JPH0653653U - Automatic greasing structure of bucket link mechanism - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide an automatic greasing structure that does not expose the automatic greasing structure to the outside and facilitates maintenance of the bucket link mechanism. [Structure] An idler link base end mounting boss 5 on the front of the arm from a distribution valve mounted on the arm 6'through a greasing pipe.
4 and from there, through a grease passage inside one idler link, a bucket link base end pin coupling part 5
It is formed so as to communicate with the greasing point of No. 2, and the greasing section of the bucket link tip boss 76 can be communicated with each other through the grease passage inside the other idler link and the grease pipe inside the bucket link. Configured to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic greasing structure for a bucket link mechanism mounted on the tip of a work attachment of a hydraulic excavator.

[0002]

[Prior art]

 FIG. 5 is a diagram showing a configuration of a conventional automatic greasing device mounted on a hydraulic excavator. In the figure, 1 is a lower traveling body of a hydraulic excavator, 2 is a slewing bearing, 3 is an upper slewing body, 4 is a work attachment mounted on the front part of the upper slewing body 3, 5 is a boom of the work attachment 4, and 6 is An arm, 7 is an idler link, 8 is a bucket link, 9 is a bucket as a work tool, 10 is a boom cylinder, 11 is an arm cylinder, 12 is a bucket cylinder, 13 is a greasing port of the slewing bearing 2, 14 ... 24 is a greasing port of each pin coupling portion, 25 is an electric grease pump unit, 26 is a grease pump, 27 is a grease pump electric motor, 28 is a pressure accumulating grease cartridge, 29 is a parent distribution valve, 30, 31 is a child distribution valve, 32 and 33 are outlet ports of the parent distribution valve 29, 34, 35 and 36 are outlet ports of the child distribution valve 30, 37, , 42 are outlet ports of the child distributing valve 31, 43 is an engine mounted on a hydraulic excavator, 44 is a power source, 45 is a key switch, 46 is a controller, 47 is a display device for occurrence of an abnormality, and 48 is a parent. It is a limit switch equipped with the distribution valve 29.

As shown in FIG. 5, in the conventional automatic greasing device, an electric grease pump 26 having a grease cartridge 28 is provided on the upper swing body 3 of the hydraulic excavator, and each pin connecting portion ( The greasing ports 14, ..., 24 of the slewing bearing 2) are connected to each other through a parent distribution valve 29, slave distribution valves 30, 31 and a greasing pipe. When the engine 43 is operated for a set cumulative time, for example, a predetermined T time, the grease pump electric motor 27 is rotationally operated by the counter function of the controller 46. As a result, the grease pump 26 rotates, and the grease filled in the grease cartridge 28 is supplied from the grease pump 26 through the parent distribution valve 29, the child distribution valves 30 and 31, and the greasing piping to each greasing port. The grease is sent to 14, 24 and 24, and lubrication is automatically performed. When the above greasing is completed, the limit switch 48 provided in the parent distribution valve 29 operates, so that the switch signal is input to the controller 46. Then, the command signal from the controller 46 is output to the grease pump electric motor 27, and the grease pump 26 is stopped. This greasing process is automatically repeated.

[0004]

[Problems to be solved by the device]

 The automatic greasing structure of the bucket link mechanism equipped at the tip of the work attachment of the hydraulic excavator has not been shown, but various considerations have been taken into consideration. However, since the bucket link mechanism moves like a lever link, it is difficult to construct an automatic greasing structure, and the structure around the link mechanism has been drastically changed. As a result, its structure was complicated and the number of parts was large, which made it unwell. It is an object of the present invention to provide an automatic greasing structure for a bucket link mechanism that can solve the above problems.

