JP4134342B2 - Oil cooler piping structure for construction machinery - Google Patents

Description

  The present invention belongs to the technical field of oil cooler piping structures for construction machines. More specifically, the present invention relates to a piping structure on the supply side and the discharge side of the oil cooler that can swing out.

    Conventionally, the oil cooler has been arranged in a manner to overlap the front surface of the engine radiator with a slight gap. In order to facilitate the piping cleaning of the heat exchange portion of the radiator and the oil cooler, a swing-out method has been conventionally employed that is rotatable about one side of the oil cooler. When the swing-out method is adopted, the structure of the rotating part and the connection structure of the piping for supplying and discharging oil to the oil cooler become problems, and various techniques have been conventionally devised. Hereinafter, these conventional techniques will be described.

4 to 6 show a conventional piping structure described in Patent Document 1 (hereinafter referred to as the conventional apparatus 1). 4 is a front view, FIG. 5 is a plan view in the swing-in state, and FIG. 6 is a plan view when the swing-out is performed. 4 to 6, an oil cooler 13 is attached to the front side of the engine radiator 11 with a small space 12. Both ends of the hinge 15 are fixed to one side of the oil cooler and the same side of the radiator, and the oil cooler 13 is provided so as to be rotatable (swingable). Further, the swivel joint 16 is fixed to the end of the oil cooler by input / output conduits 17a and 17b so that the rotation center axis of the swivel joint 16 is on the same axis as the opening / closing axis of the hinge 15. The supply pipe 18a and the discharge pipe 18b are fixed to the central part of the main body of the swivel joint 16.
Utility Model Gazette No. 8-7058

  The conventional device 1 has the above-described configuration, and the oil cooler 13 is configured to be rotatable by a hinge 15, and the rotation shaft of the swivel joint is provided on the same shaft, and the inlet / outlet conduits 17a and 17b and the supply / discharge tube 18a. , 18b are connected to each other so that the swing-out operation is possible.

7 to 9 show a conventional piping structure described in Patent Document 2 (hereinafter referred to as the conventional device 2). 7 is a front view, FIG. 8 is a plan view, and FIG. 9 is a detailed cross-sectional view of a connection portion. The same components as those in the conventional apparatus 1 are denoted by the same reference numerals. 7 and 8, the input / output conduits 17a and 17b are connected to the oil cooler 13, and the input and output conduits 17a and 17b are connected to the oil passages of the supply pipe 18a and the discharge pipe 18b, respectively. Connection and rotation of the inlet / outlet pipes 17a, 17b and the supply / discharge pipes 18a, 18b are configured as shown in FIG.
Published Patent Publication No. Hei 11-82023

  That is, the ends of the inlet / outlet pipes 17a and 17b are formed to have a thin outer periphery, while the ends of the supply pipe 18a and the discharge pipe 18b have inner diameters that can fit the outer ends of the inlet / outlet pipes 17a and 17b and It is formed to be rotatable. At the same time, the oil cooler 13 is supported by the fitting portion. Further, an oil seal 19 is inserted between the two so that no oil leakage occurs. The conventional device 2 has a configuration in which oil can be supplied to and discharged from the oil cooler 13 and can be swinged out by the fitting portion.

  Since the conventional apparatus 1 uses a swivel joint, there is a problem that the apparatus becomes expensive, and the rotation axis of the hinge and the swivel joint needs to coincide with each other. Although the conventional apparatus 2 does not use a swivel joint, there is a problem that the machining cost is high because the work of the fitting portion requires accuracy. In particular, an attempt to improve the reliability against oil leakage increases the cost, which is a problem. As a device with reduced cost, a device shown in FIGS. 10 to 12 (hereinafter referred to as a conventional device 3) has been conventionally known. The conventional apparatus 3 has a configuration in which rubber hoses 20a and 20b are directly connected to the input / output conduits 17a and 17b, as shown in FIGS.

  The conventional apparatus 3 can be manufactured at low cost. However, when the oil cooler 13 is swung out, the rubber hose 20a (and 20b) is greatly bent (the radius of curvature is small, see FIG. 12), and further, twisting occurs, and the rubber hose 20a is likely to be cracked. was there. In addition, it is necessary to secure a space for bending the rubber hose 20a, which makes it difficult to arrange a compact device, which is a problem.

  Conventional devices 1 and 2 have been problematic because of their high production costs. Further, the conventional device 3 has a problem such as a crack in the rubber hose and a problem that an extra space needs to be secured. The present invention has been made under the background as described above, and an object thereof is to provide a piping structure that is inexpensive and does not cause the above-described problems.

