JPH0427802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a lawn mower engine mounting device suitable for mounting and fixing an engine, etc. on the casing of a lawn mower.

(b) Conventional technology Conventionally, an engine was mounted on the upper surface of a casing supported by wheels, a drive shaft was suspended from the engine, and a cutting blade was attached to the lower end of the drive shaft so that it could rotate in a horizontal plane. There was a type of lawn mower.

For example, the details are shown in Utility Model Publication No. 59-1466, etc., but the point is that the rotation and stopping of the cutting blade and the starting and stopping of the traveling device can be remotely controlled from the hand of the handle, and the required In addition to making it possible to cut grass at a specific location, the mowing machine itself can be freely selected, whether it is self-propelled or manually pushed.

(c) Problems to be solved by the invention By the way, this type of grass cutter guides the cut grass from a discharge passage provided inside the casing to a discharge port provided at the rear of the machine, and discharges it from there. However, normally a catch bag is connected to this outlet so that the water is collected in the catch bag. Therefore, a fan is rotated together with the cutting blade to generate the discharge wind, but in order to generate sufficient wind, the casing must have a sufficient area at a predetermined location. A wind inlet must be provided.

However, on the other hand, this type of mower is mainly used for mowing lawns in home gardens, etc.
Although it is required to be lightweight and convenient, if the above-mentioned suction ports are sufficient, this requirement will be violated in terms of space and structure.

(d) Means for solving the problems Accordingly, the present invention solves the above-mentioned problems by taking the following measures.

In other words, while the engine is mounted above the casing and the drive shaft is suspended from the engine,
In this mower, in which a cutting blade is fixed to the drive shaft via a clutch mechanism, an opening is provided on the upper surface of the casing, a suction fan is attached to the upper surface of the cutting blade, and the engine is installed around the opening. The opening is connected to the outside by a number of mounting bolts, and the opening is suspended at a certain gap as much as possible, and a plurality of the mounting bolts in this gap are used to move up and down, which is a component of the clutch mechanism. It is characterized in that a coupling plate is fitted into the coupling plate, and the coupling plate serves both as a rotation stopper and as a vertical movement guide structure.

(e) Effect As a result, the top surface of the casing and the bottom surface of the engine will be separated by a certain distance, so if an opening is formed on the top surface of the casing, which is an air intake port,
You can inhale a sufficient amount of air from here, and
Even when installing the engine, it is sufficient to leave it in the same position (a favorable position in terms of weight balance) and float it slightly upwards, and there is no need to shift it to the side.

Furthermore, since this fixed gap in the mounting bolt is simply a space, it can be used to support or guide some member, for example.
It is also possible to provide a structure for preventing rotation and guiding the vertical movement of the coupling plate that constitutes the clutch mechanism of the cutting blade.

(F) Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the main parts of a lawn mower often used for mowing lawns, etc., and FIG. 3 is a sectional plan view of FIG. 1, and FIGS. 4 and 5 are sectional views of FIG. 2.
The sectional view, FIGS. 6 and 7 are a side view and a plan view of this mower.

First, let me explain the overall structure of the mower.
The mower has a disc-shaped casing 3 equipped with front wheels 1, 1 and rear wheels 2, 2, and an engine 4 is mounted on the center of the upper surface of the casing 3.

By the way, this casing 3 is disc-shaped as described above, but it also has a spiral-shaped raised part along its outer peripheral edge, and this part is made hollow. This is used as a discharge passage 5 for the cut grass (grass), and the rear end of this discharge passage 5 is opened to serve as a discharge port 6. In addition, there is a catch button 7 at the rear of the discharge port 6.
is connected so that the grass discharged from the discharge port 6 can be collected therein.

Further, in addition to a handle 8 extending backward from the rear of the casing 3, the handle 8 is equipped with various levers for operation as described later.

Next, we will explain the power transmission structure for the reaping section and the traveling section. First, in the reaping section, the drive shaft 9 directly connected to the engine 4 protrudes perpendicularly into the casing 3. The power of the drive shaft 9 is transmitted via a clutch mechanism 10 to a cutter knife-shaped cutting blade 11 fixed to the lower end thereof.

That is, the drive plate 12 is firmly fitted to the drive shaft 9, and below this, the cutting blade 11
is fixed to a mounting plate 13 which is loosely fitted to the drive shaft 9 together with suction fans (hereinafter referred to as fans) 14 which are also loosely fitted to the drive shaft 9 and an intervening plate 15 . Directly below the drive board 12, a connection board 16 is provided so as to be pressed against the drive board 12 at all times by a spring 17. Note that the mounting board 13 has a pin 18 planted therein, which protrudes into the connecting board 16, so that even if the connecting board 16 moves up and down, the connecting board 16 and the mounting board 13 will not cooperate. It's starting to rotate.

