JPH0698601A - Walking-type electric working machine - Google Patents

Abstract

PURPOSE:To provide a walking-type electric working machine good in balance of the weight distribution for the main body in all directions, thus easy in the steering operation of the main body through a steering handle. CONSTITUTION:In the walking-type electric working machine 1 made up of (A) the main body 2 and (B) a steering handle 3 extending from the main body backward and equipped with (1) an attachment driving shaft 15 arranged horizontally at the lower part of the main body and (2) an electric motor 20 for the driving shaft 15 at the upper part of the main body, the electric motor 20 is arranged with its revolving shaft 22 directed vertically and extended downward, and a transmission gear composed of horizontally arranged planet gears is connected to the lower end of this revolving shaft. The transmission gear is housed in a relevant case 17. An output shaft extending from the transmission gear vertically downward is drivably connected to an attachment driving shaft 15. The main body is divided into the upper and lower portions through the case 17 and a cover 39 is provided so as to cover the top of the electric motor 20, and a centrifugal fan 25 to be driven by the revolving shaft 22 is also provided in between the electric motor 20 and the transmission gear 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a steering handle which extends rearward from a main body provided with an attachment such as a tillage rotary and an electric motor for driving the attachment.
The present invention relates to a walk-behind electric working machine in which an operator operates a main body with the steering handle to perform work such as plowing.

[0002]

2. Description of the Related Art The above-described walk-behind electric working machine is conventionally known, and disclosed in, for example, Japanese Utility Model Publication No. 2-30338 as an electric power management machine. This electric control machine connects a steering handle to the rear side of the middle part of the axle case where the axle for mounting the rotary etc. is provided on the lower end side, while connecting the front end side of the deceleration case to the upper end side of the axle case and rearward of the machine body. An electric motor is attached to the rear end side of the deceleration case to be extended.

However, the electric motor is arranged with its rotation axis oriented horizontally and in the lateral direction of the machine body, and the deceleration case connected to one end of the rotation shaft is arranged on one side with respect to the longitudinal center line of the machine body. The axle case, which extends forward in parallel to the center line at an offset position and is connected to the front end side of the deceleration case, extends downward on the front-rear center line of the machine body.

In the deceleration case, there is housed a deceleration mechanism consisting of large and small timing pulleys and a timing belt wound around these timing pulleys, and provided on the output shaft of the deceleration mechanism and the axle. A chain is stretched between sprockets.

[0005]

In the above conventional electric power management machine (walking type electric working machine), an electric motor, a deceleration case,
Since the plane arrangement of the axle case is not symmetrical, the weight distribution of the front and rear and the left and right of the machine body becomes unbalanced, and it becomes difficult for the operator to operate the machine body through the steering handle.
In order to avoid this, the center of gravity of the electric motor, deceleration case, etc. must be precisely set.
It is difficult to make.

Further, since the mechanism using the pulley and the belt is used as the speed reducing mechanism, the speed reducing device becomes large in size, the size of the entire machine body is increased, and the imbalance of the weight distribution is easily promoted.

[0007]

The present invention has been made in view of the above circumstances, and in the present invention, it comprises a main body and a steering handle extending rearward from the main body. In a walk-behind electric working machine in which a horizontally arranged attachment drive shaft is provided in a lower portion of the main body portion and an electric motor for driving the attachment drive shaft is provided in an upper portion, the electric motor is oriented with its rotation axis vertically. The rotary shaft is arranged and extends downward, and the lower end of the rotary shaft is connected with a reduction gear composed of a planetary gear in which each gear is arranged horizontally, and an output shaft extending downward in the vertical direction of the reduction gear is connected. The main body is divided into an upper part and a lower part by a case of the speed reducer, which is drivingly connected to the attachment drive shaft, and a cover for covering the upper side of the electric motor is provided. Between the rotational plane it is driven by the rotation of the electric motor is provided a centrifugal fan parallel to the casing surface of the reduction gear.

In the walk-behind electric working machine of the present invention constructed as described above, the rotating shaft of the electric motor, the input shaft of the speed reducer including the planetary gears, and the output shaft of the speed reducer are the same in vertical direction. Aligned on the axis, the main weight of the main body, the electric motor and the speed reducer, are arranged in axial symmetry with respect to this axis, so the weight of the main body is well balanced in the front, back, left and right directions. To do. Further, since the electric motor, the speed reducer and the centrifugal fan all rotate around the same axis, a good dynamic balance can be obtained. Therefore, the operation of manipulating the main body via the steering handle becomes extremely easy.

