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Fan Drive System

a technology of fan drive and drive shaft, which is applied in the direction of positive displacement liquid engine, machine/engine, servomotor, etc., can solve the problems of consuming a lot of space, reducing and limiting the layout degree of the radiator and other devices, so as to prevent the waste of discharge flow rate and reduce the displacement of the hydraulic pump.

Inactive Publication Date: 2010-12-02
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0041]When a load pressure of the working machine is generated in a working machine circuit, the displacement of the variable displacement pump can be controlled using the maximum load pressure among the load pressures of the working machine circuit. Further, it is possible to prevent the load pressure which controls the pump displacement of the variable displacement pump from varying during operation of the working machine, and the working machine can be operated in the stable state.
[0042]Further, the discharge flow rate from the variable displacement pump is not used for the operation of the working machine and it is possible to prevent the discharge flow rate from being consumed wastefully. Since the displacement of the hydraulic pump can be a value required for operating the working machine, the displacement of the hydraulic pump can be reduced.

Problems solved by technology

If the cooling fan is driven directly by the engine, a disposition portion of the cooling fan is limited, and a freedom degree of layout of the radiator and other devices is limited.
In order to newly dispose the hydraulic pump, the layout structure becomes complicated, and a wider installation space is required.
Further, there is a problem that the cost is increased and the number of parts is increased.

Method used

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first embodiment

[0086]A hydraulic circuit having a fan drive system according to the First embodiment of the present invention will be explained using FIGS. 1 and 2. FIG. 1 is a simplified hydraulic circuit diagram and FIG. 2 is a detailed hydraulic circuit diagram. First, the hydraulic circuit having the fan drive system according to the First embodiment of the invention will be briefly explained using FIG. 1 and then, the hydraulic circuit having the fan drive system according to the First embodiment of the invention will be explained using FIG. 2. Numbers of common members in FIGS. 1 and 2 will be explained using the same numbers of members.

[0087]As shown in FIG. 1, a discharge flow rate from a load pressure sensitive variable displacement pump 1 which is driven by an engine (not shown) is discharged to a discharge oil path 51 as a first discharge oil path. The discharge oil path 51 is branched into an oil path 57 as a second discharge oil path. The discharge oil path 51 is connected to a workin...

second embodiment

[0151]A hydraulic circuit having a fan drive system according to the Second embodiment of the present invention will be explained using FIGS. 3 and 4. The Second embodiment has a steering drive circuit in addition to the hydraulic circuit of the First embodiment. Maximum one of load pressures of a steering drive device 30, the lift cylinders 13A and 13B and the tilt cylinders 20A and 20B is used ad a load pressure in the pilot oil path 78 as a first pilot oil path which is led to the shuttle valve 29. In this structure, the Second embodiment is different from the First embodiment, but other structure is the same as that of the First embodiment.

[0152]Therefore, members of the Second embodiment which are the same as those of the First embodiment are designated with the same reference numerals, and explanation thereof will be omitted, and a structure which is different from that of the First embodiment will be explained mainly. The pilot oil path 78 connected to the shuttle valve 29 is...

third embodiment

[0186]FIGS. 5 and 6 show a hydraulic circuit having a fan drive system according to the Third embodiment of the present invention. A circuit structure for leading a load pressure to the pilot oil path 80 in the Third embodiment is different from those of the First and Second embodiments. Other structure is similar to the circuit structure shown in FIG. 2 that is a circuit structure of the First embodiment in FIG. 5, and other structure is similar to the circuit structure shown in FIG. 4 that is a circuit structure of the Second embodiment in FIG. 6

[0187]Concerning FIG. 5 where the priority valve 3 is not disposed, the same structure as that of the First embodiment and the same members of the Third embodiment which are the same as those of the First embodiment are designated with the same reference numerals, and explanation thereof will be omitted. Concerning FIG. 6 where the priority valve 3 is used, the same structure as that of the Second embodiment and the same members of the Thi...

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PUM

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Abstract

A fan drive system for driving an engine cooling fan mounted in a working machine is described. The fan drive system includes a variable displacement pump that supplies oil to an actuator and is also used as a hydraulic pump for the hydraulic motor that drives the cooling fan. A pump displacement of a variable displacement pump can be controlled in accordance with the load of the working machine, and when a load is not generated in the working machine, the pump displacement of the variable displacement pump can be controlled in accordance with a load pressure of a hydraulic motor which drives a cooling fan. Examples of such working machines include a forklift, a skid steer loader (SSL) and a crawler dump.

Description

TECHNICAL FIELD[0001]The present invention relates to a fan drive system which drives an engine cooling fan mounted in a forklift, a skid steer loader (SSL) and a crawler dump which are working apparatuses.BACKGROUND ART[0002]In a conventional working apparatus, an engine thereof is cooled using a water-cool cooling device. That is, the engine is cooled by circulating a coolant through a water jacket provided in an engine body. The coolant heated in the water jacket is led to a radiator and cooled, and the cooled coolant is again returned to the water jacket.[0003]A cooling fan is disposed in front of a radiator, and a coolant passing through the radiator is cooled by wind generated by the cooling fan. Generally, the cooling fan is driven by an engine through a belt. Thus, the number of revolutions of the cooling fan corresponds to the number of revolutions of the engine.[0004]If the cooling fan is driven directly by the engine, a disposition portion of the cooling fan is limited, a...

Claims

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Application Information

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IPC IPC(8): F04B49/00
CPCE02F9/2203E02F9/2228E02F9/2232E02F9/225E02F9/2296F01P7/044F15B11/05F15B11/165F15B11/168F15B2211/20523F15B2211/20553F15B2211/40553F15B2211/6054F15B2211/6343F15B2211/654F15B2211/7058
Inventor KATAOKA, TOYOMIFUKUSHIMA, JUNICHIMARUTA, KAZUHIROISHIZAKI, NAOKI
Owner KOMATSU LTD
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