The upward movement of the coupling board 16 by the spring 17 causes the sliding part 19 on the top surface to come into contact with the contact part 21 on the bottom surface of the coupling board 20, which is also installed around the drive shaft 9. The board 20 itself also has a drive shaft 9.
Since it is in contact with the command panel 22 which is loosely fitted into the control board 22 and is prevented from moving upward, it is configured to be impossible at all times.

Note that the coupling plate 20 is configured to be able to move only up and down without rotating relative to the drive shaft 9 due to the rotation prevention and vertical movement guide structure described below.

That is, several guide holes 23 are formed near the outer peripheral edge of the coupling board 20, and these guide holes 2
3 are fitted into mounting bolts 24 for mounting the engine 4 planted on the upper surface of the casing 3 so as to be able to slide up and down. Further, springs 25 are interposed between the coupling plate 20 and the casing 3, and the coupling plate 22 is always elastically biased upward.

By the way, one end of the wire 26 is connected to the command panel 22, and the other end is connected to the mower blade lever 27 provided on the handle 8. Therefore, when the mower blade lever 27 is tilted back and forth, the command panel 22 is rotated at a constant angle with respect to the drive shaft 9. Balls 28 are held at several positions concentrically from the center of the drive shaft 9 near the outer periphery of the command panel 22, and balls 28 are held at positions on the coupling board 20 corresponding to these positions. Since grooves 29 are formed that gradually deepen in the direction, when the command board 22 is rotated, the coupling board 20 floats due to the action of the balls 28 and the grooves 29, and the connection board 16 is accordingly lifted up. After allowing floating, the contact portion 21 of the coupling plate 20 and the sliding portion 19 of the coupling plate 16 are finally separated, and the coupling plate 16 and the drive plate 12 are brought into a pressed state.
The power of the drive shaft 9 is transmitted to the cutting blade 11 and the like.

This is the clutch mechanism 10 described above, but this configuration is such that when the clutch is disengaged (the drive board 12
and when the connecting board 16 is released), as mentioned above,
The contact part 21 on the bottom of the coupling board 20, which moves up and down but does not rotate, is the sliding part 1 on the top of the coupling board 16, which is integrated with the cutting blade 11 etc.
9, so these brake mechanisms are also used together.

The engine 4 is fixed with a fixed gap above the top surface of the casing 3 by the above-mentioned vertical mounting bolts 24. At this time, spacer bolts 30 are installed on the top surface of the casing 3 to secure the engine 4. Attach this spacer bolt 30 to the bottom of the
By placing it on the head of..., this gap can be maintained even more reliably. At this time, since the spacer portion of the spacer bolt 30 exists only as an intervening member, it can also be used for fixed support of the return spring 31 for returning the command panel 22, etc. .

That is, in addition to winding the coil portion of a coil spring-like return spring 31 with one end fixed to the coupling board 20 etc. around the spacer bolt 30, the other end is connected to the pin 32 installed in the command board 22. Stop it.

As a result, when the mower blade lever 27 is not tilted, the command panel 22 always returns to its original position by the action of the return springs 31.

By the way, at this time, if the part of the coupling board 20 through which the pin 32 is inserted is formed into a long hole 33, and the rotation angle of the command board 22 is set so that the pin 32 hits the end of the long hole 33, It becomes a stopper that also serves as a suitable positioning at this time.

Furthermore, if the upper surface of the casing 3, which is the back surface of the engine 4, is opened appropriately, this opening 34 will communicate with the outside, and will serve as a suction port for air suction by the fan 14 described above.

Next, power is transmitted to the traveling part, and this is done as follows.

That is, a pulley 35 is fixed to the drive shaft 9, and a pulley 37 is also fixed to a transmission shaft 36 vertically provided near the rear wheels 2, 2, and both 35, 37 are connected by a belt 38. Link. In addition, since the pulley 37 has its width biased toward the narrow side by the spring 39, the tension pulley 41 installed on the tension arm 40 installed in the middle is aligned with its central axis. 42 to adjust the tension of the belt 38, this becomes a speed changing mechanism. Of course, the swinging of the tension arm 40 can also be controlled remotely by connecting one end of the wire 43 to this and the other end being connected to the gear shift lever 44 provided on the handle 8. .

By the way, the power transmitted to the transmission shaft 36 is
It is transmitted to the rear wheels 2, 2 in the following manner.

The transmission shaft 36 is housed in a gearbox 45, and inside the transmission shaft 36, a worm 46 is formed. The loosely fitted worm foil 48 is engaged.

