JPH052049Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a housing structure for a lawn mower.

PRIOR ART

Self-propelled lawn mowers drive the rear wheels to rotate.
Power from the engine is transmitted via a belt to the input shaft of a transmission located at the rear, which rotates the rear wheel shaft.

[The problem that the idea attempts to solve]

The belt is stretched in a box-shaped housing that is open from the bottom, and if maintenance of this belt is performed from above, the engine mounted on the housing will get in the way and work efficiency will be poor. It has a face.

This idea was made in view of the above circumstances.
An object of the present invention is to provide a housing structure for a lawn mower in which belt maintenance can be performed from below the housing.

[Means to solve the problem]

The structure of the present invention is that a belt that transmits engine power to the input shaft of the transmission is stretched in a box-shaped housing that is open from the bottom, and a belt that transmits the power of the engine to the input shaft of the transmission is stretched over and around the cutter blade in the lower part of the transmission belt inside the housing. A lawn mower in which a part of the housing scroll part for guiding cover mown grass is disposed is characterized in that the housing scroll part below the belt is separable and can be detached from below the housing.

[Effect]

At the time of belt maintenance, the splittable housing scroll section at the lower part of the belt is removed from the lower part of the housing, and the belt maintenance is performed from below the housing. Therefore, belt maintenance work can be easily performed without being disturbed by the engine or the like on the housing.

〔Example〕

Fig. 1 is a perspective view of the lawn mower, Fig. 2 is a perspective view of the housing, Fig. 3 is a bottom view of the housing, Fig. 4 is a plan view of the housing with the scroll piece assembled, and Fig. 5 is a perspective view of the housing. FIG. 3 is a longitudinal sectional view of the housing with the scroll piece assembled thereto.

As shown in FIGS. 1 and 5, the lawn mower 1 has an engine 3 mounted in the center of a housing 2, and a drive shaft 4 of the engine 3 extends vertically downward and passes through the housing 2. A cutter blade 5 is fixed to its lower end, and the cutter blade 5 is rotationally driven by an engine 3 to cut the grass.

As shown in FIGS. 1 to 5, the housing 2 is a downwardly open box member with a cutter blade 5 disposed approximately in the center.
, a pair of left and right front walls 7 extend forward from the front of the surrounding wall 6, and a pair of left and right rear walls 8 extend rearward from the rear of the surrounding wall 6. The upper surface of these is the upper wall 9, and the front part is the front wall 1.
0, the rear surface is closed by the rear wall 11. and,
When the housing 2 is viewed from the side, the upper wall 9 has a shape that is inclined rearward and upward.

The portion of the upper wall 9 located at the center of the peripheral wall 6 is formed into a lower concave shape to form a horizontal and flat engine mounting base portion 12.
The base portion 12 is connected to the surrounding upper wall 9 by a raised wall portion 13, and boss portions 15 having attachment holes 14 are provided at several locations in the circumferential direction of the base portion 12. The engine 3 is placed on the base 12, the drive shaft 4 is inserted through an opening 16 provided in the center of the base 12, and the cutter blade 5 is fixed to the lower end.

As shown in FIGS. 3 and 4, a partition wall 17 is provided at the rear of the peripheral wall 6 in the housing 2 in the middle part in the left-right direction, and one side is used as a discharge duct 18. Extension wall 1 of this partition wall 17
9 is provided in the peripheral wall 6 to form the inside of the peripheral wall 6 in a scroll shape.

On the other hand, as shown in FIG. 1, the lawn mower 1 includes front wheels 20 and rear wheels 21 at the front and rear of the housing 2, and is configured to be able to run by itself by rotationally driving the rear wheels 21 by an engine 3. .

That is, as shown in FIG.
A belt 27 is wound around a driven pulley 26 attached to an input shaft 25 of a transmission 24 disposed in a chamber 23 adjacent to the exhaust duct 18 at the rear of the engine 3, and the power of the engine 3 is transferred to the belt 27. Therefore, the signal is transmitted to the transmission input shaft 25, rotates the rear axle via the transmission 24, and drives the rear wheels 21. In addition, as shown in FIGS. 2 to 5, the belt 2 of the engine mounting base portion 12 of the housing 2
7 is arranged in a concave shape one step lower than the other parts, and a belt hole 29 is provided at the rear of the raised wall portion 13.
The belt 27 is inserted through the housing 2 and extends rearward inside the housing 2.

