JPH078448U - Automatic greasing device for work attachments - Google Patents

Abstract

(57) [Abstract] [Purpose] In the telescopic arm of the work attachment, since the upper arm performs the telescopic operation with respect to the lower arm, it has been difficult to perform centralized lubrication on the front and rear roller devices. Since the mounting position of the roller device is far away from the driver's seat, not only is it troublesome to manually perform greasing, but also the work efficiency is reduced. This problem is solved. [Constitution] In the automatic greasing device of the present invention, a greasing box having a grease pump and a grease tank is attached to the mounting portion of the arm cylinder mounting bracket fixed to the upper part of the boom, and the rear end of the arm cylinder is attached. The upper end of the lever member erected on the boss and the piston front end of the piston pump are connected to each other, and the grease delivery port of the grease pump and the grease passage of the roller device are configured to be piped through a distribution valve. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic greasing device for a work attachment mounted on a hydraulic excavator.

[0002]

[Prior art]

 FIG. 5 is a side view showing a conventional telescopic arm 1 (known in Japanese Utility Model Publication No. 58-38048) mounted on a hydraulic excavator (not shown). 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 a lower arm of the telescopic arm 1, 5 is an upper arm, 6 and 7 are lower arms 4, and an upper part. The arms 5 are rails, 8 and 9 are roller devices, 10 is a bucket, 11 is a boom cylinder, 12 is an arm cylinder, 13 is a telescopic cylinder, and 14 is a bucket cylinder. FIG. 6 shows an upper roller 15 (the lower roller and the upper roller have the same shape and dimension) of the roller device 8 (the roller device 9 is structurally the same) showing the greasing device of the conventional telescopic arm 1. FIG. In the figure, 16 is a roller of the upper roller 15, 17 is a roller shaft, 18 is a grease passage formed inside the roller shaft 17, 19 is a needle bearing, 20 and 21 are left and right side plates of the needle bearing 19, and 22 is A bolt with a plate for holding the roller 16 and the needle bearing 19 on the roller shaft 17, 23 is a nut for fastening the roller shaft 17 to the bracket 24, 25 is a washer, 26 is a greasing of the grease passage 18. It is a grease nipple worn as a mouth. Therefore, when lubricating the upper roller 15 shown in FIG. 6, grease is injected from the grease nipple 26 using a grease gun. The injected grease is sent to the needle bearing 19 through the grease passage 18, so that the grease can be lubricated.

[0003]

[Problems to be solved by the device]

 Since the telescopic arm has upper and lower rollers on the left and right sides of the front and rear roller devices, respectively, to perform telescopic operation, it has been difficult to perform centralized lubrication of all the rollers. For this reason, the driver manually lubricates a plurality of rollers every predetermined time. Since the rollers are installed far away from the driver's seat and the number of times of lubrication is large, it is troublesome and reduces work efficiency. The present invention aims to solve the above problems.

[0004]

[Means for Solving the Problems]

 In the automatic greasing device of the present invention, a boom, an arm, and a bucket are sequentially connected to the front part of the hydraulic excavator so as to be rotatable in the front-rear direction to form a work attachment, and the roller attached to the work attachment. In a greasing device for work attachments that lubricates equipment, etc., a grease pump that sends grease by piston reciprocating motion and the grease pump can be sent to the mounting part of the boom arm cylinder mounting bracket. Install a greasing box equipped with a grease tank that stores grease in advance, and install a lever member by fixing it to the upper surface of the rear end boss of the arm cylinder installed on the front upper part of the boom. Rotatably connect the upper end of the grease pump and the front end of the grease pump piston, A grease delivery port of the serial grease pump, so as to communicate via the distribution valve and a grease passage inside the roller device, configured by piping.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a telescopic arm 1A having an automatic greasing device of the present invention. In the figure, 27 is a boom, 28 is a lower arm of the telescopic arm 1A, 29 is rails projecting laterally on both upper sides of the lower arm 28, 30 is an upper arm, 31 is both lower sides of the upper arm 30. A rail protruding toward the side, 32 is a roller device on the front side of the telescopic arm 1A, 33 is a bracket of the roller device 32, 34 is a roller device on the rear side, 35 is a bracket of the roller device 34, and 36 is A telescopic cylinder, 37 is a bucket cylinder, 38 is an arm cylinder, 39 is a lever member standing on the rear end boss 40 of the arm cylinder 38, 41 is an arm cylinder mounting bracket fixed to the back of the boom 27, 42 is a greasing box, 43 is a piston provided in the greasing box 42, and 44 and 45 are from the greasing box 42. The greasing pipes and the bucket 46, which are respectively provided to the roller devices 32 and 34, are provided.

FIG. 2 is a cross-sectional view of the main part seen from AA in FIG. In the figure, 47 is a grease pump provided inside the grease feed box 42, 43 is a piston of the grease pump 47, 48 is a piston head of the piston 43, 49 is a piston rod, 50 is a piston head 48 and a piston rod. Reference numeral 51 and 52 are check valves, 53 is a grease tank, and 54 is a distribution valve. The grease tank 53 is a pressure accumulating container, and may have a piston and a spring built therein, or may be a bellows-shaped container having elasticity. FIG. 3 is a detailed view of the roller device 32 in section B of FIG. In the figure, 55 is an upper roller, 56 is a lower roller, 57 and 58 are roller shafts of the upper roller 55 and the lower roller 56, 59 is a greasing port formed on the plate thickness side surface of the bracket 33, and 60 is a bracket. 33 is a grease passage formed inside 33 and communicating from the greasing port 59 to the roller shafts 57 and 58. The roller device 34 on the rear side is structurally similar to the roller device 32, and is not shown. FIG. 4 is a cross-sectional view of the main part of the notch seen from CC in FIG. In the figure, 61 and 61 are needle bearings of the upper and lower rollers 55 and 56, and 62 and 63 are grease passages formed inside the roller shafts 57 and 58, respectively.

