JPH0361417A - Self-propelled lawn mower - Google Patents

Abstract

PURPOSE:To provide the title mower so designed that the frame in a propelling section is ensured to entirely cover a lawn mowing part to enable the lawn mowing part equipped with e.g. an engine to be suitably protected from obstacles. CONSTITUTION:A lawn mowing part 5 is fitted with an engine 2 and a mower cutter 3 to be put to rotary driving by said engine 2, whereas a propelling section 8 is equipped with driving wheels 7. And the frame 9 in the propelling part 8 is ensured to entirely cover the lawn mowing part 5. As a result, the objective self-propelled lawn mower can be realized, which, in particular, can suitably protect the lawn mowing part from obstacles during running.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a self-blade traveling lawn mower that can be self-blade driven by remote control or the like.

(Prior art) Conventional lawn mowers have an engine mounted on the mower case, and this engine rotates the cutter inside the mower case.
The most common type of mower is one in which the mower case is manually pushed and moved to mow the lawn.

(Problems to be solved by the invention) With such conventional lawn mowers, a large amount of human power is required when mowing grass grown on a large area such as a golf course.Also, lawn mowing work under the scorching summer sun requires a large amount of human power. This results in extremely heavy labor for the workers.

This invention was made in consideration of the above circumstances,
It is an object of the present invention to provide a self-blade traveling lawn mower that can run with its own blade and can suitably protect a mowing section having an engine etc. from obstacles.

(Structure of the Invention) (Means for Solving Problem
and a running section provided with wheels, and the frame of the running section is configured to cover the entire mowing section.

(Function) Therefore, according to the self-blade traveling lawn mower according to the present invention,
Since the lawn mower has a running section equipped with drive wheels, by remotely controlling this running section, the lawn mower can run using its own blade.

Furthermore, since the lawn mowing section is entirely covered by the frame of the running section, the lawn mowing section can be suitably protected from obstacles, especially while the lawn mower is running.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing an embodiment of a self-blade traveling lawn mower according to the present invention, and FIGS. 2, 3, and 4 are II of FIG.
They are sectional views taken along the -II line, the ■-■ line, and the TV-TV line, respectively.

As shown in FIGS. 1 to 4, an engine 2 is mounted on a mower case 1, and a mower cutter 3 (see FIG. 2) for cutting grass is disposed inside the mower case 1. The mower case 1, the engine 2, the mower cutter 3, and the crankshaft 4 constitute a lawn mower 5.

This lawn mowing section 5 is supported by running sections 8 each having a pair of front wheels 6 and a rear wheel 7 as a driving wheel. The running section 8 includes, in addition to the front wheels 6 and the rear wheels 7, a running section frame 9, a steering device 10, a running section W111, a suspension device 12 for suspending the lawn mower 5, and the like.

The running section frame 9 is a main frame 1 having a substantially U-shaped cross section and a cross-sectional shape in plan view as shown in FIG.
3, and a sub-frame 14 which is curved upward from the central position in the longitudinal direction of the main frame 13 (see FIGS. 3 and 4).The sub-frame 14 consists of a pair of Subframe vibe 15 is bridge 16
A subframe plate 17 is fixed to the top of the subframe vibe 15 and the bridge 16. Note that the reference number 17A in FIGS. 1 and 2 indicates a bumper that protects the front wheel 6.

The aforementioned suspension device 12 is constructed with a suspension bolt 18 and a suspension nut 19, as shown in particular in FIGS. 2 and 7. The suspension bolt 18 is attached to the engine 2 of the lawn mower 5.
It is welded to the top of the board and is placed vertically upward. This suspension bolt 18 is screwed through both the subframe plate 17 and the bearing pedestal 20 fixed to the subframe plate 17. This suspension bolt 1
A suspension nut 19 is screwed into the tip portion of 8. A bearing 21 is interposed between these suspension nuts 19 and a bearing pedestal 20. Therefore, the load on the lawn mower 5 is:
It is transmitted from the suspension bolt 18 to the suspension nut 19, and further transmitted to the subframe 14 via the bearing 21, and is supported by this subframe 14.

A lock nut 22 is screwed onto the suspension bolt 18 below the subframe play 1-17.

Also,! ! ! ! A handle 23 is fitably provided at the tip of the frame nut 19. To lower the mower 5, first loosen the lock nut 22, then rotate the handle 23 in the direction of the arrow claw, and finally tighten the lock nut 22 toward the subframe plate 17.

