Work machine and cylinder cover

Abstract

To provide a work machine provided with a cylinder cover that can prevent generation of wear and noise caused by manufacturing errors and installation errors.SOLUTION: A work machine comprises: a vehicle body; a work device that is supported by the vehicle body to operate; a hydraulic cylinder that rotates the connected work device by a cylinder rod extending and contracting with respect to a cylinder tube; and a cylinder cover protecting the hydraulic cylinder. The cylinder cover (10) includes: a first cover (11) attached to the cylinder rod; a second cover (12) guided by a guide member attached to the cylinder tube and capable of sliding in a direction of expansion and contraction of the cylinder rod; and a connecting member (13) rotatably connecting the first cover (11) and the second cover (12) around a rotation axis extending in the expansion / contraction direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work machine equipped with a hydraulic cylinder and a cylinder cover for protecting the hydraulic cylinder. [Background technology]

[0002] Conventionally, there has been known a work machine that includes a vehicle body, a working device that operates while supported by the vehicle body, and a hydraulic cylinder that raises and lowers the working device. In such a work machine, a cylinder cover is sometimes attached to prevent the hydraulic cylinder from colliding with other members and being damaged (see, for example, Patent Document 1).

[0003] The cylinder cover described in Patent Document 1 has one end fixed to the cylinder rod and the other end guided by a guide member attached to the cylinder tube, so that it can slide in the extension / contraction direction of the cylinder rod. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 2509189 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the configuration of the cylinder cover described in Patent Document 1 has the problem that if there are manufacturing or assembly errors in the parts, an unbalanced load will be applied to the sliding contact portion between the cylinder cover and the guide member, causing wear and noise.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a work machine and a cylinder cover that are equipped with a cylinder cover that can prevent wear and noise caused by manufacturing errors and installation errors. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a working machine comprising a vehicle body, a working device that is supported by the vehicle body and operates, a hydraulic cylinder that rotates the connected working device by extending and retracting a cylinder rod relative to a cylinder tube, and a cylinder cover that protects the hydraulic cylinder, wherein the cylinder cover comprises a first cover attached to the cylinder rod, a second cover that is guided by a guide member attached to the cylinder tube and is slidable in the direction of extension and retraction of the cylinder rod, and a cylinder cover that is attached to the first cover and The second cover In connection with and a connecting member that connects the The second cover is connected to the first cover by the connecting member so as to be rotatable about a rotation axis extending in the extension / contraction direction of the cylinder rod. It is characterized by: [Effects of the Invention]

[0008] According to the present invention, it is possible to obtain a work machine and a cylinder cover that are equipped with a cylinder cover that prevents wear and noise caused by manufacturing errors and installation errors. Note that problems, configurations, and effects other than those described above will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a hydraulic excavator. [Figure 2] FIG. 2 is a view showing a cylinder cover according to the first embodiment. [Figure 3] 10A and 10B are a perspective view and a side view of the cylinder cover when the boom cylinder is extended. [Figure 4] 10A and 10B are a perspective view and a side view of the cylinder cover when the boom cylinder is retracted. [Figure 5] FIG. 10 is a view showing a cylinder cover according to a second embodiment. [Figure 6] FIG. 10 is a view showing a cylinder cover according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [First embodiment] An embodiment of a hydraulic excavator 1 (work machine) according to the present invention will be described with reference to the drawings. Specific examples of the work machine are not limited to the hydraulic excavator 1, and may include a wheel loader, a crane, a dump truck, etc. Furthermore, unless otherwise specified, the terms front, back, left, and right in this specification are based on the viewpoint of an operator who is on board and operating the hydraulic excavator 1.

[0011] Fig. 1 is a perspective view of a hydraulic excavator 1. As shown in Fig. 1, the hydraulic excavator 1 includes a lower traveling body 2 and an upper rotating body 3 supported by the lower traveling body 2. The lower traveling body 2 and the upper rotating body 3 are an example of a vehicle body.

