JP4243772B2 - Switching valve arrangement structure for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction machine, and in particular, to a switching valve arrangement structure for a construction machine.
[0002]
[Related background]
A construction machine such as a hydraulic excavator is provided with a plurality of hydraulic actuators for operating various operating parts such as a boom and a bucket, and each of the plurality of hydraulic actuators is controlled by a hydraulic control valve.
Specifically, each hydraulic control valve is provided with a pilot port that receives hydraulic pressure as a pilot pressure, and each pilot port is connected to a plurality of pilot valves provided in the driver's seat via oil passages. The plurality of pilot valves are grouped in the same operating unit group and arranged in the front of the driver's seat, and one operation lever is provided for each of the plurality of pilot valves in the same operating unit group. It has been. That is, when the operator moves the operation lever back and forth, right and left, etc., the corresponding pilot valve is actuated to generate a pilot pressure, whereby the corresponding hydraulic control valve is controlled to open and close and the desired hydraulic actuator is Operate.
[0003]
By the way, the same operating part group corresponding to one operation lever and the operation directions such as front, rear, left and right of the operation lever may be set to be easy for the operator to use based on the experience and customs of the operator. In many cases, it may differ depending on the construction machine manufacturer.
However, considering that workers often use construction machines for leasing or rental as in today's situation, the fact that the operating direction of the operation lever, such as front, back, left and right, differs depending on the construction machine manufacturer. This is not preferable because it may cause confusion.
[0004]
Therefore, a switching valve (see Japanese Utility Model Laid-Open No. 5-49858) that can change the connection relationship between the hydraulic control valve and the pilot valve to, for example, a connection relationship with a construction machine other than its own product, is provided between the hydraulic control valve and the pilot valve. It is considered to be provided in between.
[0005]
[Problems to be solved by the invention]
According to the above-mentioned publications and the like, such a switching valve is switched by an operator, and thus is generally disposed at a position close to the driver's seat, that is, in the driver's cabin or the utility room (multipurpose room) behind the driver's cabin. Has been.
However, as construction machines become smaller in size today, the cabs and utility rooms tend to become narrower, and the use of the switching valves in these cabs and utility rooms deteriorates the space usage efficiency. This is not preferable.
[0006]
Further, the switching valve only needs to be switched once before work, that is, it is not frequently operated during driving and does not necessarily have to be near the driver's seat.
The present invention has been made to solve such problems, and an object of the present invention is to optimize a switching valve that changes the connection relationship between a hydraulic control valve and a pilot valve while effectively using space. An object of the present invention is to provide a switching valve arrangement structure for a laid-out construction machine.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a driver's cab is provided in front of the center frame on one side frame of the pair of side frames, and a plurality of pilot valves and operating levers are connected to the operating frame. It is arranged indoors, a plurality of hydraulic control valves are arranged between a pair of frame members of the tail frame, and a connection relationship between each pilot port of the plurality of hydraulic control valves and a plurality of pilot valves operated by an operation lever is established. A switching valve that can be changed into a plurality of combinations is disposed on the upper flange of the frame member on the side close to the cab .
[0008]
Therefore, the switching valve that changes the connection relationship between the pilot ports of the hydraulic control valve and the pilot valve is laid out at an optimal position that does not interfere with the hydraulic control valve and the pilot valve while effectively using space. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Referring to FIG. 1, a hydraulic excavator that is one of construction machines to which a switching valve arrangement structure for a construction machine according to the present invention is applied is schematically shown in a perspective view mainly showing a frame portion.
[0010]
As shown in the figure, the hydraulic excavator is, as is well known, a swiveling body, that is, a counterweight 2, a cabin (operating cab) 3, a bucket arm (working machine) 4, and an engine compartment 5 via a frame 8. The utility room 6 and the like are mounted.