In order to solve the above problems, the present invention employs the following means. That is,
According to the first aspect of the present invention, an oil cooler is provided on a front surface of a radiator or the like in a construction machine such as a hydraulic excavator so as to be able to swing out. In an oil cooler piping structure in which a height difference is provided between an oil outlet pipe and an oil return pipe provided at the lower end of the oil cooler, connecting parts are provided in the oil inlet pipe and the oil supply pipe, and the oil outlet Connecting parts are provided on the pipe and the oil return pipe, and the connecting parts are connected by an elastic hose, the connecting parts of the oil inlet pipe are inclined downward, and the connecting parts of the oil supply pipe are set upward and outward. The oil cooler is provided with an inclination, the connecting part of the oil outlet pipe is inclined upward, the connecting part of the oil return pipe is inclined downward and outward, and the oil cooler is swung out. The elastic hose when the is characterized in that not exceed the boundary surface in contact with the outermost end of the elastic hose in the swing-in state.

  The invention according to claim 2 is provided such that an oil cooler can swing out on the front surface of a radiator or the like in a construction machine such as a hydraulic excavator, between an oil inlet pipe and an oil supply pipe provided at the upper end of the oil cooler, and In an oil cooler piping structure in which a height difference is provided between an oil outlet pipe and an oil return pipe provided at the lower end of the oil cooler, connecting parts are provided in the oil inlet pipe and the oil supply pipe, and the oil outlet Connecting parts are provided on the pipe and the oil return pipe, and the connecting parts are connected by an elastic hose, the connecting parts of the oil inlet pipe are inclined downward, and the connecting parts of the oil supply pipe are set upward and outward. The oil outlet pipe connecting part is provided to be inclined upward, the oil return pipe connecting part is provided to be inclined downward and outward, and the oil cooler swing-in is provided. In maximum bending of the elastic hose in state, the bending is reduced in the elastic hose when swing-out oil cooler, twisting of the elastic hose is characterized in that to fit a predetermined range.

  A third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the connection part is formed by inclining a hose connection part of the connection part in the above-described directions.

  As described below, according to the configuration of the present invention, in the invention according to the first aspect, since the connection parts are tilted in an appropriate direction and are connected using the elastic hose, the manufacturing and assembling operations are performed. In addition to the effect of facilitating, the movement of the elastic hose is suppressed to a predetermined boundary range, so that the effect of facilitating the arrangement of other devices can be obtained. Further, in the invention according to claim 2, since the bending of the elastic hose is suppressed to be small and the twist is also suppressed within a predetermined range, an effect that the life of the elastic hose is extended can be obtained. In the invention according to the third aspect, the effect of facilitating the mounting or manufacturing of the connecting parts can be obtained.

  FIG. 1 is a plan view showing an embodiment of the present invention, showing a swing-in state, and FIG. 2 showing a swing-out state. FIG. 3 shows a front view of the present embodiment. Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, a dust removal net 11 a is provided on the front side of the radiator 11. An oil cooler 13 is disposed in front of the dust removal net 11a. A rotation support component 21 such as a hinge is attached to the left end of the oil cooler 13, and the oil cooler 13 is supported so as to be rotatable about a rotation point 21a. One end of an oil inlet pipe 22a and an outlet pipe 22b is connected to a cooling pipe (not shown) of the oil cooler in the approximate center of the upper end and lower end of the oil cooler 13, and a connecting part 24 for connecting a rubber hose to the other end. Is attached. The oil inlet pipe 22a and the outlet pipe 22b are made of metal pipes or resin pipes.

  One end of the elastic hose 27a (and 27b) such as a rubber hose is connected to the oil inlet pipe 22a (and the outlet pipe 22b) by the connecting member 24a of the connecting part 24, and the other end of the elastic hose 27a (27b) is connected to the connecting part 26. It is connected to an oil supply pipe 25 (and an oil return pipe not shown) via a member 26a. Further, the end of the oil supply pipe 25 (and an oil return pipe not shown) is disposed behind the oil cooler 13 (upward in FIGS. 1 and 2). Therefore, as shown in FIG. 1, in the swing-in state, the elastic hose 27a (and 27b) is connected in a bent state.

  The connecting member 26a on the elastic hose side of the connecting component 26 is fixed at an angle so that the elastic hose 27a (27b) is connected at a predetermined angle. That is, when the oil cooler 13 is swung out, the connecting member 26a is angled so that the elastic hose 27a (27b) does not come out of the predetermined boundary surface 30 (so that it does not enter the left hatched area in the figure). It has been. That is, the connecting part 22a of the oil inlet pipe is inclined downward, the connecting part of the oil supply pipe 25 is inclined upward and outward, and the connecting part of the oil outlet pipe 22b is inclined upward. The connecting parts of the pipe 26 are provided so as to be inclined downward and outward. Further, the vertical distance H between both ends of the elastic hose 27a (and 27b), that is, the connection end of the connection member 24a of the connection component 24 and the connection end of the connection member 26a of the connection component 26 is made as small as possible. Even when the oil cooler 13 is swung out by increasing the overall length of 27a (and 27b), the elastic hose 27a (and 27b) is arranged so that a large torsion over a predetermined value does not occur. The predetermined value is set to an appropriate value less than the allowable value. Further, the predetermined boundary surface refers to a boundary surface where the elastic hose is in contact with the outermost end of the elastic hose in the swing-in state.