[0005]

[Means for Solving the Problems]

 The automatic linking mechanism of the bucket link mechanism of the present invention is equipped with a boom, an arm, an idler link, and a work attachment that rotatably connects a bucket at the front part of the hydraulic excavator, and the hydraulic excavator body is electrically driven. An automatic greasing device that includes a grease pump, and connects the grease pump and the greasing points of the pin connection parts of the work attachment through a distribution valve, a greasing pipe, and a grease passage. Attach a distribution valve to the arm, connect the multiple greasing pipes branched from the distribution valve to the idler link base end mounting boss on the front of the arm, and connect the grease passages leading to the greasing pipe to the left and right. It is formed so as to pass through the inside of each pair of idler links. The grease passage on the other side of the idler link is formed so as to communicate with the oil spot, and the pin connecting part of the bucket link tip boss is connected via the bucket link base end boss and the grease pipe arranged inside the bucket link. It was constructed by communicating with the greasing point of.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing the structure of an automatic greasing device for a hydraulic excavator having an automatic greasing structure for a bucket link mechanism according to the present invention. In the figure, components using the same components as those of the conventional technique are designated by the same reference numerals as those of the conventional technique. 4'is a work attachment, 6'is an arm of the work attachment 4 ', 7'is an idler link, 8'is a bucket link, 49 is an arm 6'idle link base end pin connecting portion, and 50 is an arm. The front end pin connecting portion 51 is a bucket link base end pin connecting portion, 52 is a bucket link front end pin connecting portion, and 31 'and 53 are slave distribution valves, respectively. FIG. 2 is a sectional view showing a link mechanism for a bucket provided with the automatic greasing structure of the present invention. In the figure, 7'L and 7'R are left and right idler links of the pair respectively, 54 is an idler link base end mounting boss of the arm 6 ', and 55 and 56 are child distribution valves 53 (shown in FIG. 1). The greasing pipes 59, 60 and 61, which communicate with the greasing ports 57 and 58 of the idler link base end mounting boss 54, are connecting pins of the pin connecting portions 49, 51 and 52, respectively.

Next, an automatic greasing structure of the bucket link mechanism of the present invention will be described with reference to FIGS. 1 and 2. The distribution valve 53 is attached to the arm 6 ′ of the work attachment 4 ′ for the hydraulic excavator, and the greasing pipes 55 and 56 branched from the distribution valve 53 are attached to the idler link base end mounting boss 54 at the front of the arm (6 ′). The left and right greasing ports 57 and 58 are connected to each other. One of the greases sent from the distribution valve 53 there is formed by penetrating the grease passage 62 opened inside the left side of the idler link base end mounting boss 54 and the inside of the left idler link 7'L. Grease is supplied to the sliding surface portion of the coupling pin 60 and the base end of the bucket link 8 ′ through the grease passage 63 formed and the grease passages 64 to 68 which are opened inside the coupling pin. The other grease sent from the distribution valve 53 is formed by penetrating the grease passage 69 opened inside the right side of the idler link base end mounting boss 54 and the inside of the right side idler link 7'R. Grease passage 70, grease groove 71, grease passage 72, grease passage 74 opened inside the bucket link base end boss 73 on the right side, greasing pipe 75 arranged inside the bucket link 8 ', and bucket link tip It is supplied to the grease storage chamber 78 of the pin coupling portion 52 via the greasing port 77 of the boss 76. A seal groove is formed on the rotating contact surface of the grease passage and the grease groove to prevent grease from leaking out, and a seal member is fitted in the seal groove. Absent. FIG. 3 shows another embodiment of the grease passage formed through the idler links 7'L and 7'R. As shown in FIG. 3, grease grooves 79 may be formed in the side surfaces of the idler links 7'L and 7'R, and the lid plate 80 may be welded to the outside thereof.

Although a detailed cross section of the arm tip portion pin coupling portion 50 of the arm 6 ′ is not shown, as shown in FIG. 1, a greasing pipe 81 (which extends from the child distribution valve 53 to the inside of the arm 6 ′). The grease is supplied to the greasing port 22 of the arm tip pin coupling portion 50 through the broken line). Further, as shown in FIG. 2, grease is supplied to the sliding surface portion of the piston rod tip portion of the arm cylinder 12 through a grease passage 82 branched and opened from the grease passage 67 inside the coupling pin 60. I have to.