Raising of the lawn mower 5 is also carried out in the same manner. The height of the lawn mower 5 is adjusted by rotating the suspension nut 19 and the like. The two-dot chain line 123A in FIG. 2 indicates the lowermost position of the lower end of the mower case 1, and the position of the mower case 1 in the figure indicates the highest position of the mower case 1.

On the other hand, as shown in FIGS. 1, 2, and 4, a vibration prevention device 24 is installed between the front wheel 6 side of the main frame 13 and the mower case 1. In other words, mainframe 1
Two pairs of upper and lower main frame side brackets 25 are installed on the front wheel 6 side of the vehicle. A size indicating holder 26 is vertically provided below the main frame side bracket 25 as shown in FIGS. 2 and 4. As shown in FIGS. Further, a mower case side bracket 27 is fixed to the front wheel 6 side of the mower case 1, and a bar 28 is hung upward from this mower case side bracket 27. By inserting this bar 28 into the holder 26, the mowing section 5 is prevented from swinging in the horizontal direction with respect to the running section 8. Moreover, the bar 28 is provided so as to be slidable in the vertical direction within the holder 26, so that it does not become a hindrance when adjusting the height of the lawn mower 5.

Next, the steering device 10 will be explained.

As shown in FIGS. 1 to 4, a front wheel steering bracket 29 and a rear wheel steering bracket 30 are fixed to both corner portions on the front wheel 6 side and both corner portions on the rear wheel 7 side of the main frame 13, respectively. Ru.

As particularly shown in FIG. 3, the rear wheel side steering bracket 30 includes a plate 31 fixed to the lower surface of the main frame 13 and another plate 32 horizontally attached from approximately the vertical center of the main frame 13. A cylindrical steering boss 33 is fixed to both plates 31 and 32. As shown in FIG. 4, the front wheel steering bracket 29 also has two plates 34, similar to the rear wheel steering bracket 30.
, 35, and a steering boss 36 are fixed to each other.

As shown in FIG. 3, the rear wheel steering shaft 37 is vertically disposed within the steering boss 33 of the rear wheel steering bracket 30 via a bearing, and is horizontally rotatable. A rear wheel steering knuckle 38 also shown in FIG. 6 is fixed to the lower end of this rear wheel steering shaft 37, and the rear wheel 7 is disposed on this rear wheel steering knuckle 38. Further, a rear wheel steering sprocket 39 is spline-coupled to the upper part of the rear wheel steering shaft 37. A bolt 40 is threaded onto one rear wheel steering shaft 37 to prevent the rear wheel steel steering sprocket 39 from being removed. As shown in FIG. 3, a steering sector gear 41 is spline-coupled to the other rear wheel side steering shaft 37 above the rear wheel steel steering sprocket 39. As shown in FIG.

The bolt 40 is inserted from above this steering sector gear 41.
are fitted to prevent the rear wheel side steering sprocket 39 and steering sector gear 41 from being removed, and rotate them together.

Next, the front steering shaft 42 is vertically disposed within the steering boss 36 of the front wheel steering bracket 29 via a bearing, as shown in FIG.
It is provided so that it can be rotated horizontally.

At the lower end of this front wheel side steering shaft 42, a second
A front wheel steering knuckle 43 as shown in the figure is welded. The front wheel 6 is rotatably supported by the front steering knuckle 43 in a vertical direction. Further, a front wheel steering sprocket 44 is spline-coupled to the upper part of the front wheel steering shaft 42, and a bolt 40 prevents the front wheel steering sprocket 44 from being removed.

The above-mentioned rear wheel steering sprocket 39 and front wheel steering sprocket! -44, a steering chain 45 is wound 11 times as shown in FIG.

These steering sprockets 39, 44 and the steering chain 44 constitute a transmission mechanism. The steering chain 45 is also wound around a length roller 46 in the vicinity of both rear wheel side steering sprockets 39. As shown in FIGS. 2 and 3, this length roller 46 is horizontally rotatably disposed on plates 47 fixed to both upper and lower surfaces of the main frame 13 via a roller shaft.

The steering chain 45 is arranged inside the main frame 13 by this length a-ra 46.

