JP2002250303A - Hydraulic control device of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that, since the number of hydraulic actuators extractable power for working from a tractor is 3c at most and, a space around a lifting hydraulic control unit is small, it is difficult to install more hydraulic actuators thereon. SOLUTION: A working machine 30 having a plurality of hydraulic actuators is installed on a working vehicle, and the same number of operating means and control means as those of the hydraulic actuators are installed thereon. An optional means set optionally on a frame body of the working vehicle include mechanically operated valves 41, 42, and 43, and an additional control means other than those set optionally includes a solenoid-operated valves 44. Optionally set control valves for working functioning as control means are disposed stackingly, and auxiliary control valves other than those set optionally functioning as additional control means are disposed thereon stackingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for mounting an auxiliary control valve for taking out an external device in a hydraulic control device for a work vehicle such as a tractor when it is desired to further control hydraulic equipment having a set number or more.

[0002]

2. Description of the Related Art Conventionally, in a working vehicle such as a tractor or the like, a working machine is mounted on a rear or a front portion of the body to be operable. Examples of the working machine include a boom sprayer, a loader, and a mower. BACKGROUND ART Hydraulic devices (hydraulic actuators) such as hydraulic cylinders and hydraulic motors are used to raise and lower arms, open and close booms, raise and lower work machines such as buckets, and rotate them. When these hydraulic devices are used, a control valve is connected to an external outlet provided on a transmission case, and an operation tool of the control valve is arranged in an operation unit so that the operation can be performed.

[0003]

Since the number of hydraulic actuators for driving the work machine is one or two, the number of external actuators is usually three or less. That is, as an option setting, a space is secured so that a maximum of three control valves for taking out the outside can be attached.

[0004] However, in the case of a backhoe or a snow blower, four or more hydraulic actuators are required, or when the working equipment is large and a control valve is operated using pilot hydraulic pressure, or when it is desired to finely control the hydraulic actuator. There is. In such a case, the space for mounting four or more control valves, pilot valves, electromagnetic valves, and the like is not reliably secured, and the space for mounting the operation lever is not secured.
Therefore, a very troublesome operation of attaching a hydraulic control box to a fender, a side portion of a dashboard, or the like, and connecting and connecting a hydraulic hose is required, and there is a problem that the piping is exposed and caught.

[0005]

In order to solve the above problems, the present invention solves the problems by the following means. That is, in the present invention, a work machine having a plurality of hydraulic actuators can be mounted on a work vehicle, and the same number of operating means and control means as the hydraulic actuators are attached. The control means was a mechanically operated valve, and the additional control means other than the option setting was an electromagnetically operated valve.

According to a second aspect of the present invention, a work control valve serving as control means for setting the option is laminated, and an auxiliary control valve serving as an additional control means other than the option is laminated thereon.

According to a third aspect of the present invention, a work control valve serving as control means for setting the option and an auxiliary control valve serving as additional control means other than the option setting are arranged near a transmission case, and the operating means is provided in an operation unit. The operating means of the working control valve was provided with additional operating means of the control valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a work vehicle according to the present invention is a tractor and a work machine is a snow blower will be described with reference to the drawings. FIG. 1 is an overall side view of a tractor with a snow blower mounted on the front of the fuselage, FIG. 2 is a side view showing a mounting configuration of a working control valve, an auxiliary control valve, and operating means, FIG. 3 is a plan view of the same, and FIG. It is a hydraulic circuit diagram.

Referring to FIG. 1, an embodiment in which the work vehicle is a tractor will be described from the overall configuration. A front wheel 1 and a rear wheel 2 serving as running wheels are supported before and after the machine, an engine 5 is disposed inside a hood 6 on a front engine frame 13, and a steering handle 10 is provided behind the hood 6. A seat 11 is disposed behind the steering handle 10. A main transmission lever 3, an auxiliary transmission lever 4, a high / low switching lever, a hydraulic operation lever, which will be described later, and the like protrude from the side of the seat 11. A forward switching lever 7 is disposed, and a brake pedal and a main clutch pedal are disposed below the handle column. The steering handle 10, the seat 11, the levers, the brake pedal, and the like are arranged in a driving unit 19 in the cabin 12.