Next, the structure of the automatic greasing device of the present invention will be described with reference to FIGS. In the present invention, in the mounting portion of the arm cylinder mounting bracket 41 of the boom 27, a grease pump 47 for delivering grease by the reciprocating movement of the piston (43) and a grease tank in which the grease to be delivered by the grease pump 47 is stored in advance. A greasing box 42 having 53 is fixed and attached, and a lever member 39 is fixedly erected on the upper surface of the rear end boss 40 of the arm cylinder 38 mounted on the front upper part of the boom 27. The upper end of the member 39 and the front end of the piston (43) are rotatably connected by a pivot pin 64, and the grease pump 47 has a grease delivery port (denoted by reference numeral 65 in FIG. 2). And the roller device 32 (the roller device 34 has the same piping configuration as the roller device 32, so the roller device 32 side will be described as a representative. The greasing port 59 formed in the bracket 33 (shown) is connected to the greasing pipe 44 via the distribution valve 54.

Next, the operation of the automatic greasing device of the present invention will be described. When the arm cylinder 38 is extended and contracted, the rod tip end portion of the arm cylinder 38 turns around a locus of radius R around the arm base end portion pin (which is also a boom tip end pin) 66 shown in FIG. Therefore, the arm cylinder 38 makes a pivoting motion in the forward and downward direction within the range of the angle α. The upper end of the lever member 39 and the front end of the piston (43) are connected by a pivot pin 64, and the piston rod 49 (shown in FIG. 2) of the piston 43 and the piston head 48 are connected by a spherical bearing 50. The piston 43 can reciprocate without any trouble. Then, the grease delivered from the grease delivery port 65 of the grease pump 47 is fed to the distribution valve 54, and is branched to the lubrication piping (44, 45) by the distribution valve 54. The pipe 44 will be described as a representative of the pipes 44 and 45. The grease sent to the pipe 44 includes the greasing port 59 shown in FIGS. 3 and 4, the grease passage 60 inside the bracket (33), and the roller shaft. The grease is fed to the needle bearing 61 through grease passages 62 and 63 formed inside 57 and 58 (shown in FIG. 4), respectively. Therefore, the expansion / contraction operation of the arm cylinder 38 can automatically lubricate the upper roller (55) and the lower roller (56) of the roller device (32, 34).

[0009]

[Effect of device]

 In the telescopic arm of the work attachment attached to the hydraulic excavator, since the upper arm performs the telescopic operation with respect to the lower arm, it has been difficult to perform centralized lubrication on the front and rear roller devices. The above-mentioned roller device is installed far away from the driver's seat, which not only complicates the manual greasing, but also reduces the work efficiency. However, in the automatic greasing device of the present invention, the boom arm cylinder mounting bracket mounting portion is provided with a grease pump that discharges grease by reciprocating the piston and a grease tank that stores the grease that the grease pump stores beforehand. Attach the greasing box, and install the lever member on the upper surface of the rear end boss of the arm cylinder installed on the front upper part of the boom. The front end of the pump piston is rotatably connected, and the grease outlet of the grease pump and the grease passage inside the roller shaft are connected by piping through a distribution valve. . As a result, when the arm cylinder is expanded and contracted, grease is automatically delivered from the grease pump, so that the roller devices before and after the telescopic arm can be lubricated. Therefore, the driver does not have to leave the driver's seat to manually lubricate the roller device, and the work does not have to be interrupted for the lubrication, thus saving labor and improving work efficiency. .

[Brief description of drawings]

FIG. 1 is a side view showing a telescopic arm equipped with the automatic greasing device of the present invention.

FIG. 2 is a cross-sectional view of a main part seen from AA in FIG.

FIG. 3 is a detailed view of the roller device in section B of FIG.

FIG. 4 is a cross-sectional view of a main part of a notch seen from CC in FIG.

FIG. 5 is a side view showing a conventional telescopic arm.

FIG. 6 is a sectional view showing a conventional greasing device.

[Explanation of symbols]

 1,1A Telescopic arm 4,28 Lower arm 5,30 Upper arm 8,9,32,34 Roller device 12,38 Arm cylinder 39 Lever member 40 Rear end boss 41 Arm cylinder mounting bracket 42 Greasing box 43 Piston 50 Spherical surface Bearing 47 Grease pump 53 Grease tank 54 Distribution valve 65 Grease outlet

Claims (1)

[Scope of utility model registration request] 1. A work attachment is constructed by sequentially connecting a boom, an arm, and a bucket to a front portion of a hydraulic excavator so as to be able to rotate in the front-rear direction, and the work attachment is equipped with a roller device and the like. In a greasing device for a work attachment that is lubricated, a grease pump that delivers grease by piston reciprocation and the grease that the grease pump delivers should be stored in advance in the mounting portion of the boom arm cylinder mounting bracket. Install a greasing box with a grease tank, and install a lever member on the upper surface of the rear end boss of the arm cylinder mounted on the upper front side of the boom, and set it upright. Connect the front end of the piston of the grease pump rotatably, An automatic greasing device for a work attachment, characterized in that the grease outlet is connected to the grease passage inside the roller device via a distribution valve.