JPH0571410U - Structure to prevent rattling of the cylinder cover - Google Patents

Abstract

(57) [Summary] [Purpose] In the cylinder cover of the related art, there is a gap between the guide plate fixed to the hydraulic cylinder and the facing surface of the guide fitting portion of the cover plate. Therefore, when the construction machine equipped with the hydraulic cylinder performs work, rattling noise and chatter noise due to the above gap are generated. The rattling noise and chattering noise not only make the driver uncomfortable, but also may cause noise pollution in the surrounding area. The present invention solves the above problems. [Structure] In the cylinder cover of the present invention, a muffling member that muffles rattling noise is attached to the sliding surface portion of the guide plate with respect to the cover plate. Alternatively, a sound deadening member for deadening rattling noise is attached to the sliding surface portion of the guide fitting portion of the cover plate with respect to the guide plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a cylinder cover for protecting hydraulic cylinders mounted on work attachments of construction machines such as hydraulic excavators and work vehicles.

[0002]

[Prior Art]

 FIG. 7 is a side view of a hydraulic excavator having a cylinder cover 1 of the related art. In the figure, 2 is a work attachment mounted on the front part of the hydraulic excavator, 3 is a boom of the work attachment 2, 4 is an arm, 5 is a bucket, 6 is a boom cylinder, 7 is an arm cylinder, and 8 is a bucket cylinder. FIG. 8 is a side view of a work attachment 10 having a cylinder cover 9 according to another embodiment of the prior art. In the figure, 11 is a boom cylinder mounted on the work attachment 10. FIG. 9 is a side view of the cylinder cover 9 in FIG. In the figure, 12 is a cylinder tube of the boom cylinder 11, 13 is a rod, 14 is a rod boss, 15 is a mounting seat, 16 is a guide plate, 17 is a cover plate, and 18 is a tightening bolt. FIG. 10 is a view seen from AA in FIG. Reference numerals 19L and 19R are left and right guide fitting portions of the cover plate 17, and reference numeral a is a welding portion for fixing the guide plate 16 to the cylinder tube 12.

Next, the configuration of the cylinder cover 9 of the prior art will be described with reference to FIGS. 8 to 10. A guide plate 16 is welded to the outer circumference of the cylinder tube 12 of the boom cylinder 11, and the front end of the cover plate 17 is attached to the mounting seat 15 of the rod 14 of the boom cylinder 11. The opposing surfaces of the plate 16 and the guide fitting portions 19L and 19R of the cover plate 17 are made to slide so that the rod (13) portion protruding from the cylinder tube 12 is protected.

When the hydraulic excavator performs excavation work, depending on the work situation, debris or the like may collide with the rod portion of the hydraulic cylinder (boom cylinder, arm cylinder, bucket cylinder, etc.) equipped on the work attachment. Therefore, in order to prevent damage to the hydraulic cylinder, a cylinder cover is attached if necessary.

[0005]

[Problems to be solved by the device]

 Steel plates are used as the material for the cylinder cover guide plate and cover plate for reasons of strength and manufacturing. Since the cover plate slides relative to the guide plate, as shown in FIG. 10, a gap S1 is formed between the guide plate 16 and the guide fitting portion 19L (19R) of the cover plate 17 facing each other. , S2 exist. For this reason, when the hydraulic excavator rotates the work attachment in the front-rear direction to perform work, rattling noise and chattering noise caused by the above-mentioned facing gaps S1 and S2 are generated. The rattling noise and chattering noise not only make the driver uncomfortable, but also may cause noise pollution in the surrounding area. The present invention aims to solve the above problems.

[0006]

[Means for Solving the Problems]

 In the cylinder cover of the present invention, a muffling member that muffles rattling noise is attached to the sliding surface portion of the guide plate with respect to the cover plate. Alternatively, a muffling member that muffles rattling noise is attached to the sliding surface portion of the guide fitting portion of the cover plate with respect to the guide plate.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing a cylinder cover 9a according to a first embodiment of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as the cylinder cover 9 of the prior art. Reference numeral 20 is a sound deadening member such as a resin material (including Teflon, urethane, etc.) having sound deadening properties and abrasion resistance. FIG. 2 is a view showing the sound deadening member 20 as seen from BB in FIG. Next, the rattling prevention structure of the cylinder cover 9a according to the first embodiment of the present invention will be described with reference to FIGS. A muffling member 20 that muffles rattling noise is attached to the sliding surface of the guide plate 16 against the cover plate 17. In the cylinder cover 9a, the tubular (pipe-shaped) sound deadening member 20 is fitted to the guide plate 16. A sheet-shaped muffling member may be fixed by winding or sticking. Further, FIG. 3 is a view showing the sound deadening member 20 'of another embodiment, but it may be set so as to have an elastic margin u when the pipe-shaped sound deadening member 20' is fitted into the guide plate 16.

Next, the operation of the cylinder cover 9a according to the first embodiment of the present invention will be described. As shown in FIG. 1, the thickness of the sound deadening member 20 is set to be approximately (S1 + S2). Therefore, by mounting the sound deadening member 20 on the guide plate 16, the cover plate 17 is attached to the guide plate 16. There are no gaps in the vertical direction. Therefore, when the hydraulic excavator rotates the work attachment to perform work, it is possible to prevent rattling noise and chatter noise between the guide plate 16 and the cover plate 17. In addition, even if the sliding surface on the outer surface of the sound deadening member 20 is worn and a slight gap is created between the sliding surfaces facing each other of the cover plate 17 when the work is performed for a long time, the sound deadening member 20 exerts the sound deadening function. It is possible to prevent rattling noise and chatter noise between the arrow-tension guide plate 16 and the cover plate 17.