A transmission housing is disposed at the rear of the engine 5, and a transmission case 9 is disposed at the rear of the transmission housing. The driving force can be simultaneously transmitted to the front wheels 1 via a mechanism.

The driving force of the engine 5 is transmitted to a PTO shaft 15 protruding from the rear end of the transmission case 9, and a working machine mounting device 17 is mounted on the rear end of the machine body from the PTO shaft 15 via a universal joint (not shown). It is configured to be able to drive the working machine mounted via the intermediary.

A mounting frame 20 is vertically fixed to the left and right of the front end of the engine frame 13, and an upper link 21 and a lower link 22 are pivotally supported by the mounting frame 20 in parallel. An elevating hydraulic cylinder 23 is arranged between the upper and lower mounting frames 20. A mounting hitch 24 is pivotally connected to the front ends of the upper link 21 and the lower link 22. The front work machine mounting device 25 is configured in this manner.

An output shaft protrudes forward from the engine 5, and the output shaft is input to a gear case 26 fixed to the engine frame 13. A front PTO shaft protrudes forward from a front portion of the gear case 26, and a universal Power can be transmitted to the front working machine via a joint or the like.

In this embodiment, a snow removal machine 30 is mounted on the front work machine mounting device 25 as a front work machine.
The snow blower 30 is mounted on the mounting hitch 24 so that the rear part of the blower case 31 can be tilted left and right.
The snow removal machine 30 can be tilted by the operation of a tilt cylinder 32 interposed between the snowplow and the mounting hitch 24. A blower 33 is housed in the blower case 31 and the blower case 3
An auger case 34 is arranged at the front of the unit 1, and a scraping auger 35 is arranged inside the auger case 34. The scraping auger 35 and the blower 33 are driven by the front PTO shaft through a universal joint or the like, and the rotation of the scraping auger 35 crushes the snow, scrapes the snow into the auger case 34, and rotates the blower 33. It bounces the crushed snow upwards.

A shooter 36 is mounted on the upper part of the blower case 31 so as to be rotatable left and right, a hydraulic rotary motor 37 is mounted on the blower case 31, and a gear is fixedly mounted on an output shaft of the rotary motor 37. And shooter 3
A ring gear is formed around the lower part of the gear 6 and meshes with the gear, and the shooter 36 can be rotated by driving a rotation motor 37 so that the snow throwing direction can be changed.

A shoot cap 38 is provided at the upper end of the shooter 36. The shoot cap 38 has one lower end pivotally supported on the upper portion of the shooter 36.
An angle adjusting cylinder 39 is disposed between the shoot cap 38 and the shoot cap 38. By rotating the angle adjust cylinder 39, the angle of the shoot cap 38 is adjusted so that the snow throw distance can be adjusted.

The lifting hydraulic cylinder 23, the tilt cylinder 32,
As shown in FIGS. 2, 3, and 4, the rotation motor 37 and the angle adjusting cylinder 39 are connected to work control valves 41, 42, and 43 and an auxiliary control valve 44, respectively. The working control valve 4 is fixedly mounted on the lifting hydraulic control unit 45 fixedly mounted on the transmission case 9.
The work control valves 42 and 43 and the auxiliary control valve 44 are mounted on the top 1 in order. However, in the present embodiment, four control valves are arranged so that four hydraulic devices can be operated. However, as many control valves as the number of hydraulic devices to be mounted are mounted as needed. Therefore, when the hydraulic working machine is not mounted, the control valve is unnecessary.

The working control valve 4
Reference numerals 1, 42 and 43 are constituted by mechanically operated switching valves, and spools of the working control valves 41, 42 and 43 are operated by operating levers 54, 55 and 56 through wires 51, 52 and 53. And remote operation is possible. In other words, the snow remover 30 can be moved up and down by operating the operation lever 54, and the snow remover 30 can be moved by operating the operation lever 55.
Can be tilted left and right, and the shooter 36 can be rotated by operating the operation lever 56.

