JP2013129996A - Pilot valve attaching structure of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pilot valve attaching structure of a construction machine, capable of reducing an oppressive feeling to an operator sitting in a driver seat.SOLUTION: In the present invention, in the pilot valve attaching structure of a construction machine, which is provided in a mini shovel having an operation device 11 for traveling including a pilot valve 18 and is for attaching the pilot valve 18 to a floor plate 15, a recessed part 20 having a hole 20b to which a casing 18a forming an outer shell of the pilot valve 18 can be inserted at a bottom part 20a is formed on the floor plate 15, the casing 18a of the pilot valve 18 is attached to the bottom part 20a of the recessed part 20 in the state of inserting the casing 18a of the pilot valve 18 in the hole 20b of the recessed part 20, and a mat-like seal member 21 for sealing a gap generated around the casing 18a when the casing 18a of the pilot valve 18 is inserted in the hole 20b of the recessed part 20 is provided.

Description

  The present invention relates to a pilot valve mounting structure for a construction machine, which is provided in a construction machine such as a mini excavator and which is mounted on a floor plate with a pilot valve included in a traveling operation device arranged at a front position of a driver's seat.

  There exists a thing shown by patent document 1 as this kind of prior art. This prior art has a configuration in which a pilot valve included in a traveling operation device provided in a hydraulic excavator having a traveling body, a revolving body, and a working device is attached to a flat driver seat floor, that is, a floor plate. is there.

JP 2011-64064 A

  Since the above-described prior art has a configuration in which the pilot valve is attached to a flat floor plate, the height of the pilot valve portion protruding upward from the floor plate is increased. As a result, the operation space of the traveling operation device formed on the front side of the driver's seat tends to be narrowed, and it is easy to give a feeling of pressure to the operator sitting in the driver's seat. This is particularly remarkable in a mini excavator or the like in which the construction machine provided with the pilot valve is a small machine and the manufacturing of the machine is easily restricted by the size of the operation space of the traveling operation device.

  The present invention has been made from the above-described prior art, and an object of the present invention is to provide a pilot valve mounting structure for a construction machine that can reduce a feeling of pressure on an operator sitting in a driver's seat.

  In order to achieve this object, the present invention includes a traveling body, a revolving body disposed on the traveling body, and a work device attached to the revolving body, and a floor formed on the revolving body. A construction machine having a driver's seat on a plate and having a traveling operation device including a pilot valve at a position in front of the driver's seat is attached to the floor plate with the pilot valve included in the traveling operation device. In the pilot valve mounting structure for a construction machine, the floor plate is formed with a recess having a bottom hole into which a casing forming the outer shell of the pilot valve can be inserted, and the pilot valve is formed in the hole of the recess. With the casing inserted, the casing of the pilot valve is attached to the bottom of the recess, and the recess It is characterized by having a mat-like seal member for sealing a gap formed around the casing when obtained by inserting the casing of the pilot valve in said hole.

  In the present invention configured as described above, since the pilot valve casing is attached to the bottom of the concave portion of the floor plate, the pilot valve casing is arranged so that the upper surface of the pilot valve protruding from the upper surface of the floor plate is lowered. Can be attached to the floor plate. In addition, since the recesses are formed in the floor plate in this way, there is a concern that contaminants such as mud and muddy water may enter the pilot valve through the recesses. The mat-like sealing member that seals the gaps generated around can prevent contaminants such as mud and muddy water from entering the pilot valve.

  Further, the present invention is characterized in that, in the above invention, the mat-like sealing member is made of a rubber member. The present invention configured as described above can be easily attached to and detached from the concave portion of the floor plate by utilizing the elasticity of the mat-shaped seal member so as to bend the mat-shaped seal member.

  The present invention is also characterized in that, in the above invention, the mat-like seal member is composed of a first divided member and a second divided member which are formed so as to be separated from each other and sandwich the casing of the pilot valve. Yes. In the present invention configured as described above, the mat-shaped seal member is divided into the first divided member and the second divided member and separated from each other, so that the work of arranging the mat-shaped seal member around the pilot valve is easy. Can be done.

  Further, the present invention is characterized in that, in the above invention, the mat-shaped sealing member has a protrusion at a lower portion and a hole into which the protrusion is fitted at the bottom of the recess. In the present invention configured as described above, the mat-shaped seal member can be easily positioned in the recess by fitting the protrusion of the mat-shaped seal member into the hole in the bottom of the recess of the floor plate. The mat-like seal member attached to the concave portion of the plate can be kept stable without being displaced with respect to the concave portion.

  Further, in the present invention, the mat-shaped seal member according to the above-described invention, the upper surface of the mat-shaped seal member is substantially flush with the upper surface of the floor plate, and is higher than the upper surface of the floor plate. It is characterized by being attached to the recess. In the present invention configured as described above, the mat-like sealing member is attached to the recess so as to be substantially flush with the floor plate and at a height higher than the upper surface of the floor plate, so that contaminants such as mud and muddy water enter the recess. It is difficult to flow in, and it is possible to reliably prevent this contaminant from entering the pilot valve.

