the extending part 12b, it is elastically deformed so as to spread from the contact surface. As a result, foreign matter adhering to the surface of the extending portion 12b is scraped out, and foreign matter is further prevented from being caught between the cylinder tube 13a and the extending portion 12b. Furthermore, even if the protruding part 50 contacts the extending part 12b, the elastic part 50a can reduce the impact caused by the contact, and the bucket cylinder 13 can be protected. In other words, since the protruding part 50 has the elastic part 50a, the bucket cylinder 13 can be protected even when the protruding part 50 contacts the extension part 12b. 1 can be applied.

Furthermore, in the protective equipment 100, the protrusion 50 for scraping out foreign matter wears out faster than the attachment part 60 for attaching the protrusion 50 to the cylinder tube 13a. However, the protrusion 50 is removably attached to the cylinder tube 13a of the bucket cylinder 13 via the attachment part 60. Therefore, in the protective equipment 100, even if the protrusion 50 is worn out, only the protrusion 50 can be easily replaced.

Further, in the hydraulic excavator 1, the cylinder tube 13a of the bucket cylinder 13 is rotatably connected to the link mechanism 20, and the link mechanism 20 and the bucket 11 are rotationally driven by the expansion and contraction movement of the bucket cylinder 13. Therefore, in the bucket cylinder 13, the cylinder tube 13a connected to the rotationally driven link mechanism 20 moves more than the piston rod 13b. Therefore, in the cylinder tube 13a, foreign objects are likely to get caught between the cylinder tube 13a and the extended portion 12b of the arm 12, and furthermore, since the cylinder tube 13a has a larger diameter than the piston rod 13b, the distance between the cylinder tube 13a and the extended portion 12b is small, making it easy for foreign objects to get caught. However, even in the hydraulic excavator 1 having such a configuration, the protruding portion 50 prevents foreign matter from being caught between the cylinder tube 13a and the extending portion 12b.

Note that the protruding portion 50 may be formed to have a semicircular shape in a cross section along the radial direction of the bucket cylinder 13. In this case as well, the protruding portion 50 is formed such that the dimension in the direction perpendicular to both the protruding direction and the axial direction of the bucket cylinder 13 becomes smaller toward the extending portion 12b of the arm 12. Further, a configuration may be adopted in which the protrusion portion 50 does not contact the extension portion 12b. As long as the protruding part 50 does not contact the extending part 12b, the protruding part 50 may be formed of metal, resin, or the like instead of the elastic part 50a.

Further, the protruding part 50 is formed so that the dimension in the direction perpendicular to both the protruding direction and the axial direction of the bucket cylinder 13 becomes smaller as it goes toward the extending part 12b of the arm 12, so that Foreign matter between the extended portion 12b of 12 and the extended portion 12b is more easily scraped out. However, although it becomes difficult for foreign matter to be scraped out, the protruding part 50 is formed so that the dimension in the direction perpendicular to both the protruding direction and the axial direction of the bucket cylinder 13 becomes smaller toward the extending part 12b of the arm 12. You don't have to. For example, the protruding portion 50 may be configured to protrude toward the extending portion 12b of the arm 12 so that the dimensions in the direction perpendicular to both the protruding direction and the axial direction of the bucket cylinder 13 are uniform. Even with this configuration, foreign matter between the cylinder tube 13a and the extended portion 12b is scraped out by the protruding portion 50, and foreign matter is prevented from being caught between the cylinder tube 13a and the extended portion 12b. .

According to the embodiment described above, the following effects are achieved.

In the hydraulic excavator 1, the protrusion 50 of the protector 100 provided on the cylinder tube 13a of the bucket cylinder 13 scrapes out foreign objects such as stones and wood between the cylinder tube 13a and the extending portion 12b of the arm 12. Therefore, foreign matter is prevented from being caught between the cylinder tube 13a and the extension portion 12b.

Since the protruding portion 50 has an elastic portion 50a that can elastically come into contact with the extending portion 12b of the arm 12, it is possible to further prevent foreign matter from being caught between the cylinder tube 13a and the extending portion 12b. The impact when the protruding portion 50 contacts the extended portion 12b is alleviated.

Since the protruding part 50 is removably provided on the cylinder tube 13a of the bucket cylinder 13 via the attachment part 60, in the protective equipment 100, even if the protruding part 50 wears out, only the protruding part 50 can be easily replaced. can.

In the hydraulic excavator 1, the cylinder tube 13a of the bucket cylinder 13 is rotatably connected to the link mechanism 20. Therefore, although the distance between the cylinder tube 13a and the extension part 12b of the arm 12 is small and foreign objects are likely to be caught, the protrusion 50 prevents foreign objects from being caught between the cylinder tube 13a and the extension part 12b. .