[0012] The lower traveling body 2 is equipped with a pair of left and right crawlers. When the rotation of a traveling motor (not shown) is transmitted to the pair of left and right crawlers to rotate, the hydraulic excavator 1 travels. However, the lower traveling body 2 may be of a wheeled type instead of a crawler type. Also, a soil removal blade 8 is attached to the front end of the lower traveling body 2. The soil removal blade 8 is another example of a working device that rotates (raises and lowers) by the extension and contraction of a soil removal cylinder (not shown).

[0013] The upper rotating body 3 is supported on the lower traveling body 2 so as to be rotatable by a rotating motor (not shown). The upper rotating body 3 mainly comprises a rotating frame 5 serving as a base, a front working machine 4 (working device) attached to the front center of the rotating frame 5 so as to be rotatable in the vertical direction, a cab (operator's seat) 7 disposed in the center of the rotating frame 5, and a counterweight 6 disposed at the rear of the rotating frame 5.

[0014] The front working implement 4 includes a boom 4a rotatably (raising and lowering) supported on the upper rotating body 3, an arm 4b rotatably supported at the tip of the boom 4a, a bucket 4c rotatably supported at the tip of the arm 4b, a boom cylinder 4d that drives the boom 4a, an arm cylinder 4e that drives the arm 4b, and a bucket cylinder 4f that drives the bucket 4c. The counterweight 6 is used to balance the weight of the front working implement 4, and is a heavy object that has an arc shape when viewed from above.

[0015] One end (cylinder tube 23 in FIG. 3) of the boom cylinder 4d is rotatably connected to the upper rotating body 3, and the other end (cylinder rod 24 in FIG. 3) is rotatably connected to the boom 4a. The boom 4a rotates (raises and lowers) relative to the upper rotating body 3 as the cylinder rod 24 extends and contracts relative to the cylinder tube 23.

[0016] More specifically, the boom cylinder 4d has a cylinder tube 23 and a cylinder rod 24. The base end of the cylinder tube 23 is rotatably connected to the upper rotating body 3, and an opening (hereinafter referred to as the "tip opening") is formed at the tip. The cylinder rod 24 is inserted into the cylinder tube 23 through the tip opening. The cylinder rod 24 is configured to be movable in the extension / retraction direction by supplying and discharging hydraulic oil to and from the cylinder tube 23.

[0017] One end of the arm cylinder 4e is rotatably connected to the boom 4a, and the other end is rotatably connected to the arm 4b. When the arm cylinder 4e extends or retracts, the arm 4b rotates relative to the boom 4a. When the bucket cylinder 4f extends or retracts, the bucket 4c rotates relative to the arm 4b.

[0018] The boom cylinder 4d, the arm cylinder 4e, the bucket cylinder 4f, and the earth removal cylinder are examples of hydraulic cylinders that rotate the front working implement 4 by means of hydraulic oil supplied from a hydraulic pump (not shown).

[0019] The cab 7 has an internal space in which an operator who operates the hydraulic excavator 1 sits. A seat on which the operator sits and an operating device operated by the operator seated in the seat are arranged in the internal space of the cab 7. The operating device receives operations from the operator to operate the hydraulic excavator 1. When the operator operates the operating device, the lower traveling body 2 travels, the upper rotating body 3 rotates, and the front working implement 4 operates. Specific examples of the operating device include a lever, a steering wheel, an accelerator pedal, a brake pedal, and a switch.

[0020] A cylinder cover 10 is attached to the boom cylinder 4d. The cylinder cover 10 protects the boom cylinder 4d. More specifically, the cylinder cover 10 is disposed on the opposite side of the boom 4a across the boom cylinder 4d. However, the cylinder cover 10 is not limited to protecting the boom cylinder 4d, and may also protect other hydraulic cylinders (such as the arm cylinder 4e, bucket cylinder 4f, and earth removal cylinder).