  In the present invention, since the pilot valve is attached to the recess formed in the floor plate, the portion of the pilot valve protruding from the floor plate can be made lower than before, and it is easy for the operator sitting in the driver's seat to receive it conventionally. A feeling of pressure generated in a limited operation space can be reduced. As a result, more comfortable operability than conventional can be ensured. Further, the present invention can prevent intrusion of contaminants such as mud and muddy water into the pilot valve by the mat-like sealing member that seals the gap around the pilot valve, maintaining good performance of the pilot valve, In addition, ensuring of excellent durability can also be realized.

It is a side view which shows the mini excavator mentioned as an example of the construction machine with which one Embodiment of the pilot valve attachment structure which concerns on this invention is provided. It is a perspective view which shows the arrangement | positioning part of the driver's seat with which the mini excavator shown in FIG. 1 is equipped. FIG. 3 is an enlarged perspective view of a main part of the state shown in FIG. 2 excluding an operation pedal and the like. It is the perspective view which looked at the location shown in FIG. 3 from another angle. It is a figure explaining the relationship between depression operation of an operation pedal, and the height of the casing of a pilot valve. It is a figure which shows the mat-shaped sealing member with which this embodiment is equipped, (a) A figure is the perspective view seen from the front side, (b) The figure is a perspective view seen from the back side. It is a figure which shows the mounting relationship of the mat-shaped sealing member and floor plate with which this embodiment is equipped, (a) A figure is a perspective view which shows the state before mounting | wearing a mat-shaped sealing member to a floor plate, (b) The figure is It is a perspective view which shows a state when a mat-shaped sealing member is mounted on the floor plate. It is a perspective view which shows the state which remove | excluded the mat-shaped sealing member from the state shown in FIG. It is a top view which shows the part of the floor plate except the mat-shaped sealing member with which this embodiment is equipped. FIG. 10 is an enlarged cross-sectional view of FIG. 9A. FIG. 10 is an enlarged view of a B cross section in FIG. 9. FIG. 11 is a cross-sectional side view of a main part in which the mat-like seal member according to the present embodiment is mounted in the state shown in FIG. 10.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a construction machine pilot valve mounting structure according to the present invention will be described with reference to the drawings.

  The construction machine provided with the pilot valve mounting structure according to the present invention is, for example, a mini excavator that constitutes a small machine and has a relatively narrow operation space of an operation device disposed in a cab. As shown in FIG. 1, this mini excavator includes a traveling body 1, a revolving body 2 disposed on the traveling body 1, and a work device 3 that is attached to the revolving body 2 and is rotatable in the vertical direction. And have. The work device 3 includes a boom 4 attached to the revolving structure 2, an arm 5 attached to the tip of the boom 4, and a bucket 6 attached to the tip of the arm 5. A cab 7 and a counterweight 8 for ensuring a weight balance are arranged on the revolving structure 2. A machine room 9 in which an engine, a hydraulic pump and the like are accommodated is disposed between the cab 7 and the counterweight 8. A driver's seat 10 on which an operator is seated is disposed in the driver's cab 7, and a traveling operation lever 16, an operation pedal 17, and a pilot valve 18 are provided at a position in front of the driver's seat 10 as shown in FIG. 2. A traveling operation device 11 is disposed. Work operation devices 10 a and 10 b are arranged on both sides of the driver's seat 10.

  In the pilot valve mounting structure according to the present embodiment, as shown in FIGS. 7 to 11 and the like, a hole 20b into which a casing 18a that forms the outer shell of the pilot valve 18 can be inserted in the floor plate 15 of the cab 7 at the bottom. A recess 20 is formed in 20a. As shown in FIGS. 10 and 11, the casing 18 a of the pilot valve 18 is attached to the bottom 20 a of the recess 20 with the casing 18 a of the pilot valve 18 inserted into the hole 20 b of the recess 20.

  Further, in this embodiment, as shown in FIGS. 3 to 5 and 12, a mat-like sealing member 21 that seals a gap generated around the casing 18 a when the casing 18 a of the pilot valve 18 is inserted into the hole 20 b of the recess 20. It has. The mat-like seal member 21 is made of, for example, a rubber member. As shown in FIGS. 4 and 6, the mat-shaped sealing member 21 includes a first divided member 21a and a second divided member 21b which are formed so as to be separated from each other and sandwich the casing 18a of the pilot valve 18. It is made up.

  As shown in FIG. 6B and FIG. 7, the mat-shaped sealing member 21 has a protruding portion 22 in the lower portion, and a hole portion into which the protruding portion 22 is fitted into the bottom portion 20 a of the recessed portion 20. 23. Further, as shown in FIG. 5, the mat-shaped sealing member 21 is formed so that the upper surface thereof is substantially flush with the upper surface of the floor plate 15 and is higher than the upper surface of the floor plate 15. It is attached to the recess 20.

