JP2003328382A - Front loader mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a front loader for improving the rigidity of a tractor body and to prevent the looseness and opening of a connection portion between an engine body and a clutch housing. <P>SOLUTION: The front loader mounting device comprises a loader supporting bracket 2 for mounting and supporting the front loader 1 at its upper part. The loader supporting bracket 2 is mounted between a front axle bracket 4 located on the side of the engine body 3 and the side of a rear clutch housing 5 and is connected to the upper part of a rear plate 6 laid between the engine body 3 and the clutch housing 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front loader mounting device for mounting a front loader on a vehicle body of a riding tractor.

[0002]

2. Description of the Related Art A front axle bracket or an engine support frame is provided on the side of an engine body, and a loader attachment bracket for attaching and supporting a front loader is attached to these front axle housing and engine support frame.

[0003]

In a riding-type tractor, a clutch housing, a transmission case, and the like are connected to the rear end of the front engine body to form the main body of the vehicle body.
For this reason, when a working machine such as a front loader is directly or indirectly attached to and supported by the front engine body side, a large external force acts on the connecting portion between the engine body and the clutch housing to cause rattling or the connecting portion. May be damaged.

[0004]

According to a first aspect of the present invention, there is provided a loader support bracket 2 for mounting and supporting a front loader 1 on an upper portion thereof, a front axle bracket 4 on a side portion of an engine body 3, and a rear clutch housing. The front loader mounting device is characterized in that the front loader mounting device is mounted between the engine body 3 and the clutch housing 5 and is connected to the upper portion of the rear plate 6 interposed between the engine body 3 and the clutch housing 5.

By mounting and supporting the front loader 1 via the loader support bracket 2, the loader work can be performed. The front loader 1 is acted on in the vertical and front-rear directions. At this time, the actuating force acting on the loader support bracket 2 and the engine body 3 is the clutch housing 5 connected to the rear side of the engine body 3 and the rear. These are received by the upper part of the plate 6 and these engine bodies 3
The stress at the connecting portion between the clutch housing 5 and the clutch housing 5 is dispersed.

According to a second aspect of the present invention, a loader support bracket 2 for mounting and supporting the front loader 1 on the upper portion is provided.
Front axle bracket 4 on the side of engine body 3
And a side portion of the clutch housing 5 on the rear side, and the rear end surface of the engine body 3 and an upper portion of the clutch housing 5 are connected by a connecting bracket 7. .

The acting force of the front loader 1 mounted via the loader support bracket 2 is supported by the loader support bracket 2 on the rear portion of the engine body 3 and the front portion of the clutch housing 5. Moreover, since the upper part of the connecting portion between them is connected by the connecting bracket 7, it cannot be opened back and forth.

[0008]

According to the first aspect of the present invention, the acting force exerted during the operation of the front loader 1 is the loader support bracket 2
Since the rear portion of the engine body 3 and the front portion of the clutch housing 5 are dispersedly supported through the upper and lower portions of the engine body 3, local stress concentration at the connecting portion can be eliminated, and the connecting rigidity can be maintained. It is possible to perform stable loader work with a simple configuration without increasing the weight strength of the clutch 3, the clutch housing 5, and the like.

According to the second aspect of the present invention, the connecting portion between the rear portion of the engine body 3 and the front portion of the clutch housing 5 is connected by the loader support bracket 2, and the upper portion of this connecting portion is the connecting bracket 7. Since the upper portion of the connecting portion is not loosened or opened back and forth, the rigidity of the connecting portion can be increased with a simple configuration, and stable loader work can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The tractor vehicle body is formed by integrally connecting a clutch housing 5, a front mission case 8, a rear mission case 9 and the like from an engine body 3 at a front end portion. Front and rear front axles are provided on both left and right sides of the engine body 3 along the longitudinal direction. The bracket 4 is attached, the lower side is supported by the front axle housing 10, and steerable front wheels 11 are axially mounted on both left and right ends. A radiator 13, a radiator fan 14 and the like are arranged in a front portion of an engine room formed below a hood 12 that covers the engine body 3. A dashboard 15 is provided on the rear side of the bonnet 12, and a steering post 17 of a steering handle 16 is provided.

A rear mission case 9 is provided at the rear of the vehicle body.
Rear wheels 19 are axially mounted on both left and right sides of the vehicle through a rear axle housing 18, and a driver seat 20 is mounted on the upper side.
A fender 21 that covers the rear wheels 19 is arranged. 22
Is a safety frame, 23 is a lift arm, and 24 is a lower link for connecting work machines.