As shown in FIGS. 4 and 5, a scroll piece 30 is provided below the transmission belt 27 in the housing 2.

Scroll piece 30 is shown in FIGS. 6-10. The scroll piece 30 includes an upper wall 31 surrounded by concentric arcs and a pair of straight lines substantially orthogonal to these arcs, and the upper wall 31 has a horizontal portion 31a and an inclined portion 31b continuous with the horizontal portion 31a. Equipped with Horizontal part 3
1a is disposed below the belt 27 when the scroll piece 30 is assembled into the housing 2, and its inner end abuts the lower surface of the upper wall 9 of the housing 2;
The inclined portion 31b extends along the peripheral wall 6 while being inclined upward from the horizontal portion 31a, and its inner end abuts the lower surface of the upper wall 9 of the housing 2. A pair of ribs 32 and 3 extend in the radial direction on the upper surface of both circumferential ends of the upper wall 31 of the scroll piece 30.
3, 34, and 35 are provided, and the extension wall 1 of the housing 2 is located between the pair of ribs 32 and 33 on the horizontal portion 31a side.
9, and the other pair of ribs 34, 35
The gap is inserted into a rib 36 (see FIG. 3) provided on the lower surface of the upper wall 9 of the housing 2 to regulate the position of the scroll piece 30. In this way, when the scroll piece 30 is assembled into the housing 2, the horizontal part 31a and the inclined part 31b of the scroll piece 30 cover the upper part of the cutter blade 5.

The outer end of the upper wall 31 in the radial direction has a side wall 37 that hangs downward over its entire length, and when the scroll piece 30 is assembled into the housing 2, the side wall 37 facing the horizontal portion 31a covers the circumference of the cutter blade 5. That is, in the portion of the housing 2 where the belt 27 is disposed, the side wall 37 of the scroll piece 30 is disposed as described above.
covers the circumference of the cutter blade 5.
The side wall 37 facing the inclined portion 31b is arranged along the inner surface of the peripheral wall 6 of the housing 2 adjacent to the side wall 37 facing the horizontal portion 31a.

In this way, the scroll piece 30 constitutes a part of a housing scroll part that covers around and above the cutter blade 5 and guides the cut grass.

Therefore, the grass cut by the cutter blade 5 is formed by the peripheral wall 6 of the housing 2 and the side wall 37 of the scroll piece 30, and the upper wall 9 of the housing 2 and the upper wall 31 of the scroll piece 30. It is guided through the housing scroll portion 38 (see FIG. 4) and fed into the discharge duct 18, and is transported and stored in a glass bag 39 mounted rearward through an opening provided in the rear wall 11 of the discharge duct 18.

Below, the housing 2 of this scroll piece 30
Explain the fixing structure.

A scroll piece attachment portion 40 is provided on the outer surface of the side wall 37 facing the horizontal portion 31a of the upper wall 31. This scroll piece mounting portion 40 is attached to the side wall 37.
A boss part 42 having a horizontal bolt hole 41 is provided in the middle part of the opposing part of the side wall 40b on the side of the inclined part 31b. A boss portion 44 having a vertical bolt hole 43 is provided on the outer surface of the lower portion of the opposite portion. Therefore,
A boss portion 45 (see FIG. 4) provided on one rear wall 8 of the housing 2 and the scroll piece 30
A bolt 46 is inserted into the boss portion 42 of the housing 2 and fastened to a nut 48 fixed to the insert plate 47 (see FIG. 11). ) and the boss portion 44 of the scroll piece 30,
A scroll guide bracket 50 (see FIG. 12) having a screw hole at the bottom is inserted, and a bolt 51 (52 is a washer) is fastened from below. In this way, the two rear parts of the scroll piece 30 are fixed to the housing 2.

