JPH0534504Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine mounting structure for a working machine such as a lawnmower.

[Prior Art] In a work machine in which a cutter blade is disposed in the housing of the work machine and an engine for driving the cutter blade is disposed above the cutter blade, a plurality of mounting seats are generally provided in the engine case. are placed on the mounting seats of the housing, and the engine is mounted on the housing.

Then, screw holes are formed in the mounting seat of the engine case, and bolt insertion holes corresponding to the screw holes are formed in the mounting seat of the housing, and the bolts are tightened from the bottom of the housing into each bolt insertion hole and the screw hole. The mounting seat is tightened and fixed.

[Problems to be solved by the invention] Therefore, when assembling a removed engine into a housing during maintenance, etc., it is necessary to position the screw holes and bolt insertion holes, and to temporarily tighten multiple bolts before final tightening. Therefore, it was not possible to easily and quickly perform the engine removal/installation work.

The present invention has been devised in view of the above-mentioned circumstances, and an object of the present invention is to relate to an engine mounting structure for a working machine that allows the engine to be easily and quickly removed.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention forms a first collar made of a heat insulating material in which a body part and a flange part are integrally formed, and a first collar is formed above the mounting hole of the mounting seat of the housing. Then, the body of the first collar is fitted into the mounting hole by abutting the flange against the seat surface, and the body and the flange are integrally formed to form a second collar made of a heat insulating material. The flange portion is configured to abut the seat surface from below of the first collar, and the body of the second collar is fitted into the first collar, and is fixed to the mounting seat of the engine case and protrudes downward from the mounting seat. The mounting seat of the engine case is attached to the mounting seat of the housing by inserting the provided bolt into the body of either the first collar or the second collar and tightening the bolt with a nut. do.

[Function] A plurality of mounting seats can be easily positioned via bolts, temporary tightening can be omitted and final tightening can be performed immediately, and engine installation and removal work can be performed easily and quickly.

[Example] Hereinafter, a case will be described in which an example of the present invention is applied to a walk-behind lawn mower.

Figure 1 is a cross-sectional side view of the main parts of a walk-behind lawn mower, Figure 2
The figure shows a cross-sectional view of the joint between the engine case and the housing.

1 is a walk-behind lawn mower, 2 is a front wheel, 3 is a rear wheel, 4 is a handle, 5 is a housing, and an engine 6 is mounted on the housing 5.

The engine 6 is a vertical engine in which the piston 11 is oriented horizontally and the crankshaft is oriented vertically, and the lower part of the part of the engine case 13 that supports the crankshaft 12 is formed into an oil pan 14.

A cutter blade 21 is attached to the lower end of the crankshaft 12, and a flywheel 22 is attached to the upper end of the crankshaft 12. In the figure, 23 is an engine cover, 24 is a recoil starter, and 25 is a camshaft.

The cutter blade 21 is disposed in a space defined by an outer skirt portion 21a and an upper surface portion 21b in the housing 5, and the lower part of the crankshaft 12 is located within an opening 21c of the upper surface portion 21b.
An inner skirt portion 21d is formed on the outside of the housing 5, and a discharge port 21e for discharging cut grass is formed at the rear of the housing 5.

A plurality of mounting seats 31, . . . are bulged from the circumference of the oil pan 14 at intervals in the circumferential direction, and a stud bolt 32 is embedded in each mounting seat 31 so as to project downward.

A plurality of mounting seats 35, . . . are bulged and formed on the upper surface portion 21b in correspondence with the mounting seats 31.

The flange portion 41a is placed from above on the mounting hole 36 of each mounting seat 35, and the body portion 41b of the outer collar 41, which is a first collar made of a heat insulating material, is fitted into the mounting hole 36 of the mounting seat 35. The flange portion 42a is placed against the seat surface from below, and the body portion 42b of the inner collar 42, which is a second collar made of a heat insulating material, is fitted.

Then, attach the lower surface of the mounting seat 31 to the outer collar 41.
The stud bolt 32 is inserted into the inner collar 42 and tightened with the flange nut 43 from below to fix both the mounting seats 31 and 35.

Since this embodiment is constructed as described above, the engine 6 can be attached and detached by loosening and tightening the flange nut 43.

In particular, when assembling the engine 6 to the housing 5, since the stud bolts 32 are installed in advance in each mounting seat 31 of the engine case 13, the positioning of the plurality of mounting seats 31, 35 can be performed via the stud bolts 32. It is easy to perform, and temporary tightening can be omitted and final tightening can be performed, and the work of attaching and detaching the engine 6 can be done easily and quickly.

Further, in the embodiment, the heat insulating collars 41 and 42 are fitted to the mounting seat 35 of the housing 5 to prevent the mounting seat 31, stud bolt 32, and flange nut 43 of the engine case 13 from coming into contact with the housing 5, respectively. Transfer of heat to the housing 5 can be effectively blocked. Furthermore, even if the inner collar 42 falls off during assembly,
Since the inner collar 42 can be fitted along the stud bolt 32, the inner collar 42 can be easily reassembled.

[Effect of the invention] As is clear from the above explanation, according to the invention,
It has the following effects.

Since the engine heat is blocked by the two inner and outer insulation collars, the heat generated in the engine is difficult to transfer to the housing, making it an effective heat countermeasure.

As a result of the above, the durability of the housing is improved.

Even if the lower collar falls off during assembly,
Since the collar can be easily positioned along the stud bolt and the collar can be easily fitted along the mounting hole, reassembly of the lower collar can be easily performed.

Engine removal work can be performed easily and quickly.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the main parts of a walk-behind lawn mower, Figure 2
The figure is a sectional view of the connecting portion between the engine case and the housing. 1 is a walk-behind lawn mower (work machine), 5 is a housing,
6 is the engine, 21 is the cutter blade, 31,
35 is a mounting seat, 32 is a stud bolt, 41 is an outer collar (first collar), 41a and 42a are flange parts, 41b and 42b are body parts, and 42 is an inner collar (second collar).

Claims (1)

[Scope of utility model registration request] In a work machine in which the engine that drives the work member is disposed above the housing of the work machine, and the engine is mounted on the housing by placing the mounting seat of the engine case on the mounting seat of the housing, the body and flange are integrated. forming a first collar made of a heat insulating material, and fitting the body of the first collar into the mounting hole by bringing the flange portion into contact with the seat surface from above the mounting hole of the mounting seat of the housing; Furthermore, a second collar made of a heat insulating material is formed in which a body part and a flange part are integrally formed, and the body part of the second collar is brought into contact with the first collar by abutting the flange part against the seat surface from below the first collar. A bolt, which is configured to fit into the engine case, is fixed to the mounting seat of the engine case, and projects downward from the bolt is inserted into the body of either the first collar or the second collar, and is tightened with a nut. An engine mounting structure for a work machine, characterized in that a mounting seat of an engine case is attached to a mounting seat of a housing by tightening.