JP2009257473A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve work efficiency by facilitating supplying and delivering work of working fluid to a working fluid tank mounted on a working vehicle such as a crawler tractor or a construction machine. <P>SOLUTION: In the working vehicle equipped with working fluid supply pipes 14, 15 and 16 for supplying the working fluid to a hydraulic device on a lower part of the working fluid tank 12 and a connection part 17 of a working fluid circulation pipe for circulating return oil from the hydraulic device on an upper part of the working fluid tank 12, one end of a hose 23 is connected to the connection part 17, and the working fluid can be supplied from the other end of the hose 23 to the working fluid tank 12, and at the time, the working fluid can be supplied through a return filter 27 connected to the connection part 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a work vehicle such as a crawler tractor or a construction machine provided with a hydraulic oil tank that supplies hydraulic oil to a hydraulic device and recirculates return oil from the hydraulic device.

Conventionally, in a construction machine that is an example of a work vehicle, a hose is connected to a drain hole formed in a bottom surface of a hydraulic oil tank that stores hydraulic oil for a hydraulic device, and a front end side of the hose is a free end. By providing a cock that is an opening / closing mechanism at the tip, the operator can pull the tip of the hose to an arbitrary position without entering the vehicle. A system that facilitates the operation of discharging hydraulic oil is known (see, for example, Patent Document 1).
JP 2007-162248 A (page 3, FIG. 1 to FIG. 2)

However, in Patent Document 1, when repairing the hydraulic device or when the hydraulic oil has deteriorated and the hydraulic oil has to be replaced, a dedicated instrument or handwheel for supplying the hydraulic oil to the hydraulic oil tank is used. A hydraulic oil supply means must be provided separately to prepare a pump or to remove the cover that is screwed to close the filter insertion port at the top of the hydraulic oil tank so that hydraulic oil can be supplied from this filter insertion port. Workability was bad.
In addition, when using hydraulic oil supply means prepared separately as described above, the oil remaining after another oil supply using that means may be supplied to the hydraulic oil tank. There is a possibility that a problem such as mixing different oils in the hydraulic oil in the oil tank or mixing dust will occur.

The present invention aims to solve the above-mentioned problems, and connects one end of a hose to a connecting portion of a hydraulic oil tank mounted on the airframe, and operates from the other end of the hose toward the hydraulic oil tank. The first feature is that the oil can be supplied.
The connecting portion is configured as a joint portion for returning the return oil from the hydraulic device to the hydraulic oil tank, and the return oil reaching the connecting portion or the hydraulic oil supplied from the hose is a filter provided subsequently. The second feature is that the hydraulic oil tank is recirculated or supplied to the hydraulic oil tank.
In addition, the other end of the hose is connected to a stop valve that is normally provided in the oil drain hole of the hydraulic oil tank, and one end of the hose is opened when one end of the hose is removed from the connection portion and the stop valve is opened. The third feature is that the hydraulic oil can be discharged outside the machine.

According to the first aspect of the present invention, one end of the hose is connected to the connecting portion of the hydraulic oil tank, and the hydraulic oil can be supplied from the other end of the hose toward the hydraulic oil tank. When repairing or when the hydraulic oil has deteriorated and it must be replaced, remove the lid that closes the filter insertion port at the top of the hydraulic oil tank, and use the supply means separately prepared from here. The working oil can be easily supplied using the hose without supplying the oil.
And according to invention of Claim 2, the said connection part was comprised by the joint part which recirculates the return oil from a hydraulic apparatus to a hydraulic-oil tank, and was supplied from the return oil which reached this connection part, or a hose The hydraulic oil is configured to be recirculated or supplied to the hydraulic oil tank through a filter that is subsequently provided. Particularly, when the hydraulic device is repaired, the hydraulic oil once discharged from the hydraulic oil tank is the hose. If the oil is supplied again to the hydraulic oil tank, the dust in the hydraulic oil can be captured simultaneously with the supply of the hydraulic oil through the filter.
According to the invention of claim 3, the other end of the hose is normally connected to a stop valve provided in the oil drain hole of the hydraulic oil tank, and one end of the hose is removed from the connecting portion to open the stop valve. In this case, the hydraulic oil can be discharged from the one end of the hose to the outside of the machine, and the oil can be drained from the hydraulic oil tank without contaminating the machine body and the work area. Further, since the hydraulic oil can be supplied to the hydraulic oil tank and discharged from the hydraulic oil tank with one hose, the hydraulic oil supply / discharge device can be configured at low cost.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an agricultural crawler tractor 1 that is a work vehicle according to the present invention. The crawler tractor 1 includes a bonnet 4 that houses an engine 3 on a body frame 2 in the same manner as a normal agricultural tractor, The cabin 5 is provided with a control section 6 in which various operating levers and switches are arranged, including a seat (not shown) on which an operator is seated.