[0021] Fig. 2 is a view showing the cylinder cover 10 according to the first embodiment. Fig. 3 is a perspective view and a side view of the cylinder cover 10 when the boom cylinder 4d is extended. Fig. 4 is a perspective view and a side view of the cylinder cover 10 when the boom cylinder 4d is retracted. In Fig. 2, the upper left figure is a view of the cylinder cover 10 as seen from the boom cylinder 4d side, the right figure is a side view of the upper left figure as seen from the arrow A, and the lower left figure is a cross-sectional view taken along line BB in the upper left figure.

[0022] The cylinder cover 10 as a whole has an elongated plate-like outer shape that is long in the extension / retraction direction of the boom cylinder 4d (hereinafter simply referred to as the "extension / retraction direction"). In this specification, of the two directions perpendicular to the extension / retraction direction, the thickness direction of the cylinder cover 10 will be simply referred to as the "thickness direction," and the width direction of the cylinder cover 10 will be simply referred to as the "width direction." As shown in FIG. 2, the cylinder cover 10 mainly includes a first cover 11, a second cover 12, a connecting member 13, and a pair of caps 14a, 14b.

[0023] The first cover 11 is a plate-like member that expands in the extension / contraction direction and the width direction. The first cover 11 is formed of, for example, a metal material. The first cover 11 has through holes 15, 16a, and 16b that penetrate in the thickness direction. The through hole 15 is formed in the center in the width direction at the end opposite the second cover 12 in the extension / contraction direction. The through holes 16a and 16b are formed at positions spaced apart in the width direction at the end on the second cover 12 side in the extension / contraction direction.

[0024] The first cover 11 is attached to the tip of the cylinder rod 24 by, for example, bolts (not shown) inserted into the through holes 15. The "tip of the cylinder rod 24" refers to the part of the cylinder rod 24 that is exposed from the cylinder tube 23 even when the boom cylinder 4d is fully retracted. Note that the method of attaching the first cover 11 to the cylinder rod 24 is not limited to the example described above.

[0025] The second cover 12 is disposed at a position spaced from the first cover 11 toward the cylinder tube 23 in the extension / contraction direction. The second cover 12 is formed, for example, from a metal material. The second cover 12 is configured to be slidable relative to the cylinder tube 23 along a guide member 25 (see FIGS. 3 and 4) attached to the outer surface of the cylinder tube 23. In other words, the guide member 25 is disposed between the second cover 12 and the cylinder tube 23. The second cover 12 is composed of a protective portion 17 and a pair of holding portions 18a, 18b.

[0026] The protective portion 17 is a plate-shaped portion that expands in the telescopic and expansion directions and the width direction. Through holes 19a, 19b are formed in the protective portion 17, penetrating in the thickness direction. The through holes 19a, 19b are arranged at positions spaced apart in the width direction at the end on the first cover 11 side in the telescopic direction. The pair of holding portions 18a, 18b extend in the telescopic direction at both widthwise ends of the protective portion 17. The holding portions 18a, 18b are portions that hold the caps 14a, 14b by folding both widthwise ends of the protective portion 17 toward the boom cylinder 4d.

[0027] The caps 14a, 14b are long rod-shaped members extending in the extension / contraction direction. The caps 14a, 14b are formed, for example, from a resin material. The caps 14a, 14b held in the holding portions 18a, 18b are arranged facing each other in the width direction. The distance between the caps 14a, 14b in the width direction is set to be the same as or slightly larger than the width dimension of the guide member 25. Furthermore, the opposing surfaces of the caps 14a, 14b are exposed from the holding portions 18a, 18b. The second cover 12 is arranged so that the guide member 25 is sandwiched between the caps 14a, 14b.

