JPH0448663Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a traveling drive device for a self-propelled mower.

<Prior art> A self-propelled mower equipped with a drive wheel on the mower frame is
Although it is already well known in the past, conventionally, in most cases, ordinary tire wheels have been used as driving wheels.

<Problems to be solved by the invention> However, since the width of tire wheels is relatively narrow, the ground pressure is large, which causes damage to the grass when mowing the grass on a golf course green, for example. It was hot.

<Means for Solving the Problems> In view of such conventional problems, the present invention provides a drive shaft 13 between the pair of left and right side plates 2 of the mower frame 1.
is supported, and a pair of left and right drum-shaped drive wheels 19 are provided on the drive shaft 13 through a pair of disks 20 and 21 so as to be relatively rotatable. The drive wheels 19 are provided so as to surround substantially the entire length of the drive wheels 19 and to be close to each other in the axial direction.
A differential device 24 is provided between the pair of drive wheels 9 and covered by the drive wheels 19 from the outer periphery.

<Operation> When the vehicle is running, power is transmitted from the drive shaft 13 to the left and right drive wheels 19 via the differential device 24, and the vehicle is driven by the rotational force of the drive wheels 19. In this case, since the drive wheel 19 is drum-shaped, the ground pressure is low and does not damage the lawn or the like.

During steering, the rotational speed of the left and right drive wheels 19 changes due to the differential function of the differential device 24, so that the vehicle can be easily steered even though the drive wheels 19 are drum-shaped.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In Figs. 1 to 3, 1 is a mower frame, and a pair of left and right side plates 2 are connected by an upper horizontal member 3. , is configured in a roughly gate shape when viewed from the front. 4 is an engine placed in the upper center of the mower frame 1,
Power is transmitted to the traveling transmission shaft 7 and the cutter transmission shaft 8 via the belt transmission mechanisms 5 and 6. Note that each transmission shaft 7, 8 has a bearing body 11, which is attached to the mower frame 1 via brackets 9, 10.
12 etc.

Reference numeral 13 denotes a drive shaft, which is disposed laterally on the lower rear side of the mower frame 1, and one end of which is connected to the transmission shaft 1 supported by the side plate 2 via a bearing 14 and a bearing case 15.
6, and the other end is supported by the side plate 2 via a bearing 17 and a bearing case 18. Drive shaft 1
3, a pair of left and right drum-shaped drive wheels 19 are provided so as to be relatively rotatable via a pair of disks 20 and 21, and a rubber body 22 for cushioning is provided on the outer periphery of the drive wheels 19.
is removably wound around a screw 23 or the like. Note that the rubber body 22 may be cylindrical, or
It may be band-shaped.

The left and right drive wheels 19 are located close to each other in the axial direction, and a differential device 24 for transmitting rotational power from the drive shaft 13 to each drive wheel 19 is installed between the left and right drive wheels 19. 19 so that it is covered from the outer periphery. Differential device 24
is equipped with a differential pinion 25 and a pair of left and right differential side gears 26 in a differential case 27, the differential pinion 25 is coupled to the drive shaft 13 together with the differential case 27 by a pin 28, and each differential side gear 26 is connected to the disc 21 of the drive wheel 19. combined.

The transmission shafts 7 and 16 are connected to a chain transmission mechanism 29 and a gear reduction mechanism 3 provided on the outside of one side plate 2.
They are linked together via 0.

31 is a handle for pushing by hand, and a support shaft 32
It is pivotally supported on the rear side of the mower frame 1, is swingable within a predetermined range by a pin 33 and a long hole 34, and is urged in the upright direction by a spring 35.

A reel cutter 36 is arranged in the left-right direction at the front of the mower frame 1, and is supported by a cutter frame 39 consisting of a pair of left and right side plates 37 and an upper horizontal member 38. The reel cutter 36 has a pair of flanges 41 fixed to a cutter shaft 40 in the left and right direction,
A plurality of spiral cutter blades 42 are attached in the circumferential direction so as to straddle this. A fixed blade 43 is supported between the left and right side plates 37 at the rear lower part of the reel cutter 36, and as the reel cutter 36 rotates, grass such as a lawn is cut between the cutter blade 42 and the fixed blade 43. It's summery.

The cutter frame 39 is pivotally connected to the horizontal member 46 of the mower frame 1 at a connecting portion 44 at the upper center of the horizontal member 38 by a mounting pin 45 in the front and rear direction. The mounting pin 45 can be inserted and removed from the front. Between the horizontal members 46 and 38 of the mower frame 1 and the cutter frame 39, a pair of left and right bullet lowering mechanisms 49 consisting of a guide rod 47 and a spring 48 are installed on the cutter frame 39, as shown in FIG.
The mounting pin 45 is provided to allow swinging around the mounting pin 45. The guide rod 47 is pivotally connected to the horizontal member 38 by a pin 50, and is inserted into a hole in the horizontal member 46 so as to be vertically movable.

