JPS6255003A - Apparatus for lifting and falling working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lifting device for a working machine in a riding vehicle such as a tractor.

[Prior art]

In general, in a passenger work vehicle such as a tractor, the raising and lowering of agricultural or construction ground-based work equipment is carried out by hydraulic cylinders mounted on the front and rear of the vehicle body.

By the way, the selection operation of the front and rear hydraulic cylinders for operating the agricultural or construction ground work equipment in such conventional riding work vehicles is selectively performed by operating a switching lever provided on the hydraulic control device. and,
The lifting and lowering operations of both of these hydraulic cylinders, that is, the lifting and lowering operations of various ground-based working machines, have also been performed by a lifting lever that is provided separately from the switching lever.

[Problem that the invention seeks to solve]

In other words, a conventional hydraulic control device for operating a land-based work machine for agriculture or construction in a passenger work vehicle has a switching lever for selecting the front and rear hydraulic cylinders, and a link device for the selected hydraulic cylinder to move up and down. It requires two levers, one for raising and lowering the
The operation for this is complicated, and separate levers must always be provided to select the hydraulic cylinder and operate the linkage, which increases the production cost of the hydraulic control device. However, it was also difficult to manufacture and assemble.

Furthermore, even if hydraulic cylinders are only installed on either the front or the rear, the hydraulic control device is equipped with a switching lever to select between the front and rear hydraulic cylinders, as described above, so it is possible to accidentally There was an inconvenience that it could be manipulated.

[Means and effects for solving the problem] In a vehicle equipped with a lifting device for raising and lowering a designated work implement at the front and rear of a riding work vehicle such as a tractor, the front and rear lifting devices can be selected using one hydraulic control device. In addition, when one lifting device enters the operating state, the other lifting device is inoperative, and a front and lower lifting device is provided between the front and rear lifting device switching levers and the lifting operation lever of the hydraulic control device. By providing a return mechanism that returns the lifting lever to the neutral position when the partial lifting device is selected, the operability of the lifting device switching lever and the lifting operation lever in the hydraulic control device is simplified. In addition, the purpose is to semi-automate the return of the lift lever from the raised set position to the neutral position.

[Example] First, an overview of a riding vehicle (tractor) equipped with a lifting device for a working machine according to the present invention will be explained with reference to FIG.

The drawing is a partially cutaway side view of a riding work vehicle 1, in which an engine is mounted on the front of a body 2 of the riding work vehicle 1, and a Mitsushilan case is mounted on the rear of the body 2. It is located. The crankshaft of the engine and the mission input shaft of the Mitsushiran case are connected substantially linearly via a propulsion shaft. Further, a passenger seat 3 is provided above the rear part of the vehicle body 2, and front axles 4 are provided at the front, rear, left and right sides of the vehicle body 2.
A rear wheel 5 is attached, and the front and rear wheels 4.5 can be steered by operating a handle 6, and four-wheel drive is possible.

In addition, a lift device 7 is pivotally attached to the front and rear of the vehicle body 2 so as to be able to swing up and down, and at the tip of this lift device 7, for example, a working machine for agricultural or construction purposes (not shown in the figure) is mounted. It is ready to be installed. One end of a link arm 9 of a link device 8 is pivotally connected to the lift device 7, and the other link arm 9 of the link device 8 is pivotally connected to a hydraulic cylinder 10. Further, each of the link arms 9 swings up and down due to the movement of a piston within the hydraulic cylinder 10, thereby raising and lowering the working machine.

In addition, an oil tank 11 is installed in front of the rear hydraulic cylinder 1O and below the passenger seat 3. Hydraulic oil is supplied from this oil tank 11 to an oil pump, and the oil discharged from the oil pump is It is selectively supplied to the front and rear hydraulic cylinders 10 and 10 via a hydraulic control device 13.

Hereinafter, the return mechanism, which is a main part of the lifting device for a work machine according to the present invention, will be explained based on FIGS. 2 and 3.

In the figure, IO is the rear hydraulic cylinder 10 mentioned above (the front hydraulic cylinder 10 is omitted), and 13 is a hydraulic control device.

A lifting lever 14 for raising and lowering the hydraulic cylinder 10 is provided on the left side in front of the hydraulic control device 13, and a switching lever 14 for switching between the front and rear hydraulic cylinders 10 and 10 is provided on the right side. It is 15.

By the way, the elevating lever 14 is provided with an interlocking cam 17 that makes the rotating shaft 16 coaxial.
A spring 19 is stretched between the small arm 18 and the small arm 18 provided on the side of the switching lever 15.