A rear plate 6 is interposed between the rear end surface of the engine body 3 and the front end surface of the clutch housing 5, and these are integrally formed by bolting. Reference numeral 25 is an oil pan at the bottom of the engine body 3, and 26 is a front wheel interlocking shaft that is interlocked from the front transmission case 8 to the front axle housing 10 and is arranged below the clutch housing 5 and the oil pan 25.

The front loader 1 has a loader arm 28 supported by a loader frame 27 attached to the loader support brackets 2 and the like on both left and right sides of the engine body 3 so that the loader arm 28 can move up and down around a lift shaft 29. The loader frame 27 surrounds the left and right sides of the bonnet 12,
The lower rear end is attached to and supported by the loader support bracket 2, and the lower front end is connected to the front end of the front axle bracket 4. Of these, the left and right loader support brackets 2 are formed of angle members, and have a support piece 32 on the upper surface to which the set pin 30 can be inserted and removed to attach and detach the attachment piece 31 of the loader frame 27. 4 has a mounting piece 33 that can be mounted by bolting at the rear end, and the clutch housing 5 at the outer rear part.
Has an attachment piece 34 to be attached to the outer side surface thereof by bolting.
The left and right loader support brackets 2 connect the mounting pieces 34 at the lower end portions with a connecting rod 35 that passes under the front wheel interlocking shaft 26.

The mounting position of the mounting pieces 33 and 34 to the front axle bracket 4 and the clutch housing 5 at the lower portion of the loader support bracket 2 is more than the crankshaft position A provided along the front-rear direction in the engine body 3. Set on the lower side. The upper end of the loader support bracket 2 and the upper end of the rear plate 6 are connected by a connecting plate 36 by bolting or the like. The connection position of the connection plate 36 is set to be higher than the crankshaft position A. A lift cylinder 37 is connected between the loader frame 27 and the loader arm 28. 38
Is a dump cylinder, which is connected between the loader arm 28 and the shovel 39 at the tip.

While the loader works, the shovel 39 has a weight and an acting force W. The acting force on the engine body 3 and the clutch housing 5 is due to the loader supporting bracket 2 and the connecting plate 36. Since the entire connecting portion between and 5 is rigidly configured, the connecting portion does not loosen or open.

In addition, in the mounting structure using the loader support bracket 2 as described above, instead of the connection by the connection plate 36, the connection bracket 7 is used as shown in FIG. 5, and the rear end upper part of the engine body 3 and the front end of the clutch housing 5 are connected. It is also possible to connect the upper part with bolts or the like. The engine body 3 is connected by the connection bracket 7.
The looseness and opening of the connecting portion between the clutch housing 5 and the clutch housing 5 are eliminated.

Next, mainly based on FIG. 6, in the hydraulic circuit for hydraulically operating the front loader 1, a pressure sensor 40 for detecting the internal pressure of the lift cylinder 37.
Is provided, and the hydraulic pressure is displayed on the multi-eye 42 via the controller 41 or by the alarm 43.
Further, the hydraulic pressure by the pressure sensor 40 and the loader arm 2
The height sensor 45 detects the height of the vehicle 8, and the automatic transmission 44 for traveling is displayed, and the shift control is performed. It informs the operator whether the weight W held by the front loader 1 exceeds the maximum allowable force, what percentage of the current weight is relative to the maximum amount, etc., to facilitate the work operation safely. It is what you want to do.

The hydraulic circuit is connected from the hydraulic pump 46 to the lift cylinder 37 via the lift control valve 47, and is further connected to the dump cylinder 38 via the dump control valve 48. 49 is a shunt valve, 50 is a pilot check valve,
Reference numeral 51 is a brake valve, 52 is anti-cavitation, 53 is an ascending relief valve, 54 is a dump relief valve, and 55 is a scooping relief valve. The pressure sensor 40 is provided on the ascending relief valve 53 side of the ascending side circuit 56 between the ascending / descending control valve 47 and the lift cylinder 37.

Next, mainly based on FIGS. 7 to 9,
A minute lift switch 58 for slightly moving up and down with respect to this lifting is provided in the grip portion of the lifting operation lever 57 on the operation console 59 for lifting the front loader 1.
By operating the raising / lowering operation lever 57, the front loader 1 is raised / lowered to a substantially desired position, and here, the minute lift switch 5 is moved.
8 is turned on and off to raise and lower slightly to control it to the target position. In FIG. 7, the minute lift switch 58 has a lever shape, and in FIG. 8, it has a push button shape.

