JPH045794Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive device used in a drive system of a working machine such as a power lawn mower.

(Prior Art) A small power lawn mower is moved by wheels, mowing work is performed by rotating a cutter on the underside of the machine, and the cutter and wheels are driven by engine power. Since such a lawn mower has a slow speed change during work, it is convenient to move the lawn mower forward and backward at the same time, so that mowing work can be performed continuously without changing direction.

(Technical problem to be solved by the invention) In order to selectively switch between forward and backward movement, a transmission gear is required, and small working machines such as lawn mowers have a simple structure, are small, and are inexpensive. Preferably, a pair of driven friction disks is provided on the output shaft to the wheel, and a driving friction roller is provided between them, so that one of the disks engages with the roller for forward rotation, and the other disk is rotated by the roller. By engaging with the rotor, it is possible to reverse rotation and switch forward movement, thereby simplifying the structure, downsizing, and reducing costs.

By the way, the above-mentioned friction roller has conventionally been formed separately from the member that drives it, and therefore requires a support mechanism for the roller and a mechanism for driving the roller separately from the drive member, resulting in a large number of parts. There is still room for improvement, such as the fact that the structure is complicated, a drive mechanism is required, and a space is required because the roller is separate from the drive member.

The present invention was made to solve the above technical problems, and its purpose is to further simplify the structure, reduce the number of parts, save space, reduce size, and reduce costs. The purpose of the present invention is to provide a drive device for a working machine, etc.

(Means for solving the technical problems) The means for solving the above technical problems is to integrate rotation on the output shaft, provide a friction disk movable in the axial direction, and selectively engage with the friction disk. In a drive device equipped with a friction roller that is driven by the output from the engine, the driven member that is rotated in a horizontal plane by belt transmission from the engine is formed of a two-stage member, and the first stage is a driven pulley. A friction roller is integrally formed on the second stage side.

(Effects of the above means) According to the above means, the friction roller and its driving member are integrated, so the number of parts is reduced.
The structure is also simplified, the number of man-hours required for assembling the drive device is reduced, the installation space can be saved, further downsizing can be achieved, and costs can be reduced.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a lawn mower as an example of a working machine.
The symmetry of implementation is not limited to this and is arbitrary.

The lawnmower 1 is equipped with two front wheels 3 consisting of rolling wheels on the front left and right sides of the machine body 2, and two rear wheels 4 consisting of drive wheels on the rear left and right sides, and an engine 5 on the machine body 2. Further, a handle 6 is provided at the rear so as to be inclined rearward and upward.

The fuselage 2 consists of a frame 7 and a housing 8 as shown in FIGS. 4 and 5, and an engine 5 is mounted on the frame 2. The engine is a vertical engine with a vertical crankshaft, and a clutch mechanism 9 is attached to the lower end of an output shaft 501. A vertical cutter drive shaft 101 is fixedly fixed to the outer 902 below, and the lower half of the shaft 101 extends downward from the boss portion 702 of the container-shaped main body 701 of the frame 7. The cutter 10 is fixed to the lower end, and the main body 701 is surrounded by a bowl-shaped middle part 801 of the housing 8.

The front wheels 3, 3 are supported by a support 1 that is horizontally mounted on two arms 703, 703 provided at the front of the frame 7.
The rear wheels 4, 4 are supported via the stays 12, 12 at both ends of the frame 7, and the bases 131, 14 are supported by two arms 704, 705 provided on the rear left and right sides of the frame 7.
1 is connected to reduction cases 13 and 14 via support shafts 401 and 401.

Between the base parts 131 and 141 which are the upper parts of the reduction cases 13 and 14, an intermediate transmission shaft 15 serving as a drive shaft is horizontally mounted, and both ends of the intermediate transmission shaft 15 are rotatably supported by bearings 16.
The final drive shaft 18 is supported horizontally between the boss portions 132 and 142 at the intermediate portions of the reduction cases 13 and 14, and one end portion 151 is extended and the sprocket 17 is fixed thereto. is rotatably supported by a bearing 19, and a pinion 20 is fixed to each end of the shaft and meshed with quintanal gears 402, 402 provided on the inner surfaces of the rear wheels 4, 4. When the shaft 18 rotates, the pinion 20 rotates the rear wheel. 4, 4 are rotationally driven, and the shaft 18 passes through a cylindrical holding member 21 that is horizontally fixed between the opposing inner end surfaces of the boss portions 132 and 142. A sprocket 22 is fixedly installed in front of the pinion 20 at one end 181 of the shaft 18, and this is connected to the sprocket 17 via a chain 23, so that the shaft 1
The output of 5 is transmitted to shaft 18.

