JPH0562706U - Piston rod protection device for fluid cylinder device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a piston rod protection device capable of guiding a protection plate for protecting a piston rod without rattling and suppressing wear. A pair of guided rollers is arranged near both sides of the protective plate on the side facing the cylinder, and the guided rollers are always engaged with both side edges of the guide plate. Further, the roller is supported by the spacer, and a lubricant is applied between the roller and the spacer. [Effect] The rattling-free engagement between the roller and the guide plate guides the protective plate smoothly, and There is no risk of chattering when driving. Further, since the protective plate is guided by the rolling of the roller, there is no sliding portion, and the problem of wear does not occur. Further, in the aspect of the present invention in which the roller is supported by the spacer and the lubricant is applied between the roller and the spacer, the lubricant is not exposed to the earth and sand, and the smooth rotation of the roller is guaranteed. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piston rod protection device in a fluid cylinder device. In particular, the present invention is suitable for application to a hydraulic cylinder device used in a construction machine such as a power shovel, but is not limited to this application.

[0002]

[Prior art]

 Construction machines such as power shovels are often used to scoop up debris such as rocks, but in such work, rocks fall on a hydraulic cylinder. The surface of the piston rod of the hydraulic cylinder is hard chrome plated to improve the adhesion with the seal provided on the cylinder.However, if rocks etc. fall down during the work, the plated surface will be damaged, As a result of the damage, the seal is damaged.

In order to solve this problem, it has been proposed to provide a protective plate outside the cylinder device. For example, Japanese Utility Model Publication No. 3-46247 discloses a plate-shaped protector in which a plate-shaped guide rail is attached to the outside of a cylinder of a fluid cylinder device so as to extend in the longitudinal direction of the cylinder, and one end of which is fixed to a piston rod. There is disclosed a protection device for a fluid cylinder device, which is configured so as to be guided by this guide rail. In this protection device, the protector moves along the guide rail as the cylinder device expands and contracts, and protects the piston rod protruding from the cylinder.

In the structure shown in FIG. 8 of Japanese Utility Model Publication No. 3-46247, both side edges of the protector are bent in a U shape to form guide grooves, and the guide grooves are formed on both side edges of the guide rail. Engage with. In this structure, rattling occurs between the guide groove of the protector and the guide rail, which causes chatter noise, which is not preferable. Japanese Utility Model Publication No. 3-46247 shows a structure for solving this problem in FIG. In the structure shown in FIG. 4, guide shoes are attached to the inner surfaces of both sides of a plate-shaped protector, and both side edges of the guide rail are slidably engaged with the groove of the guide shoe.

[0005]

[Problems to be solved by the device]

 In the structure disclosed in Fig. 4 of Japanese Utility Model Publication No. 3-46247, a lubricant such as grease may be applied in order to prevent abrasion due to sliding between the plate-shaped guide rail and the guide shoe. is necessary. The applied lubricant adheres to the guide rail and is exposed to the outside of the protector as the cylinder device expands and contracts. Since the part to which the guide rail is attached is relatively exposed to the earth and sand, the earth and sand are likely to adhere to the lubricant on the guide rail, which causes wear of the guide shoe and the guide rail.

The present invention solves the above-mentioned problems of the piston rod protection device in the conventional cylinder device, and the protection plate for protecting the piston rod can be guided without rattling, and is not worn. It is an object of the present invention to provide a piston rod protection device that can be suppressed.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, a cylinder, a piston slidably arranged in the cylinder, and a piston rod fixed to the piston so that one end thereof extends outside the cylinder are provided. In this fluid cylinder device, one end is fixed near the outer end of the piston rod, and a protection plate is provided so as to extend in the longitudinal direction of the cylinder along the side of the piston rod and the cylinder, and between the cylinder and the protection plate. The guide plate is fixed to the outside of the cylinder by the so that the protection plate is guided by the guide plate in the longitudinal direction of the cylinder. Particularly, in the present invention, in the protective device having such a structure, at least a pair of guided rollers are arranged near both sides of the protective plate on the side of the protective plate facing the cylinder, and the guided rollers are the guide plates. It is characterized in that it is always engaged with both side edges.

In a preferred aspect of the present invention, the guided roller is rotatably supported by a spacer attached to the protective plate, and a lubricant is applied between the spacer and the guided roller.

[0009]

[Action]

 The cylinder device of the present invention having the above-mentioned configuration is attached to a machine such as a power shovel so that the protective plate faces the side where rocks and earth fall. According to the above configuration of the present invention, the protective plate moves along the side portion of the cylinder as the cylinder device expands and contracts. Therefore, the piston rod of the cylinder device is always covered with the protective plate, and there is no risk of hitting falling rocks or earth and sand. As the protective plate moves along the side of the cylinder, the rollers provided on the protective plate roll along the edges of the guide plate. Therefore, the protective plate can move smoothly. Further, since the roller can be mounted so as to be engaged with the guide plate without rattling, there is no risk of chattering noise and the like. Further, in a preferred embodiment of the present invention, since the roller is supported by the protective plate via the spacer and the lubricant is applied between the roller and the spacer, the movement of the roller becomes smoother and the lubricant is Since it is not exposed on the front side of the protective plate, there is no risk of soil and sand sticking to this lubricant.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a cylinder device 1 has a cylinder 2 and a piston 3 arranged in the cylinder so as to be slidable in the longitudinal direction. The piston 3 is provided with a piston rod 4. One end of this piston rod 4 is fixed to the piston 3, and the other end thereof projects from the cylinder 2 in the longitudinal direction. An end cap 5 is attached to the end of the cylinder 2, and a piston rod 4 extends in the longitudinal direction through the end cap 5. The end cap 5 is provided with a seal 6 that contacts the outer peripheral surface of the piston rod 4.