The following modifications are also within the scope of the present invention, and the configurations shown in the modifications may be combined with the configurations described in the above-described embodiments, the configurations described in the different embodiments described above may be combined, or the following different embodiments may be used. It is also possible to combine the configurations described in the modified examples.

<Modification 1>
In the embodiment described above, the protective equipment 100 is provided in the cylinder tube 13a of the bucket cylinder 13. The present invention is not limited to this, and the protective equipment 100 may be provided on the arm 12 (specifically, the extension portion 12b). In this case, the protective equipment 100 includes a protrusion 50 that protrudes toward the bucket cylinder 13 , the protrusion 50 is provided between the arm 12 and the bucket cylinder 13 , and the protrusion 50 extends toward the bucket cylinder 13 . The dimension in the direction perpendicular to both the projecting direction of the bucket cylinder 13 and the axial direction of the bucket cylinder 13 may be reduced. The protruding portion 50 is attached to the arm 12 with the same configuration as the attaching portion 60. Even with such a configuration, the same effects as in the above embodiment can be achieved.

Furthermore, the protective equipment 100 may be provided on either the boom 14 or the boom cylinder 16. In this case, the protective equipment 100 includes a protrusion 50 that protrudes toward the other of the boom 14 or the boom cylinder 16, and the protrusion 50 is provided between the boom 14 or the boom cylinder 16, and the protrusion 50 is provided between the boom 14 or the boom cylinder 16. It is sufficient that the dimension in the direction perpendicular to both the protruding direction of the protruding portion 50 and the axial direction of the boom cylinder 16 decreases toward the other side of the cylinder 16 . Further, the protruding portion 50 is attached to the boom 14 or the boom cylinder 16 with the same configuration as the attaching portion 60. Even with such a configuration, the same effects as in the above embodiment can be achieved.

<Modification 2>
In the embodiment described above, the protective equipment 100 is provided in the hydraulic excavator 1. The present invention is not limited to this, and the protective equipment 100 may be provided in other working machines, for example, a wheel loader. In this case, the protective equipment 100 includes an arm to which a bucket for excavating earth and sand etc. is swingably attached, and a cylinder which is attached to the arm and swings the bucket by approaching and moving away from the arm through telescopic action. It suffices if it is provided on either one. Even with such a configuration, the same effects as in the above embodiment can be achieved. In this way, the protective equipment 100 can be applied to a working machine in which a working tool swingably attached to a support part rotates due to the expansion and contraction movement of the cylinder, and the cylinder and the support part approach and separate from each other.

<Modification 3>
In the embodiment described above, the cylinder tube 13a of the bucket cylinder 13 is rotatably connected to the link mechanism 20. The present invention is not limited to this, and the piston rod 13b of the bucket cylinder 13 may be rotatably connected to the link mechanism 20. In this case, the cylinder tube 13a is attached to the base 12a of the arm 12. Even with such a configuration, the same effects as in the above embodiment can be achieved.

<Modification 4>
In the embodiment described above, the protruding portion 50 is attached to the cylinder tube 13a of the bucket cylinder 13 by fitting into the first semicircular portion 61 of the attaching portion 60. However, the present invention is not limited to this, and the protruding part 50 may be attached to the cylinder tube 13a by a plurality of band-shaped band members attached to the outer peripheral surface of the cylinder tube 13a instead of the attaching part 60. In this case, the band member and the protrusion 50 may be fixed with bolts, adhesive, or the like. Even with such a configuration, the same effects as in the above embodiment can be achieved.

The configuration, operation, and effects of the embodiment of the present invention configured as described above will be collectively described.

By being swingably attached to the support part (arm 12, boom 14, arm of the wheel loader) and a work tool (bucket 11, wheel loader bucket) swingably attached to the support part, and expanding and contracting. Protective equipment 100 that protects cylinders (bucket cylinder 13, boom cylinder 16, cylinder of wheel loader) of a working machine (hydraulic excavator 1, wheel loader) that swings a working tool relative to a support part, the protective equipment 100 is attached to either the support part or the cylinder, and the protector 100 is provided in the gap between the cylinder and the support part, which approach and move away as the cylinder expands and contracts. A protruding portion 50 is provided that protrudes from one of the supporting portion and the cylinder toward the other of the supporting portion and the cylinder.

In this configuration, the protector 100 is provided on either the support portion or the cylinder, and the protruding portion 50 of the protector 100 protrudes toward the other. As a result, when the cylinder approaches the support part when swinging the working tool, the protrusion 50 scrapes out foreign objects such as stones and wood between the cylinder and the support part. Therefore, foreign matter is prevented from being caught between the cylinder and the support portion.

