Walk-behind work machine

Abstract

To avoid an operation in which mud adhering to a wheel is lifted in large amounts and fed ahead of a machine body, by adding a small and structurally-simple member.SOLUTION: A walking-type work machine includes a tire wheel 21 for travel drive, a work device 23 for ground work, which is positioned behind the tire wheel 21, and a control lever 16 for travel control. A scraper 4 for scraping mud adhering to the tire wheel 21 is provided around the outer periphery of the tire wheel 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a walk-behind working machine that is equipped with tires and wheels for driving the machine, a working device for ground work, and a steering handle for walking and steering the machine. [Background technology]

[0002] One example of this type of walk-behind work machine is one that has an engine mounted on the upper side of an engine bed and the engine and related equipment covered by an engine hood to protect the engine from rainwater and mud splashed by the wheels (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-295849 A (see paragraphs "0015", "Fig. 1", and "Fig. 2") Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, a structure in which the engine is mounted on the upper surface of the engine bed and the engine and related equipment are covered with an engine hood is useful for protecting the engine and peripheral equipment from rainwater and mud splashed by the wheels. However, when a large amount of mud attached to the wheels is lifted up during driving on wet ground, the engine bed and engine hood prevent the mud from reaching the location of the engine. However, if various operating tools are provided in a location not covered by the engine hood, the mud may adhere to the operating tools, causing them to move in an unexpected direction or, conversely, making it difficult to move, and there is room for improvement in this respect. It is also possible to make the engine hood extremely large to cover all the operating tools, but this would be inconvenient in that it would hinder the miniaturization of the entire aircraft.

[0005] The present invention is made possible to prevent a large amount of mud adhering to the wheels from being lifted up and sent forward of the aircraft by adding a small member with a simple structure. [Means for solving the problem]

[0006] The walk-behind working machine according to the present invention comprises: Running Driving tires and wheels; A working device for ground work located behind the tire wheel; A control handle for walking control is provided, A scraper is provided around the outer periphery of the tire wheel to scrape off mud adhering to the tire wheel. R, The surface of the scraper on the rear side of the vehicle body is inclined at a sweepback angle with respect to the radial direction of the tire wheel. It is characterized by:

[0007] According to the present invention, since a scraper for scraping off mud adhering to the tire wheel is provided around the outer periphery of the tire wheel, when a large amount of mud adheres to the tire wheel, the mud can be scraped off while the tire wheel is rotating. Therefore, it is easy to prevent unnecessary accumulation of mud on the vehicle body. In addition, the scraper is disposed with a rake angle relative to the outer periphery of the tire / wheel, making it easy to effectively scrape off mud adhering to the outer periphery of the tire / wheel.

[0008] In the present invention, it is preferable that the scraper be provided rearward of a center of rotation of the tire wheel in a traveling direction of the vehicle body.

[0009] According to the present invention, the mud scraped off by the scraper falls to the rear of the tire / wheel in the traveling direction, so the tire / wheel can easily avoid running over the fallen mud, thereby reducing the possibility that the tire / wheel will run over the mud, increasing the running resistance, or causing the vehicle to sway.

[0010] In the present invention, it is preferable that the scraper is provided above a center of rotation of the tire wheel.

[0011] According to the present invention, the scraper acts to scrape off a large amount of mud adhering to the tire wheel after lifting the mud above the rotation center of the tire wheel. That is, immediately after the tire / wheel surface starts to separate from the muddy surface, a large amount of mud adheres to the tire / wheel surface, but this large amount of mud that adheres immediately after the tire / wheel surface starts to separate from the muddy surface tends to fall off under its own weight over time as the tire / wheel surface rotates in the direction away from the muddy surface. As a result, by positioning the scraper above the center of rotation of the tire wheel, only mud that has been removed by its own weight over time remains on the surface of the tire wheel at the position where the scraper is located, which is above the center of rotation of the tire wheel. Therefore, the scraping operation can be performed with the amount of mud to be scraped off by the scraper reduced to a certain extent, so that the amount of mud and the load acting on the scraper during scraping can be reduced, making it easier to perform efficient scraping operation.