Further, a rod insertion portion 2 is provided in the center portion of the switching lever 15.
0, and the tip of a feedback rod 21 whose negative end is locked to the link arm 9 operated by the hydraulic cylinder IO is inserted into the rod insertion portion 20.

Further, the elevating lever 1 of the feedback rod 21
A movable horse mackerel center star 22 is attached near the line 4, and when the switching lever 15 is operated to select the position shown by the solid line in FIG. 2, that is, the rear hydraulic cylinder 10, the feedback rod 21 is It comes into contact with the interlocking cam 17 when moving from the imaginary line position in the figure to the solid line position state.

The operation will be explained below. First, when the switching lever 15 of the front/rear hydraulic cylinder 10 is in the rear position, the hydraulic cylinder 10 is in a raised position by operating the lift lever 14. At this time, when the link arm 9 of the hydraulic cylinder 10 descends, the feedback rod 21, whose one end is locked to the link arm 9, moves to the right in the figure. At this time, the feedback rod 21
The movable adjuster 22 attached to the lift lever 14 comes into contact with the upper end of the interlocking cam 17 that rotates together with the lift lever 14, thereby rotating the lift lever 14 from the raised position to the neutral position.

Therefore, even if the link arm 9 naturally descends, the elevating lever 14 will not remain in the elevating position and will always return to the neutral position.

On the other hand, when the switching lever 15 is in the forward position, the iron insertion portion 2o provided on the switching lever 15 moves upward, so that the feedback rod 21 moves upward as shown by the imaginary line. Therefore, the interlocking cam 17, which rotates together with the elevator lever 14, does not come into contact with the movable horse mackerel center star 22 attached to the feedback rod 21. Therefore, when the switching lever 15 is operated forward, the switching lever Since the spring 19 is activated by the small arm 18 which rotates together with the small arm 15 to attract the interlocking cam 17, the elevating lever 14 is always returned to the neutral position.

〔Effect of the invention〕

The present invention relates to a vehicle equipped with a lifting device for raising and lowering a predetermined working machine at the front and rear of a riding work vehicle such as a tractor.
A single hydraulic control device selectively operates the front and rear lifting devices, and when one lifting device enters the operating state, the other lifting device becomes inoperable, and the front and rear lifting devices of the hydraulic control device When the front elevating device is selected between the elevating device switching lever and the elevating lever, the return mechanism operates in conjunction with this to return the elevating lever to the neutral position. The operation of the elevating device switching lever and the elevating lever can be simplified, and the return of the elevating lever from the raised set position to the neutral position can be semi-automated.

