CN105637151B

CN105637151B - Hydraulic excavator

Info

Publication number: CN105637151B
Application number: CN201580002197.5A
Authority: CN
Inventors: 渡边馨
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2021-03-26
Anticipated expiration: 2035-09-30
Also published as: DE112015000160B4; CN105637151A; WO2016043345A1; JP6023913B2; DE112015000160T5; JPWO2016043345A1

Abstract

A hydraulic excavator (1) having a head cover (34), the hydraulic excavator (1) comprising: electrical components (E1, E2) disposed behind the seat back (35A); a cover (39) that covers the electrical components (E1, E2); and a bracket (55) that is inserted through an opening (39C) provided in the cover (39), the front end side of which faces the back surface of the seat back (35A) on the outside of the cover (39), and the base end side of which is attached to the support frame (51) on the inside of the cover (39).

Description

Hydraulic excavator

Technical Field

The present invention relates to a hydraulic excavator.

Background

Conventionally, a roof-type hydraulic excavator that an operator manipulates in a state of opening to the outside is known as a small-sized hydraulic excavator (for example, see patent document 1). In recent years, in such a hydraulic excavator, information from various sensors provided in a main part of a vehicle body is acquired through a vehicle body network and processed, and the result is displayed on a display, or the information is transmitted to a management center by radio, or necessary information is received from the management center. Therefore, the hydraulic excavator is equipped with electrical components including a processing device and a communication terminal.

Due to the restriction of the mounting space on the vehicle body, such electric components are mounted so as to be gathered between the left and right pillars constituting the roof cover behind the operator seat. Further, since it is necessary to protect the electrical components from rain water and dust, a cover for covering the electrical components from above is provided between the pillars.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open No. 2005-350911

Disclosure of Invention

Problems to be solved by the invention

However, since the cover covering the electrical components is fixed to the vehicle body only by bolts or the like, it is determined that the cover can be easily removed, and thus there is a possibility that expensive electrical components are stolen.

The invention aims to provide a hydraulic excavator capable of inhibiting the theft of electric components.

Means for solving the problems

A hydraulic excavator according to the present invention is a hydraulic excavator having a roof, the hydraulic excavator including: an electrical component arranged behind the seat back; a cover that covers the electrical component; and a bracket that is inserted through an opening provided in the cover, and whose front end side faces a back surface of the seat back on an outer side of the cover, and whose base end side is attached to a support frame on an inner side of the cover.

According to the present invention, in order to detach the cover for covering the electrical components, it is necessary to pull out the cover from the bracket inserted into the opening portion, in addition to loosening the conventionally used bolt or the like. At this time, the portion of the bracket opposed to the seat back is positioned between the seat back and the cover, and therefore the presence of the bracket itself is not easily found. Therefore, the cover cannot be removed by simply loosening the bolts or the like, and theft of the electric device can be suppressed.

In the hydraulic excavator according to the present invention, it is preferable that a rear surface of the seat back abuts on a front end of the bracket.

In the hydraulic excavator according to the present invention, it is preferable that the bracket includes a first member on a proximal end side and a second member on a distal end side joined to the first member by a bolt, and a head of the bolt is located inside the cover.

In the hydraulic excavator according to the present invention, it is preferable that the support frame includes a partition plate that partitions a space inside the cover, one space partitioned by the partition plate communicates with the outside via the opening, and the electrical component is located in the other space.

Drawings

Fig. 1 is a side view of a hydraulic excavator according to an embodiment of the present invention.

Fig. 2 is a plan view showing a cab of the hydraulic excavator.

Fig. 3 is a perspective view showing a cover and an electric component mounted on the hydraulic excavator.

Fig. 4 is a sectional view of the cap, which is a sectional view of arrows IV-IV of fig. 3.

Detailed Description

[ schematic Structure of Hydraulic shovel ]

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a side view showing a hydraulic excavator 1 according to the present embodiment. In fig. 1, a hydraulic excavator 1 includes: a crawler-type lower traveling body 2 driven by a hydraulic motor; an upper revolving structure 3 rotatably provided on an upper portion of the lower traveling structure 2; the hydraulic excavator 1 is configured as a small-sized hydraulic excavator, and the work implement 4 is provided on the front side of the upper revolving structure 3 and performs excavation of earth and sand.

The upper slewing body 3 includes a slewing frame 31 provided with a not-shown slewing hydraulic motor at substantially the center. The revolving frame 31 is provided with the work implement 4, a cab 32 for an operator to ride in, and a counterweight 33 in this order from the front side toward the rear side. In addition, revolving frame 31 is provided with a roof 34 that covers cab 32 from above.