[0028] The connecting member 13 is, for example, a plate-like member having a rectangular outer shape when viewed from above in the thickness direction. The connecting member 13 is disposed between the first cover 11 and the second cover 12 in the extension / contraction direction. The connecting member 13 is also formed with through holes 20a, 20b, 21a, and 21b penetrating in the thickness direction. The through holes 20a, 20b are formed at an end portion on the first cover 11 side in the extension / contraction direction, spaced apart in the width direction. The through holes 21a, 21b are formed at an end portion on the second cover 12 side in the extension / contraction direction, spaced apart in the width direction.

[0029] The connecting member 13 is overlapped with the first cover 11 so that the through holes 16a, 20a and the through holes 16b, 20b communicate with each other. The connecting member 13 is also overlapped with the second cover 12 so that the through holes 19a, 21a and the through holes 19b, 21b communicate with each other. The first cover 11 and the second cover 12 are connected by the connecting member 13 by threading nuts (not shown) from the opposite side onto bolts 22 inserted into the communicating through holes 16a, 20a, through holes 16b, 20b, through holes 19a, 21a, and through holes 19b, 21b. The connecting member 13 according to the first embodiment is disposed closer to the boom cylinder 4d than the first cover 11 and the second cover 12.

[0030] Note that the specific method of attaching the first cover 11 and the second cover 12 to the connecting member 13 is not limited to the foregoing example. As another example, the first cover 11 and the second cover 12 may be attached to the connecting member 13 by screwing bolts into the inser nuts inserted into some of the through holes 16a, 16b, 19a, 19b, 20a, 20b, 21a, 21b.

[0031] Further, the connecting member 13 is made of an elastic body (for example, resin, rubber, etc.). Thereby, the connecting member 13 rotatably connects the first cover 11 and the second cover 12 about a first virtual line L1 (rotation axis) extending in the expansion and contraction direction through the center in the width direction and the thickness direction of the cylinder cover 10. Also, the connecting member 13 connects the first cover 11 and the second cover 12 so as to be bendable in the thickness direction.

[0032] Furthermore, the dimension in the width direction of the first cover 11 gradually increases from the first dimension W1 to the second dimension W2 (W1 < W2) from the side of the through hole​​​​​​​​

[0035] According to the first embodiment, the first cover 11 and the second cover 12 are connected by the connecting member 13. This prevents an uneven load from being applied to the sliding contact portion between the cylinder cover 10 and the guide member 25, which would cause wear on the caps 14a, 14b and generate noise, even if there are manufacturing or assembly errors in the components that make up the cylinder cover 10. Furthermore, according to the first embodiment, the second cover 12 is bendable in the thickness direction relative to the first cover 11, which further effectively prevents wear and noise.

[0036] Furthermore, according to the first embodiment, by setting the widthwise dimension of the connecting member 13 to the second dimension W2, the load acting on the connecting member 13 can be distributed when the second cover 12 is displaced relative to the first cover 11.

[0037] The specific configuration of the cylinder cover 10 is not limited to the example shown in Fig. 2. Below, a cylinder cover 30 according to a second embodiment will be described with reference to Fig. 5, and a cylinder cover 50 according to a third embodiment will be described with reference to Fig. 6. A detailed description of the commonalities with the first embodiment will be omitted, and the description will focus on the differences.

[0038] [Second embodiment] Figure 5 is a view showing a cylinder cover 30 according to a second embodiment. In Figure 5, the upper left figure shows the cylinder cover 30 as seen from the boom cylinder 4d side, the right figure is a side view of the upper left figure as seen from the arrow C, and the lower left figure is a cross-sectional view taken along line DD in the upper left figure. The cylinder cover 30 according to the second embodiment includes a first cover 31, a second cover 32, a bolt 33a (connecting member), a double nut 33b, and a pair of caps 14a, 14b. The configuration of the caps 14a, 14b is the same as in the first embodiment.

