JPH0549245B2 - - Google Patents

Description

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

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 mow 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, the grass mower of this structure guides the cut grass from the discharge passage provided inside the casing to the discharge port provided at the rear of the machine, and discharges it from there. Normally, a catch bag is connected to this discharge port, and the liquid 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 often used for mowing lawns in home gardens, etc., so it is required to be lightweight and convenient. , which violates this requirement 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, the engine is mounted on the top of the casing, and the drive shaft is suspended from the engine, while
In a lawn mower in which a cutting blade is fixed to the drive shaft via a clutch mechanism, the engine is connected to the opening formed in the upper surface of the casing by several mounting bolts installed around the opening. At the same time, several spacer bolts are similarly protruded from around the opening on the upper surface of the casing, and the engine is supported by these spacer bolts. It is characterized in that it also serves as a support member for a return spring of a command panel constituting the clutch mechanism.

(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 as 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 several spacer bolts with a predetermined length are interposed between this fixed gap,
This can also be used for fixing some member, for example, as a support member for a return spring of a command panel constituting a clutch mechanism.

(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 mainly used for mowing lawns, etc., and FIG. A cross-sectional plan view, Figure 3 is a cross-sectional view of Figure 1, and Figure 4 is a
5 and 5 are sectional views taken from FIG. 2, and FIGS. 6 and 7 are a side view and a plan view of the 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. The cut grass is used as a discharge passage 5, and the rear end of the 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.

In addition, a handle 8 is extended backward from the rear of the casing 3, and 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 a fan 14 and an intervening plate 15 which are also loosely fitted to the drive shaft 9. And drive board 1
Directly below the driving plate 2, a connecting plate 16 is provided so as to be pressed against the drive plate 12 at all times by means of a spring 17. Note that a pin 18 is installed in the mounting board 13 and protrudes into the connection board 16, so even if the connection board 16 moves up and down, the connection board 16
The mounting plate 13 and the mounting plate 13 are designed to constantly rotate together.

The upward movement of the coupling plate 16 by the spring 17 is such that the sliding portion 19 on the top surface thereof comes into contact with the contact portion 21 on the bottom surface of the coupling plate 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. The coupling plate 20 has several guide holes 23 formed near the outer peripheral end, and these guide holes 23 are connected to the mounting bolts 24 for mounting the engine 4 planted on the top surface of the casing 3. In addition to being guided and supported by the casing 3, a spring 25 is interposed between it and the counter casing 3, so it is movable up and down, and is always pushed upward, so that it can be pressed against the command panel 22. has been done.

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 the 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
(when the connecting board 16 is released), its own guide hole 23 is fitted into several mounting bolts 24 raised upward from the casing 3, and although it may move up and down, it cannot rotate. Since the contact portion 21 on the bottom surface of the connecting board 20, which is not connected to the cutting blade 11, is in elastic contact with the sliding portion 19 on the top surface of the connecting board 16, which is integrated with the cutting blade 11, etc., these brake mechanisms are also used. This means that

On the other hand, the engine 4 has the above-mentioned mounting bolt 2.
The engine 4 is fixed at a certain distance from the upper surface of the casing 3 by the upper surface of the casing 3. At this time, a spacer bolt 30 is installed on the upper surface of the casing 3, and the bottom surface of the engine 4 is attached to the head of the spacer bolt 30. By placing it on top, this gap can be maintained even more reliably. And at this time,
Since the spacer portions of the spacer bolts 30 merely exist as intervening members, they can also be used for fixed support of the return springs 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, the part of the coupling board 20 through which the pin 32 is inserted is formed into a long hole 33, so that the command board 22 when connecting the power from the drive shaft 9
If the rotation angle is set so that the pin 32 hits the end of the elongated hole 33, it becomes a suitable stopper 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 width of the pulley 37 is 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 the center axis of the pulley 37. 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 since one end of the wire 43 is connected to this and the other end is connected to a speed change 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 axle 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 1
1 rotates to mow the grass, and at the same time, the fan 14 also rotates to guide the cut grass through the discharge passage 5 from the discharge port 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 transferred to the rear axle via the worm wheel 48 and the clutch body 50.
7, and the mower moves forward on its own. 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 pushing it by hand.

By the way, as described above, in this configuration, the engine 4 is fixed to the opening 34 formed in the upper surface of the casing 3 by several mounting bolts 24 installed around the opening 34. At the same time, several spacer bolts 30 are similarly protruded from around the opening 34 on the upper surface of the casing 3, and these spacer bolts 30 also allow the engine to be connected to the engine. 4, the spacer bolts 30 are also used as support members for the return springs 31 of the command panel 22 constituting the clutch mechanism 10.

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

First, the spacer bolt 30... itself is the engine 4.
The support member for supporting the spring 31 from below, the spacer member for floating it at a certain distance, and the support member for the return spring 31... will be used for the same purpose, which will result in the mutual use of the parts and the effective use of space. Become. In addition, since the parts are used in common, there is no need for separate parts, and the number of parts can be reduced.

Furthermore, the engine 4 is fixed above the casing 3 by mounting bolts 24 with a fixed gap, and is also supported from below by several spacer bolts 30. Therefore, the engine 4 can be firmly fixed and supported, and the surface pressure on the mounting portion (seat) can be reduced.

[Brief explanation of the drawing]

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. (Sign), 3...Casing, 4...Engine,
9... Drive shaft, 10... Clutch mechanism, 11...
Mowing blade, 22...Command panel, 24...Mounting bolt,
30... Spacer bolt, 31... Return spring.

Claims (1)

[Claims] 1 Mount the engine 4 on the top of 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 lawn mower to which the engine 1 is fixed, the engine 4
, the opening 3 formed on the upper surface of the casing 3
Several mounting bolts 24 planted around 4...
The opening 34 is mounted with a constant gap as much as possible so that it is in communication with the outside, and several spacer bolts 30 are similarly protruded from around the opening 34 on the upper surface of the casing 3, and the spacer bolts 30 are mounted. According to the engine 4
In addition to supporting the spacer bolts 30, the engine support device for a lawn mower is characterized in that the spacer bolts 30 are also used as support members for the return springs 31 of the command panel 22 constituting the clutch mechanism 10.