  A three-point link type work machine lifting device 7 on which a work machine for performing various operations is mounted is always installed in the lower rear part of the cabin 5. 8L and 8R are a pair of left and right crawler type traveling devices, and the body frame 2 is supported on the crawler type traveling devices 8L and 8R.

  In addition, left and right steps 9L and 9R are provided above the crawler type traveling devices 8L and 8R at the lower left and right sides of the cabin 5 as a foothold when an operator gets into the crawler tractor 1, and these left and right steps 9L and 9R are provided. A fuel tank 11 that stores fuel for the engine 3 and a hydraulic oil tank 12 that stores hydraulic oil for the hydraulic device are mounted on the rear body frame 2 in a left-right manner.

  More specifically, the hydraulic oil tank 12 is formed by integrating a plurality of metal plates as shown in a rear view shown in FIG. 2 and a side view (viewed in the direction of arrow A in FIG. 2) viewed from the inside of the machine body as shown in FIG. It has a substantially trapezoidal box shape formed by welding. That is, the outer shape of the fuel tank 12 is such that the front surface 12F is inclined downward and the outer surface 12S is inclined downward.

  In the lower part of the hydraulic oil tank 12, the hydraulic oil in the hydraulic oil tank 12 filtered through the suction filter 13 is fed to the left and right traveling continuously variable transmissions (traveling HST) for driving the crawler type traveling devices 8L and 8R. ) Hydraulic oil supply pipe (suction) that is supplied to a hydraulic pump such as a charge pump provided integrally with the hydraulic pump, a gear pump for a work machine that operates a lift cylinder and a lift rod cylinder that are hydraulic actuators of the work machine lifting device 7 Pipes) 14, 15 and 16 are provided.

  On the other hand, in the upper portion of the rear surface 12B of the hydraulic oil tank 12, an operation for returning the excess oil of the left and right traveling continuously variable transmissions and a return oil from a control valve such as a hydraulic actuator for operating the work implement lifting device 7 is performed. A connection part (return block) 17 for the oil reflux pipe is provided, and a connection pipe 18 extended from the connection part 17 is communicated with a return filter unit 19 provided at the upper part of the hydraulic oil tank 12.

  A drain connector 21 connected to a drain hole (not shown) is provided at the bottom of the rear side of the hydraulic oil tank 12, and one end (lower end) of the hose 23 is connected via a stop valve 22 attached to the drain connector 21. At the same time, the other end (upper end) of the hose 23 is connected to an oil supply connector (joint portion) 24 attached to the connection portion 17 of the hydraulic oil return pipe. Reference numeral 25 in the drawing denotes an oil level gauge that allows the amount of hydraulic oil stored in the hydraulic oil tank 12 to be visually confirmed.

  And according to the structure of the hydraulic oil tank 12 demonstrated above, the upper end of the hose 23 connected with the connection part 17 of the hydraulic oil return pipe provided in the rear surface 12B upper part of the hydraulic oil tank 12 via the oil supply connector 24. First, it is confirmed that the stop valve 22 is securely closed. Thereafter, the upper end of the hose 23 is removed from the fuel supply connector 24, and the free end (upper end) side of the hose 23 is shown in FIG. Thus, the hose 23 can be used as a hydraulic oil discharge hose by tilting the crawler traveling device 8R to a state where it abuts against the crawler 26. During this oil draining operation, the upper portion of the hydraulic oil tank 12 is ventilated through the oil supply connector 24 and the connection portion 17 of the hydraulic oil recirculation pipe, and the hydraulic oil is prevented from being scattered by an appropriate opening / closing operation of the stop valve 22. The oil can be collected in an oil pan (not shown), and the hydraulic oil can be discharged to a position away from the machine body, so that a clean oil discharge operation can be performed without contaminating the machine body and the vicinity of the work place.

