JPH0441799Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a direct-coupled grass mower in which the cutting blade is directly mounted on the crankshaft of an engine mounted on the machine body. Regarding the improved structure.

(b) Conventional technology In direct-coupled mowers, the cutting blades are mounted directly on the crankshaft of the installed engine as described above, so there is a risk that the cutting blades may collide with obstacles during mowing operations. The excessive impact load caused by the collision is transmitted not only to the cutting blade but also to the engine crankshaft, resulting in a serious accident in which the entire crankshaft bends or the wedge joint is damaged. If this happens, the entire engine, including the engine, must be disassembled and repaired, which requires a great deal of effort, and the replacement parts required for repair are also expensive, which is disadvantageous in terms of cost.

For this reason, in the past, especially in direct-coupled lawn mowers, the cutting blade device has been equipped with a mechanism that causes shearing or slipping when subjected to an impact load exceeding a predetermined value, a buffer member that absorbs and alleviates the impact load, etc., on the crankshaft. This is done to prevent excessive load from being transmitted to the crankshaft due to the action of these mechanisms.

(c) Problems to be solved by the invention However, all of the conventional structures that incorporate the above-mentioned mechanisms or members into the cutting blade mounting part respond sensitively to impact loads and further improve the overload transmission prevention function. If it were possible to do so, it would be necessary to replace the shear material or return components such as the cutting blade to their normal positions each time the shear material is sheared or the position of components such as the cutting blade becomes misaligned. On the other hand, if we try to avoid the above-mentioned troubles, the function to prevent overload transmission to the crankshaft side will deteriorate, resulting in a lack of safety. Balancing the two is extremely difficult,
In reality, safety is more important, and the above-mentioned restoration of the original condition must be performed frequently.

Therefore, the present invention eliminates the need for replacing and repairing the shear material or returning misplaced parts to their proper positions, yet prevents overload transmission to the engine crankshaft side with higher safety. It is being implemented with the aim of achieving the following.

(d) Means for solving the problems In order to achieve the above purpose, the present invention takes the following technical measures.

In other words, the mounting legs on the engine side are arranged on an approximate circumference centered on the crankshaft, and each mounting leg is fastened to the support section on the aircraft side with a shock absorber made of rubber interposed. In an engine-mounted device that is designed to be mounted on an engine, the upper and lower bodies, in which upward and downward bolts are planted on the upper and lower surfaces of the rubber that forms the shock absorber, are integrated by baking, etc., and the bolts are attached to the mounting legs and supporting parts. The bolt is inserted into the bolt insertion hole formed in the bolt, and is fastened with a nut that is screwed onto the bolt.
A stopper that contacts the upper body is formed at the front part of the lower body in the direction of rotation of the crankshaft, and left and right stoppers are formed that contact the left and right end surfaces of the upper body, so that the shock absorber can be moved in the direction of rotation of the crankshaft. It is designed to move only in the opposite direction and in the up and down direction.

(E) Effect In this invention, the engine is mounted on the aircraft via the shock absorbing device with the above-mentioned characteristic structure and arrangement, so the mower blade, which is directly attached to the crankshaft, collides with obstacles during operation. If something like this happens, the shock absorber works by retracting the entire engine in the direction opposite to the direction of rotation of the crankshaft (direction of rotation of the cutting blade), mitigating the impact force, and further preventing the cutting blade from becoming obstructed. Even if the engine were to run over something, the shock absorber moves up and down in response, completely avoiding damage to the engine crankshaft and other parts. Therefore, according to the present invention, it is no longer necessary to incorporate an overload prevention mechanism such as a shear structure into the part where the cutting blade is attached to the crankshaft, so the trouble of frequently replacing and repairing the shear material etc. is eliminated. The safety of the device is improved.

(F) Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

The entire lawn mower in which the present invention is implemented is shown in FIGS. 5 and 6, and is formed using a casing 1 as the main material, and wheels 2 are disposed on the front, rear, left, and right sides. The casing 1 is configured by extending a handle 3 and is a fuselage forming member.
The engine 6 is mounted by fixing the mounting legs 5 to the support parts 4 installed on the upper part, and the crankshaft 7 of the engine 6 is suspended in the casing 1 and wedged to the hanging tip. A cutting blade 9 is attached through a boss body 8 that rotates in the casing, and the grass cut by the cutting blade 9 rotating inside the casing is passed through a duct 10 to a catcher 11.
It is structured so that the grass is collected in the same way.

Therefore, the present invention provides a mounting leg 5 for the engine 6.
. . . is implemented in the portion that is fixed to the support portion 4 . . . Specific examples of the structure are shown in FIGS.

The support parts 4 formed on the body, that is, the casing 1 side, are arranged at 12 equally divided positions on an approximate circumference centered on the crankshaft 7, and each has a bolt insertion hole in the vertical direction. Further, the mounting legs 5 on the engine 6 side are provided to correspond to the above-mentioned supporting parts 4, and each has a vertical bolt insertion hole.

Then, the engine 6 is mounted on the aircraft by aligning each mounting leg 5 with the support part 4 and fastening them together using fastening means such as bolts and nuts. Between 5... and support part 4...,
The following shock absorber S... is interposed.

