Lubrication – Systems – With safety or indicating means
Patent
1994-05-26
1996-01-09
Denion, Thomas E.
Lubrication
Systems
With safety or indicating means
184 619, 184 72, 184 6, F01M 118
Patent
active
054821380
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automatic greasing system and an abnormality detecting method therefor for a construction machine, such as a hydraulic excavating machine which is equipped with an earth working machine. The work machine is mounted on an upper swivel body of the excavating machine and comprises working members such as an arm member and an earth working tool, such as a bucket, which are articulation-connected to carry out earth moving work such as excavation by swinging these working members with hydraulic cylinders which are pin-connected between the arm member and the earth working tool.
2. Description of the Related Art
In general, those parts of construction machines, such as hydraulic excavating machines, for which greasing is required, that is, those pin-connected parts of earth working machines, such as an arm member and a bucket, are directly greased by an operator with a grease gun through the end faces of the pins or the bushes and bosses into which the pins are inserted. However, some construction machines are provided with a centralized greasing port for greasing several pin connections by supplying grease to these pin-connected parts. In the case of conventional greasing with the grease gun, the operator has to move about in order to reach the greased parts of the machine, since the greased parts are in dispersed locations. Therefore, it is troublesome for the operator to finish such greasing service. Since greasing is directly performed by the operator with the grease gun in this prior art method, the operator's clothing may become soiled with grease. In addition, as earth and sand are detrimental to machines, construction machines which handle earth and sand should be periodically greased at a greasing interval specified by the manufacturer. If the specified greasing interval is ignored, possible results include seizure of pins and bushes, production of loud sound or noisy rattling sound due to an increase of clearance between pins and bushes resulting from wear, and deterioration of durability due to development of wear caused by mud and sand which have entered into the pin-connected parts. Recently, an automatic greasing system for construction machines (Japanese Patent Application Laid-open No. 190837-1989), as shown in FIG. 12, has also been invented. In FIG. 12, a grease pump 38, connected to a pressure-accumulated grease tank 44, is provided on an upper swivel body 5 of a hydraulic excavating machine 1. A discharging port of the grease pump 38 is connected to a master distribution valve 52, and slave distribution valves 53 and 54 are connected in series to the downstream side of the master distribution valve 52. Each of the diverting ports of the master distribution valve 52 and the slave distributing valves 53 and 54 is connected by a greasing pipe to a respective one of the swivel bearing 3 of the swivel body 4, and the pin-connected parts 12-14, 18, 19, 21, 23, 25, 26, 30, and 31 for the work machine. On the other hand, a controller 20 is provided in an electric circuit which connects a battery 42 and a grease pump drive motor 43, which are located on the hydraulic excavating machine 1. The grease pump drive motor 43 can be operated by the controller 20 when an engine 50 has been operated for a predetermined cumulative time. In addition, when greasing from the master distribution valve 52 and slave distribution valves 53 and 54 to respective pin-connected parts 12-14, 18, 19, 21, 23, 25, 26, 30, and 31 is finished, the grease pump drive motor 43 can be stopped. After lapse of the above-described predetermined cumulative time, the operation of the grease pump 38 can be repeated.
The following describes the operation of the related art shown in FIG. 12. A key switch 48 is turned on and a manual switch 51 is set to the automatic greasing position in advance. When the engine 50 has been operated for the predetermined cumulative time according to a time function of the controller 20, the grease pump drive motor 43 s
REFERENCES:
patent: 3527322 (1970-09-01), Roberts
patent: 4445168 (1984-04-01), Petryszyn
patent: 4520902 (1985-06-01), Snow
patent: 4674030 (1987-06-01), Gabriel et al.
patent: 5244350 (1993-09-01), Yang
Mori Shigeki
Ohbatake Yohjiro
Tsuchie Morio
Denion Thomas E.
Kabushiki Kaisha Komatsu Seisakusho
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