A pair of friction disks 24 and 25 are arranged on the intermediate portion of the intermediate transmission shaft 15, spaced apart in the axial direction, and are rotatable together with the shaft 15 via cylindrical boss portions 241 and 251, and are slidable in the axial direction. provided, boss part 2
A return spring 26 is compressed around the shaft between opposing ends of the shafts 41 and 251, and the spring 26 is covered with a dust boot 27 to prevent dust.

A pulley 28 including a friction roller is disposed below between the peripheral friction portions 242 and 252 of the friction disks 24 and 25.

The driven pulley 28 is connected via a belt 30 to a drive pulley 31 provided via a bearing 29 on the periphery of the vertical output shaft 501 above the clutch mechanism 9.
The lower engagement plate 311 of the drive pulley 31 engages with the upper end of the clutch outer 902, and is driven by the rotation of the outer clutch 902.

The driven pulley 28 consists of a large-diameter pulley part 281 that the belt 30 engages with, and a cylindrical boss part 282 provided at the center of the pulley part 281, and a cylindrical boss part 282 that extends rearward into the center part of the main body 701 of the frame 7. A boss portion 707 is provided at the rear end of the support stay portion 706 to protrude upward, a support shaft 32 is provided on the boss portion 707, and the boss portion 282 is rotatably supported via a bearing 33. Small diameter boss part 28
2 includes a pulley portion 281, a large-diameter base portion 283 welded in the embodiment, an intermediate portion 284 with a smaller diameter than this, and an upper portion 285 with a smaller diameter.
For example, rubber is baked or otherwise bonded around the roller 85 to integrally form a friction roller 286 whose outer diameter portion is a flat circumferential surface. Such roller 2
Reference numeral 86 faces between the lower portions of the friction portions 242 and 252 of the friction disks 24 and 25.

The power is connected and disconnected from the pulley 31 to the pulley 28 by tightening and loosening the belt 30 by the clutch pulley 34. In the figure, 35 and 36 are swingable door plates that close the front and rear openings 802 and 803 of the housing 8. .

In the above, the friction disk 24, 2
5 slides on the shaft 15, and the other side slides on the roller 2.
By frictionally engaging with the pulley 86, the power to the pulley 281 is output to the shaft 15, causing the rear wheel to rotate in the forward or backward direction, thereby moving forward and backward.

(Effects of the invention) As is clear from the above, according to the invention, the friction roller is integrally formed with a step on its driving member, that is, the pulley in the embodiment, which is different from providing it separately. This eliminates the need for a support transmission mechanism, reducing the number of parts, simplifying the structure, and reducing assembly work as it is integrally supported by a support shaft coaxial with the pulley. , it is easy to assemble, which is advantageous in terms of manufacturing, the pulley and roller are integrated, which is advantageous in terms of space, and further miniaturization can be achieved, and the above can reduce costs. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic side view of a lawn mower as an example of a working machine, Fig. 2 is a vertical side view of a friction roller, and Fig. 3 is a rear wheel drive mechanism. FIG. 4 is a vertical sectional side view of the lawn mower, and FIG. 5 is a cross-sectional plan view thereof. In the drawing, 5 is the engine, 501 is its output shaft, 9 is the clutch mechanism, 15 is the intermediate transmission shaft, 2
4 and 25 are friction disks, 28 is a driven pulley, 286 is a friction roller, and 30 is a belt.

Claims (1)

[Claims for Utility Model Registration] A vertical engine with a vertical shaft output, a clutch mechanism connected to the engine output shaft of the vertical engine to connect and disconnect power, and friction that is rotated in a horizontal plane by the output of the clutch mechanism. It consists of a friction roller made of a wheel, and two friction disks that are rotated while selectively abutting on the outer peripheral surface of the friction roller, and the friction disks are concentric with an intermediate transmission shaft having a horizontal configuration. Further, in the driving device which is provided to be movable in the direction of the intermediate transmission shaft and opposed to each other with the friction roller in between, the friction roller of the driving device receives the output of the clutch mechanism of the driving device by a belt. What is claimed is: 1. A drive device that is fixed to a driven pulley that rotates in a horizontal plane, and is coaxially integrated with the driven pulley.