  On the other hand, as shown in FIG. 5, when removing the lower end of the hose 23 from the stop valve 22, first confirm that the stop valve 22 is securely closed, and then remove the lower end of the hose 23 from the stop valve 22. Then, when the free end of the hose 23 is lifted as shown in the figure, the hose 23 can be used as a hydraulic oil supply hose using a funnel or the like (not shown). When repairing a hydraulic device such as a gear pump or when the hydraulic oil has deteriorated and the hydraulic oil has to be replaced, the lid that closes the filter insertion port at the top of the hydraulic oil tank 12 is removed and prepared separately from here. The working oil can be easily supplied using the hose 23 without supplying the operating oil using the supplying means.

  As described above, when the hose 23 is used as a hydraulic oil supply hose, the hose 23 is extended from the return filter 27 built in the return filter unit 19 in the hydraulic oil tank 12, that is, from the connecting portion 17 of the hydraulic oil return pipe. Since the hydraulic oil is supplied through the return filter 27 that follows the connecting pipe 18, the hydraulic oil discharged from the hydraulic oil tank 12 is used for repairing a hydraulic device such as a charge pump or a work equipment gear pump. If the hydraulic oil is supplied again to the hydraulic oil tank 12 through the hose 23, the dust in the hydraulic oil can be captured simultaneously with the supply of the hydraulic oil through the return filter 27. The hydraulic oil may be supplied to the hydraulic oil tank 12 by connecting a gear pump or the like to the free end of the hose 23. According to the hose 23 described above, the hydraulic oil can be supplied to the hydraulic oil tank 12 and discharged from the hydraulic oil tank 12 with a single hose. be able to.

  Further, as shown in FIG. 3, a breather hole H for maintaining an equilibrium between the internal pressure and the external pressure of the hydraulic oil tank 12 is provided in the oil supply connector (joint portion) 24 attached to the connection portion 17 of the hydraulic oil return pipe. The breather hole H may be inserted into the breather hole H only when the hose 23 is used as a hydraulic oil supply hose. Since it can form without adding components, there exists an advantage which can be comprised simply and cheaply.

  The oil level gauge 25 that can visually recognize the amount of the hydraulic oil stored in the hydraulic oil tank 12 is relatively small, and only the predetermined height range in the upper part of the hydraulic oil tank 12 is used. Although the state cannot be confirmed, if a transparent hose is employed as the hose 23 described above, it is possible to confirm foreign matters such as metal powder contained in the hydraulic oil in a wide range from the bottom to the top of the hydraulic oil tank 12. become able to.

The top view of a crawler tractor. The rear view of a hydraulic oil tank. The side view seen from the airframe inner side of a hydraulic oil tank (A arrow line view in FIG. 2). The rear view of the hydraulic-oil tank which shows a hydraulic-oil discharge | emission state. The rear view of the hydraulic-oil tank which shows a hydraulic-oil supply state.

Explanation of symbols

12 Hydraulic oil tank 17 Connection 22 Stop valve 23 Hose 27 Filter

Claims (3)

  One end of the hose (23) is connected to the connecting portion (17) of the hydraulic oil tank (12) mounted on the airframe, and hydraulic oil can be supplied from the other end of the hose (23) toward the hydraulic oil tank (12). A work vehicle characterized by being configured as follows.   The connecting portion (17) is configured as a joint portion for returning the return oil from the hydraulic device to the hydraulic oil tank (12), and is supplied from the return oil or the hose (23) reaching the connecting portion (17). The working vehicle according to claim 1, wherein the working oil is configured to be recirculated or supplied to the working oil tank (12) through a filter (27) provided subsequently.   The other end of the hose (23) is normally connected to a stop valve (22) provided in the oil drain hole of the hydraulic oil tank (12), and one end of the hose (23) is removed from the connection portion (17). The operation according to claim 1 or 2, wherein when the stop valve (22) is opened, the hydraulic oil can be discharged from one end of the hose (23) to the outside of the machine. vehicle.

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