[0012]

[0013]

[0014] In the present invention, it is preferable that the scraper is provided at a position facing an area spanning a tread portion of the tire / wheel and a sidewall portion of the tire / wheel inside the vehicle body.

[0015] According to the present invention, mud adhering to the tread portion of a tire / wheel and the sidewall portion of the tire / wheel on the vehicle body side can be efficiently scraped off.

[0016] In the present invention, it is preferable that the scraper is provided at a position facing the tread portion and closer to the center of the vehicle body than a center position in a width direction of the tread portion of the tire / wheel.

[0017] According to the present invention, the area of ​​mud scraped off by the scraper is not larger than necessary, and only the necessary amount of mud can be scraped off.

[0018] In the present invention, it is preferable that the scraper is provided with a reinforcing rib along the width direction of the tread portion of the tire / wheel.

[0019] According to the present invention, even if the scraper itself is formed from a relatively thin plate material, it can be reinforced by the ribs, so that it is easy to reduce the weight of the scraper.

[0020] In the present invention, it is preferable that the rib stands rearward on a surface of the scraper on the rear side of the aircraft body.

[0021] According to the present invention, by providing a rib that stands upright facing rearward on the rear surface of the scraper's body, mud that is about to be scraped off by the scraper with a rake angle is easily guided by the standing rib and allowed to fall rearward.

[0022] In the present invention, it is preferable that the scraper is provided integrally with a scattering prevention plate for preventing scattering of mud from the working device toward the front of the machine body.

[0023] According to the present invention, by providing the scraper and the anti-scattering plate integrally, there is an advantage that they can reinforce each other.

[0024] In the present invention, a device controlled by manual operation is provided near the outer periphery of the tire wheel on the machine body forward of the scraper, It is preferable that the scraper be provided upstream of the location of the equipment in the direction of rotation of the tire wheel so as to scrape off mud that moves toward the location of the equipment as the tire wheel rotates in the forward direction of the aircraft.

[0025] According to the present invention, it is possible to suppress the sending of large amounts of mud toward the location of the equipment as the tire wheels rotate, and to prevent the equipment from being operated unexpectedly. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a left side view showing the entire walk-behind working machine. [Diagram 2] FIG. 2 is a plan view showing the entire walk-behind working machine. [Diagram 3] FIG. 4 is a side view showing the positional relationship between the scraper, the tire wheel, and the working device. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 4 is an explanatory diagram showing the operating state of a scraper. [Figure 6] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of this embodiment, the front-rear and left-right directions are described as follows unless otherwise specified. That is, the forward traveling direction (see arrow F in Figs. 1 and 2) when the walk-behind working machine is traveling for work is "front (toward the front of the machine body)", the backward traveling direction (see arrow B in Figs. 1 and 2) is "rear (toward the rear of the machine body)", the direction corresponding to the right side based on the forward posture in the front-rear direction (see arrow R in Fig. 2) is "right", and similarly the direction corresponding to the left side (see arrow L in Fig. 2) is "left". Arrow FR in Figs. 1 and 3 indicates the forward rotation direction of the wheels.

[0028] [Overall structure] As shown in Fig. 1, in the running body (corresponding to the machine body) of a walk-behind working machine, which is an example of a walk-behind working machine, an engine 11 serving as a drive source is mounted on an engine frame 10 which constitutes a part of the machine body frame 1. A fuel tank 12 is mounted above the engine 11. A transmission case 2, which constitutes the vehicle body frame 1 together with the engine frame 10, is connected integrally to the rear of the engine frame 10. The engine 11 and the transmission case 2 are interlocked to each other via a belt transmission mechanism (not shown) so as to transmit power.

