JPH0247056Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a working machine such as a front engine/rear drive type riding lawn mower.

Conventionally, in this type of work equipment, the drive system for the radiator cooling fan for the work equipment and water-cooled engine is
Each is configured separately. Therefore, there are problems such as a complicated structure and a need for space.

In view of the above points, the present invention aims to reduce the number of parts by arranging the two drive systems on the same axis, improve assembly efficiency, and achieve a compact structure. The configuration is as described in the claims.

The embodiment shown in the drawings will be specifically described.
1 is the frame, 2 is the front wheel, 3 is the rear wheel, 4 is the seat, 5 is the steering wheel, 6 is the frame 1
A water-cooled engine is mounted on the front of the machine, 7 is the bonnet, and 8 is a working machine located below the frame between the front and rear wheels.

The engine 6 described above is mounted with the crankshaft 10 facing in the front-rear direction of the riding type work machine. The crankshaft 10 projects forward and backward from the engine 6 and serves as an output shaft.

Reference numeral 9 indicates a driving power take-off shaft connected to the rear end of the crankshaft 10, that is, the rear engine output shaft through a joint 11; 12 is a propeller shaft; 13 is a clutch; 14 is a transmission; 15 and 16 are the propeller shaft 12 and the take-out shaft 9. It is a universal joint between the crank hand shaft 17.

A power take-off shaft 18 is fitted to the front end of the crankshaft 10, that is, the front engine output shaft, and is removably coupled, that is, directly connected, with a bolt 18a to form a working machine drive shaft. Brake 1 is attached to the shaft 18 from the engine 6 side.
9. By assembling the clutch 20, pulley 21, and fan 22 for cooling the radiator in that order, and arranging the radiator 23 in front of the fan 22, the front power take-off shaft, that is, the work machine drive shaft 18 can be connected to the engine 6 and the radiator. It is located between 23 and 23.

The assembly order of the brake 19 and clutch 20 may be reversed.

The work machine 8 is an example of a rotary lawn mower,
A housing 25 of the rotary blade 24 is arranged on the lower surface of the frame 1 so as to be movable up and down by a link or the like not shown in the figure. 26 is a rear stabilizing wheel of the housing 25. A belt 29 is then wound around the pulley 28 on the blade shaft and the pulley 21 on the drive shaft 18. The belt 29 is stretched in a substantially L shape via a guide ring 30.

Although the brake 19 and clutch 20 are not limited, when a work machine operating lever (not shown) is squeezed, the brake 19 is released and the clutch 20 is engaged, and the power of the engine 6 is transmitted to the work machine 8 via the pulley 22. It is desirable to have a safety mechanism in which when the lever is released, the brake 19 is activated and the clutch 20 is disengaged, stopping the working machine without stopping the rotation of the engine.

The drawings show an example of this, and FIG. 2 shows the state when the work machine is being driven. Grip the operating lever and wire 3
1. Rotate the cam plate 33 via the connecting fitting 32 to move the ball 34 to the deepest position 36a of the groove 36 of the cam plate 33 as shown in FIG. The ball holding plate 35 is a tension spring (rubber block in the case of the figure) 3
7, the ball 34 moves to the right in FIG. 2 by the distance that it falls into the groove 36a. The brake shoe 38 provided on the ball holding plate 35 separates from the annular brake plate 39, and the brake 19 is released.

When the annular brake plate 39 is released from the pressure applied by the brake shoe 38, the annular brake plate 39 and the clutch ring plate 40 integral therewith are removed.
It is pushed by the spring 41 and moves to the right in FIG. A clutch engaging element 42 provided on a clutch ring plate 40 on the opposite side to the spring 41 passes through a clutch disc 43 fixed to the drive shaft 18, and is provided on a clutch ring plate 44 that is stationary in the axial direction. The clutch 20 is inserted by pressing the engaging element 45.

The pulley 21 is rotatably supported on the drive shaft 18 by a bearing 46, and is attached to a bolt 48 provided on a clutch support member 47 fixed to the boss of the pulley 21.
The axially stationary clutch ring plate 44 is fixed;
The clutch ring plate 40 is supported so as to be movable in the axial direction via a metal 40a. Therefore, drive shaft 18 → shaft 18
Clutch disc 43 integrated with member 43a welded to
→Clutch engager 42, 45→Clutch ring plate 4
0,44→Bolt 48→Clutch support member 47→
The pulley 21 rotates and is transmitted to the working machine 8 via a belt 29.