  The present embodiment has the above piping structure and functions as follows. That is, the elastic hose 27a (27b) is bent in the swing-in state (the state shown in FIG. 1). However, the degree of bending (maximum curvature) is set to be below an allowable value, and there is no inconvenience such as fatigue or cracking in the elastic hose 27a (27b). In the state where the oil cooler 13 is swinged out (the state shown in FIG. 2), the degree of bending of the elastic hose 27a (27b) is gradually reduced. At this time, the elastic hose 27a (27b) is swung out without entering the outside of the predetermined boundary surface 30 (the hatched portion in FIG. 1). Therefore, other devices can be freely arranged inside the predetermined boundary surface (shaded portion).

  Further, when changing from the swing-in state to the swing-out state, the elastic hose 27a (27b) is gradually twisted. However, in this case, the vertical distance H between the connection ends of the connection members is reduced, and the length of the elastic hose 27a (27b) is long, so even if twisting occurs, the value is sufficiently small ( Inconvenience does not occur because it is taken below the allowable value.

  As described above, according to the present embodiment, since an elastic hose such as a rubber hose is used for the rotating portion of the oil cooler, there is an effect that the manufacturing cost is reduced. In addition, there is an effect that reliability against oil leakage is maintained. Furthermore, since the elastic hose does not enter the inside of the predetermined boundary surface when swinging out, an effect that the space can be made compact in arranging other devices can be obtained. In addition, since the elastic hose is configured so as not to cause a large twist or bend, there is an effect that the life of the apparatus is prolonged.

  The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, the connection part is also included in the technical scope of the present invention when the hose connection part of the connection part is formed to be inclined in the above-described directions.

The top view of the swing-in state in embodiment of this invention is shown. The top view of the state swung out of this embodiment is shown. The front view of this embodiment is shown. The front view of the conventional apparatus 1 is shown. The top view of the swing-in state of the conventional apparatus 1 is shown. The top view of the state which swung out the conventional apparatus 1 is shown. The front view of the conventional apparatus 2 is shown. The top view of the conventional apparatus 2 is shown. The rotation support structure of the conventional apparatus 2 is shown. The front view of the conventional apparatus 1 is shown. The top view of the swing-in state of the conventional apparatus 3 is shown. The top view of the state which swung out the conventional apparatus 3 is shown.

Explanation of symbols

11 Engine radiator 13 Oil cooler 21
Rotating support parts 22a, 22b Oil inlet / outlet pipe 24 Connection part 24a
Connecting member 25
Oil supply pipe 26
Connection part 26a
Connection member 27a, 27b Rubber hose (elastic hose)
30
Interface

Claims (3)

An oil cooler is provided on the front surface of a radiator or the like in a construction machine such as a hydraulic excavator so as to be able to swing out, and is provided between an oil inlet pipe and an oil supply pipe provided at an upper end portion of the oil cooler and at a lower end portion of the oil cooler. In the oil cooler piping structure in which there is a height difference between the oil outlet pipe and the oil return pipe, connecting parts are provided in the oil inlet pipe and the oil supply pipe, and connecting parts are provided in the oil outlet pipe and the oil return pipe. The connecting parts of the oil inlet pipe are inclined downward, the connecting parts of the oil supply pipe are inclined upward and outward, and the oil is connected to each other by an elastic hose. The outlet pipe connecting parts are inclined upward, the oil return pipe connecting parts are inclined downward and outward, and when the oil cooler is swung out, the elastic ho But the oil cooler piping structure for a construction machine characterized in that it did not exceed the boundary surface in contact with the outermost end of the elastic hose in the swing-in state. An oil cooler is provided on the front surface of a radiator or the like in a construction machine such as a hydraulic excavator so as to be able to swing out, and is provided between an oil inlet pipe and an oil supply pipe provided at an upper end portion of the oil cooler and at a lower end portion of the oil cooler. In the oil cooler piping structure in which there is a height difference between the oil outlet pipe and the oil return pipe, connecting parts are provided in the oil inlet pipe and the oil supply pipe, and connecting parts are provided in the oil outlet pipe and the oil return pipe. The connecting parts of the oil inlet pipe are inclined downward, the connecting parts of the oil supply pipe are inclined upward and outward, and the oil is connected to each other by an elastic hose. The outlet pipe connecting part is provided to be inclined upward, the oil return pipe connecting part is provided to be inclined downward and outward, and the elastic hose is moved in the swing-in state of the oil cooler. Rising is at the maximum, with the bending of the elastic hose when swinging out the oil cooler is reduced, the oil cooler piping structure for a construction machine twist elastic hose is characterized in that to fit a predetermined range. 3. The oil cooler piping structure for a construction machine according to claim 1, wherein the connection part is formed by tilting a hose connection part of the connection part in each of the above-described directions.

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