Furthermore, since the configuration for this purpose is simple, the cost is low and assembly is easy.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an outline of a riding work vehicle equipped with a lifting device for a working machine according to the present invention, and FIGS. 2 and 3 are explanatory diagrams showing the main parts of the present invention. 9... Link arm, 10... Hydraulic cylinder,
13...Hydraulic control '72.14...Elevating lever, 15...Switching lever, 17...Interlocking cam,
18...Small cam, 19...Spring, 21...
Feedback rod, 22...Movable horse mackerel star. Patent Applicant: Honda Motor Co., Ltd. Procedural Masaaki Shiho (spontaneous) February 4, 1985 Michibe Uga, Commissioner of the Patent Office1, Indication of Case Patent Application No. 196368, 19852, Invention Name of Work Machine Lifting Device 3, Relationship to the Amendment Case Patent Applicant Address 2-1-1 Minami-Aoyama, Minato-ku, Tokyo Name (532)
Honda Motor Co., Ltd. 4, Agent 101 Address 2-7-4 Kanda Tsukasa-cho, Chiyoda-ku, Tokyo fl + Inventor's address field in the application form (2) Full text correction of the specification Description 1, Title of the invention Lifting device for work equipment 2, Claims (1) In a vehicle equipped with a lifting device for raising and lowering a predetermined work implement at the front and rear of a riding work vehicle such as a tractor, the front and rear lifting devices are controlled by one hydraulic control device. is selectively operated, and when either the front or rear lifting device is selected and moves upward between the front and rear lifting device switching levers of the hydraulic control device and the lifting lever, the lifting lever is interlocked with the lifting lever. A lifting device for a working machine, characterized by a mechanism that avoids movement of an adjuster member of a rod interlocked with a link arm from the interlocking member. (2) In a vehicle equipped with a lifting device for raising and lowering a predetermined work implement at the front and rear of a riding vehicle such as a tractor, a single hydraulic control device selectively operates the front and rear lifting devices, and the hydraulic control device When either the front or rear lifting device is selected between the front and rear lifting device switching lever of the device and the lifting lever,
A lifting/lowering station for a working machine characterized by providing a return mechanism that returns the lifting lever to the neutral position in conjunction with this. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a lifting device for a working machine in a riding vehicle such as a tractor. [Prior Art] In general, in a passenger work vehicle such as a tractor, the lifting and lowering of agricultural or construction ground-based work equipment is carried out by hydraulic cylinders mounted on the front and rear of the vehicle body. By the way, the selection operation of the front and rear hydraulic cylinders for operating the agricultural or construction ground work equipment in such conventional riding work vehicles is selectively performed by turning a switching lever provided on the hydraulic control device. ,and,
The lifting and lowering operations of both of these hydraulic cylinders, that is, the lifting and lowering operations of various ground-based working machines, have also been performed by a lifting lever that is provided separately from the switching lever. [Problems to be Solved by the Invention] In other words, a conventional hydraulic control device for operating a land-based work machine for agriculture or construction in a riding vehicle has a switching lever for selecting the front and rear hydraulic cylinders, and a selection lever for selecting the front and rear hydraulic cylinders. Two levers are required, including a lifting lever to raise and lower the link device of the hydraulic cylinder.
The operations for this are complicated, and the selection of the hydraulic cylinder and the operation of the linkage device are always performed separately, and manufacturing and assembly are also difficult. Furthermore, even if hydraulic cylinders are only installed on either the front or the rear, the hydraulic control device is equipped with a switching lever to select between the front and rear hydraulic cylinders, as described above, so it is possible to accidentally There was an inconvenience that it could be manipulated. [Means and effects for solving the problem] In a vehicle equipped with a lifting device for raising and lowering a designated work implement at the front and rear of a riding work vehicle such as a tractor, the front and rear lifting devices can be selected using one hydraulic control device. and a lifting device switching lever and a lifting operation lever at the front and rear of the hydraulic control device;
By providing a return mechanism that returns the elevator lever to the neutral position when either the front or rear lifting device is selected between the The purpose of the present invention is to simplify the operability of the lift operation lever and to semi-automatize the return of the lift lever from the raised set position to the neutral position. Furthermore, by avoiding engagement between the adjuster member and the interlocking cam, even if one lift arm is raised, the other lift arm can be raised smoothly. [Example] First, an overview of a riding vehicle (tractor) equipped with a lifting device for a working machine according to the present invention will be explained with reference to FIG. The drawing is a partially cutaway side view of a riding work vehicle 1, in which an engine is mounted on the front part of a body 2 of the riding work vehicle 1, and a transmission case is arranged at the rear of the body 2. has been done. The crankshaft of the engine and the Mitsushiran input shaft of the transmission case are connected substantially linearly via a propulsion shaft. Further, a passenger seat 3 is provided above the rear part of the vehicle body 2, and front wheels 4 are provided on the front, rear, left and right sides of the vehicle body 2.
A rear wheel 5 is attached, and the front and rear wheels 4.5 can be steered by operating a handle 6, and four-wheel drive is possible. Further, a lift device 7 is pivotally attached to the front and rear of the vehicle body 2 so as to be able to swing up and down. - At the tip of the device 7, there is a working machine (not shown in the diagram), for example, for agricultural or construction purposes.
can be installed. The lift device 7