The frame 8 mainly includes a center frame 9 provided with a turning motor 7, a tail frame 10 connected to the center frame 9, and a pair of side frames 20 and 22 extending from the center frame 9 and the tail frame 10 to the left and right. The bucket arm 4 is supported by the center frame 9, the counterweight 2 and the engine room 5 are placed on the tail frame 10, and the cabin 3 and the utility room 6 are placed on the left side frame 20.
[0011]
The tail frame 10 includes a pair of I-shaped frame steel members (frame members) 12 and 16 in which upper flanges 14 and 18 and lower flanges 15 and 19 are vertically joined to upper and lower ends of webs 13 and 17, respectively. It is comprised from the floor steel plate 11 formed by joining webs 13 and 17 mutually.
Then, as shown in the figure, on the floor steel plate 11 between the pair of frame steel materials 12 and 16, various hydraulic actuators provided in the bucket arm 4 and the like are controlled so as to be close to the turning motor 7. A control valve unit 30 having a plurality of hydraulic control valves is disposed via a bracket 32.
[0012]
On the other hand, a plurality of operation levers 36 and 38 operated by an operator are provided in the cabin 3, and a plurality of pilot valves corresponding to these operation levers 36 and 38 are the same as the pilot valve groups 37 and 39. They are arranged for each operation unit group. The pilot valve groups 37 and 39 are respectively connected to the pilot ports of the corresponding hydraulic control valves of the control valve unit 30 through the hydraulic pipe (oil passage) 40, the multi-valve (switching valve) 50, and the hydraulic pipe (oil passage) 42. 33 (see FIG. 2). That is, when the operation levers 36 and 38 are operated, the corresponding pilot valve is activated to generate a pilot pressure, whereby the corresponding hydraulic control valve is controlled to open and close and the desired hydraulic actuator is activated.
[0013]
The multi-valve 50 is a switching device that makes it possible to change the connection relationship between the pilot ports 33 of the plurality of hydraulic control valves and the plurality of pilot valves into a plurality of combinations by operating the lever 52, as described above. It is known by the above publications. Therefore, description of the details of the structure is omitted here.
Here, the multi-valve 50 is disposed on the upper flange 14 of one of the frame steel members 12 of the tail frame 10 so as to be close to the control valve unit 30.
[0014]
Referring to FIG. 2, a cross section along the line AA in FIG. 1 is shown. Specifically, as shown in FIG. 2, a bracket 60 is welded or the like on the upper flange 14 beside the turning motor 7. Furthermore, a bracket 62 having an L-shaped cross section is attached to the bracket 60 with screws (fasteners) 64 and 64 so as to secure a horizontal plane. The multi-valve 50 is attached to the horizontal surface of the bracket 62 by a plurality of screws (fasteners) 66 so that the lever 52 is positioned on the upper side. The lever 52 is preferably positioned on the upper side as shown in the figure, but the multi-valve 50 may be mounted sideways on the horizontal surface of the bracket 62 so that the lever 52 is positioned on the side.
[0015]
By the way, the space on the upper flange 14 beside the turning motor 7 in which the multi-valve 50 is disposed has been a simple space in the past. Therefore, by arranging the multi-valve 50 on the upper flange 14 beside the turning motor 7 in this way, the space utilization efficiency can be increased by effectively utilizing the vacant space.
[0016]
In other words, conventionally, since the multi-valve 50 has been housed in the cabin 3 or the utility chamber 6, the space has not been effectively used as a whole, but the multi-valve 50 is thus placed on the upper flange 14. By disposing, the vacant space can be used effectively and the cabin 3 and the utility room 6 can be used effectively for other purposes.
[0017]
Further, since the space on the upper flange 14 beside the swing motor 7 is not reduced or eliminated as long as the swing motor 7 is required, the size of the excavator can be reduced, and the cabin 3 and the utility chamber 6 can be reduced. Even when is reduced, the space on the upper flange 14 beside the turning motor 7 is always secured as the space for arranging the multi-valve 50. That is, even when the hydraulic excavator is downsized, the multi-valve 50 can be used satisfactorily.
