JPH0241939A - Mobile agricultural machine - Google Patents

Abstract

PURPOSE:To make small yoke angles of universal joints on respective drive shafts by making a main frame in a state in front up, and connecting a crank shaft to a drive shaft for rear wheels on the rear end, and on the front end, to a drive shaft for work machine driving below the main frame via a belt mechanism. CONSTITUTION:A main frame 1 is supported by front wheels 8 and rear wheels 10 in a state in front up from below the rear to above the front against the ground. A crank shaft 13 of an engine 12 supported with the main frame 1 on the upper part of the front is made in parallel to the main frame 1, and the rear end thereof is connected to a rear wheel driving shaft 15 via an universal joint 14. The crank shaft 13 is attached with a pulley 21 on the front end, makes a power take out shaft 4 provided in parallel to the main frame 1 drivable via a belt mechanism 20, and is connected with a work machine driving shaft 25 via an universal joint 24. The main frame is made in a state in front up, yoke angles of respective universal joints are made in small, and therewith is intended smooth transmission of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to the structure of a mobile agricultural machine, which is a traveling vehicle to which a working machine, such as a mower working machine, is attached. This relates to the mounting angle of the machine drive shaft or rear wheel drive shaft.

(B) Conventional Technology There are various types of mobile agricultural machinery, such as lawn mowers and agricultural tractors, which are vehicles that are driven by attached mower working devices.

These vehicles have a rear wheel drive shaft for driving the rear wheels and a work equipment drive shaft for driving the work equipment, and the main frame of the vehicle also has a work equipment drive shaft at the bottom. It is installed at a high position for installation reasons or to provide greater road clearance.

(c) Problems to be Solved by the Invention For this reason, the rear wheel drive shaft and the work equipment drive shaft are inevitably installed at deep angles, and a universal joint ( The yoke angle of the yoke (hereinafter referred to as yoke) increases,
The rotation was no longer smooth, resulting in problems such as reduced transmission of driving force and generation of vibrations.

(d) Means for Solving the Problems The present invention aims to solve the above-mentioned problems. For example, as shown in FIG. and the mainframe (1
) with respect to the ground from the rear downward to the front upward.
The crankshaft (13) of the engine (12) is parallel to the main frame (1);
) a rear wheel drive shaft (15) connected to the rear end of the rear wheel drive shaft (15) via a universal joint (14); and a traveling drive bag U connected to the rear wheel drive shaft (15) to drive the rear wheel (10). (
11), a working machine (27) attached to the lower part of the main frame (1), and a belt-type power transmission device 7 (via the belt-type power transmission device 7 (201) from the front end of the crankshaft (13) to the working machine (27) attached to the lower part of the main frame (1).
A power take-off shaft (4) and a power take-off shaft (4) are attached to the front lower part of the main frame (1) parallel to the main frame (1) in order to take out the driving force for driving the main frame (1).
A universal joint (24) at both ends is provided between the working machine (27) and -.
> and (28) for transmitting driving force.

(E) Effect Based on the above-described configuration, by placing the main frame (1) in the forward upward position, the angle of the frame (1) can be brought close to the mounting angle of the shafts (15) and (25), Therefore, the angle β between the engine crankshaft (13), which is provided parallel to the main frame (1), and the rear wheel drive shaft (15) becomes small, and the yoke angle becomes small.

Similarly, the angle β between the power take-off shaft (4), which is provided parallel to the main frame (1), and the work a drive shaft (25) is also reduced, and the yoke angle is reduced.

It should be noted that the above reference numerals in parentheses are merely used to explain the drawings and do not limit the present invention in any way.

(F) Example Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 is an overall schematic diagram of the mobile agricultural machine of this embodiment.

FIG. 2 is a cross-sectional view of FIG. 1, showing the front wheel side. There is a pair of main frames 1 on the left and right of the moving #1 vehicle.
exists. A front axle mounting support 2 is provided at the front lower part of the main frame 1 in the vehicle width direction. This front axle mounting support 2 has an inverted U-shaped cross section, and an axle center 3 is passed through this inverted U-shaped cross section and is provided in the vehicle width direction. This axle center 3 is longer than the front axle mounting support 2 and has a similar inverted U-shaped cross section. At the center of the axle center 3 and the front axle mounting support 2, a power take-off shaft 4, which will be described later, is attached to an axle center bin 5.
It also serves as a through-hole. Axle center 3
King pin support 6 or caster angle α (approximately 3
6) (see Figure 1). A pin (t) inserted and attached to this king pin support 6 has an inverted shape as shown in FIG. 2, and a front wheel 8 is attached to the tip of the king pin 7. A carrier boat 9 is provided at the rear end, and a rear wheel 10 is attached to the rear wheel 1o.
f, 11.

Furthermore, due to the mounting positions of the axles of the front wheels 8 and rear wheels 10 and the differences in the diameters of the rear wheels and front wheels, the main frame 1 rises from the rear lower side toward the front upper side with respect to the ground. It is composed of An engine 12 is mounted on the front upper part of the main frame 1, and a crankshaft 13 is parallel to the main frame 1.