As shown in FIGS. 3 and 4, each shock absorber S includes an upper body 14 in which a bolt 13 passing through the bolt insertion hole of the mounting leg 5 is installed upward, and a supporting body 14. A bolt 15 passing through a bolt insertion hole of the portion 4 is connected to a lower body 16 which is planted downward with a cushioning material such as rubber 17 which is integrated by baking or the like. A stopper 18 that comes into contact with the end surface of the upper body 14 is erected at a portion of the lower body 16 that is forward in the direction of rotation of the crankshaft 7 (direction of rotation of the cutting blade). Left and right stoppers 19, 19 that abut the left and right end surfaces of the body 14 are arranged in series.

In other words, the upper body 14 and the lower body 1 of the shock absorber S
6 and 6 can move separately due to the action of impact materials such as rubber 17, but the movement of the crankshaft 7 in the rotational direction A and in the left-right direction is regulated to a non-moving state by stoppers 18, 19, 19, A
It is configured so that it can separately move only in the opposite direction B and the vertical direction C.

In the present invention, when the engine 6 is mounted on the aircraft, the upper and lower bottles 13, 15 of the shock absorber S
are inserted into the bolt insertion holes of the mounting leg portion 5 and the support portion 4, respectively, and the nuts 20, 20 are screwed together and tightened, so that the engine 6 with the shock absorber S interposed
is installed on the aircraft.

When starting work, the engine 6 is operated to start, but since each shock absorber S has a structure in which movement in the direction of rotation of the crankshaft is prevented by the stopper 18, there is no problem with the start operation. During subsequent work, when the cutting blade 9 collides with an obstacle and an abnormal load is applied, the shock absorber S moves in the direction B opposite to the direction of rotation of the crankshaft, retracting the entire engine 6. This prevents damage to various parts due to overload. Also, if the cutting blade 9 runs over an obstacle, the shock absorbers S move in the vertical direction C to cushion it. This prevents damage to various parts due to running over. Furthermore, the shock absorbers S not only prevent damage caused by overload, but also provide vibration isolation during normal operations.

(g) Effects of the invention As explained above, the present invention arranges the mounting legs 5 on the engine 6 side on an approximate circumference centered on the crankshaft 7, and each mounting leg 5 is attached to the rubber 17. In an engine mounting device in which a shock absorber S formed by... is interposed and fastened to a supporting portion 4 on the aircraft body side, a rubber 1 forming the shock absorber S is used.
The upper body 14 and the lower body 16, in which upward and downward bolts 13 and 15 are implanted on the upper and lower surfaces of 7, are integrated by baking or the like, and the bolts 13 and 15 are formed on the mounting legs 5... and the support parts 4... A stopper 18 is formed at the front of the lower body 16 in the direction of rotation of the crankshaft 7 by inserting it into the bolt insertion hole and tightening it with a nut 20 that is screwed onto the bolts 13 and 15. At the same time, left and right stoppers 19, 19 are formed that come into contact with the left and right end surfaces of the upper body 14, so that the shock absorber S... can only move in the direction B opposite to the rotational direction of the crankshaft 7 and in the up and down direction C. , a cutting blade 9 mounted directly on the crankshaft 7
If the unit collides with an obstacle or runs over an obstacle, the shock absorber S moves in the direction B opposite to the direction of rotation of the crankshaft or in the vertical direction C to absorb and alleviate the overload caused by the collision, thereby preventing damage to various parts. Therefore, it is no longer necessary to incorporate a mechanism such as a shear structure into the cutting blade attachment part of the crankshaft, which requires replacing and repairing the shear material every time shearing occurs, so the troublesome repair work is eliminated. However, there is an advantage that safety against overload is further improved. Furthermore, since the shock absorber S is movable only in the direction opposite to the direction of rotation of the crankshaft and in the vertical direction, it cannot be moved in the direction of rotation of the crankshaft or in the left-right direction. As the engine moves in the direction of rotation of the crankshaft or in the left and right directions, the engine can be started accurately without any problems. It also has the advantage of preventing the engine from moving while attenuating vibrations, thereby preventing problems caused by vibrations.

Further, since the bolt does not penetrate through the rubber 17, the amount of elastic deformation of the rubber 17 increases, and the movement in the movable direction is performed smoothly.
Since it is surrounded and protected by the lower body 16 and the left and right stoppers 19, 19, it can be used for a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view showing the structure of the main part, FIG. 2 is a schematic plan view of the main part, and FIG. FIG. 4 is a perspective view of a shock absorber according to the present invention, FIG. 5 is an overall plan view of a lawn mower embodying the present invention, and FIG. 6 is a side view thereof. 4... Support part, 5... Mounting leg part, 6... Engine, 7... Crankshaft, S... Shock absorber.

Claims (1)

[Scope of utility model registration request] The mounting legs 5 on the engine 6 side are arranged on an approximate circumference centered on the crankshaft 7, and each mounting leg 5...
In an engine mounting device in which a shock absorber S formed of rubber 17 is interposed and fastened to a support portion 4 on the aircraft body side, the shock absorber S
The upper body 14 and the lower body 16, in which upward and downward bolts 13 and 15 are implanted on the upper and lower surfaces of the rubber 17 forming the
are inserted into the bolt insertion holes formed in the mounting legs 5... and the support parts 4... and fastened with nuts 20 screwed onto the bolts 13 and 15, so that the lower body 16 is located at the front in the rotational direction of the crankshaft 7. The part includes an upper body 14
A left and right stopper 1 is formed that comes into contact with the left and right end surfaces of the upper body 14.
9, 19, and the shock absorbers S are movable only in the direction B opposite to the rotational direction of the crankshaft 7 and in the vertical direction C.