JPH0463650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a frame structure of a small working machine such as a power lawn mower.

(Prior art) A small working machine, such as a power lawn mower, is equipped with an engine that rotates lawn mowing cutters.
It also drives the wheels for traveling. The body of such a lawnmower consists of a frame that supports the engine, wheels, cutter, etc., and a housing and covers that cover these.The frame supports the engine, the front wheels, and the like.
It supports the rear wheels, transmits power to the rear wheels, and supports the drive mechanism.

(Technical problem to be solved by the invention) The conventional frame structure described above has a complicated structure, is troublesome to manufacture, and is expensive.
The rear wheel transmission system and drive system housing are required separately on the frame due to dust-proofing requirements, which increases the number of parts and weight, and the frame has a structure that supports these. Disadvantages include that the frame becomes large, which is not desirable in terms of miniaturization, and that the overall cost increases because a dust-proof housing for the drive system is attached separately from the frame.

The present invention has been made to solve the above technical problems, and its purpose is to simplify the frame structure, facilitate manufacturing, reduce weight and compactness, and reduce the cost of lawn mowers, etc. To provide a frame structure of a working machine that can be lowered.

(Means for Solving the Technical Problems) The means for solving the above technical problems is to combine a pair of left and right reduction cases 21, 22 in front or behind the frame 7 of the work machine, and 22 accommodates deceleration transmission parts 30, 31, and 32 for the drive wheels 4, and rotatably attaches the drive wheels 4, and furthermore, there is a structure between the reduction cases 21 and 22 to prevent the reduction case from falling down. The reinforcing material 27 is stretched across the vehicle width direction.

Note that the reinforcing material 27 is made hollow, and this reinforcing material 27
It is preferable to pass the drive shaft 25 for the drive wheels 4 inside.

In addition, in the case where the wheel 3 is placed behind or in front of the frame 7, the wheel 3 is connected to a horizontally arranged support rod 11 bolted to the frame 7, and an arm-shaped support rod 11 attached at right angles to the support rod. It is preferable to attach it to the frame 7 via the stay 13.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a power lawn mower 1 as an example of a working machine.
This is a schematic side view of the fuselage 2, with front wheels 3 consisting of road wheels on the front left and right, and rear wheels 4 consisting of drive wheels on the rear left and right, and an engine 5 mounted on the fuselage 2. A handle 6 extends from the rear portion so as to be tilted rearward and upward.

The fuselage 2 consists of a frame 7 and a housing 34, and the frame 7 is as shown in FIGS. 2 and 3. The frame 7 includes a circular container-shaped main body 701, on which the engine 5 is mounted and supported. There is. A bearing boss 703 is formed in the center of the bottom 702 of the main body 701, and a cutter drive shaft 803 fixed and suspended from the center of the outer 802 of the clutch mechanism 8 housed in the main body 701 is passed vertically through the bearing boss 703 to connect the bearing 9.
The cutter 10 is fixed to the lower end of a shaft 803 which is rotatably supported through the shaft 803 and is suspended below the boss portion 703. The engine 5 is a vertical engine with a vertical crankshaft, and its vertical output shaft 5
A clutch inner 801 is fixed to the lower end of the clutch, and the inner 801 and outer 802 are connected at a predetermined engine speed.
engages and drives the cutter 10 to rotate.

Two arms 704, 704 are provided on the front left and right sides of the frame 7 so as to extend forward, and the support rod 11 is horizontally suspended on the tips 704a, 704a of these arms.
A stop member 705 is placed from above, and the end portion is connected with a bolt 12, and the support rod 11 is horizontally mounted and supported between the end portions of the arms. The support rod 11 supports the left and right sides of the intermediate portion on the arm tip portions 704a, 704a, and the stays 13, which are approximately inverted L-shaped in side view, are provided at both ends of the support rod 11.
The bases 131, 131 of the stays 13, 13 are mounted and supported, and the support shafts 301 of the front wheels 3, 3 are mounted and supported on the tips 132, 132 of the stays 13, 13, thereby supporting the frame 7.
The front wheels 3, 3 will be supported.

A support stay 706 is provided rearwardly at the rear intermediate portion of the main body 701 of the frame 7, and a bearing boss portion 707 is provided at the rear end of the stay 706, on which the driven pulley 14 is supported rotatably within a horizontal plane. It is supported via a shaft 141. The pulley 14 is attached to the front output shaft 5.
The drive pulley 15 is connected to the drive pulley 15 fixedly attached to the shaft 501 via a belt 16, and the drive pulley 15 plays with the shaft 501 and engages with the clutch outer 802, so that it rotates together with the cutter 10.
The power is connected to and disconnected from the belt 16 by tightening the belt 16 by the clutch roller 17. An intermediate transmission shaft 18 is suspended horizontally on the pulley 14, and a pair of left and right friction disks 19, 20 are disposed on the shaft 18 so as to rotate integrally with the shaft and to be movable in the axial direction. A small-diameter friction roller 142 provided integrally therewith faces, and one of the friction disks 19 and 20 is moved in the axial direction by sliding between one side and the roller 1.
42 causes the shaft 18 to rotate selectively in forward and reverse directions.