The elevating control valve 47 is operated via an electromagnetic proportional solenoid operated by an electronic output from the controller, and the elevating operation lever 57, the minute elevating switch 58 and the like operate the proportional solenoid via the controller. It is configured to output. Lifting lever 57
The duty ratio changes as shown by the line C depending on the inclination angle of (FIG. 9). At each position, the duty ratio is finely adjusted within the predetermined width D range by the fine lift switch 58. When the duty ratio is at the point E on the line C, if the minute lift switch 58 is held ON, the duty ratio is on the horizontal line S even if the tilt of the lift operation lever 57 changes between F and G. . This operation lever 57 corner is FG
When it changes over a period of time, it changes to the side where the upper limit line H or the lower limit line L of the predetermined width D area contacts the points F and G. When the minute lift switch 58 is turned off,
The value is changed to a value on the line C corresponding to the inclination of the lever 57 at this time.

The operating speed of the loader can be kept constant even if the inclination of the elevating and lowering lever 57 changes slightly due to vibrations during traveling or an unstable posture of the driver.
Stable work can be performed. Next, mainly in FIG.
The configuration of the instrument panel 60 displayed on the dashboard 15 as a liquid crystal will be described with reference to FIGS. Display the pointer 61 displayed on the instrument panel 60 on the liquid crystal,
The tachometer 62 (FIG. 10), the speed meter 63 (FIG. 11), the working speed meter 64 (FIG. 12) and the like are switched to various display modes for selective display. The vehicle speed sensor 6 is provided on the input side of the liquid crystal display meter controller 65.
6, an engine sensor 67 for detecting the engine speed,
A mission sensor 68 for detecting the number of revolutions of the mission,
A shift sensor 69 for detecting a shift position, a tachometer 62, a speedometer 63, a changeover switch 70 for changing over and selecting a display mode of the working speed meter 64, and the like are provided. On the output side, a liquid crystal pointer 71 is displayed, and a liquid crystal scale 72 and a color liquid crystal unit 74 for color display 73 are provided.

A tachometer 62 is operated by the changeover switch 70.
If the display mode of is selected, the engine speed detected by the engine sensor 67 indicates the liquid crystal pointer 71 and the liquid crystal scale 7.
2, and a color display 73 or the like is displayed on the liquid crystal display of the instrument panel 60 (FIG. 10). Further, when the changeover switch 70 is switched to the display mode of the speedometer 63, the working speed meter 64, or the like, the detection of the vehicle speed sensor 66 or the like,
Depending on the detection of the mission sensor 68 and the like, the liquid crystal pointer 71 and the liquid crystal scale 72 interlocked with these are switched and displayed (FIGS. 11 and 12).

[Brief description of drawings]

FIG. 1 is a side view of a loader support bracket portion.

FIG. 2 is a perspective view of a part thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a side view of the tractor showing its mounting state.

FIG. 5 is a side view and a perspective view of a connecting bracket portion showing another embodiment.

FIG. 6 is a hydraulic circuit diagram of the front loader.

FIG. 7 is a plan view and a side view of the lifting operation lever portion.

8A and 8B are a plan view and a side view of an elevating operation lever portion showing a partial different embodiment thereof.

FIG. 9 is a graph showing the relationship between the tilt angle of the lifting operation lever and the duty ratio.

FIG. 10 is a plan view showing a tachometer display of the instrument panel.

FIG. 11 is a plan view showing a speedometer display of the instrument panel.

FIG. 12 is a plan view showing a display of a working speed meter on the instrument panel.

FIG. 13 is a block diagram of the display control.

[Explanation of symbols]

1 lift cylinder 2 Loader support bracket 3 engine body 4 Front axle bracket 5 Clutch housing 6 Rear plate 7 Connection bracket

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Claims (2)

[Claims] 1. A loader support bracket 2 for mounting and supporting a front loader 1 on an upper portion is mounted between a front axle bracket 4 on a side portion of an engine body 3 and a side portion of a clutch housing 5 on a rear side, and these engine bodies are also attached. A front loader mounting device characterized in that it is connected to an upper portion of a rear plate 6 interposed between the clutch housing 3 and the clutch housing 5. 2. A loader support bracket 2 for mounting and supporting a front loader 1 on an upper portion is mounted between a front axle bracket 4 on a side portion of an engine body 3 and a side portion of a clutch housing 5 on a rear side. A front loader mounting device, characterized in that an end face and an upper portion of the clutch housing 5 are connected by a connecting bracket 7.