A plurality of the tension springs 37 are provided on the circumference. In the illustrated example, metal rings 50 and 51 are baked inside and outside the annular rubber 37, and the outer metal ring 51 is attached to the ball support plate 37.
The inner metal ring 50 is fitted onto a bolt 52 fixed to the engine so as not to rotate. A plurality of clutch ring plate support bolts 48 are also provided on the circumference.

When the operating lever is released, the cam plate 33 is returned to the direction of arrow a in FIG. 3 by a return spring not shown in the figure, and moves to the left while pushing the ball 34 up to the shallow side of the cam groove 36. Therefore, brake shoe 3
8 presses against the annular brake plate 39 to apply the brake, and as the plate 39 is further pushed, the clutch ring plate 40, which is integral with the plate 39, moves to the left against the spring 41, and the clutch 20 is disengaged. Therefore, even if the engine is running, the power to the working machine 8 is cut off, so when the emergency operating lever is released, the rotary blade 24 immediately stops, thereby preventing injury.

However, as the brake 19 and clutch 20, other mechanisms having the above-mentioned operating purpose may be used as appropriate.

The radiator cooling fan 22 may be either blow-out cooling or suction cooling, but a wind guiding cover 55 is provided surrounding the fan. As shown in FIG. 4, the lower part of the cover is divided into parts 55a so that it can be freely attached and detached, making it convenient to attach and detach the belt 29.

As mentioned above, the riding type work machine of the present invention is of a front engine/rear drive type.
The engine is mounted with its crankshaft facing the front and back direction of the riding type work machine, and the crankshafts protrude from the front and rear of the engine to serve as engine output shafts, and the power take-off shaft for traveling is connected to the rear engine output shaft. In addition, since the work equipment drive shaft is directly connected to the front engine output shaft, there is no extra output shaft, and the number of parts related to the output shaft is reduced.The volume occupied by the engine is small, and the work equipment and cooling fan described later Together with the compactness of the drive system, this is effective in reducing the size of the aircraft.

As mentioned above, the riding work machine of the present invention has a belt pulley and a belt pulley connected from the engine side to the brake, clutch, and work machine on the crankshaft provided on the front side of the engine, that is, the work machine drive shaft that is directly connected to the output shaft of the engine. The radiator cooling fans are installed in that order, that is, the work equipment drive system and the radiator cooling fan drive system are installed on the same axis, which simplifies the configuration around the engine compared to a system with separate drive systems. It also becomes more compact in terms of space.

Further, the brake, clutch, pulley, fan, etc. are pre-assembled onto the working machine drive shaft which is directly connected to the output shaft of the engine, and the work machine driving shaft is fixed to the output shaft, thereby making it extremely easy to assemble.

Because the configuration around the engine becomes more compact,
The diameter of the fan is increased and there is enough space between the radiator pulleys at the front and rear of the fan, making it easy to attach and detach the belt. Since the large-diameter fan and radiator are placed in front on the same axis as the engine's output shaft as mentioned above, cooling efficiency is good, and it also has the effect of lowering the atmospheric temperature inside the bonnet and removing dust. There is.

[Brief explanation of the drawing]

Figure 1 is a side view of the riding type work machine of the present invention, Figure 2 is an enlarged longitudinal sectional side view of the front part of the engine, Figure 3 is an explanatory diagram of the operation of the brake operation cam, and Figure 4 is the back side of the wind guide cover. It is a diagram. 1 is a frame, 2 is a front wheel, 3 is a rear wheel, 4 is a seat, 5 is a handle, 6 is an engine, 8 is a work machine,
9 is a power take-off shaft for driving, 10 is a crankshaft, 12
18 is a propeller shaft, 18 is a working machine drive shaft, 19 is a brake, 20 is a clutch, 21 is a pulley, 22 is a fan, 23 is a radiator, and 55 is a wind guide cover.

Claims (1)

[Scope of utility model registration request] In a front-engine/rear-drive riding type work machine, the engine is mounted with the crankshaft facing in the front and back direction of the riding type work machine, and the crankshaft is made to protrude from the engine in the front and rear directions as the engine's output shaft, respectively. A power take-off shaft for traveling is connected to the rear engine output shaft, and a work equipment drive shaft is directly connected to the front engine output shaft, and a brake and clutch are connected to the work equipment drive shaft from the engine side.
A riding type work machine in which a belt pulley leading to the work machine and a fan for cooling the radiator are installed in that order, the radiator is placed in front of the fan, and the work machine drive shaft is located between the engine and the radiator.