The left and right idler links 7'L and 7'R shown in FIG. 2 are made of cast steel or forged steel. However, in some cases, a steel plate is cut into a link plate and a boss plate, which are welded to produce an idler link. FIG. 4 is a cross-sectional view showing an automatic greasing structure in the case of using steel plate idler links 83L and 83R. In the figure, 49 'is a pin connecting part for the idler link base end of the arm 6', 51 'is a pin connecting part for the bucket link base end, and 59', 60 'are both pin connecting parts 49', 51 '. Each is a connecting pin. There are quite small gaps on the welding mating surfaces a, b, c and d of the link plate and the boss plate forming the idler links 83L and 83R. Therefore, if a grease passage is bored through the welding mating surfaces A, B, C, and D at right angles, grease at the time of grease feeding will leak into the coupling pin hole through the gap. Therefore, for the above reason, the grease is sent by bypassing the grease passages 84 and 85 formed in the coupling pins 59 'and 60', respectively.

[0010]

[Effect of device]

 The automatic greasing structure of the bucket link mechanism equipped at the tip of the work attachment of the hydraulic excavator has not been shown, but various considerations have been taken into consideration. However, since the bucket link mechanism moves like a lever link, it is difficult to construct an automatic greasing structure, and the structure around the link mechanism has been drastically changed. As a result, its structure was complicated and the number of parts was large, which made it unwell. However, in the automatic greasing structure of the present invention, a distribution valve is attached to the arm, and a plurality of greasing pipes branched from the distribution valve are connected to the idler link base end mounting boss on the front part of the arm to A grease passage leading to the pipe is formed so as to pass inside the pair of left and right idler links, and the grease passage on the inner side of one of the idler links is connected to the greasing point of the pin connecting part for the bucket link base end. The grease passage on the inner side of the other idler link, through the bucket link base end boss and the grease pipe installed inside the bucket link to the greasing point of the pin coupling part of the bucket link tip boss. I tried to establish communication. As a result, all the grease passages and the greasing pipes for automatic greasing pass through the inside of the component parts that make up the bucket link mechanism. That is, the structure around the bucket link mechanism does not change, and the automatic greasing structure is not exposed to the outside. Therefore, in the hydraulic excavator having the automatic greasing structure of the present invention, the maintainability and aesthetics of the bucket link mechanism can be ensured.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an automatic greasing device for a hydraulic excavator having an automatic greasing structure for a bucket link mechanism according to the present invention.

FIG. 2 is a sectional view showing a link mechanism for a bucket having an automatic greasing structure of the present invention.

FIG. 3 is another embodiment of the grease passage formed through the idler link in the present invention.

FIG. 4 is a sectional view showing an automatic greasing structure of the present invention when an idler link made of a steel plate is used.

FIG. 5 is a diagram showing a configuration of a conventional automatic greasing device mounted on a hydraulic excavator.

[Explanation of symbols]

4,4 'Work attachment 6,6' Arm 7,7 ', 7'L, 7'R, 83L, 83R Idler link 8,8' Bucket link 26 Grease pump 30,31,31 ', 53 Child distribution valve 49 , 49 'Pin connection part for idler base end 50 Arm end pin connection part 51, 51' Bucket link base end pin connection part 52 Bucket link front end pin connection part 54 Idler link base end installation boss 59 , 59 ', 60, 61', 61 Coupling pin 62, ~, 72, 74, 82, 84, 85 Grease passage 73 Bucket link base boss 76 Bucket link tip boss

Claims (1)

[Scope of utility model registration request] 1. A hydraulic excavator is equipped with a work attachment in which a boom, an arm, an idler link, and a bucket are rotatably connected to a front portion of the hydraulic excavator, and an electric grease pump is provided on a machine body of the hydraulic excavator. An automatic greasing device in which the greasing points of the pin coupling portions of the work attachment are communicated with each other through a distributing valve, a greasing pipe and a grease passage, and the distributing valve is attached to an arm, and the distributing valve is provided. Connect a plurality of greasing pipes branched from the above to the idler link base end mounting boss on the front part of the arm, and form the grease passage leading to the above greasing pipes so as to pass inside the pair of left and right idler links. , The grease passage on the inner side of one of the idler links is formed so as to communicate with the greasing portion of the pin connecting portion for the bucket link base end portion, and the grease passage on the other side is formed. The grease passage on the inner side of the idler link is connected to the greasing point of the pin coupling part of the bucket link tip boss via the bucket link base end boss and the grease pipe arranged inside the bucket link. Characteristic bucket link mechanism automatic greasing structure.