The working control valves 41 and 42
The 43 and the operation levers 54, 55, 56 are configured to be mountable as an option at the time of shipment or as a retrofit. That is, a working machine having a plurality of hydraulic actuators can be attached to the tractor, and the rotary tilling device is usually mounted, and the other working machine is shipped without being mounted, but other working machines can also be used. As described above, a space and parts for the work control valve and the operation lever are provided as an option so that a desired number of work control valves and operation levers can be attached. The number of options set for this hydraulic actuator is usually three or less, so that it can be used for most work machines. Although the operation levers 54, 55, 56 are arranged on the fender 57 in this embodiment, the mounting positions of the operation levers 54, 55, 56 are not limited as long as they are in the vicinity of the driving unit. Also, a link or the like can be used instead of the wire.

The auxiliary control valve 44 is fixed on the uppermost working control valve 43. The auxiliary control valve 44 is a control valve that is not set as an option. It is not possible to mount the mechanically operated control valve in place of the auxiliary control valve 44 because it may interfere with other members. That is, it is not usually designed to further stack the work control valves. The operation lever 54
The 55 and 56 lever guides 50 are pre-configured from the manufacturing stage, but the space for disposing the operation means for the auxiliary control valve 44 is not formed in the lever guide 50.

Therefore, in the present invention, the auxiliary control valve 44 is constituted by an electromagnetically operated valve (electromagnetic valve). That is, since the electromagnetic valve type auxiliary control valve is configured to be more compact than the work control valve which is the manual (mechanical) operation type switching valve, it can be attached even in a conventional narrow space. . However, the capacity of the electromagnetic valve type auxiliary control valve is smaller than that of the manually operated switching valve. Therefore, it is desirable to use it for a pilot valve or the like. In the case of a working machine equipped with five or more hydraulic actuators, an auxiliary control valve of an electromagnetic valve type is additionally provided on the auxiliary control valve 44.

The solenoid 44a of the auxiliary control valve 44 is connected to an operation switch 5 via a wiring and a drive circuit.
9 is connected. The operation switch 59 is mounted on the operation lever 54 in this embodiment.
5 or 56. With this configuration, it is possible to operate the operation switch 59 while holding the operation lever 54, and two operations can be performed with one hand, thereby improving workability. When mounting more hydraulic actuators than the number of option settings, it is possible to mount and operate more hydraulic actuators only by changing the operation lever. The operation switch 59 can be mounted on the fender 57, and the operation switch 59 is not limited as long as it is within a reach of an operator near the driving unit 19.

Next, the hydraulic circuit will be described with reference to FIG. The hydraulic pump 61 is driven by the power of the engine 5, and the pressure oil discharged from the hydraulic pump 61 is connected to the pump port of the working control valve 41 via the external extraction switching valve 62. Work control valve 41.4
2, 43 and the auxiliary control valve 44 are connected in tandem, the hydraulic cylinder 23 for elevating and lowering is connected to the secondary side of the working control valve 41, and the tilting cylinder 32 is connected to the secondary side of the working control valve 42. The rotating motor 37 is provided on the secondary side of the working control valve 4.
Is connected, and the angle adjustment cylinder 39 is connected to the secondary side of the auxiliary control valve 44.

The main oil passage 63 is connected to a horizontal hydraulic control unit 46 and a vertical hydraulic control unit 45 via the working control valves 41, 42, 43 and the auxiliary control valve 44, and the horizontal hydraulic control unit 46 A tilt cylinder 65 is provided on the secondary side of the switching valve 64.
The switching valve 64 is formed of an electromagnetic valve, and connects the solenoid to the controller. on the other hand,
The inclination of the work machine is detected by a sensor and input to the controller, and the switching valve 64 is switched so as to have an angle set by an inclination setting device provided in the operation unit to drive the inclination cylinder 65, The working machine can be maintained at a desired angle.

The switching valve 66 or 67 of the lifting hydraulic control unit 45 is switched by operating a lifting lever or a lifting switch provided in the operation unit or by inputting a tillage depth sensor.
The lifting cylinder 69 connected to 67 is configured to operate so that the work implement mounting device 17 can be rotated up and down.

In the above-described configuration, the work control valves 41, 42 and 43, which can be conventionally mounted as an option, are arranged in a stack, and the auxiliary control valve 44 is further stacked and mounted thereon.
Centralized arrangement using control valves of the same or the same specification allows easy installation and easy maintenance, as well as reduced piping from the hydraulic pump and combined piping to the drive system Piping, and cost reduction can be achieved. Each control valve can be arranged by effectively utilizing the limited space on the transmission case 9.