Next to the worm foil 48 is a spline tube 4.
9 is firmly fitted to the rear axle 47, and a clutch body 50 is fitted to this spline cylinder 49 so as to be freely slidable in the axial direction. Also, worm foil 48
Since engagement pawls 51 and 52 are formed on the facing surfaces of the spline cylinder 49 and the spline cylinder 49, the fork 53 is fitted into the clutch body 50 and the fork 53 is rotated around its fork shaft 54. The power transmitted to the transmission shaft 36 can be switched on and off with respect to the rear wheels 47.

Note that the rotation of the fork 53 is caused by the fork shaft 54.
One end of a wire 56 is connected to an arm 55 fixed to the handle 8, and the other end is connected to a travel lever 57 also mounted on the handle 8.
The vehicle can be switched between traveling and stopping by tilting the vehicle (if the clutch body 50 is removed from the worm wheel 48, the traveling power is cut off and the vehicle can also be operated manually).

Furthermore, a rear axle 47 protruding from the casing 3
A pinion gear 58 is fixedly installed at the end of the rear axle 47 , and an internal gear 59 formed on the inner circumference of the rear wheel 2 meshes with this pinion gear 58 .
The power transmitted to the rear wheels 2, 2 is finally transmitted to the rear wheels 2, 2.

In addition, the central shaft 6 located at the center of the rear wheels 2, 2
0,60 is the casing 3 from which the rear axle 47 protrudes
The arm 6 can rotate around the bosses 61, 61 of
2, 62, this arm 6
By rotating and fixing the wheels 2 and 62 at appropriate positions, it is possible to change the distance between the ground and the bottom of the casing 3, that is, adjust the cutting height. has a similar structure).

As described above, when you want to mow the lawn, by operating the cutting blade lever 27 to the connection side, the cutting blade 11 rotates and cuts the grass, and at the same time the fan 14
The mowed grass is also rotated to guide the cut grass through the discharge passage 5 from the discharge opening 6 to the catch bag 7. At this time, if the travel lever 57 is also operated to the connection side, the power from the drive shaft 9 is also transmitted to the rear axle 47, and the mower moves forward in a self-propelled manner. In addition, if the travel lever 57 is operated to the disconnection side, the power connection between the rear axle 47 and the worm wheel 48 is cut off, so the travel is not only stopped, but also
It is also possible to move forward and backward by manually pushing the engine 4 in such a configuration as described above. The opening 34 is connected to the outside by the mounting bolts 24, so that the opening 34 is in communication with the outside, and the mower is mounted with a fixed gap between the mounting bolts 24, and the clutch mechanism 10 for the cutting blade 11 is formed in this fixed gap between the mounting bolts 24. It is characterized by having a structure that prevents the coupling plate 20 from rotating and also guides its vertical movement.

(g) Effects of the invention Based on the above, this invention can be expected to have the following effects.

First, the engine 4, which is heavy in terms of weight, is fixed in the center position of the casing 3 using the mounting bolts 24, that is, without being moved to the side.
Since it is mounted with a fixed gap above it, it is possible to secure an opening 34 which is an air intake port with a sufficient volume on the upper surface of the casing 3, and also to achieve a favorable balance arrangement in terms of weight. The presence of the engine 4 also serves as a cover for the opening 34 that serves as the intake port.

Furthermore, using the portion of the mounting bolts 24 that exists in this gap, the above-mentioned coupling plate 20 is attached to this portion.
Since it is also possible to incorporate a rotation stopper and vertical movement guide structure, the component structure can be shared and simplified, making it possible to effectively utilize space and reduce costs.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
Fig. 1 is a vertical sectional view of the main parts of the mower, Fig. 2 is a partially sectional plan view, Fig. 3 is a cross-sectional view of Fig. 1, and Figs. 4 and 5 are - of Fig. 2. 6 and 7 are a side view and a plan view of the mower. Symbol, 3...Casing, 11...Cutter blade, 4...Engine, 20...Coupling board, 9...Drive shaft, 24...Mounting bolt, 10...Clutch mechanism.

Claims (1)

[Claims] 1 Mount the engine 4 above the casing 3,
While the drive shaft 9 is suspended from this engine 4,
The cutting blade 1 is connected to this drive shaft 9 via a clutch mechanism 10.
In the mower to which the casing 3 is fixed,
In addition to providing an opening 34 on the upper surface and attaching the suction fan 14 to the upper surface of the cutting blade 11, the engine 4 is attached to the opening 34 by several mounting bolts 24 installed around the opening 34. At the same time, a plurality of the mounting bolts 24 in this gap are fitted with a vertically movable coupling plate 20, which is a component of the clutch mechanism 10, and this coupling plate A lawn mower engine mounting device characterized by having both a rotation stopper and a vertical movement guide structure.