Here, the top cover 34 includes: a pair of columns 34A vertically provided on the left and right; a roof 34B supported by the upper ends of the pillars 34A. The lower end of the column 34A is supported by a support plate 33A located at the upper part of the engine, not shown. Such a support plate 33A is erected between upper ends of left and right support columns 33B erected on the counterweight 33.

Although not shown, a control valve for distributing pressure oil pumped by a hydraulic pump driven by an engine to lower traveling body 2 and work implement 4 is disposed below cab 32 of revolving frame 31. Tanks such as a fuel tank, a hydraulic oil tank, and a sub-tank for engine coolant are disposed on the right side of the cab 32. In the present embodiment, the front, rear, left, and right directions are directions based on an operator seated in the cab 32.

The working device 4 includes: a boom 41 attached to revolving frame 31 so as to be swingable up and down; an arm, not shown, attached to the tip of the boom 41 so as to be swingable up and down; and a bucket, not shown, attached to the tip of the arm so as to be swingable up and down. The boom 41, the arm, and the bucket are connected to the tips of piston rods of the boom cylinder 41A, the arm cylinder, and the bucket cylinder, which are hydraulic cylinders, respectively, and the piston rods are extended and contracted by pressure oil from a control valve to swing.

In the present embodiment, which is a small-sized hydraulic excavator 1, a blade 42 is provided as a separate work implement at the front portion of the frame 21 of the lower traveling structure 2. The blade 42 is operated by a blade cylinder not shown. The blade cylinder is also extended and retracted by pressure oil from the control valve.

[ Structure of cab ]

Fig. 2 shows a plan view of the cab 32 of the hydraulic excavator 1. In fig. 1 and 2, the cab 32 is provided with: an operator seat 35 disposed substantially at the center; control boxes 36 disposed on the left and right of the operator seat 35; a work implement lever 37 provided at the front of each control box 36; a pair of travel levers 38 positioned in front of the operator seat 35 and protruding from the underfoot floor surface; a cover 39 disposed behind the seat back 35A of the operator seat 35, and electrical components E1, E2 and the like disposed behind the seat back 35A and covered by the cover 39.

The operator seat 35 includes a reclining mechanism, and the seat back 35A can be tilted forward and backward. The cover 39 covers the electrical components E1, E2, and the like, and protects them from rain water and dust. The electrical components E1 and E2 include a processing device that processes information from various sensors provided in the main portion of the vehicle body, a communication terminal that communicates with a management center, and the like, and are provided on the support plate 33A, for example.

[ Structure of cover ]

Fig. 3 shows a perspective view of the cover 39. In fig. 2 and 3, the cover 39 is made of synthetic resin. The cover 39 has a left end located inside the column 34A of the top cover 34 and a left concave portion 39A recessed rightward so as to avoid the column 34A. On the other hand, the right end of the cover 39 surrounds the outside of the post 34A, and has a right concave portion 39B recessed from the front to the rear so as to avoid the post 34A. The cover 39 is lower at both sides, and conversely, the center portion between the posts 34A is raised upward, and the electrical components E1 and E2 are covered by the raised portions.

The front surface portion of the bulging portion is provided adjacent to the seat back 35A of the operator seat 35, and a substantially rectangular opening portion 39C having a predetermined opening area is provided on a position on the left side of the front surface portion. A bracket 55 is inserted through the opening 39C, and the bracket 55 will be described later. The cover 39 is attached to the support plate 33A (see fig. 1) and the like by a pair of bolts 39D inserted through positions separated from each other in the left-right direction along the rear end edge and a bolt 39D inserted through the front side of the beverage can rest 39E provided on the right side.

As the bolt 39D, a general bolt having a hexagonal head may be used, but it is preferable to use at least 1 bolt having a head of a special shape. Thus, the cover is not easily detached, and the theft prevention effect of the electrical components E1 and E2 is improved.

[ Structure for supporting Electrical Components ]

As shown in fig. 2 and 3, the electrical components E1 and E2 are supported by the support plate 33A (see fig. 1) and the like via a support frame 51 made of a metal plate or the like. The support frame 51 includes: a base plate 52 fixed to the support plate 33A; a mounting plate 53 erected on the base plate 52 so that the front and back surfaces thereof face forward and backward; a partition plate 54 erected near the left side of the base plate 52 so that the front and back surfaces thereof face left and right; and a bracket 55 provided on the left side surface of the partition plate 54.

A seal 56 made of urethane resin or the like is attached to the outer edges of the base plate 52 and the partition plate 54, and an electrical component E1 is attached to the front surface of the mounting plate 53, while an electrical component E2 is attached to the rear surface. The partition plate 54 partitions the inner space of the bulging portion of the cover 39 into right and left. The space on the left side partitioned by the partition plate 54 communicates with the outside via the opening 39C. The electrical components E1, E2 are located in the space on the right side.