Also, the operating means are arranged collectively, and the connecting structure with the operating means can pass through the same path, so that the linking mechanism can be simplified. When an additional hydraulic actuator is mounted in addition to the optional set number of hydraulic actuators, the auxiliary control valve 44 formed of an electromagnetic valve is additionally mounted so as to be stacked, and the hydraulic equipment is controlled. It can be installed in a small space above the working control valve, which is an optional valve.
Can be connected with the operating means by wiring, levers and links are not required for easy connection, the operating means can be a switch or a volume, and can be easily mounted in a small space . In the present embodiment, the snow removing machine has been described as a working machine having four or more hydraulic actuators. However, the working machine is not limited as long as it has four or more hydraulic actuators. Although the work machine is mounted on the section, the work machine may be mounted on the rear.

[0028]

As described above, the present invention has the following advantages. First, as described in claim 1, a work machine having a plurality of hydraulic actuators can be mounted on a work vehicle, and the same number of operating means and control means as the hydraulic actuators are attached to the work vehicle. The control means set as an option is a mechanically operated valve, and the additional control means other than the option setting is an electromagnetically operated valve, so that the operation means and the control means set as an option have sufficient space and parts for mounting in advance. Therefore, by using a relatively large-capacity mechanically operated valve so that it can be used for all types of hydraulic equipment, most of the working machines can be installed and can respond to the demands of users, and the demand can be further reduced. When installing a work machine with many hydraulic actuators,
Since an electromagnetic valve is added, the mounting space is small, and the operating means can be a switch or volume, so the mounting space is small, the mounting position is hardly restricted, and there is no need for levers or links. Can be expanded. In addition, since the control means and the operation means can be connected by wiring, the wiring has a high degree of freedom, can be easily attached, can be easily wired in a hidden position from the outside, and does not impair the appearance.

According to a second aspect of the present invention, the work control valve serving as the control means with the option set is stacked and arranged thereon, and the auxiliary control valve as the additional control means other than the option setting is stacked thereon. As a result, the hydraulic pressure can be easily taken out from the machine without requiring piping or the like, the control means can be centrally arranged, the assembly can be performed easily, and the maintenance can be performed easily.

According to a third aspect of the present invention, a work control valve serving as control means for setting the option and an auxiliary control valve serving as additional control means other than the option setting are arranged near the transmission case, and the operation means is operated. The work control valve and the auxiliary control valve can be attached together with the hydraulic control unit for elevating and lowering the tractor.
The control device can be centrally arranged, so that assembly, adjustment, maintenance, etc. can be easily performed.In addition, the operating means can be centrally arranged in the operation unit, so that maintenance, etc. can be easily performed. became. In addition, since an additional control valve operating means is added to the operation control valve operating means, there is no need to provide an extra installation space, and two operations can be performed with one hand, and operability can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view in which a snowplow is mounted on a front part of a body of a tractor.

FIG. 2 is a side view showing a mounting configuration of a working control valve, an auxiliary control valve, and operating means.

FIG. 3 is a plan view of the same.

FIG. 4 is a hydraulic circuit diagram.

[Explanation of symbols]

 9 Transmission case 19 Operating part 23 Hydraulic cylinder for lifting / lowering 30 Snow blower (work equipment) 41, 42, 43 Work control valve 44 Auxiliary control valve 54, 55, 56 Operation lever 59 Operation switch

Claims (3)

[Claims] A work machine having a plurality of hydraulic actuators can be mounted on a work vehicle, and the same number of operation means and control means as the number of hydraulic actuators are attached to the work vehicle. A hydraulic control device for a work vehicle, wherein a hydraulically operated valve is a mechanically operated valve and an additional control means other than the option setting is an electromagnetically operated valve. 2. The control valve according to claim 1, wherein said control valve is a stack of a work control valve serving as control means for setting the option, and an auxiliary control valve serving as an additional control means other than the option setting is stacked on the work control valve. 2. The hydraulic control device for a work vehicle according to claim 1. 3. An operation control valve serving as control means for setting the option and an auxiliary control valve serving as an additional control means other than the option setting are arranged in the vicinity of a transmission case, and the operation means is arranged in an operation section. 2. The hydraulic control device for a work vehicle according to claim 1, wherein an additional control valve operating means is added to the operating control valve operating means.