  As shown in FIG. 5, the height of the pilot valve 18 attached to the recess 20 of the floor plate 15 is such that the height position from the floor plate 15 to the upper surface of the casing 18a of the pilot valve 18 is on the driver's seat 10. When the operator who has sat down steps on the operation pedal 17, the shoe 30a of the operator's shoe 30 is set at a relatively low height position H within a range where the shoe 30a does not contact the floor plate 15. This height position H is, for example, around 20 mm.

  In the mini excavator provided with the pilot valve mounting structure according to the present embodiment, the operator sitting in the driver's seat 10 operates the operation devices 10a and 10b for work shown in FIG. Alternatively, it is possible to perform excavation work of earth and sand through the bucket 6 by rotating the working device 3 in the vertical direction. Further, when an operator sitting in the driver's seat 10 operates the operation lever 16 of the travel operation device 11 or depresses the operation pedal 17 with shoes, the pilot valve 18 is activated and the travel direction control valve (not shown) is illustrated. Is switched, and the pressure oil from the hydraulic pump accommodated in the machine room 9 is supplied to the left and right traveling motors via the traveling direction control valve so that the traveling body 1 can travel.

  In the pilot valve mounting structure according to this embodiment configured as described above, since the casing 18a of the pilot valve 18 is mounted on the bottom 20a of the recess 20 of the floor plate 15, the pilot protruding from the upper surface of the floor plate 15 is provided. The casing 18a of the pilot valve 18 can be attached to the floor plate 15 so that the upper surface of the valve 18 is lowered. As a result, it is possible to reduce a feeling of pressure generated in a limited narrow operation space that is easily received by an operator sitting in the driver's seat 10, and to ensure comfortable operability.

  Further, since the recess 20 is formed in the floor plate 15, dirt such as mud adhering to an operator's shoes or mud water generated when the mud is washed out enters the pilot valve 18 through the recess 20. However, in this regard, the mat-like seal member 21 that seals the gap generated around the casing 18a of the pilot valve 18 prevents the entry of contaminants such as mud and muddy water into the pilot valve 18. can do.

  Further, in this embodiment, since the mat-like seal member 21 is made of a rubber member, the mat-like seal member 21 is bent by using the elasticity of the mat-like seal member 21 so as to be recessed. 20 can be easily attached and detached.

  Further, in the present embodiment, the mat-like seal member 21 is divided into the first divided member 21a and the second divided member 21b and separated from each other, so that the mat-like seal member 21 is placed around the casing 18a of the pilot valve 18. The arrangement | positioning work can be performed easily.

  Further, according to the present embodiment, the mat-like seal member 21 can be easily positioned in the recess 20 by fitting the protrusion 22 of the mat-like seal member 21 into the hole 23 of the floor plate 15, and the floor plate The mat-like seal member 21 attached to the 15 recesses 20 can be kept stable without being displaced with respect to the recesses 20.

  In the present embodiment, the mat-like sealing member 21 is formed in the recess 20 so that the upper surface thereof is substantially flush with the upper surface of the floor plate 15 and is higher than the upper surface of the floor plate 15. Since the attachment is made, contaminants such as mud and muddy water do not easily flow into the recess 20, and entry of the contaminants into the pilot valve 18 can be reliably prevented.

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 3 Working apparatus 10 Driver's seat 11 Traveling operation apparatus 15 Floor plate 18 Pilot valve 18a Casing 20 Recessed part 20a Bottom part 20b Hole 21 Mat-shaped sealing member 21a First divided member 21b Second divided member 21c Hole 22 Part 23 Hole

Claims (5)

A traveling body, a revolving body disposed on the traveling body, and a working device attached to the revolving body, and having a driver seat on a floor plate formed on the revolving body, the driver seat Provided in a construction machine having a traveling operation device including a pilot valve at a forward position of
In the pilot valve mounting structure of the construction machine in which the pilot valve included in the traveling operation device is mounted on the floor plate,
Formed in the floor plate is a recess having a hole in the bottom that allows insertion of a casing forming the outer shell of the pilot valve,
With the casing of the pilot valve inserted into the hole of the recess, the casing of the pilot valve is attached to the bottom of the recess,
A pilot valve mounting structure for a construction machine, comprising a mat-like seal member that seals a gap generated around the casing when the casing of the pilot valve is inserted into the hole of the recess. The pilot valve mounting structure for a construction machine according to claim 1,
The construction valve for pilot valve mounting structure, wherein the mat-like seal member is made of a rubber member. The pilot valve mounting structure for a construction machine according to claim 2,
The pilot valve mounting structure for a construction machine, wherein the mat-shaped seal member includes a first divided member and a second divided member which are formed so as to be separated from each other and sandwich the casing of the pilot valve. The pilot valve mounting structure for a construction machine according to claim 3,
A pilot valve mounting structure for a construction machine, comprising: a protrusion on a lower portion of the mat-like seal member; and a hole into which the protrusion is inserted into the bottom of the recess. The construction machine pilot valve mounting structure according to claim 4,
The mat-like seal member is attached to the recess so that the upper surface thereof is substantially flush with the upper surface of the floor plate and is at a height higher than the upper surface of the floor plate. Pilot valve mounting structure for construction machinery.