Since the reduction gear is composed of a planetary gear in which each gear is horizontally arranged, its height is low, so that the overall height of the main body can be reduced to reduce the size of the main body. A large-diameter centrifugal fan can be installed between the reduction gear and the electric motor without significantly increasing the overall height.

This centrifugal fan produces cooling air that blows through the inside of the electric motor from above to below, and discharges this cooling air outward in the radial direction. The lower part of the centrifugal fan is shielded from the bottom by the case of the reduction gear which is formed in a large diameter. It is also possible to protect the part. Furthermore, since the air is sucked from the upper portion of the main body that is blocked by the case of the reduction gear in this way, the electric motor can be cooled by the clean cooling air that is wound up by the tilling rotary and does not contain dust.

If the blades provided on the peripheral portion of the rotor of the centrifugal fan and projecting upward are positioned around the lower end portion of the electric motor, the centrifugal fan can be arranged sufficiently close to the electric motor, whereby the main body is provided. The overall height of the section can be made even lower.

[0012]

EXAMPLES Hereinafter, the present invention will be described with reference to an illustrated example. FIG. 1 is a walk-type electric working machine 1 to which the present invention is applied.
Side view, FIG. 2 is a top view thereof, and FIG. 3 is III-III of FIG.
It is sectional drawing which follows the line.

The walk-behind electric working machine 1 comprises a main body 2 and a steering handle 3 extending rearward and upward from the main body 2. The steering handle 3 is formed by connecting an upper handle member 4, a lower handle member 5 and a column member 6. The upper handle member 4 is composed of left and right handle portion pieces 4a and 4b (FIG. 2) branched in a V shape, and handle grips 7 are provided at the tips of the handle portion pieces 4a and 4b, respectively.
Are provided integrally. This upper handle member 4 is
By connecting a pair of connecting plates 8 integrally provided at the lower end along both sides of the lower handle member 5 with screws 9,
The mounting angle to the lower handle member 5 can be changed as appropriate by selecting a screw hole on the connecting plate 8 which is attached to the lower handle member 5.

An inclined lower end surface of the lower handle member 5,
Flange plates 10a and 10b are fixedly attached to the similarly inclined upper end surface of the column member 6, respectively. By overlapping these flange plates 10a and 10b with each other and fastening them with screws, the lower handle member 5 and the column The member 6 is connected.

The lower end of the column member 6 has a main body 2 which will be described later.
It is fixed to the lower part of the abutment member 11. Further, the column member 6 is a bracket which is provided in the middle part thereof so as to project forward.
It is fixed to the upper part of the abutment member 11 via 12. In the middle of the column member 6, there is also a bracket protruding rearward.
13 is provided, and a drag bar 14 is fitted to a vertical cylindrical portion 13a formed at the tip of the bracket 13.

At the lower end of the abutment member 11, an attachment drive shaft 15 is horizontally supported in the left-right direction. Then, on the attachment drive shaft 15, as shown in FIG.
Tillage rotary 16 is attached as an attachment. 16a is a tilling claw, and 16b is a guide wheel.

An upper part of the abutment member 11 is a hollow cylindrical speed reducer case 17, on which a centrifugal fan case 18 and an electric motor support member 19 are sequentially stacked and fixed to each other. Then, the electric motor 20 is mounted on the electric motor support member 19,
A rib 20a provided on the lower peripheral surface is fastened to the electric motor support member 19 with a screw 21 to be supported and fixed.

The electric motor 20 is installed with its rotary shaft 22 oriented in the vertical direction (vertical direction), and an intermediate shaft 23 is coaxially connected to the end of the rotary shaft 22 extending downward from the electric motor 20. There is. A lower portion of the intermediate shaft 23 is pivotally supported by a plate 24 which serves as a bottom plate of the centrifugal fan case 18 and an upper plate of the reduction gear case 17. The centrifugal fan 25 is bolted to the intermediate shaft 23.
It is fixed by 26 and rotates integrally with the intermediate shaft 23. 27 is a blade provided on the peripheral portion of the centrifugal fan 25. An air exhaust hole 28 is formed in the peripheral wall portion of the centrifugal fan case 18.

A planetary gear unit 29 is housed in the reduction gear case 17 as a reduction gear (see FIG. 4). The sun gear 30 of this planetary gear device 29 is formed at the tip of an intermediate shaft 23 that protrudes from above into the center of the reduction gear case 17, and around the sun gear 30 there are three gears that mesh with the sun gear 30. Planet gears
31 are arranged, and these planetary gears 31 mesh with one annular gear 32 on the outside, respectively. The ring gear 32 is fixed to the reduction gear case 17, that is, the abutment member 11,
The three planetary gears 31 are pivotally supported by shafts 34 on a common drive plate 33 provided on the lower side. The drive plate 33 is integrally provided with an output shaft 35 and extends downward. The output shaft 35 is the rotary shaft 22 and the intermediate shaft 23.
And are arranged on the same axis.