Next, FIG. 4 is a cross-sectional view of an essential part showing a second embodiment cylinder cover 9b of claim 1 of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as the cylinder cover 9a of the first embodiment in FIG. Reference numeral 17 'is a cover plate, 19'L and 19'R are left and right guide fitting portions of the cover plate 17', and 21 is a sound deadening member. In the cylinder cover 9b of the second embodiment, the sound deadening member 21 is attached to both the upper and lower sliding surfaces (as shown) of the left and right guide fitting portions 19'L, 19'R of the cover plate 17 '. The outer surfaces (sliding surfaces) of the upper side and the lower side of are contacted with each other. The operation and function of the cylinder cover 9b of the second embodiment is similar to that of the cylinder cover 9a of the first embodiment.

Next, FIG. 5 is a cross-sectional view of essential parts showing a cylinder cover 22 according to claim 2 of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as the cylinder cover 9b in FIG. Reference numerals 23, 24, 25 and 26 are sheet-like muffling members. FIG. 6 is a cutaway side view of the cylinder cover 22 as viewed from C of FIG. Next, the rattling prevention structure of the cylinder cover 22 according to claim 2 of the present invention will be described with reference to FIGS. Sheet-like silencing members 23 and 24, 25 and 26 are attached to the upper and lower sliding surfaces (as shown) of the left and right guide fitting portions 19'L and 19'R of the cover plate 17 ', respectively. I attached it. The sheet-shaped sound deadening members 23 and 24, 25 and 26 are adhered by using an adhesive or baking. The operation and function of the cylinder cover 22 are similar to those of the cylinder cover 9b of the second embodiment of the first aspect.

[0011]

[Effect of the device]

 In the conventional cylinder cover, there is a gap between the guide plate fixed to the hydraulic cylinder and the facing surface of the guide fitting portion of the cover plate. Therefore, when the construction machine equipped with the hydraulic cylinder performs work, rattling noise and chatter noise are generated due to the gap. The rattling noise and chattering noise not only made the driver uncomfortable, but also caused noise pollution in the surrounding area. However, in the cylinder cover of the present invention, a muffling member that muffles rattling noise is attached to the sliding surface of the guide plate with respect to the cover plate. Alternatively, a muffling member that muffles rattling noise is attached to the sliding surface of the guide fitting portion of the cover plate with respect to the guide plate. By mounting the sound deadening member on the guide plate side or the guide fitting side of the cover plate in this way, there is no gap in which the cover plate rattles against the guide plate. Therefore, it is possible to prevent rattling noise and chatter noise between the guide plate and the cover plate when the construction machine works. In addition, if the sliding surface on the outer surface of the sound deadening member is worn out after a long period of work and a slight gap is created between the sliding surfaces facing each other of the cover plate, the sound deadening member exerts the sound deadening function. It is possible to prevent rattling noise and chatter noise of the cover plate.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a cylinder cover according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a sound deadening member viewed from BB of FIG.

FIG. 3 is a view showing another embodiment of the sound deadening member in FIG.

FIG. 4 is a cross-sectional view of essential parts showing a second embodiment cylinder cover of the first aspect of the present invention.

FIG. 5 is a sectional view of an essential part showing a cylinder cover according to claim 2 of the present invention.

FIG. 6 is a cutaway side view of the cylinder cover seen from C of FIG. 5;

FIG. 7 is a side view of a hydraulic excavator having a cylinder cover according to a conventional technique.

FIG. 8 is a side view of a work attachment having a cylinder cover according to another embodiment of the prior art.

9 is a side view of the cylinder cover in FIG.

10 is a view seen from AA in FIG. 9. FIG.

[Explanation of symbols]

1,9,9a, 9b, 22 Cylinder cover 2,10 Work attachment 6,11 Boom cylinder 7 Arm cylinder 8 Bucket cylinder 12 Cylinder tube 13 Rod 16 Guide plate 17,17 'Cover plate 19L, 19R, 19'L, 19 'R guide fitting part 20, 20', 21, 23, 24, 25, 26 Silencing member

Claims (2)

[Scope of utility model registration request] 1. A guide plate is fixedly provided on an outer peripheral portion of a cylinder tube of a hydraulic cylinder, and a front end portion of a cover plate is attached to a vicinity of a rod tip end of the hydraulic cylinder. In a cylinder cover that protects the rod portion protruding from the cylinder tube by making the opposite surface of the plate that slides against the guide fitting part slide, the sliding surface part of the guide plate with respect to the cover plate rattles. A structure to prevent rattling of the cylinder cover, which is equipped with a noise reduction member that silences noise. 2. A guide plate is fixedly provided on an outer peripheral portion of a cylinder tube of the hydraulic cylinder, and a front end portion of a cover plate is attached near a tip end portion of the rod of the hydraulic cylinder. In the cylinder cover designed to protect the rod portion protruding from the cylinder tube by sliding the opposite surface of the plate to the guide fitting portion, sliding the guide fitting portion of the cover plate against the guide plate. A structure for preventing rattling of a cylinder cover, in which a silencing member for silencing rattling noise is attached to the surface portion.