[0039] The first cover 31 is formed of, for example, a metal material. The first cover 31 is composed of a first protective portion 34 and a first flange portion 35. The first protective portion 34 is a flat portion extending in the extension / contraction direction. The first flange portion 35 is a flat portion protruding from the end of the first protective portion 34 on the second cover 32 side to one side in the thickness direction of the first protective portion 34 (the side opposite to the boom cylinder 4d). In other words, the first cover 31 has an L-shaped outer shape when viewed from the side in the width direction as shown in the right diagram of FIG. 5.

[0040] A through hole 36 is formed in the first protective portion 34, penetrating it in the thickness direction. The through hole 36 is formed in the center of the first protective portion 34 in the width direction. The first cover 31 is attached to the tip end of the cylinder rod 24 by a bolt (not shown) or the like that is inserted into the through hole 36. However, the method of attaching the first cover 31 to the cylinder rod 24 is not limited to the example described above.

[0041] A first through-hole 37 is formed in the first flange 35. The first through-hole 37 penetrates the first flange 35 in the extension / contraction direction (thickness direction of the first flange 35) at the center of the first flange 35 in the width direction and the center of the first flange 35 in the protruding direction.

[0042] The second cover 32 is formed of, for example, a metal material. The second cover 32 is composed of a second protective portion 38, a pair of holding portions 39a, 39b, and a second flange portion 40. The configuration of the second protective portion 38 is the same as that of the protective portion 17 according to the first embodiment, except that the end portion on the first cover 31 side is tapered and that the through holes 19a, 19b are omitted. In addition, the configuration of the holding portions 39a, 39b is the same as that of the holding portions 18a, 18b according to the first embodiment.

[0043] The second flange 40 is a flat plate-like portion that protrudes from the end of the second protective portion 38 on the first cover 31 side to one side in the thickness direction of the second protective portion 38 (the side opposite to the boom cylinder 4d, the side opposite to the holding portions 39a and 39b). That is, the second cover 32 has an inverted L-shaped outer shape when viewed from the side in the width direction as shown in the right drawing of FIG. 5. The second flange 40 has a second through-hole 41. The second through-hole 41 penetrates the second flange 40 in the extension / contraction direction (thickness direction of the second flange 40) at the center of the second flange 40 in the width direction and at the center of the second flange 40 in the protruding direction.

[0044] As shown in FIG. 5 , when the first cover 31 and the second cover 32 are viewed from the same side, the first flange 35 and the second flange 40 protrude in the same direction. When the first flange 35 and the second flange 40 are overlapped, the first through hole 37 and the second through hole 41 communicate with each other. Next, a bolt 33a is inserted into the communicated first through hole 37 and the second through hole 41, and a double nut 33b is screwed onto the opposite side, thereby connecting the first cover 31 and the second cover 32 with a predetermined gap (backlash). Note that, in the second embodiment, an example is shown in which the bolt 33a is inserted from the first flange 35 side and the double nut 33b is screwed onto the second flange 40 side, but the arrangement of the bolt 33a and the double nut 33b may be reversed.

[0045] The diameters of the first through hole 37 and the second through hole 41 are set slightly larger than the diameter of the shank of the bolt 33a. A predetermined gap is provided between the opposing surfaces of the first flange 35 and the second flange 40. This allows the bolt 33a and the double nut 33b to rotatably connect the first cover 31 and the second cover 32 about a second imaginary line L2 (rotation axis) that passes through the center of the bolt 33a (in other words, the center of the first through hole 37 and the second through hole 41) and extends in the extension / contraction direction. By further increasing the diameters of the first through hole 37 and the second through hole 41, the bolt 33a and the double nut 33b can connect the first cover 31 and the second cover 32 so that they can bend in the thickness direction.

[0046] The cylinder cover 30 according to the second embodiment can also achieve the same effects as those of the first embodiment. Note that the first cover 31 and the second cover 32 according to the second embodiment may be connected by a pin 53 shown in Fig. 6 instead of the bolt 33a.