When the sun gear 30 rotates together with the intermediate shaft 23, the planetary gear 31 revolves around the sun gear 30, and this revolution is taken out to the output shaft 35 via the drive plate 33, thus the intermediate shaft 23. The rotation of is reduced by the planetary gear device 29 and transmitted to the output shaft 35.

Since the sun gear 30, the planetary gear 31, and the annular gear 32 which constitute the planetary gear device 29 are arranged on the same horizontal plane, the height of the reduction gear case 17 can be low,
This contributes to lowering the overall height of the main body 2.

The output shaft 35 rotatably passes through the center of the abutment member 11 in the vertical direction, and a bevel gear 37 is provided at the lower end protruding into a space 36 formed in the lower portion of the abutment member 11. ing. The attachment drive shaft 15 runs laterally in the space 36, and a bevel gear 38 having a relatively large diameter fixedly mounted on the attachment drive shaft 15 meshes with the bevel gear 37. Therefore, the rotation of the output shaft 35 is further reduced in speed via the bevel gears 37 and 38 and transmitted to the attachment drive shaft 15, and the attachment drive shaft 15 drives the tillage rotary 16.

With the above-described structure, the electric motor 20, the centrifugal fan 25, the planetary gear unit 29, and the abutment member 11, which are the main parts of the main body 2, are arranged vertically with the same vertical axis C as the center line. The weights of these members are distributed symmetrically about the axis C, and the attachment drive shaft 15
Since all the rotating parts except the one rotate about the axis C, the main body part 2 maintains a good balance both statically and dynamically, and therefore, the steering operation of the main body part 2 via the steering handle 3 is performed. Is easy.

The upper part of the electric motor 20 is covered with a cover 39. The cover 39 has both ends fixed to the electric motor support member 19 and is attached via bolts 41 to an upper portion of a frame member 40 that straddles the electric motor 20 in a U-shape. The casing of the electric motor 20 is provided with an air intake port 42 and an air exhaust port 43 for communicating the inside and the outside at the upper part and the lower part, respectively.

When the electric motor 20 operates, the centrifugal fan 25 rotates together with it, and the centrifugal fan 25 sucks the air from the lower peripheral edge of the cover 39 into the cover 39 as shown by the arrow in FIG. Through the inside of the electric motor 20,
After cooling the main part of the electric motor 20 by passing through the inside, the exhaust port
A flow of cooling air that enters the centrifugal fan case 18 from 43 and is then discharged to the outside through the air exhaust holes 28 of the centrifugal fan case 18 is generated.

Since the lower part of the centrifugal fan 25 is blocked by the speed reducer case 17, the speed reducer case 17 is relatively robust.
It is also possible to protect the vertical rotation shaft part from dirt, pebbles, etc. that are rolled up during cultivating work, and because the wind is absorbed from the upper part of the main body that is blocked by the reduction gear case 17 in this way, The electric motor 20 is driven by the clean dust-free cooling air wound up by the rotary 16.
Can be cooled.

In the present embodiment, since the lower edge of the cover 39 is low in the front and high in the rear, the centrifugal fan 25 blows the cooling air sucked into the cover 39 at the front of the lower edge. So that the exhaust air of
A guide plate 44 is provided on the front portion. Further, a cylindrical baffle plate 45 for preventing air from being directly sucked into the centrifugal fan 25 and guiding it to the upper part inside the cover 39 is provided in the rear portion where the lower edge of the cover 39 is high. .

Since the centrifugal fan 25 is provided in a place where the periphery between the electric motor 20 and the speed reducer case 17 is not restricted, it can be made to have a large diameter to obtain a large air volume. Also, since the centrifugal fan 25 is originally low in height, the electric motor 20 and the reduction gear case 17 can be sufficiently brought close to each other. However, as shown in FIG.
Until around the lower part of the electric motor 20, that is, until the lower part of the electric motor 20 fits inside the blade 27,
It is also possible to approach the electric motor 20, and by doing so, the overall height of the main body portion 2 can be further reduced.

The electric circuit of the electric motor 20 is connected to a power supply line 49 via control components such as a breaker 46, a capacitor 47, and a relay 48 for energizing, which are arranged adjacent to the electric motor 20 and at the rear thereof. The power supply line 49 includes a lower handle member 5 made of a pipe material and a right handle member 4 also made of a pipe material.
Through the inside of b, the handle member 4b extends rearward from the end surface of the handle grip 7, and a connector 50 is provided at the tip (FIG. 2). The power supply line 49 is connected by this connector 50 to an electric cord 51 connected to an appropriate external power source, and the electric motor 20 is driven by the electric power from the external power source. Reference numeral 57 is a spring that holds the power supply line 49 and the electric cord 51 so as to extend rearward from the grip end.