Further, as shown in FIG. 1, a steering motor 49 is attached to the main frame 13 near the steering sector gear 41. The steering motor 49 is a reversible motor, and is fixed to a mounting plate 50 fixed to the main frame 13, as shown in FIGS. 2 and 3. When the motor gear 51 of the steering motor 49 meshes with the steering sector gear 41, one rear wheel side steering shaft 37 rotates in the horizontal direction. This rear wheel side steering shaft 37
The rotation is transmitted from the rear wheel side steering sprocket 39 near the steering sector gear 41 to the other rear wheel side steering sprocket 39 and the front wheel steel steering sprocket 44 via the steering chain 45,
Front wheels 6 and rear wheels 7 are synchronously steered.

At this time, when the rear wheel steering sprocket 39 near the steering sector gear 41 rotates in the direction of arrow B in FIG. rotates horizontally in the opposite direction to arrow B, as shown by arrow C. In this way, the front wheels (3j5 and rear wheels 7) are horizontally rotated in opposite directions and are steered, thereby improving the turning performance of the lawnmower.

The steering system M10 is configured as described above.

Now, the above-mentioned traveling device d11 will be explained below.

As shown in FIG. 2, a breadboard vibe 52 is fixed to the rear wheel 711N of the main frame 13 in a vertically downward direction. A bumper 53 shown in FIG. 5 is disposed horizontally at the bottom of this pamba vipe 52 and fixed with bolts.

Further, a shaft holder 54 is fixed to the bread bar vibe 52, and a drive shaft 55 is rotatably held by the shaft holder 54.

As shown in FIG.
It is rotatably supported by a shaft support arm 56 fixed to the inside of the rear wheel side steering knuckle 38. A drive gear 57 is attached to the tip of this drive shaft 55. Further, a universal joint 55A is provided on the drive shaft 55 at a position vertically below the rear wheel side steering shaft 37. This universal joint 55A allows the rotational driving force of the drive shaft 55 to be smoothly transmitted to the drive gear 57 even when the rear wheels 7 are being steered.

On the other hand, the rear wheel 7 is rotatably supported by a rear wheel shaft 58 that passes through the rear wheel steering knuckle 38 and the shaft support arm 56 and is fixed thereto. A driven gear 59 is fixed to the rear wheel 7, and the driven gear 59 meshes with the drive gear 57. therefore,
The rotation of the drive shaft 55 drives the rear wheels 7 to rotate around the rear wheel shaft 58. The friction transmission mechanism 60 that transmits rotational force to the drive shaft 55 will be described next.

As shown in FIG. 1, FIG. 2, and FIG. roller mounting plate 6 fixed to
Supported by 4. Further, the C roller 63 is attached to a gear case 65 to which the drive shaft 55 is connected. Here, the A roller is a driving roller, and the C roller is a driven roller.

First, as shown in FIG. 8, the A roller 61 is rotatably supported by a roller shaft 66 welded to a roller mounting plate 64 together with a driven pulley 67. Further, the A roller 61 has a cylindrical shape with a bottom, and the bottom portion and the driven pulley 67 are fixed to be rotatable together with a bolt 61A or the like. Further, a material having a large friction coefficient, such as rubber 61B, is attached to the side circumference of the A roller 61.

The driven pulley 67 is connected to a drive pulley 69 shown in FIG. 2 via a V-belt 68.

This drive pulley 69 is fixed to the crankshaft 4 and rotated by the engine 2. Therefore, due to the operation of the engine 2, the drive pulley 69 and the V-belt 6
8 and the driven pulley 67, the roller 61 rotates. In addition, the reference numeral 68A in FIG. 1 is a tension boob, which applies appropriate tension to the V-belt 68.

Then, as shown in FIG.
Attached via. In other words, the roller shaft 71
passes through the elongated hole 70, and the B roller 62 is rotatably supported on this roller shaft 71. roller shirt 1~7
1 is positioned and fixed at an arbitrary position by tightening a nut 72.

Further, the B roller 62 has a cylindrical shape with a bottom like the A roller 61, and a knurling 62A is machined on the side circumference thereof.