[0029] The transmission case 2, to which the power of the engine 11 is input, is formed in a bifurcated shape and includes a front case 2A extending downward and a rear case 2B extending diagonally downward and rearward. Tire wheels 21 serving as running wheels are supported via an axle 20 on the lower part of the front case 2A, and a rotary tiller 23 serving as an implement is supported via a drive shaft 22 on the rear case 2B. Inside the transmission case 2, a gear transmission (not shown) is installed which changes the speed of the transmitted power of the engine 11 and transmits it to the axle 20 of the traveling drive system and the drive shaft 22 of the working drive system.

[0030] A main speed change lever 15 extends diagonally upward and rearward from the top of the transmission case 2. By operating this main speed change lever 15, the gear change operation of the gear transmission device in the transmission case 2 can be performed, and the speed change and forward / reverse rotation of the tires / wheels 21 and forward / reverse rotation of the rotary tilling device 23 can be performed.

[0031] A handle post mounting member 25 is attached to the rear of the transmission case 2, which also serves as the vehicle frame 1, and a steering handle 16 for steering extends from this handle post mounting member 25 toward the rear of the vehicle. The steering handle 16 includes a pair of left and right side handle rods 16a, 16a extending along the front-to-rear direction, and a lateral handle rod 16b connected to the rear ends of the left and right side handle rods 16a, 16a. A lever 17 for turning the working device on and off and a stop switch 18 are disposed on a side handle bar 16a on the right side of the steering handle 16. Furthermore, a hand control lever 3 (corresponding to a clutch lever) is disposed near the rear end of the steering handle 16 so as to be able to swing up and down.

[0032] The working device on / off lever 17 is used to engage and disengage a clutch (not shown) provided in the drive system of the rotary tilling device 23 provided inside the transmission case 2. By switching the working device on / off lever 17 to the off state, it is possible to stop the drive of the rotary tilling device 23 and drive only the tire / wheel 21 for traveling. The stop switch 18 is wired to the control system of the engine 11 for switching off the engine 11.

[0033] A carburetor 14 is provided to which a fuel supply pipe 12a extending from a fuel tank 12 is connected. A fuel cock 14a (corresponding to a device controlled by manual operation) is provided below the carburetor 14. By operating a lever 14b (corresponding to an operating tool) of the fuel cock 14a, the flow path within the fuel cock 14a is opened and closed to control the supply of fuel from the fuel tank 12. In addition, the fuel cock 14a can be used to remove any remaining fuel in the fuel tank 12 to the outside of the aircraft. 2 and 4, the fuel cock 14a is positioned to protrude laterally outward from the engine frame 10 in a plan view, and is located close to the tire / wheel 21 in the left-right direction. As shown in Fig. 1 and 3, the fuel cock 14a is located close to the outer periphery of the tire / wheel 21 in a side view, and is provided at a location corresponding to the upstream side in the rotational direction of the tire / wheel 21 during forward traveling (forward rotational direction FR).

[0034] [About the hand-operated lever] The hand-operated lever 3 is configured as follows. As shown in FIG. 1, the hand control lever 3 is pivotally supported to be swingable back and forth about a swing axis P1 along the left-right direction provided at the lower part of a pair of left and right side handle bars 16a, 16a of the operation handle 16. As shown in Figures 1 and 2, the hand-operated lever 3 has vertical rod portions 30 extending in the front-to-rear direction on both the left and right sides, and horizontal rod portions 31 connected to the upper ends of the left and right vertical rod portions 30, 30, and is formed into an approximately gate-like shape overall when viewed in a plane or in the front-to-rear direction.

[0035] As shown in FIG. 1, the hand control lever 3 swings up and down around the swing axis P1 between a clutch-engaged position a1 where the vertical rod portion 30 is closest to the side handle rod 16a along the upper surface of the side handle rod 16a, and a clutch-disengaged position a2 where the horizontal rod portion 31 is above and away from the upper surface of the lateral handle rod 16b.