In the protective equipment 100, the protrusion 50 protrudes toward the other of the support section (arm 12, boom 14, wheel loader arm) and the cylinder (bucket cylinder 13, boom cylinder 16, wheel loader cylinder). The dimensions perpendicular to both the direction and the axial direction of the cylinder are reduced.

In this configuration, the protruding portion 50 protrudes toward the other side, and the dimension in the direction perpendicular to both the protruding direction and the axial direction of the cylinder decreases as the protruding portion 50 protrudes toward the other side. Therefore, foreign matter between the cylinder and the support part is more easily scraped out by the protruding part 50.

The protective equipment 100 has an elastic structure that allows the protruding portion 50 to elastically contact the other of the support portions (arm 12, boom 14, wheel loader arm) or cylinders (bucket cylinder 13, boom cylinder 16, wheel loader cylinder). It has a section 50a.

In this configuration, the elastic portion 50a contacts the other of the support portion or the cylinder and is elastically deformed, thereby scraping out foreign matter adhering to the other surface. Furthermore, the elastic portion 50a reduces the impact when the protruding portion 50 contacts the other.

In the protective equipment 100, the protruding part 50 is removably provided on one of the support part (arm 12, boom 14, wheel loader arm) or the cylinder (bucket cylinder 13, boom cylinder 16, wheel loader cylinder).

With this configuration, even if the protrusion 50 wears out, it can be easily replaced.

A working machine provided with the protective equipment 100 is a hydraulic excavator 1 having a bucket 11 as a working tool and an arm 12 as a support part. The bucket cylinder 13 further includes a link mechanism 20 that is rotationally driven together with the bucket 11 by the expansion and contraction movement of the cylinder 13, and the bucket cylinder 13 has a cylinder tube 13a and a piston rod 13b extending from the cylinder tube 13a. is rotatably connected to the link mechanism 20.

In this configuration, the cylinder tube 13a is connected to the link mechanism 20, and the link mechanism 20 and the bucket 11 are rotationally driven by the expansion and contraction movement of the bucket cylinder 13. Therefore, in the bucket cylinder 13, the cylinder tube 13a connected to the rotationally driven link mechanism 20 moves more than the piston rod 13b. Therefore, in the cylinder tube 13a, foreign objects are likely to get caught between the cylinder tube 13a and the arm 12, and furthermore, since the cylinder tube 13a has a larger diameter than the piston rod 13b, the gap between the cylinder tube 13a and the arm 12 is small, making it easy for foreign objects to get caught. However, even in the hydraulic excavator 1 having such a configuration, the protruding portion 50 prevents foreign matter from being caught between the cylinder tube 13a and the arm 12.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. do not have.

DESCRIPTION OF SYMBOLS 1... Hydraulic excavator (work machine), 100... Protective equipment, 11... Bucket (work tool), 12... Arm (support part), 13... Bucket cylinder (cylinder), 13a. ...Cylinder tube, 13b...Cylinder rod, 20...Link mechanism, 50...Protrusion part, 50a...Elastic part

Claims (5)

Protection for protecting a cylinder of a working machine that is swingably attached to a support part and a work tool swingably attached to the support part and expands and contracts to swing the work tool with respect to the support part. A tool,
The protective equipment is attached to either the support part or the cylinder,
The protective device is provided in a gap between the cylinder and the supporting portion that approach and separate as the cylinder expands and contracts, and the protective device is provided in a gap between the supporting portion and the cylinder to which the protective device is attached. and a protective device, further comprising a protrusion that protrudes toward the other side of the cylinder. The protective equipment according to claim 1,
The protective device is characterized in that the size of the protruding portion in a direction perpendicular to both the protruding direction of the protruding portion and the axial direction of the cylinder decreases toward the other of the supporting portion and the cylinder. The protective equipment according to claim 1 or 2,
The protective device, wherein the protruding portion has an elastic portion that can elastically contact the support portion and the other of the cylinders. The protective equipment according to any one of claims 1 to 3,
The protective device is characterized in that the protruding portion is removably provided on the one of the supporting portion and the cylinder. A working machine provided with the protective equipment according to any one of claims 1 to 4,
The working machine is a shovel having a bucket as the working tool and an arm as the supporting part,
The shovel further includes a link mechanism that connects the bucket and the cylinder and is rotationally driven together with the bucket by the expansion and contraction movement of the cylinder,
The cylinder has a cylinder tube and a piston rod extending from the cylinder tube,
A working machine, wherein the cylinder tube is rotatably connected to the link mechanism.

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