Two arms 708 and 709 are provided on the rear left and right sides of the main body 701 of the frame 7 so as to extend rearward and outward, and the base 211 of the reduction case 21 on this side is connected to the base 708a of one arm 708. The base 221 of the reduction case 22 on this side is tied to the base 709a of the other arm 709, and both ends 181, 182 of the aforementioned shaft 18 are attached to the bases 211, 221 laterally via the bearings 23. It is supported by a rack. On the other hand, the reduction case 21 has a base 21
The main body 212 extends downward and rearward from the main body 212, and a thick support boss portion 213 protrudes inward at the middle of the main body 212.
The support shaft 401 of the rear wheel 4 on this side is attached to the boss portion 214 by the bearing 2.
4, an internal gear 102 is provided on the inner inner periphery of the rear wheel 4, and a seal edge provided on the outer periphery of the main body 212 is provided on a stepped portion 403 provided on the inner end of the outer periphery of the rear wheel 4. are in close proximity and a dust-proof seal is applied.

The main body 222 of the other reduction case 22 is provided with a support boss 223 that protrudes inwardly and a bearing boss portion 224 that protrudes outwardly. The rear wheel 4 is rotatably supported, and is provided with an internal gear 402 on the inner periphery of the rear wheel 4 in the same manner as described above.

A final drive shaft 25 is horizontally mounted between the support boss portions 213 and 223 of the left and right reduction cases 21 and 22, and both ends 251 and 252 of the shaft 25 are extended to the inside of the left and right rear wheels 4 and 4, respectively. Pinion 2 on the outer end
6, 26 are fixedly installed, and internal gears 402, 40
2, the hollow cylindrical reinforcing member 27 is exposed between the opposing inner end surfaces of the boss parts 213 and 223, the shaft 25 is passed through this, and the flanges 271 and 272 at both ends of the reinforcing member 27 are connected to the boss part. It is fastened to the end faces of 213 and 223 with bolts 28... In this way, the left and right reduction cases 21 and 22 are connected by the cross member.

One side 252 of the drive shaft 25 is long, and both ends are rotatably supported by bearings 29 on boss parts 213 and 223, and the long end 252 on the reduction case 22 side
A driven sprocket 30 is fixedly installed on the outer side of the bearing 29, while the end 18 of the transmission shaft 18 on this side
A driving sprocket 31 is fixedly installed on the extending portion 183 of No. 2 and connected by a chain 32. As a result of the above, the output of the shaft 18 is outputted to the shaft 25 through the sprocket 31, chain 32, and sprocket 30, and then to the pinions 26, 2.
6 and the internal gear 402 engage the rear wheels 4, 4.
is rotationally driven and runs and moves. By the way, the outside of the base to middle part of the reduction case 22 on this side is covered with a cover 33, with its extending end 331 facing the inner end outer circumferential side of the rear wheel 4 on this side, and sealed in the same manner as described above. There is.

By the way, the lower side of the frame 7 is covered with the housing 34, and the housing 34 hangs down in a bowl shape so that the middle part 341 covers the main body 701 of the frame 7, and covers the space between the bottom 342 of the middle part 341 and the cutter 10. 3 in Fig. 2.
6 and 37 are open parts 34 at the front and rear of the housing 34
It is a swingable door plate that closes 3,344.

(Effects of the Invention) As is clear from the above, in the present invention, the frame 7 and the reduction cases 21, 22 are separated and assembled using bolts or the like, so the frame 7 itself can be made smaller. In addition, transmission parts 30, 31, 32 such as sprockets and chains are installed in case 2.
1 and 22, the transmission parts can be easily dust-proofed simply by making the cases 21 and 22 airtight. Since the reduction cases 21 and 22 are connected by the reinforcing member 27, it is possible to prevent the reduction cases 21 and 22 from falling down, and the rigidity of the entire structure is increased.

Furthermore, the reinforcing material 27 is made hollow, and this reinforcing material 27
If you pass the drive shaft 25 for the drive wheel 4 inside the
There is no need to separately prepare a safety cover for the drive shaft 25, and the number of parts can be reduced and compactness can be achieved.

Further, the rear or front wheel 3 of the frame 7 can be attached to the frame 7 via a horizontally arranged support rod 11 bolted to the frame 7 and an arm-shaped stay 13 attached at right angles to this support rod. For example, the height of the wheel 3 can be adjusted simply by rotating the support rod 11.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic side view of a lawn mower as an example of a working machine, FIG. 2 is an explanatory cross-sectional plan view of the same, and FIG. FIG. 4 is an explanatory vertical cross-sectional rear view of the reduction case section. In the drawing, 3 and 4 are wheels, 5 is an engine, 7 is a frame, 701 is a main body, 204 is a front arm, 1
1 is a support rod, 13 is a stay, 708 and 709 are rear arms, 21 and 22 are reduction cases, 2
5 is a drive shaft, and 27 is a holding member.

Claims (1)

[Scope of Claims] 1. A self-propelled working machine that cuts grass, grass, or legumes while driving a drive wheel 4 and working implements such as a cutter using an engine 5 mounted on a frame 7. A pair of left and right reduction cases 21, 22 are connected before or after the , and deceleration transmission parts 30, 31, 32 for the drive wheels 4 are housed in these reduction cases 21, 22, and the drive wheels 4 can be freely rotated. A self-propelled working machine, which is attached to the reduction case 21 and 22, and further includes a reinforcing material 27 extending in the vehicle width direction between the reduction cases 21 and 22 to prevent the reduction case from falling over. 2 The reinforcing material 27 is made hollow, and this reinforcing material 27
The self-propelled working machine according to claim 1, wherein a drive shaft (25) for the drive wheel (4) is passed through the interior of the self-propelled working machine. 3 In the case where the wheel 3 is arranged behind or in front of the frame 7, the wheel 3 includes a horizontally arranged support rod 11 bolted to the frame 7, and an arm-shaped support rod 11 attached at right angles to the support rod. Claim 1 characterized in that it is attached to the frame 7 via a stay 13 of.
The self-propelled work machine described.