There is a link f! ! One end of the link arm 9 of 8 is pivotally connected, and the other link arm 9 of the link device ts is pivotally connected to the hydraulic cylinder IO. Further, each of the link arms 9 swings up and down due to the movement of a piston in the hydraulic cylinder 1O, thereby raising and lowering the working machine. Further, an oil pump 11 is installed in front of the rear hydraulic cylinder 10 and below the passenger seat 3, and hydraulic oil is supplied from the oil pump 11 to an oil pump, and the oil discharged from the oil pump is controlled by hydraulic pressure. The discharged oil is supplied to the device 13, and the discharged oil is selectively supplied to the front and rear hydraulic cylinders 10.10 via a hydraulic switching device. Hereinafter, the return mechanism, which is a main part of the lifting device for a work machine according to the present invention, will be explained based on FIGS. 2 and 3. In the figure, 10 is the aforementioned rear hydraulic cylinder 10 (the front hydraulic cylinder 10 is omitted), and 13 is a hydraulic control device. A lifting lever 14 for raising and lowering the hydraulic cylinder 10 is provided on the left side in front of the hydraulic control device 13, and a switching lever 14 for switching between the front and rear hydraulic cylinders 10 and 10 is provided on the right side. It is 15. By the way, the elevating lever 14 is provided with an interlocking cam 17 that makes the rotating shaft 16 coaxial.
A spring 19 is stretched between the small arm 18 and the small arm 18 provided on the side of the switching lever 15. Further, a rod insertion portion 2 is provided in the center portion of the switching lever 15.
0, and the tip of a feedback loft 21 whose one end is locked to the link arm 9 operated by the hydraulic cylinder 10 is inserted into the rod insertion portion 20. Further, the elevating lever 1 of the feed bank rod 21
4, a movable adjuster gear 22 is attached to the movable adjuster gear 22 of the feedback rod 21 when the switching lever 15 is operated to select the position indicated by the solid line in FIG. 22 comes into contact with the interlocking cam 17 when it moves from the imaginary line position to the solid line position in the figure. The operation will be explained below. First, when the switching lever 15 of the front/rear hydraulic cylinder 10 is in the rear position, the hydraulic cylinder 10 is in a lowered position by operating the lift lever 14. At this time, when the link arm 9 of the hydraulic cylinder 10 rises, the feedback rod 21, which has one end locked to the link arm 9, moves upward and to the right in the figure. At this time, the movable adjuster 22 attached to the feedback rod 21 comes into contact with the upper end of the interlocking cam 17 that rotates together with the lift lever 14, thereby rotating the lift lever 14 from the raised position to the neutral position. You will be forced to do so. Therefore, even if the link arm 9 naturally rises, the elevating lever 14 will not remain in the elevating position and will always return to the neutral position. On the other hand, when the switching lever 15 is in the forward position, the rod insertion portion 20 provided on the switching lever 15 moves upward, so the feedback rod 21 moves upward as shown by the imaginary line. Therefore, even if the link arm 9 rises, the interlocking cam 17, which rotates together with the elevating lever 14, does not come into contact with the movable adjuster scoop 22 to which the feedback rod 21 is attached. Therefore, when the switching lever is tilted forward, the lift lever will not become inoperable even if the rear link arm rises, and when the switching lever 15 is operated forward, the switching lever 15 A spring 19 is activated by the small arm 18 that rotates together to attract the interlocking cam 17, so that the elevating lever 14 is always returned to the neutral position. [Effects of the Invention] The present invention provides a vehicle equipped with a lifting device for raising and lowering a predetermined working machine at the front and rear of a riding vehicle such as a tractor.
A single hydraulic control device selectively operates the front and rear lifting devices, and either the front or rear lifting device is connected between the front and rear lifting device switching lever and the lifting lever of the hydraulic control device. 8! When is selected and moves upward, the movement of the adjuster member of the rod that is interlocked with the link arm is avoided from the interlocking member that is interlocked with the lift lever.8! When it is placed horizontally and either the front or rear lifting device is selected between the front and rear lifting device switching levers of the hydraulic control device and the lifting lever, the lifting lever is moved to the neutral position in conjunction with this. Since the return mechanism works to return the lift lever to the neutral position, it is possible to simplify the operation of the lift switchover lever and the lift lever in the hydraulic control device, and to return the lift lever from the raised center position to the neutral position. The return can be semi-automated. Furthermore, by adopting the link mechanism of the rod, the lift lever will not become inoperable no matter which way the switching lever is switched, and since the configuration for this is simple, the cost is low and assembly is easy. Become. 4. Brief description of the drawings Fig. 1 is an explanatory diagram showing an outline of a riding work vehicle equipped with a lifting device for a working machine according to the present invention, and Figs. 2 and 3 are explanatory diagrams showing the main parts of the present invention. It is a diagram. 9...Link arm, lO...Hydraulic cylinder, 1
3... Hydraulic control device W, 14... Lifting lever, 15... Switching lever, 17... Interlocking cam, 18...
...Small cam, 19...Spring, 21...Feed bank rod, 22...Movable adjuster.

Claims (2)

[Claims] (1) When a riding work vehicle such as a tractor is equipped with a lifting device for raising and lowering a specified work implement at the front and rear, a single hydraulic control device selectively operates the front and rear lifting devices, and one A lifting device for a working machine, characterized in that when the device enters an operating state, the other lifting device becomes inactive. (2) In a vehicle equipped with a lifting device for raising and lowering a predetermined work implement at the front and rear of a riding vehicle such as a tractor, a single hydraulic control device selectively operates the front and rear lifting devices, and the hydraulic control device A work machine characterized in that a return mechanism is provided between the front and rear lifting device switching lever and the lifting lever when the front lifting device is selected and returns the lifting lever to a neutral position in conjunction with this. Lifting device.