[0018]
Further, the space on the upper flange 14 beside the turning motor 7 is located between the cabin 3 and the control valve unit 30 as shown in FIG. Accordingly, by arranging the multi-valve 50 on the upper flange 14 in this way, the distance between the pilot valve groups 37 and 39 in the cabin 3 and the multi-valve 50 and the distance between the multi-valve 50 and the control valve unit 30 are as follows. In other words, the length of each of the hydraulic pipe 40 and the hydraulic pipe 42 can be shortened as much as possible, whereby the parts can be rationalized.
[0019]
Further, since the space on the upper flange 14 beside the turning motor 7 is relatively close to the cabin 3, the operator operates the multi-valve 50 by opening the rear window of the cabin 3 and reaching out from the driver's seat, for example. Is possible. That is, the lever 52 of the multi-valve 50 can be easily operated from the cabin 3 while the multi-valve 50 is disposed outside the cabin 3 in order to improve the space use efficiency.
[0020]
【The invention's effect】
As described above in detail, according to the switching valve arrangement structure of the construction machine according to claim 1 of the present invention, the driver's cab is provided on the one side frame of the pair of side frames, located in front of the center frame, A plurality of pilot valves and operation levers are arranged in the cab, a plurality of hydraulic control valves are arranged between a pair of frame members of the tail frame, and are operated by pilot ports and operation levers of the plurality of hydraulic control valves. Since the switching valve capable of changing the connection relationship with the plurality of pilot valves to a plurality of combinations is arranged on the upper flange on the side of the frame member close to the cab , the plurality of pilot ports of the hydraulic control valve The above switching valve that changes the connection with the pilot valve is laid out in an optimal position that does not interfere with the hydraulic control valve and the pilot valve while effectively using space. Door can be.
[0021]
This makes it possible to effectively use the cab and utility room where the switching valve has been conventionally used for other purposes, and even if the cab and utility room are reduced due to downsizing, the installation space for the switching valve is always constant. Secured and can continue to be used well.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a switching valve arrangement structure for a construction machine according to the present invention in a perspective view showing a frame portion.
FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and is a view showing details of the switching valve arrangement structure of the construction machine according to the present invention.
[Explanation of symbols]
3 cabin (cab)
4 Bucket arm (work machine)
6 Utility room 7 Rotating motor 8 Frame 9 Center frame 10 Tail frame 12, 16 Frame steel (frame member)
13, 17 Web 14, 18 Upper flange 20, 22 Side frame 30 Control valve unit (hydraulic control valve)
33 Pilot ports 36, 38 Operation levers 37, 39 Pilot valve group 40 Hydraulic pipe (oil passage)
42 Hydraulic pipe (oil passage)
50 Multi-valve (switching valve)
60 Bracket 62 Bracket

Claims (1)

A center frame that supports the work machine, a tail frame that has a pair of frame members including a web and upper and lower flanges and is connected to the rear of the center frame, and a pair of sides that extend laterally from the center frame and the tail frame A plurality of hydraulic control valves for controlling the operation of the plurality of hydraulic actuators, a plurality of pilot valves connected to respective pilot ports of the plurality of hydraulic control valves via oil passages, and the plurality of pilot valves A switching valve arrangement structure for a construction machine, comprising: an operating lever for operating the control valve; and a switching valve that is interposed in the oil passage and is capable of changing a connection relationship between each pilot port and the plurality of pilot valves into a plurality of combinations. Because
A driver's cab is provided on one side frame of the pair of side frames and positioned in front of the center frame,
The plurality of pilot valves and the operation lever are disposed in the cab,
Switching the construction machine, wherein the plurality of hydraulic control valves are disposed between the pair of frame members, and the switching valve is disposed on an upper flange of the frame member on the side close to the operator cab. Valve arrangement structure.

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