A B roller positioning bolt 73 is installed at the tip of the roller mounting plate 64. This B roller positioning bolt 73 is operated after loosening the nut 72 of the roller shaft 71 to move the roller shaft 71 in the longitudinal direction of the roller mounting plate 64 and reduce the contact pressure between the B roller 62 and the A roller 61. It is something to be adjusted. After tightening the nut 72 of the roller shaft 71 during this adjustment,
- Loosen the B roller positioning bolt 73 so that the tip of the B roller positioning bolt 73 does not come into contact with the B roller 62. In this way, the B roller 62 that has come into contact with the roller 61 rotates in the opposite direction of the A roller 61 and has the same rotational force as the A roller 61.

Finally, the C roller 63 is also formed into a cylindrical shape with a bottom, and a material having a large friction coefficient such as rubber is attached to the side circumference of the C roller 63. C
The axial length of the roller 63 is set to such a length that the C roller 63 remains in contact with the A roller 61 or the B roller 62 even when the mower case 1 is moved up and down. The C roller 63 is configured to selectively contact or not contact the roller 61 and the B roller 62 when the gear case 65 swings around the drive shaft 55 in the direction of the arrow in FIGS. 8 and 1. be done.

In other words, the C roller 63 is swung backward and the B roller 62
By contacting the B roller 62, the rotational force of the B roller 62 is transmitted to the C roller 63, which is transmitted to the drive shaft 55 via various gears in the gear case 65, and then to the rear wheel 7 via the drive gear 57 and the driven gear 59. Rotate forward and move the lawn mower forward.

Further, as the C roller 63 is swung forward and comes into contact with the roller 61, the rotational force of the A roller 61 is applied to the rear wheel 7 via the C roller 63, the drive shaft 55, etc.
and move the lawn mower backwards.

The swing mechanism 74 for swinging the C roller 63, that is, the gear case 65, will be described next.

The swinging mechanism 74 has a swinging motor 75 as shown in FIGS. 5, 3, and 9. The swing motor 75 is a reversible motor, and the swing motor mounting plate 7
7, it is fixed to the damper 53. Then, the motor gear 78 of the swing motor 75 is engaged with the sector gear 79 loosely fitted to the drive shaft 55.

On the other hand, a gear case fixing plate 80 is attached to the gear case 65.
is fixed. This gear case fixing plate 80 also includes
The drive shaft 55 is inserted in a loosely fitted state. Then, the sector gear 7 is attached to this gear case fixing plate 80.
9 is fixed with bolts or the like. Therefore, when the swing motor 75 operates and the motor gear 78 rotates, the sector gear 79 and the gear case fixing plate 80 swing together around the drive shaft 55, and as a result, the gear case 65 swings in the direction indicated by the arrow. . As a result, the C roller 63 selectively contacts or does not contact the A roller 61 or the 80-roller 62.

The traveling device 11 is configured as described above.

The above-mentioned swing motor 75 and the above-mentioned steering motor 49 are electrically connected to a controller (not shown) installed in the traveling section 8. This controller receives signals from a transmitter (not shown) carried by the operator and controls the operation of the swing motor 75 and the steering motor 49.

For example, to move the lawnmower forward, the swing motor 75 is rotated forward to bring the C roller 63 into contact with the B roller 62. Also,
To turn the lawn mower to the left, use steering motor 4.
9 in the normal direction, the rear wheel side steering sprocket 39 is rotated in the direction of arrow B, and the nodal wheel side steering sprocket 44 is rotated in the direction of arrow C.

According to the above embodiment, mowing the lawn with the mower cutter 3! 55
A rear wheel 7 as a driving wheel is attached to the rear wheel 7.
is driven by the traveling device 11, and the steering device 1
Since the traveling device 11 and the steering device 10 are controlled by the controller, it is possible to realize a lawn mower that can run with its own blades, and
The running and steering of this lawnmower can also be controlled remotely.

Further, since the main frame 13 of the running section 8 surrounds the entire mower case 1 of the lawn mowing section 5, the subframe 14 surrounds the engine 2 of the lawn mowing section 5, and the bumper 17a covers the front wheel 6, Particularly, while the lawnmower is running, the entire lawn mowing section 5 is protected from obstacles by the main frame 13 and the subframe 14, and 9. The front wheel 6 is also protected from obstacles by the bumper 17A.

Furthermore, the lawn mowing section 5 is vertically suspended on the subframe 14 of the traveling section 8 by a suspension system W12, and this suspension system 1
2 is configured so that the height of the lawn mower 5 relative to the running part 8 can be adjusted by the suspension boss 18d3 and the suspension nut 19, so by rotating the suspension nut 19, the height of the mower cutter 3 can be easily adjusted. You can do it here.