Further, a rear wheel drive shaft 15 is connected to the rear end of the crankshaft 13 via a yoke (the same applies below to a universal joint) 14, and a driving drive device 11 including a hydraulic transmission etc. is connected via a yoke 16. is connected to. Further, the front wheels 8 are provided with a steering mechanism 17 for steering the front wheels 8,
It is connected to a steering wheel 19 via a steering shaft 18.

-4. A belt type drive transmission device 20 is provided at the front end of the crankshaft 13 of the engine 12. That is, a pulley 21 is provided on the crankshaft 13, and power is transmitted via a belt 22 to a pulley 23 of a power take-off shaft 4 for the working machine. This power shaft output shaft 4 also serves as the axle center bin 5, is provided passing through the axle mounting support 2 and the axle center 3, and is parallel to the main frame 1. This power take-off shaft 4 is connected to a rear wheel drive shaft 25 via a three-way 24, and this rear wheel drive shaft 25 is further connected to a working machine 27 via a yoke 26. This working machine 27 is a lawn mower called Mo 7, but it is not necessarily limited to Mo 7, and may be any other working machine. This Mo 7 has wheels 28 and 29 at the front and rear, and It is designed to move at regular intervals, and is attached so that it can be moved up and down by a hanging mechanism 31.

'Also, a pulley (not shown) is provided at the 1stIk end of the crankshaft of the engine 12, and a belt (not shown) is connected to the engine 12.
Power is transmitted to another pulley provided on the engine 12 side parallel to the crankshaft 13, and this another pulley rotationally drives the cooling fan 32.

This cooling fan 32 cools the engine 12 by sending cold air from the rear to the front of the vehicle. A radiator 33 is located further behind the cooling fan 32.

Next, the tension clutch provided in the belt type power transmission device 20 will be explained with reference to FIGS. 3 to 7.

As shown in FIG. 3, the tension clutch controls the belt pressing force that exists between the pulley 21 on the crankshaft 13 side (hereinafter referred to as the driving pulley) and the pulley 23 on the power output shaft side (hereinafter referred to as the driven pulley). This is a device that engages and disengages the clutch by loosening it and reducing the tension. The tension pulley 40 that performs this pressing is provided at the tip of one of the three protrusions 42, 43, 44 of the rotating member 41.
is rotatable about a rotation support point 45. Furthermore, a protrusion 4 that is located on the opposite side of the rotation fulcrum 45 with respect to the protrusion 42 on which the tension pulley 40 is provided is provided.
A friction member 46 is affixed to the tip of 3. Further, the third protrusion 44 is provided with a spring 47 and biased in one direction, and a clutch wire 48 is connected to the other direction. And this clutch wire 4
Reference numeral 8 denotes a flexible pipe 49 in which a wire 50 is passed through, and one end of this wire 50 is connected to the protrusion 4.
4, and the other end is attached to a clutch lever 51. Further, the clutch lever 51 is connected to the seat 52 (
(see Figure 1).

Furthermore, FIG. 4 shows a sectional view of the driven pulley 23, in which two belts 22 are provided on the pulley 23, and the friction member 46 is inserted into an edge circumferential groove having a V-shaped cross section of the pulley 23. In order to press the pulley 23 by pressing the pulley 23, its shape has a substantially V-shaped cross section. However, instead of having such a V-shape, the driven pulley may have a friction member having a flat contact surface and a flat contact surface.

Next, the operation of the tension clutch will be explained.

As shown in FIG. 3, when the clutch lever 51 is moved in the r-in direction, the wire rod 50 rotates the rotating member 41, the tension pulley 40 presses the belt 22, and the tension of the belt 22 is increased. do. As a result, the driving force is transmitted and the clutch is in the engaged state. As shown in FIG. The rotating member 41 is returned to its original state. This causes the tension pulley 40 to loosen the force pressing the belt 22 and
The tensile force of the clutch becomes smaller and the clutch becomes disengaged. At this time, at the same time, the friction member 46 of the rotating member 41 comes into contact with the driven pulley 23 and applies a brake to the driven pulley 23. This brake is based on the force of the spring 47.

In this way, the brake of the driven pulley 23 can be applied at the same time as the tension clutch is disengaged. When the work equipment is a mower that drives dangerous objects such as rotating blades, it is desirable to stop the work equipment at the same time as the clutch of the transmission system that transmits the driving force is disengaged. The standards require that the work equipment be stopped within 5 seconds. For this reason, some mobile agricultural machines are equipped with expensive braking means, such as an electromagnetic clutch brake, for stopping the working machine.

However, this embodiment uses an inexpensive tension clutch, has a structure in which the brake is applied in conjunction with the action of disengaging the tension clutch, and can stop the work machine with a simple structure. In particular, as shown in FIG. 4, by using the V-shaped groove and the V-shaped friction member, a large braking force can be obtained with a small spring force due to the wedge effect. In addition, in FIGS. 3 to 5, the driven pulley 23
The friction part of the driven pulley 2 has a V-shaped cross section, but the driven pulley 2 is not limited to this and has a flat drum-shaped friction part.
3 may be adopted.