[0047] [Third embodiment] FIG. 6 is a diagram showing a cylinder cover 50 according to a third embodiment. In FIG. 6, the upper left diagram is a diagram of the cylinder cover 50 as seen from the boom cylinder 4d side, the right diagram is a side view of the upper left diagram as seen from the arrow E, and the lower left diagram is a cross-sectional view taken along line FF in the upper left diagram. The cylinder cover 50 according to the third embodiment includes a first cover 51, a second cover 52, a pin 53 (connecting member), and a pair of caps 14a, 14b. The configuration of the caps 14a, 14b is the same as in the first embodiment.

[0048] The first cover 51 is made of, for example, a metal material. The first cover 51 is composed of a first protective portion 54 and a first flange portion 55. A through hole 56 is formed in the first protective portion 54. A first through hole 57 is formed in the first flange portion 55. The configuration of the first cover 51 is the same as that of the first cover 31 according to the second embodiment.

[0049] The second cover 52 is formed of, for example, a metal material. The second cover 52 is composed of a second protective portion 58, a pair of holding portions 59a, 59b, and a second flange portion 60. The configuration of the second protective portion 58 is the same as that of the second protective portion 38 according to the second embodiment. In addition, the configuration of the holding portions 59a, 59b is the same as that of the holding portions 39a, 39b according to the second embodiment.

[0050] The second flange 60 is a flat plate-like portion that protrudes from the end of the second protective portion 58 on the first cover 51 side toward the other side in the thickness direction of the second protective portion 58 (toward the boom cylinder 4d and the holding portions 59a, 59b). That is, the second cover 52 has an L-shaped outer shape when viewed from the side in the width direction as shown in the right drawing of FIG. 6. The second flange 60 has a second through hole 61. The second through hole 61 penetrates the second flange 60 in the extension / contraction direction (the thickness direction of the second flange 60) at the center of the second flange 60 in the width direction and at the center of the second flange 60 in the protruding direction.

[0051] 6, when the first cover 51 and the second cover 52 are viewed from the same side, the first flange 55 and the second flange 60 protrude in opposite directions. When the first flange 55 and the second flange 60 are overlapped so as to engage with each other, the first through-hole 57 and the second through-hole 61 communicate with each other. "Overlapping the first flange 55 and the second flange 60 so as to engage with each other" refers to overlapping the first flange 55 and the second flange 60 so as to be positioned closer to the cylinder tube 23 than the second flange 60, for example.

[0052] Next, the pin 53 is inserted through the first through-hole 57 and the second through-hole 61, which are connected to each other, and the retaining pin 53b is attached to the through-hole 53a, thereby connecting the first cover 51 and the second cover 52. Note that, although the third embodiment shows an example in which the pin 53 is inserted from the second flange 60 side and the retaining pin 53b is attached on the first flange 55 side, the arrangement of the pin 53 and the retaining pin 53b may be reversed.

[0053] The diameters of the first through hole 57 and the second through hole 61 are set to be slightly larger than the diameter of the shaft portion of the pin 53. As a result, the pin 53 connects the first cover 51 and the second cover 52 to be rotatable about a third imaginary line L3 (rotation axis) that passes through the center of the pin 53 (in other words, the center of the first through hole 57 and the second through hole 61) and extends in the extension / contraction direction. Furthermore, by further increasing the diameters of the first through hole 57 and the second through hole 61, the pin 53 can connect the first cover 51 and the second cover 32 to be bendable in the thickness direction.

[0054] The cylinder cover 50 according to the third embodiment can also achieve the same effects as those of the first embodiment. Furthermore, as in the third embodiment, by engaging the first flange 55 and the second flange 60 with each other, part of the weight of the second cover 52 can be supported by the first cover 51, thereby reducing the load on the pin 53. Note that the first cover 51 and the second cover 52 according to the third embodiment may be connected by a bolt 33a shown in FIG. 5 instead of the pin 53.