FIG. 10 shows a section 'F1.' showing another embodiment of the self-blade mower according to the present invention. It is a front view. In this other embodiment, the same parts as those in the previous embodiment are designated by the same n8, and the explanation thereof will be omitted.

The traveling gear ff181 of this other embodiment is not provided with the swing mechanism 74 of the previous embodiment, but is configured as follows. In other words, the O-row 83 and P
A roller 84 is rotatably supported, and the P roller 84 is provided in constant contact with the C roller 63. Also, O
The roller 83 is configured to be able to rotate integrally with the driven pulley 67, and functions as a driving roller. Also, the 0 roller 83
A sector gear 85 is loosely fitted onto the shaft, and a switching roller 87 is disposed on an arm portion 86 of this sector gear 85. This switching roller 87 is in constant contact with the 0 roller 83, and the swinging of the arm portion 86 in the direction of arrow E allows the switching roller 87 to
3 or p+1-ra 84 selectively in contact or non-contact.

On the other hand, an oscillating motor 88 (reversible motor) is modified on the roller mounting plate 82 or the mower case 1, and the motor gear 80 of this oscillating motor 88 is connected to the sector gear 85.
is engaged with. Therefore, the operation of the running gear 81 is as follows:
First, the driving force of engine 2 is the drive boo...69,■
While the O roller 83 and switching roller 87 are being rotated via the belt 68 and driven pulley 67, the motor gear 89 is operated. , IJ, the motor gear 89 rotates the sector gear 85, so the switching roller 87 swings in the direction of arrow E and selectively contacts the C roller 63 or the P roller 84.

When the switching roller 87 contacts the CD-roller 63, the O
The rotational force of the roller 83 passes through the switching roller 87 to the CrJ-
The lawn mower moves forward.

Also, when the switching roller 87 contacts the P roller 84, the rotational force of the O roller 83 is cut off*D-ra 8713 and P roller 84
It is transmitted to the C roller 63 via the roller 84, and the lawn mower moves backward. Since the operation of the swing motor 88 is controlled by the controller of the above embodiment, such a traveling device 81
G. Even if you set the lawn mower forward J3 and reverse I! l Can be simply controlled remotely.

In addition, in the above-mentioned steering system ff10, the winding is explained as using the transmission device (the rear wheel side steering wheel 7 rings brocket 39, the front wheel side steering wheel bottom 44 and the steering wheel chain 45). and ■ A winding 11) transmission mechanism using a belt or the like may be used.

〔Effect of the invention〕

As described above, the white-blade traveling lawn mower according to the present invention includes an engine and a lawn mowing section equipped with a mower cutter rotationally driven by the engine, and a traveling section equipped with a drive wheel on a frame. Since the frame is configured to cover the entire lawn mowing section, it is possible to realize a lawn mower that can run with zero force, and it is also possible to suitably protect the lawn mowing section from obstacles especially during running.

4. IFI of drawings! Figure 1 is a plan view showing an embodiment of the self-blade mower according to the present invention, and Figures 2, 3, and 4 are II of Figure 1.
5 is a sectional view taken along V-Va in FIG. 2, and FIG. 6 is a sectional view taken along Vl-Vl line in FIG. 1. Figure, Figure 7! l! Second
The ■ part of the figure is an enlarged view, Figure 8 J3 and Figure 9 are the ■- part of Figure 1.
(2) A sectional view taken along lines J3 and IX--IX, and FIG. 10 is a partial plan view showing another embodiment of the present invention.

1... Mower case, 2... Engine, 3... Mower cutter, 4... Crankshaft, 5... Lawn mowing section,
6... Front wheel, 7... Rear wheel, 8... Running part, 9...
- Traveling part frame, 10... Steering device, 11
... Traveling device, 12... Suspension device, 13... Main frame, 14... Subframe, 17A... Bumper, 18... Suspension bolt, 19... Suspension nut,
21...Bearing, 23...Handle, 24...
・Vibration prevention device, 26... holder, da, 28... bar

Claims (1)

[Claims] A lawn mowing section including an engine and a mower cutter rotationally driven by the engine, and a running section having a frame with drive wheels, and the frame of the running section is configured to cover the entire lawn mowing section. A self-blade traveling lawn mower featuring: