JP4229224B2 - Hydraulic excavator work machine operating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a working machine operating device for a hydraulic excavator, and in particular, a small turning type hydraulic excavator.
[0002]
[Prior art]
In general, an operating device having an operating lever is provided on each side of a driver's seat of a small swing type hydraulic excavator. The lever box with the work equipment operating device installed on the side of the operator's boarding / exiting side tilts in front of the driver's seat so that the operating lever can be placed in a position with good operability during work. It is designed to tilt backwards as it gets in the way.
[0003]
A first example of a conventional work machine operating device will be described below. FIG. 8 is a side view of a conventional small turning hydraulic excavator 1a, and FIG. 9 is a plan view. 8 and 9, an upper revolving unit 3a is rotatably mounted on a crawler belt type lower traveling unit 2a. The work implement 4 is attached to the front part of the upper swing body 3a, the driver's seat 5 is provided in the substantially central part, and the engine room 50 for storing the engine (not shown) is provided in the rear part. Lever boxes 51 and 52 having an operation device are disposed on the left and right sides of the driver's seat 5. Operation levers 23 and 23 protrude from the lever boxes 51 and 52, respectively, and the operator tilts the left and right operation levers 23 and 23 to operate the work implement. A tank cover 53 is disposed on the right side of the driver's seat 5, and the operator gets on and off from the left side of the driver's seat. Therefore, the right lever box 51 is fixed, but the left lever box 52 is tilted back and forth to facilitate getting on and off.
[0004]
FIG. 10 is a side view of the left lever box 52. A rear end portion of the lever box 52 is rotatably attached to a bearing member 61 attached to the vicinity of the rear portion of the driver's seat 5 of a bracket 60 fixed to the upper swing body 3a by a rotary shaft 62. Yes. A pilot hydraulic control valve for controlling a hydraulic device for operating the work machine (not shown) is provided in front of the lever box 52, and an operation lever 23 projects from the upper part. A rotating lever 40a is attached to the front and lower portions of the lever box 52. The solid line indicates the forward leaning posture in the working state, and the operation lever 23 is in an optimal position for operation with respect to the driver seat 5. When the operator gets on and off the vehicle, if the turning lever 40a is turned in the direction of the arrow to the position indicated by the thin two-dot chain line in the figure, the lever box 51 is turned in the direction of the arrow about the turning shaft 62. Move to the position indicated by the thin two-dot chain line. As a result, a space is secured in front of and on the left side of the driver's seat 5, and the operator can easily get on and off. Reference numeral 63 denotes a pipe for a pilot hydraulic control valve provided in the lever box 52.
[0005]
As a second example of a conventional work machine operating device, there is one disclosed in JP-A-5-311700.
[0006]
[Problems to be solved by the invention]
In recent years, in order to work in a confined place, further miniaturization of a small swing hydraulic excavator has been desired. However, in the configuration described in the first example, the lever box 52 is large as shown in FIG. 10, and the rear end portion thereof is attached to the vicinity of the rear portion of the driver's seat 5 so as to be tiltable by the rotation shaft 62. Therefore, when the lever box 52 is tilted forward at the time of operation, it occupies a position below the driver's seat 5, and an engine (not shown) has to be disposed at the rear of the driver's seat 5. Therefore, the distance C from the turning center YY of the upper swing body 3a shown in FIG. 8 to the rear end portion of the upper swing body 3a increases, and as shown in FIG. 9, the minimum turning radius C of the upper swing body 3a is reduced. There is a problem that the locus becomes larger than the outer width D of the lower traveling body 2a and hinders downsizing of the vehicle. In addition, the pilot hydraulic control valve pipe 63 provided in the lever box 52 is exposed, and there is a problem that the appearance when the lever box 52 is rotated upward is impaired.
[0007]
In the second example disclosed in Japanese Patent Laid-Open No. 5-311700, when the operator gets off the vehicle, it is necessary to operate both the lock lever and the safety lever, which is troublesome. Further, when the operation lever is tilted backward, an opening is formed between the left control box and the lever base, which may cause foreign matter to enter and is unfavorable in appearance.