[0036] The vertical rod portion 30 of the hand control lever 3 is linked to a clutch operating arm (not shown) of a belt transmission mechanism provided in the power transmission system from the engine 11 to the transmission case 2. The tension state of the belt transmission mechanism is changed by this clutch operating arm, so that it can be switched between a clutch-on state and a clutch-off state. Therefore, when the hand control lever 3 is in the clutch-engaged position a1, the clutch operating arm is maintained in the clutch-engaged state, and when the hand control lever 3 is operated to the clutch-disengaged position a2, the clutch operating arm is switched to the clutch-disengaged state to cut off the power transmission from the engine 11 to the transmission case 2. In this way, the hand control lever 3 serves as a main clutch lever that engages and disengages the main clutch.

[0037] The hand control lever 3 is always biased to the clutch disengagement position a2 by a biasing mechanism (not shown). When the horizontal rod portion 31 of this hand control lever 3 is in the clutch engagement position a1, it is possible to work while driving the vehicle by gripping the horizontal rod portion 31 together with the lateral handle rod 16b of the control handle 16. In this state, when the hand is released from the hand control lever 3 or the steering handle 16, the horizontal rod portion 31 of the hand control lever 3 separates from the horizontal handle rod 16b and swings upright toward the clutch disengagement position a2. In other words, the hand control lever 3 is configured as a deadman's lever, which automatically goes into the clutch disengagement state when the hand is released.

[0038] 〔scraper〕 As shown in FIGS. 1 to 5, a scraper 4 for scraping off mud adhering to a tire / wheel 21 is provided around the outer periphery of the tire / wheel 21. This scraper 4 is composed of a horizontal support member 40 consisting of a long, horizontal plate-shaped body made of sheet metal, and the upper part of a vertical plate member 41 provided between the transmission case 2 and the tire / wheel assembly 21 on the front side of the body of the rotary tillage device 23.

[0039] Of these, the vertical plate member 41 is provided above and below the axle 20, as shown in Figures 3 and 5. In this structure, the portion of the vertical plate member 41 below the axle 20 is located closer to the tire inner diameter side than the sidewall portion 21b of the tire wheel 21. Therefore, it mainly functions as a scattering prevention plate to prevent mud scattered from the rotary tilling device 23 from diffusing forward. The upper part of the vertical plate member 41, i.e., the part above the axle 20, is located opposite the lateral side of the sidewall portion 21b of the tire wheel 21, and therefore functions as a scraper 4 for scraping off mud adhering to the sidewall portion 21b of the tire wheel 21.

[0040] 2 and 4, the vertical plate member 41 having the function of the scraper 4 is fixed to the right side surface of the handle post mounting member 25 between the right tire wheel 21 and the transmission case 2. A scattering prevention plate 24 is provided between the left tire wheel 21 and the transmission case 2 to prevent mud scattered from the rotary tilling device 23 from diffusing forward. This scattering prevention plate 24 has the same reinforcing rib structure as the vertical plate member 41, and is fixed to the left side surface of the handle post mounting member 25.

[0041] The horizontal tension member 40 extends laterally outward longer than the vertical plate member 41 so as to be positioned opposite the tread portion 21a of the tire / wheel 21. The horizontal tension member 40 is welded and fixed to the right side surface of the handle post mounting member 25 and to the upper portion of the vertical plate member 41 so that the lower end edge 40a of the horizontal tension member 40 faces the tread portion 21a in a state close to the tread portion 21a. The lower edge 40a of the horizontal member 40 is the starting point of the scraping action where the scraper 4 begins to scrape off the mud, and is inclined along the curved surface of the tread portion 21a of the tire wheel 21 so that it approaches the center of the tire wheel 21 as it moves toward the inside of the vehicle, i.e., the side closer to the vertical plate member 41. 3, the lateral tension member 40 fixed in this manner is attached with the rear surface 40b of the lateral tension member 40 at a sweepback angle Θ with respect to a normal line L1 from the axis 20a (corresponding to the center of rotation) of the axle 20. This sweepback angle Θ becomes the rake angle when scraping off mud adhering to the tread portion 21a, and has the function of efficiently scraping off the mud with the scraper 4.