[0055] The above-described embodiments are merely illustrative examples of the present invention, and are not intended to limit the scope of the present invention to these embodiments. Those skilled in the art can implement the present invention in various other forms without departing from the spirit of the present invention. [Explanation of symbols]

[0056] 1. Hydraulic excavator (work machine) 2 Undercarriage (car body) 3 Upper rotating body (car body) 4 Front work equipment 4a Boom 4b Arm 4c Bucket 4d Boom cylinder (hydraulic cylinder) 4e Arm cylinder (hydraulic cylinder) 4f Bucket cylinder (hydraulic cylinder) 5 Swivel frame 6 Counterweight 7 Cab 8 Soil removal blade 10,30,50 Cylinder cover 11,31,51 1st cover 12,32,52 Second cover 13 Connecting member 14a, 14b Cap 15,16a,16b,19a,19b,20a,20b,21a,21b,36,53a,56 Through hole 17 Protection Department 18a,18b,39a,39b,59a,59b Wrapped part 22 volts 23 Cylinder tube 24 Cylinder rod 25 Guide member 33a Bolt (connecting member) 33b double nut 34,54 1st Protection Department 35,55 First flange 37,57 First through hole 38,58 2nd Protection Department 40,60 Second flange 41,61 Second through hole 53 Pin (connecting member) 53b Retaining pin

Claims

1. A work machine comprising: a vehicle body; a working device that is supported by the vehicle body and operates; a hydraulic cylinder that rotates the connected working device by extending and retracting a cylinder rod relative to a cylinder tube; and a cylinder cover that protects the hydraulic cylinder, The cylinder cover is a first cover attached to the cylinder rod; a second cover that is guided by a guide member attached to the cylinder tube and is slidable in the extension / contraction direction of the cylinder rod; a connecting member that connects the first cover and the second cover, The second cover is The cylinder rod is connected to the first cover by the connecting member so as to be rotatable about a rotation axis extending in the extension / contraction direction of the cylinder rod. A work machine characterized by:

2. 2. The work machine according to claim 1, The connecting member is made of resin or rubber. A work machine characterized by:

3. 3. The work machine according to claim 2, a widthwise dimension of the first cover perpendicular to the extension / contraction direction gradually increases from a first dimension to a second dimension longer than the first dimension toward the second cover; The widthwise dimension of the second cover and the connecting member is the second dimension. A work machine characterized by:

4. 2. The work machine according to claim 1, The first cover is a first protective portion extending in the stretching direction; a first flange portion that projects from an end of the first protection portion and has a first through hole that penetrates in the extension / contraction direction; The second cover is A second protection portion extending in the extension and contraction direction; a second flange portion that projects from an end of the second protection portion and has a second through hole that penetrates in the extension / contraction direction; The connecting member connects the first cover and the second cover in a state where the connecting member is inserted into the first through hole and the second through hole. A work machine characterized by:

5. 2. The work machine according to claim 1, The first cover is a first protective portion extending in the stretching direction; a first flange portion that projects from an end of the first protection portion and has a first through hole that penetrates in the extension / contraction direction; The second cover is A second protection portion extending in the extension and contraction direction; a second flange portion that projects from an end of the second protection portion and has a second through hole that penetrates in the extension / contraction direction; The connecting member connects the first cover and the second cover in a state in which the first flange portion and the second flange portion are engaged with each other and inserted into the first through hole and the second through hole. A work machine characterized by:

6. A cylinder cover for protecting a hydraulic cylinder having a cylinder tube and a cylinder rod that is extendable relative to the cylinder tube, a first cover attached to the cylinder rod; a second cover that is guided by a guide member attached to the cylinder tube and is slidable in the extension / contraction direction of the cylinder rod; a connecting member that connects the first cover and the second cover, The second cover is The cylinder rod is connected to the first cover by the connecting member so as to be rotatable about a rotation axis extending in the extension / contraction direction of the cylinder rod. A cylinder cover characterized by:

Images