In addition, the outer rib 3 of the horizontal portion 31a of the upper wall 31
2 is provided over the entire length in the radial direction, a scroll piece mounting portion 53 protrudes from the upper end of the inner end in the radial direction, and a vertical mounting hole 5 is provided at the tip of the scroll portion mounting portion 53.
A boss portion 55 having a diameter of 4 is provided. Also,
Also on the side of the inclined part 31b, there is a boss part 5 whose center is located on an arc that passes through the center of the boss part 55 and is concentric with the arc of the upper wall 31, and which is at the same height as the boss part 55.
6 is provided and includes a mounting hole 57. Inclined part 31
The circumferential end portion 58 adjacent to the boss portion 56 of b has a concave shape. Then, the two boss portions 55 and 56
When the scroll piece 30 is assembled into the housing 2, it is aligned with the boss part 15 of the engine mounting base part 12 of the housing 2 (see FIG. 13), and the boss part 15 of the housing 2 and the scroll piece 30 are aligned with each other.
Stud bolt 5 inserted through boss portions 55 and 56 of
9 (installed in the oil pan 3a of the engine 3) and fastens the nut 60 to the housing 2 together with the engine 3. 61 and 62 are colors, and 63 is a washers.

As described above, the scroll piece 30 is inserted into the belt 27 inside the housing 2 from below the housing 2.
Insert it into the lower position of the housing 2 in total 4 places.
Fixed. Therefore, when performing belt maintenance, the scroll piece 30 can be removed and the belt maintenance work can be performed from below the housing 2, so the work can be done without being disturbed by the engine 3, etc. on the upper part of the housing 2. Good sex. The scroll piece 30 is a part of a housing scroll part 38 that covers above and around the cutter blade 5, and the wind inside the scroll part flows well and the lawn mowing performance is also good. Also,
The scroll piece 30 also improves the rigidity of the housing 2.

[Effect of idea]

As explained above, according to the present invention, a belt for transmitting the power of the engine to the input shaft of the transmission is stretched in a box-shaped housing that is open from below.
A lawn mower in which a part of a housing scroll part that covers above and around the cutter blade and guides the cut grass is arranged in a lower part of the transmission belt in the housing, the housing scroll part in the lower part of the belt is separable, By making the housing removable from below, when performing belt maintenance, the splittable housing scroll section at the lower part of the belt is removed from below the housing, and belt maintenance is performed from below the housing. Therefore, belt maintenance work can be easily performed without being disturbed by the engine or the like on the housing.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of a lawn mower, Fig. 2 is a perspective view of a housing, and Fig. 3 is a perspective view of a lawn mower.
The figure is a bottom view of the housing, and Figure 4 is a top view of the housing showing the scroll piece assembled.
FIG. 5 is a longitudinal sectional view of the housing with the scroll piece assembled, FIG. 6 is a plan view of the scroll piece,
Figure 7 is a sectional view taken along the - line in Figure 6, and Figure 8 is a cross-sectional view of Figure 6.
9 is a sectional view taken along the line A in FIG. 6, FIG. 10 is a sectional view taken along the line - 1 in FIG.
12 and 13 are enlarged views of the fixing portion of the scroll piece, respectively. 1 is the lawnmower, 2 is the housing, 3 is the engine,
4 is a drive shaft, 5 is a cutter blade, 6 is a peripheral wall,
8 is a rear side wall, 9 is an upper wall, 11 is a rear wall, 12 is an engine mounting base part, 13 is a raised wall part, 14, 54,
57 is a mounting hole, 15, 42, 44, 45, 49,
55 and 56 are boss parts, 16 is an opening, 17 is a partition wall,
18 is the exhaust duct, 19 is the extension wall, 20 is the front wheel,
21 is the rear wheel, 22 is the drive pulley, 23 is the chamber, 2
4 is a transmission, 25 is an input shaft, 26 is a driven pulley, 27 is a belt, 28 and 58 are recessed portions, 29
30 is a belt hole, 30 is a scroll piece, 31 is an upper wall, 31a is a horizontal part, 31b is an inclined part, 32, 3
3, 34, 35, 36 are ribs, 37 is a side wall, 38
39 is a glass bag; 40 and 53 are scroll part mounting parts; 40a
is the bottom wall, 40b is the side wall, 41 and 43 are bolt holes,
46, 51, 59 are bolts, 47 is an insert plate, 48, 60 are nuts, and 50 is a scroll guide bracket.

Claims (1)

[Scope of utility model registration request] A belt that transmits the power of the engine to the input shaft of the transmission is stretched inside a box-shaped housing that opens downward, and the lower part of the transmission belt inside the housing covers the area above and around the cutter blade and guides the cut grass. 1. A housing structure for a lawn mower in which a portion of a housing scroll portion is disposed, wherein the housing scroll portion at a lower portion of the belt is separable and detachable from below the housing.