A guide plate 7 is arranged outside the cylinder 2 so as to extend in the longitudinal direction along the side portion of the cylinder 2. As shown in FIG. 2, a band 8 having a boss 9 is attached near the closed end of the cylinder 2. One end of the guide plate 7 is attached to the boss 9 with a bolt 10. At the opposite end of the cylinder 2, the other end of the guide plate 7 is attached to a boss 11 planted in the cylinder by a bolt (not shown).

Referring to FIG. 1, a protection plate 12 is disposed outside the guide plate 7. The protective plate 12 has one end fixed to the end of the piston rod 4 protruding from the cylinder 2. The other end of the protective plate 12 is guided by the guide mechanism 13 to the guide plate 7. The proposed mechanism 13 includes a pair of rollers 14 disposed adjacent to both side edges of the protective plate on the side facing the cylinder 2. As shown in FIG. 2, a spacer 15 having a substantially T-shaped cross section having a flange 15a is provided at each side edge of the protective plate, and the roller 14 is disposed between the flange 15a of the spacer 15 and the washer 16. Be done. The mounting bolt 17 is mounted so as to penetrate the spacer 15 and the washer 16 from the protective plate 12, and the nut 17a is engaged with the end portion of the bolt 17. With this structure, the roller 14 is attached to the protective plate.

A groove 14 a is formed around the roller 14. Both side edges of the guide plate 7 fit into the groove 14a without rattling. A lubricant such as grease is applied between the roller 14 and the spacer 15 and between the roller 14 and the washer 16. In the structure described above, when the cylinder device 1 expands and contracts, the piston rod 4 moves in and out of the cylinder 2. Since one end of the protective plate 12 is attached to the piston rod 4, the protective plate 12 moves in the longitudinal direction of the cylinder device 1 according to the movement of the piston rod 4. At this time, the other end of the protective plate is guided by the guide plate 7. With the movement of the protection plate 12, the roller 14 rotates and moves along both side edges of the guide plate 7. Therefore, the movement of the protective plate 12 is smoothly performed.

FIG. 3 shows an example in which the cylinder device 1 according to the embodiment of the present invention is attached to a power shovel 18. The cylinder device 1 is attached to the boom 18 a of the power shovel 18. This mounting is performed so that the protective plate 12 of the cylinder device 1 faces the operating area 19 of the shovel 18b. Therefore, the rocks 20 falling from the shovel 18 during the work hit the protection plate and do not damage the piston rod 4 covered by the protection plate. Also, since the roller 14 is in the shadow of the protective plate, the lubricant for the roller 14 is not exposed in the working area. Therefore, there is no problem that sediment adheres to the lubricant.

[0015]

【effect】

 According to the configuration of the present invention, the rattle-free engagement between the roller 14 and the guide plate 7 allows the protective plate to be smoothly guided and eliminates the possibility of chattering noise when the machine is running. Further, since the protective plate is guided by the rolling of the rollers, there is no sliding portion, and there is no problem of wear. Further, in the aspect of the present invention in which the roller is supported by the spacer and the lubricant is applied between the roller and the spacer, the lubricant is not exposed to the earth and sand, and the rotation of the roller is smooth. Guaranteed.

[Brief description of drawings]

FIG. 1 is a sectional view of a cylinder device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a side view showing a state in which the cylinder device according to the embodiment of the present invention is attached to a power shovel.

[Explanation of symbols]

1 is a cylinder device, 2 is a cylinder, 3 is a piston, 4 is a piston rod, 7 is a guide plate, 12 is a protective plate, 14 is a roller, 15 is a spacer, and 16 is a washer.

Claims (2)

[Scope of utility model registration request] 1. A piston comprising a cylinder, a piston slidably arranged in the cylinder, and a piston rod fixed to the piston and having one end extending outward from the cylinder. One end is fixed near the outer end and is fixed to the outside of the cylinder between the protection plate and a protection plate extending in the longitudinal direction of the cylinder along the side of the piston rod and the cylinder. In a fluid cylinder device piston rod protection device in which a guide plate is provided, and the protection plate is guided in the longitudinal direction of the cylinder by the guide plate, on the side of the protection plate facing the cylinder. Has at least a pair of guided rollers near both sides of the protective plate, and the guided rollers are always engaged with both side edges of the guide plate. Piston rod protection device for fluid cylinder device, characterized in that 2. The piston rod protection device for a fluid cylinder device according to claim 1, wherein the guided roller is rotatably supported by a spacer attached to the protection plate, and the spacer and the guided guide are supported. A piston rod protection device for a fluid cylinder device, characterized in that a lubricant is applied between the roller and the roller.