[0008]
An object of the present invention is to provide a working machine operating device for a hydraulic excavator that can reduce the size of a vehicle, can easily tilt a lever box, and has a good appearance.
[0009]
In order to achieve the above object, a first aspect of the working machine device for a hydraulic excavator according to the present invention is a driver's seat provided in an upper swing body (3) that is rotatably mounted on a lower traveling body (2). In the working machine operating device of the hydraulic excavator in which the lever box (20) is disposed on the side of (5), the lever box (20) is operated by the frame (7) attached to the upper swing body (3). A lower bracket (31) fixed in a manner to secure a space below the driver's seat (5) in the vicinity of the front portion of the seat (5), and a lower cover attached to cover the lower bracket (31) (21), an upper bracket (33) attached to the lower bracket (31) so as to be tiltable in the front-rear direction by a rotating shaft (32), and an upper cover attached to cover the upper bracket (33) (22); and a top cover ( 2) is characterized by covering the opening of the lower cover (21) from the outside.
[0010]
According to the above configuration, the lower bracket located in the vicinity of the front part of the driver's seat has the upper bracket attached so as to be tiltable in the front-rear direction by the rotation shaft, so that a space is secured below the driver's seat. . Therefore, the engine can be stored under the driver's seat, the rear turning radius of the upper turning body can be reduced, and the vehicle can be reduced in size. In addition, when the upper cover is tilted back and forth, the opening of the lower cover is covered from the outside by the upper cover, so there is no possibility of foreign matter entering from the opening of the lower cover and the internal member is exposed. There is nothing, and the appearance can be improved.
[0012]
The second invention is based on the configuration of the first invention , wherein the upper bracket is attached with a pilot hydraulic control valve having an operation lever protruding from the upper cover.
According to the above configuration, since the pilot hydraulic control valve having the operation lever is attached to the upper bracket, the operation lever is moved to the optimal operability position by tilting the upper bracket, or moved to a position that does not interfere with getting on and off. It is possible to improve operability and facilitate getting on and off of the operator.
[0013]
A third invention is based on the configuration of the first invention , wherein the lower cover is integrated with an exterior device provided on the upper swing body.
[0014]
According to the said structure, an upper cover will coat | cover the lower cover of a structure integrated with an exterior apparatus over the whole tilting range. Therefore, the appearance is good, the number of parts is small, and the cost can be reduced.
[0015]
According to a fourth aspect of the present invention , based on the configuration of the first aspect of the present invention , the upper bracket and the upper cover are rotated integrally with the upper bracket. When the upper bracket is tilted forward, the upper bracket protrudes forward of the upper cover and the upper bracket is lowered. When the upper bracket is tilted backward, it is tilted backward along the operation lever, and a pivot lever for latching the upper bracket to the lower bracket is pivotally attached.
[0016]
According to the above configuration, the pivot lever protrudes forward of the upper cover when the upper bracket is tilted in the working state, so that the operator is prevented from getting off the vehicle during the work. Further, when the upper bracket is tilted backward at the end of the work, the rotation lever tilts backward along the operation lever, so that a space is secured in front of the driver's seat and the operator can easily get on and off. At this time, if an interlock device that interlocks with the rotating lever and stops the operation of the work implement is provided, further safety can be ensured.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a working machine operating device for a hydraulic excavator according to the present invention will be described below in detail with reference to the drawings.
[0018]
FIG. 1 is a side view of a small turning hydraulic excavator 1 having a work machine operating device of the present invention, and FIG. 2 is a plan view. In FIG. 1 and FIG. 2, an upper swing body 3 is rotatably mounted on the lower traveling body 2. A work machine 4 is attached to the front part of the upper swing body 3, and an exterior device 10 that houses an engine, tanks, hydraulic equipment, and the like is provided from the center part to the rear part. A driver's seat 5 is provided at a substantially central portion of the exterior device 10, and a right lever box 7 having left and right lever boxes 20 having operation levers 23, 23 of an operation device for operating a work machine are arranged on both left and right sides thereof. It is installed. The right lever box 7 is fixed to the exterior device 10.