Further, as shown in FIG. 6, a spring 52 having a larger spring constant than the spring 47 is interposed between the wire 50 and the protrusion 44 of the rotating member 41, so that even if the belt 22 is stretched, the spring 47 is not attached. The force follows the pulley 40 or the belt 22, so that when the clutch is engaged, the pulley 1
It may be configured such that an appropriate frictional force is always obtained between 3 and 23.

In addition, in the embodiment described above, the clutch is engaged when the wire wire 50 is pulled by the clutch lever 51, but as shown in FIG. It may be configured such that the clutch is reversed and the clutch is disengaged when the wire 50 is pulled by the clutch lever 51.

Next, an explanation will be given of the operation of this embodiment in which the main frame is in the upstream state.

As described above, by placing the pair of main frames 1 provided on the left and right sides of the vehicle in a forward upward position with respect to the ground, the main frame 1 has a frame inclination a with respect to the ground. This α
By making it almost the same angle as the front wheel caster angle α (approximately 3 degrees), there is no need to intentionally set the front wheel caster angle as in the conventional case. In other words, the conventional main frame is parallel to the ground, and it is necessary to add a front wheel caster angle α to the front axle to improve operability. , 90°, the caster angle is shifted from the caster angle. Alternatively, a manufacturing structure has been adopted in which the center bin 5, which is provided through the axle center 3, is not completely parallel to the through hole but is mounted offset by the caster angle. For this reason, it was difficult to manufacture and had low strength. However, by inclining the main frame itself by the frame inclination α as in this embodiment, the king pin support 6 is set at a right angle (the first
(see figure), and the axle center pin 5 can be provided straight, that is, parallel, to the through hole of the axle center 3. Therefore, each joint has a simple shape, can be closely attached, and has high strength. In addition, the structure that makes the main frame 1 slope is that the front wheel 8 and the rear #11
Due to the difference in the diameter of 0 and the difference in the vertical direction between the mounting positions of the front wheels 8 and the rear wheels 10, it is possible to easily tilt the wheels, and moreover, it is possible to make the left and right caster angles the same. Therefore, it is possible to improve the accuracy of the caster angle and at the same time reduce operational troubles when driving the vehicle.

Furthermore, in a mobile agricultural machine in which the power take-off shaft 4 also serves as the axle center bin 5, as in this embodiment, the driven pulley 23 of the power take-off shaft 4 has a large diameter in order to perform a deceleration action, and the load clearance is inevitably small. It was something that would become. However, by placing the main frame 1 in the forward upward position, the road clearance can be increased accordingly, and the off-road running performance can therefore be improved.

In addition, the yoke angle β of the rear wheel drive shaft 15 and the working machine drive shaft 25 can be made smaller, rotation becomes smoother, the drive force transmission rate is improved, and the generation of vibration can be suppressed.

(g) As described in detail, according to the present invention, the mainframe (
By setting 1) in the forward upward position, the angle of the universal joint (yoke) between the rear wheel drive shaft (15) and the work equipment drive shaft (25) can be made smaller, thereby making rotation smoother. It is possible to improve drive transmission performance and reduce vibration. Furthermore, the rear of the mobile agricultural machine is lowered, and the traveling drive device 11, which is a heavy object installed at the rear, is placed in a lower position, which lowers the center of gravity and increases the overturning angle of the vehicle, making it easier to use during work. Safety can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram showing one embodiment of the mobile agricultural machine of the present invention, Fig. 2 is a sectional view of Fig. 1, Fig. 3 is a schematic diagram of a tension clutch, and Fig. 4 is a driven pulley of Fig. 3. 23, FIG. 5 is a diagram showing the state and state of the clutch when it is young. 6 and 7 are diagrams showing other embodiments of the tension clutch. 1... Main frame, 4... Power take-off shaft 8.
...Front wheel, 10...Rear wheel 11...Travel drive device 12...Engine 13...
Crankshaft, 14, 16, 24. 26... Universal joint (yoke), 15... Shaft for rear wheel drive 27... Working machine (mower), 20... Belt type drive transmission device 25...・Agricultural machine drive shaft Fig. 3 Fig. Fig. 11 Personnel

Claims (1)

[Claims] 1. Front wheels and rear wheels that are attached to the front and rear of the main frame and support the main frame from the rear downward to the front upward from the ground, the engine mounted on the front upper part of the main frame, and the main frame. a crankshaft of the engine parallel to the engine; a rear wheel drive shaft connected to the rear end of the crankshaft via a universal joint; and a rear wheel drive shaft connected to the rear wheel drive shaft to drive the rear wheels. a drive device installed at the lower part of the main frame, and a drive device attached to the front lower part of the main frame for extracting the driving force for driving the work tool from the front end of the crankshaft via a belt-type power transmission device. A mobile agricultural machine comprising: a power take-off shaft provided parallel to a main frame; and a work machine drive shaft provided between the power take-off shaft and the work machine via universal joints at both ends to transmit driving force.