[0042] 4 and 5, the protruding end of the lateral member 40 toward the outside of the vehicle body is located on the inside of the vehicle body relative to the position of the center line CL indicating the center position in the width direction of the tread portion 21a of the tire / wheel 21. In other words, it does not extend beyond the position of the center line CL in the width direction of the tread portion 21a toward the outside of the vehicle body. This is to avoid the problem that if the extension member 40 protrudes too far outward from the vehicle body, when a large amount of mud adheres to the tire / wheel 21, the amount of mud scraped off becomes too large, and the mud is not removed and is carried upstream in the direction of rotation together with the tire / wheel 21. In other words, by positioning the extension member 40 closer to the vehicle body center than the position of the center line CL in the width direction of the tread portion 21a of the tire / wheel 21, the mud adhered to the tread portion 21a is moved toward the vehicle body outer side, thereby preventing a large amount of mud adhering to the inside of the vehicle body from remaining. In addition, not making the protruding length of the horizontal tension member 40 outward from the aircraft body too long is also effective in reducing the load on the horizontal tension member 40 when scraping off mud.

[0043] The scraper 4 including the horizontal member 40 and the vertical plate member 41 is provided on the rear side in the traveling direction of the vehicle body, on the forward side of the axis 20a which is the center of rotation of the tire wheel 21. A rib 41a is provided at the upper end of the vertical plate member 41 so as to stand up and protrude toward the rear side of the vehicle body, across the entire width in the left-right direction of the vertical plate member 41. This rib 41a is provided so as to follow the width direction of the tread portion 21a of the tire / wheel 21, and by fixing the vertical plate member 41 to the horizontal member 40 by welding, it acts as a reinforcing rib not only for the vertical plate member 41 but also for the horizontal member 40. Furthermore, because this rib 41a is located at the upper end of the vertical plate member 41, even if mud scattered from the rotary tillage device 23 or mud scraped off by the horizontal member 40 and the vertical plate member 41 attempts to travel up the vertical plate member 41 and over the scraper 4, the mud can be guided in the direction of reversal, as shown by the arrow 42 in the figure, making it easy to drop efficiently. An inner wall 41b that stands upright so as to protrude toward the rear side of the aircraft body is provided on the inside side of the vertical plate member 41 and extends in the up-down direction of the vertical plate member 41. This inner wall 41b also acts as a reinforcing wall for the vertical plate member 41. And, because this inner wall 41b is present on the inside side of the vertical plate member 41, it is possible to prevent mud scraped off from the tire wheel 21 by the scraper 4 from falling near the joint between the transmission case 2 and the working device 23 or near approximately the center in the left-right direction of the working device 23. This makes it possible to prevent excessive dirt caused by mud near the joint between the transmission case 2 and the working device 23. Also, it is possible to prevent disturbance of the field before work caused by mud concentrating and falling near approximately the center in the left-right direction of the working device 23, and it is possible to improve the accuracy of work by the working device 23.

[0044] The above embodiment can prevent a large amount of mud from being sent toward the location of the fuel cock 14a and lever 14b as the tire / wheel 21 rotates, and can prevent the fuel cock 14a and lever 14b from being accidentally operated.

[0045] [Another embodiment 1] In the embodiment, the scraper 4 has been exemplified as having a structure in which the horizontal tension member 40 is fixed by welding to the upper part of the vertical plate member 41, but the structure is not limited to this. For example, the part corresponding to the horizontal tension member 40 and the part corresponding to the vertical plate member 41 may be composed of a single plate material. The other configurations may be the same as those of the above-described embodiment.

[0046] [Another embodiment 2] In the embodiment, the reinforcing rib 41a is provided on the upper part of the vertical plate member 41, but the present invention is not limited to this structure. For example, the reinforcing rib may be wider in the horizontal direction so as to cover a part of the horizontal member 40 or the entire width of the horizontal member 40. The other configurations may be the same as those of the above-described embodiment.