In a state where the electrical components E1, E2 are covered with the cover 39, a gap between the outer edge of the partition plate 54 and the inner surface of the bulging portion of the cover 39 is closed by the seal 56 attached to the partition plate 54. Thus, even if sand, dust, rain water, or the like enters the cover 39 through the opening 39C, the sand, dust, rain water, or the like does not reach the right space, and the electrical components E1 and E2 are not affected.

[ detailed Structure of bracket ]

The bracket 55 includes: a first member 551 provided in an L-shape and joined to the partition plate 54 at a base end side by welding or the like; and a second member 552 on the tip end side joined to the first member 551 by the bolt 55A and the nut 55B. Wherein the second member 552 further comprises: a mounting piece 553 having an L-shape and mounted to the first member 551; a buffer member 555 made of synthetic resin is attached to the entire surface of the contact piece 554 by welding or the like to the contact piece 554 joined to the inclined edge of the attachment piece 553 substantially parallel to the opening surface of the opening 39C.

The bracket 55 is inserted through the opening 39C, and the first member 551 on the base end side is positioned inside the cover 39, in addition to the bolt 55A and the nut 55B. A part of the mounting piece 553 of the second member 552 is positioned inside the hood 39, and the other part is positioned outside the hood 39. The entirety of abutment tab 554 and cushioning member 555 are located outside of cover 39.

Outside the cover 39, the cushion member 555 on the front end side faces the back surface of the seat back 35A of the operator seat 35. When the seat back 35A is tilted rearward at a predetermined angle, the back surface of the seat back 35A abuts against the cushioning member 555, and the reclining amount of the seat back 35A on the rearward side is restricted.

The size of the outer edge of the contact piece 554 and the cushioning member 555 provided on the distal end side of the bracket 55 is larger than the size of the inner edge of the opening 39C. In the case where it is desired to detach the cover 39, it is necessary to detach the second member 552 of the bracket 55 in addition to the bolt 39D for integrally fixing the cover 39, so as to avoid the opening 39C from being caught by the bracket 55.

However, the presence of such a bracket 55 is not only hidden by the seat back 35A and not easily found, but also, in order to detach the bracket 55, it is necessary to detach the first and

second members

551 and 552 by inserting a bolt 55A and a nut 55B inside the cover 39 into the opening 39C, and thus, detachment is not easy.

[ Effect of the embodiment ]

According to the hydraulic excavator 1 of the present embodiment described above, since the bracket 55 facing the seat back 35A is inserted into the opening 39C of the cover 39, the cover 39 can be made difficult to detach, and the effect of suppressing theft of electrical components can be achieved, and the object of the present invention can be achieved.

The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like are included within a range in which the object of the present invention can be achieved.

For example, in the above embodiment, the support frame 51 supporting the electrical components E1 and E2 has the partition plate 54 partitioning the internal space of the cover 39, but the present invention also encompasses a case where such a partition plate 54 is not provided. In this case, the bracket may be configured such that a long member is prepared as the first member and the lower end thereof is directly fixed to the substrate 52 or the like. In order to prevent the entry of dust, rain water, and the like, the entire opening may be closed by a planar seal from the inside of the cover, a linear slit may be provided in such a seal, and the bracket may be inserted through the slit.

In the above embodiment, the bolt 55A and the nut 55B used in the bracket 55 are located inside the cover 39, but these bolts and nuts may be located outside the cover at positions that are not easily found and not easily handled by, for example, the contact piece of the second member.

In the embodiment, the bracket 55 is used as a restricting member that restricts the reclining amount of the seat back 35A, but as the bracket of the present invention, a dedicated member for making the cover difficult to detach may be provided.

The invention is particularly suitable for small top-cover hydraulic excavators.

Description of the reference numerals

1 … hydraulic excavator, 34 … top cover, 35a … seat back, 39 … cover, 39C … opening, 51 … support frame, 54 … divider plate, 55 … bracket, 55a … bolt, 551 … first member, 552 … second member, E1, E2 … electrical components.

Claims

1. A hydraulic excavator which is a hydraulic excavator having a head cover, the hydraulic excavator being characterized in that,

the hydraulic excavator is provided with:

an electrical component arranged behind the seat back;

a cover that covers the electrical component; and

a bracket that is inserted into an opening provided in the cover, has a distal end side that protrudes outward from the opening toward the cover to face a rear surface of the seat back, and has a proximal end side that is attached to a support frame inside the cover,

the back surface of the seat back is abutted against the front end of the bracket,

the support frame is provided with a partition plate for partitioning the space inside the cover,

one of the spaces partitioned by the partition plate communicates with the outside through the opening, and the electrical component is located in the other space.

2. The hydraulic excavator of claim 1 wherein,

the bracket includes a first member on a base end side and a second member on a leading end side engaged with the first member by a bolt,

the head of the bolt is located inside the cover.