One side plate 37 of the cutter frame 39 is integrally provided with a protrusion 51 that protrudes rearward and diagonally upward.
3 is installed. The transmission shaft 53 and the cutter shaft 40 are interlocked and connected via a chain transmission mechanism 54. The bearing case 52 and the transmission shaft 53 protrude inwardly through a hole 54 formed in the side plate 2 of the mower frame 1 so as to be freely movable up and down. It is connected to the cutter transmission shaft 8. Note that this joint 55 is detachable.

A pair of front and rear gauge wheels 56, 57 are provided on the lower side of the cutter frame 39. Note that the front gauge wheel 56 is connected to the pivot pin 5 via a bracket 58.
9 so as to be vertically movable within a predetermined range, and is urged downward by a spring 60. 61,
62 is a transmission cover. The handle 31 may be a rod-shaped one provided in the center, or may be gate-shaped and its base supported by the left and right side plates 2.

In the above configuration, when mowing the lawn of a golf course, etc., the mowing is carried out by the driving force of the drive wheels 13 while the mowing is carried out by holding the handle 31 and pushing it by hand.

The running power is transmitted from the engine 4 to the belt transmission mechanism 5,
Transmission shaft 7, chain transmission mechanism 29, gear reduction mechanism 30, transmission shaft 16, drive shaft 13, differential device 24
The signal is transmitted equally to the left and right drive wheels 19 through the , thereby causing the drive wheels 19 to rotate. In this case, the drive wheel 19 is drum-shaped and long in the axial direction, so that the ground pressure is small and does not damage grass or the like.

When turning, when the handlebar 31 is pushed in the left-right direction, a rotation difference is generated between the left and right drive wheels 19 due to the differential function of the differential device 24, so even though the drive wheels 19 are drum-shaped, Can be easily turned.

The reel cutter 36 includes a belt transmission mechanism 6, a transmission shaft 8, a universal joint 55, a chain transmission mechanism 53, and a cutter shaft 40 from the engine 4.
Since power is transmitted through the reel cutter 36, the reel cutter 36 rotates around the cutter shaft 40 in the direction of the arrow in FIG. In this case, in the reel cutter 36, the front and rear gauge wheels 56, 57 are grounded, the ritter frame 39 is swingably supported around the mounting pin 45, and is biased downward by the left and right bullet lowering mechanisms 49. Therefore, it follows the undulations of the ground, resulting in a good finished mowing mark. Also, by changing the strength of the spring 48 of the bullet lowering mechanism 49,
The followability of the reel cutter 36 can be controlled.

When the rubber body 22 becomes worn out, it can be replaced with a new one, and it is more convenient to replace it in the form of a band.

<Effects of the invention> According to the invention, since a drum-shaped pair of left and right drive wheels is used, the ground pressure of the drive wheels is low and there is no damage to the lawn or the like. Furthermore, since power is transmitted to the left and right drive wheels via the differential device, steering can be performed easily despite the fact that the drive wheels are drum-shaped. In addition, the left and right drive wheels 9 surround the outer periphery of the drive shaft 13 over substantially the entire length, and are provided so as to be close to each other in the axial direction, and the differential device 24 is provided between the pair of drive wheels 9 and Since it is provided so as to be covered from the outer periphery by the wheels 19, the differential device 24 can be compactly incorporated between the drive wheels 9 without being exposed or protruding to the outside. Further, the outer periphery of the differential device 24 can be surrounded and protected by the driving wheels 19, and the outer side of the differential device 24 can be closed by the pair of disks 20, 21 and the side plate 2. Therefore, the differential device 24 can be surrounded by the driving wheels 9, disk 1
0, 11 and the side plate 12, and there is no need for a special protective case to protect the differential device 24. From this point of view, the number of components can be minimized to improve driving performance. The entire drive device can be made compact, easy to manufacture, and provided at low cost, and its practical effects are significant.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention,
Figure 1 is a sectional view of the main parts, Figure 2 is a side view of the whole,
FIG. 3 is a schematic front view of the reel cutter support section, and FIG. 4 is a sectional view of the bullet lowering mechanism. 1...Mower machine frame, 4...Engine, 13...
Drive shaft, 19... Drive wheel, 24... Differential device, 3
6...Reel cutter, 39...Cutter frame.

Claims (1)

[Scope of utility model registration request] A drive shaft 13 is supported between a pair of left and right side plates 2 of the mower frame 1, and a pair of left and right drum-shaped drive wheels 19 are relatively rotatable on the drive shaft 13 via a pair of disks 20 and 21. The left and right drive wheels 19 surround the outer periphery of the drive shaft 13 over substantially the entire length, and are provided so as to be close to each other in the axial direction, so that the rotational power from the drive shaft 13 is transmitted to each drive wheel 19. The differential device 24 that transmits the transmission is connected to the pair of drive wheels 9
A traveling drive device for a mower, characterized in that it is provided so as to be covered from the outer periphery by the drive wheels 19.