[0047] [Another embodiment 3] In the embodiment, the scraper 4 has been exemplified as having a structure formed by combining the horizontal member 40 and the vertical plate member 41, but the scraper 4 is not necessarily limited to this structure. For example, the vertical plate members 41 may not be used, and the horizontal members 40 alone may be used, or the horizontal members 40 may be provided with reinforcing ribs 41a. The other configurations may be the same as those of the above-described embodiment.

[0048] [Alternative embodiment 4] In the embodiment, the horizontal tension member 40 used has a laterally outward protruding end that does not extend beyond the position of the center line CL in the width direction of the tread portion 21a of the tire wheel 21, but this is not necessarily limited to this, and the laterally outward protruding end may protrude laterally outward by a long distance beyond the position of the center line CL. The other configurations may be the same as those of the above-described embodiment.

[0049] [Alternative embodiment 5] In the embodiment, the scraper 4 is exemplified as having a structure in which the horizontal member 40 and the vertical plate member 41 are arranged at the same position in the circumferential direction of the tire wheel 21, but this structure is not necessarily limited to this. For example, the horizontal members 40 and the vertical plate members 41 may be separate members provided at separate positions in the circumferential direction of the tire / wheel 21 .

[0050] In the embodiment, the scraper 4 is exemplified as being configured to act only on the right-side tire wheel 21, but this is not necessarily limited to this configuration, and a separate scraper 4 may be provided to act on the left-side tire wheel 21. The other configurations may be the same as those of the above-described embodiment. [Industrial Applicability]

[0051] The walk-behind working machine of the present invention can also be used as a walk-behind working machine of various kinds, such as a walk-behind cultivator, a rice transplanter, or a vegetable transplanter. [Explanation of symbols]

[0052] 3. Clutch lever 4. Scraper 14 Carburetor 14a Equipment (fuel cock) 14b Operating tools (levers, fuel cock levers) 16 Steering wheel 16a Side handle 16b Horizontal handlebar 20a Rotation center 21 Tires and wheels 21a Tread area 21b Sidewall CL center position 23 Working Equipment 41 Shatter prevention plate (vertical plate member) 41a Rib, reinforcing rib

Claims

1. Tire wheels for driving the vehicle; A working device for ground work located behind the tire wheel; A control handle for walking control is provided, A scraper is provided around the outer periphery of the tire wheel to scrape off mud adhering to the tire wheel, A walk-behind working machine in which a surface of the scraper on the rear side of the machine body is inclined at a sweepback angle with respect to a radial direction of the tire wheel.

2. 2. The walk-behind work machine according to claim 1, wherein the scraper is provided rearward of a center of rotation of the tire wheel in a traveling direction of the machine body.

3. 3. The walk-behind working machine according to claim 1, wherein the scraper is provided above a center of rotation of the tire wheel.

4. The walk-behind working machine according to any one of claims 1 to 3, wherein the scraper is provided at a position opposite to an area spanning a tread portion of the tire / wheel and a sidewall portion of the tire / wheel on an inner side of the vehicle body.

5. The walk-behind working machine according to any one of claims 1 to 4, wherein the scraper is provided at a position facing the tread portion, closer to the center of the vehicle body than the center position in the width direction of the tread portion of the tire wheel.

6. 6. The walk-behind working machine according to claim 1, wherein the scraper is provided with a reinforcing rib extending along the width direction of a tread portion of the tire wheel.

7. 7. The walk-behind work machine according to claim 6, wherein the rib stands rearward on a surface of the scraper on the rear side of the machine body.

8. 8. The walk-behind working machine according to claim 1, wherein the scraper is provided integrally with a scattering prevention plate for preventing scattering of mud from the working device toward the front of the machine body.

9. A device controlled by manual operation is provided on the machine body forward of the scraper and near the outer periphery of the tire wheel, The walk-behind working machine according to any one of claims 1 to 8, wherein the scraper is provided upstream of the location of the equipment in the direction of rotation of the tire / wheel so as to scrape off mud that moves toward the location of the equipment as the tire / wheel rotates in the forward direction of the machine body.

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