[0019]
3 is a side view of the exterior device 10, and FIG. 4 is a plan view. As shown in FIGS. 3 and 4, the exterior device 10 includes a central cover 11, a left cover 12, a right cover 13, and a rear hood 14, and is mounted on the upper swing body 3. A lower cover 21 having an opening 21a in the upper part is integrally formed on the left and front of the cover 11.
[0020]
FIG. 5 is an external side view of the left working machine operating device. The left lever box 20 includes a lower cover 21 having an opening 21 a in the upper portion and an upper cover 22 having an opening 22 a in the lower portion and provided so as to cover the lower cover 21. The lower cover 11 and the upper cover 22 are provided with a tilting device 30, and the upper cover 22 can tilt with respect to the lower cover 11. An operation lever 23 of a pilot hydraulic control valve 24 that controls the working machine hydraulic device attached to the tilting device 30 protrudes from an upper portion of the upper cover 22, and a rotation lever 40 protrudes forward. When the upper cover 22 is tilted back and forth, the lower cover 21 is formed in a shape such that the upper cover 22 covers the lower cover 21 over the entire tilting range. A pipe 25 connected to the pilot hydraulic control valve 24 is accommodated in the cover 11.
[0021]
FIG. 6 is a side view showing the forward tilting posture of the tilting device 30. An upper bracket 33 is rotatably attached to the lower bracket 31 attached to the vicinity of the front end 5a of the driver's seat 5 of the frame 7 attached to the upper swing body 3 (not shown). ing. A pivot lever 40 is pivotally attached to the upper bracket 33 by a pin 34. A grip 41 is attached to one end of the rotating lever 40, and a locking lever 42 is provided to the other end. A roller 43 is provided at the tip of the locking lever 42. A guide plate 44 having an S-shaped groove 45 is fixed to the lower bracket 31, the roller 43 is engaged with the lower end portion 45 a of the S-shaped groove 45, and the upper bracket 33 is engaged in a forward leaning posture. It has been stopped. The lower bracket 31 and the substantially central portion of the locking lever 42 of the rotating lever 40 are connected by a torsion spring 46. In this state, the torsion spring 46 is attached in a direction to bring the locking lever 42 closer to the lower bracket 31 side. It is fast. Therefore, the roller 43 is pressed against the lower end 45 a of the S-shaped groove 45. The upper bracket 33 and the frame 7 are connected to each other by a tension spring 47 and bias the upper bracket 33 in a direction in which the upper bracket 33 is tilted backward about the rotation shaft 32. A pilot hydraulic control valve 24 having an operation lever 23 is attached to a plurality of bosses 35, 35? Fixed to the upper bracket 33. The upper cover 22 is attached to the mounting plates 36a and 36b provided on the upper bracket 33.
[0022]
The operation of the tilting device 30 will be described below. In the case of tilting the upper bracket 33 in the forward tilt posture backward, in FIG. 6, the operator holds the grip 41 of the rotation lever 40 and rotates it upward (in the direction of the arrow). The rotation lever 40 rotates about the pin 34, and the roller 43 moves away from the lower end 45 a of the S-shaped groove 45. When the rotation lever 40 is further rotated in the direction of the arrow, the roller 43 moves upward along the longitudinal groove of the S-shaped groove 45, and the upper bracket 33 rotates upward about the rotation shaft 32. At this time, the upper bracket 33 can be rotated with a smaller force than the tension of the tension spring 47. Then, as shown in FIG. 7, the roller 43 of the rotation lever 40 comes into contact with the upper end 45 b of the S-shaped groove 45 and stops. At this time, the torsion spring 46 urges the locking lever 42 in a direction away from the lower bracket 31, the roller 43 is pressed against the end 45 b of the S-shaped groove 45, and the upper bracket 33 is locked in a backward inclined posture. .
[0023]
As described above, as shown in the external view of the work machine operating device in FIG. 5, the upper bracket 33 is in a forward tilt position indicated by a solid line during operation, and the operation lever 23 is in an optimal operability position with respect to the driver seat 5. is there. At this time, the turning lever 40 protrudes forward to prevent the operator from getting off. When the work is stopped, as shown by a thin two-dot chain line, the operation lever 23 and the rotation lever 40 are tilted backward. In this state, a space is secured in front of and on the left side of the driver's seat 5, and the operator can easily get out of the vehicle. During this time, the upper cover 22 always covers the lower cover 21 to protect the inside and improve the appearance. If an interlock device that closes the work implement hydraulic circuit when the turn lever 40 is turned upward is provided, the operator will always close the work implement hydraulic circuit when getting off the vehicle, thereby ensuring safety. Is possible.
[0024]
Since the working machine operating device for a hydraulic excavator according to the present invention is configured as described above, the engine 8 can be disposed below the driver's seat 5 as shown in FIG. Therefore, as shown in FIG. 1, the distance A from the turning center line YY of the upper turning body 3 to the rear end portion can be reduced. As a result, as shown in FIG. 2, the minimum turning radius A can be equal to or smaller than the vehicle width B, the entire vehicle can be downsized, the tilting operation in the front-rear direction is easy, and the appearance is good. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view of a small turning hydraulic excavator having a work machine operating device according to the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a side view of the exterior device.
FIG. 4 is a plan view of the exterior device.
FIG. 5 is a side view of the left working machine operating device.
FIG. 6 is a side view showing a forward tilting posture of the tilting device.
FIG. 7 is a side view showing a backward tilting posture of the tilting device.
FIG. 8 is a side view of a small swing hydraulic excavator having a conventional work machine operation device.
FIG. 9 is a plan view of the same.
FIG. 10 is a side view of a conventional left working machine operating device.
[Explanation of symbols]
2: Lower traveling body, 3: Upper turning body, 5: Driver's seat, 5a: Front end, 7: Frame, 8: Engine, 10: Exterior device, 11: Cover, 20: Lever box, 21: Lower cover, 21a 22a: opening, 22: upper cover, 23: operation lever, 24: pilot hydraulic control valve, 25: piping, 30: tilting device, 31: lower bracket, 32: rotating shaft, 33: upper bracket, 34: Pin: 40: rotating lever, 42: locking lever, 43: roller, 44: guide plate, 45: S-shaped groove, 46: torsion spring, 47: tension spring.

Claims (4)

In a working machine operating device for a hydraulic excavator in which a lever box (20) is disposed on the side of a driver's seat (5) provided in an upper swing body (3) rotatably mounted on a lower traveling body (2),
The lever box (20)
A lower bracket (31) fixed in a manner to secure a space below the driver seat (5) in the vicinity of the front portion of the driver seat (5) of the frame (7) attached to the upper swing body (3). )When,
A lower cover (21) attached to cover the lower bracket (31);
An upper bracket (33) attached to the lower bracket (31) so as to be tiltable in the front-rear direction by a rotation shaft (32);
An upper cover (22) attached to cover the upper bracket (33) ;
Upper cover (22), a hydraulic excavator of the working machine and wherein the covering the opening of the lower cover (21) from the outside. The operation of the hydraulic excavator according to claim 1 , wherein a pilot hydraulic control valve (24) having an operation lever (23) protruding from the upper cover (22) is attached to the upper bracket (33). Machine operation device. The working device operating device for a hydraulic excavator according to claim 1, wherein the lower cover (21) is integrally formed with an exterior device (10) provided on the upper swing body (3). The upper bracket (33) is rotated integrally with the upper bracket (33) and the upper cover (22). When the upper bracket (33) is tilted forward, the upper bracket (33) protrudes forward of the upper cover (22), and the upper bracket (33) 33) is locked to the lower bracket (31). When the upper bracket (33) is tilted backward, it is tilted backward along the operation lever (23) and the upper bracket (33) is locked to the lower bracket (31). 2. The working machine operating device for a hydraulic excavator according to claim 1, wherein the moving lever (40) is rotatably attached.

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