On the other hand, the left handle member 4a has a structure shown in FIG.
As shown in, the operation lever is provided near the handle grip 7.
52 and the micro switch 53 operated by the operating lever 52
And are provided. The micro switch 53 is the power supply line
Similar to 49, it is connected to the energizing relay 48 by an electric wire (not shown) wired in the handle member 4a and the lower handle member 5, and pulls the operation lever 52 to the handle grip 7 side to cause the micro switch 53 to move. When engaged, the micro switch 53 is closed and the energizing relay 48 operates, the electric motor 20 is connected to the power supply line 49, and the energized state starts.

The upper front portion of the main body portion 2 is protected from an external force by a U-shaped guard member 54 which protrudes forward from the abutment member 11 and rises upward, and which opens downward when viewed from the front. ing. Further, the left and right upper sides of the tilling rotary 16 are covered with wide fenders 55. The fender 55 is supported by a bracket 56 provided on the upper portion of the abutment member 11 as shown in FIG.

In this embodiment, the electric motor 20 is an electric cord.
Although it is configured to be driven by the electric power from the external power supply supplied via 51, the same effect can be obtained also when the electric motor 20 is configured to be driven by the battery. . However, in this case, it is necessary to prevent the battery mounting position from being offset.

[0033]

According to the present invention, a main body having good weight balance in the front-back and left-right directions and good dynamic balance can be obtained. The control operation becomes easy. In addition, the overall height of the main body can be reduced to reduce the size thereof, and the electric motor can be efficiently cooled by the cooling air.

[Brief description of drawings]

FIG. 1 is a side view of a walk-behind electric working machine to which the present invention has been applied.

FIG. 2 is a top view of the walk-behind electric working machine.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a schematic side view showing relational positions of an electric motor and a centrifugal fan in another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Walk type electric working machine, 2 ... Main body part, 3 ... Steering handle, 4 ... Upper handle member, 5 ... Lower handle member, 6
... Column member, 7 ... Handle grip, 8 ... Connection plate, 9
… Screw, 10… Flange plate, 11… Abutment member, 12,13… Bracket, 14… Drag bar, 15… Attachment drive shaft, 16… Tilling rotary, 17… Reduction gear case, 18… Centrifugal fan case, 19… Electric motor support member, 20 ... Electric motor, 21 ...
Screw, 22 ... Rotating shaft, 23 ... Intermediate shaft, 24 ... Plate, 25 ... Centrifugal fan, 26 ... Bolt, 27 ... Blade, 28 ... Exhaust hole, 29 ... Planetary gear device, 30 ... Sun gear, 31 ... Planetary gear , 32 ... annular gear, 33 ... drab plate, 34 ... shaft, 35 ... output shaft, 36 ... void, 37, 38 ... bevel gear, 39 ... cover, 40 ... frame member, 41 ... bolt, 42 ... air intake, 43 ... Exhaust port, 44 ... Guide plate, 45 ... Baffle plate, 46 ... Breaker, 47 ... Capacitor, 48 ... Energizing relay, 49 ... Power supply line, 50 ... Connector, 51 ... Electrical cord, 52 ...
Operating lever, 53 ... Micro switch, 54 ... Guard member,
55 ... Fender, 56 ... Bracket, 57 ... Spring.

Claims (2)

[Claims] 1. An attachment drive shaft comprising a main body and a steering handle extending rearward from the main body, the attachment drive shaft being horizontally arranged at a lower portion of the main body, and the attachment drive shaft being driven at an upper portion. In a walk-behind electric work machine provided with an electric motor, the electric motor is arranged with its rotation axis oriented vertically, the rotation shaft is extended downward, and the gears are horizontally arranged at the lower end of the rotation shaft. A reduction gear consisting of a gear is connected, an output shaft extending downward in the vertical direction of the reduction gear is drive-connected to the attachment drive shaft, and a body of the reduction gear is divided into an upper portion and a lower portion, and A centrifugal fan that is provided with a cover that covers the upper side of the electric motor and that is driven by the rotation shaft of the electric motor and has a rotation surface parallel to the case surface of the reduction gear is provided between the electric motor and the reduction gear. A walk-type electric working machine characterized by being provided. 2. The walk-behind electric work machine according to claim 1, wherein the blades of the centrifugal fan are located around the lower end of the electric motor.