Walking type work machine

Abstract

To enable an engine to be started with a simple and easy operation, in a walking type working machine comprising the engine for driving a working device.SOLUTION: An electric starting motor 44 is provided which drives an engine start operation unit 35 provided in an engine 3. The engine 3 is provided with an electronically controlled fuel injection unit 32, and an electronic control device 33 linked to the electronically controlled fuel injection unit 32. An electronically controlled fuel injection device 31 is provided which injects and supplies fuel to the engine 3 through the electronic control device 33 controlling the injection of the electronically controlled fuel injection unit 32.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a walking type working machine.

Background Art

[0002] As shown in Patent Document 1, there is a walking type working machine including a machine body (machine body frame) supported by a traveling device (tire wheels), a working device (rotary tilling device) connected to the machine body, and an engine supported at the front part of the machine body for driving the working device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a walking type working machine that starts the engine by operating a recoil starter, or in a walking type working machine that operates a choke to adjust the air - fuel ratio so that the engine starts easily when the engine is difficult to start in winter or the like, it takes time and effort to start the engine.

[0005] The present invention provides a walking type working machine that can start the engine simply and easily.

Means for Solving the Problems

[0006] The walking type working machine according to the present invention is An aircraft supported by a running gear, a working device connected to the aircraft, an engine supported at the front of the aircraft and driving the working device, an electric starting motor driving an engine starting operation unit provided in the engine, an electronically controlled fuel injection unit provided in the engine, and an electronic control device associated with the electronically controlled fuel injection unit, wherein the electronically controlled fuel injection unit injects and supplies fuel to the engine by being injection-controlled by the electronic control device, an electronically controlled fuel injection device is provided.

[0007] According to this configuration, when an operation is performed to drive the electric starting motor, the engine starting operation unit is driven by the electric starting motor to perform the starting operation of the engine. The electronic control device performs injection control of the electronically controlled fuel injection unit corresponding to the starting of the engine, and the electronically controlled fuel injection unit can inject and supply fuel to the engine in a supply state adapted to engine starting. Therefore, regardless of seasons such as winter, the engine can be started easily and simply by only performing an operation to drive the electric starting motor.

[0008] Also, since the electronic control device can automatically perform injection control of the electronically controlled fuel injection unit, for example, it is possible to automatically adjust the engine speed according to fluctuations in the engine load due to fluctuations in the working load.

[0009] In the present invention, It is preferable that the electronic control device is covered by an aircraft accessory provided at the front of the aircraft.

[0010] According to this configuration, even when the front part of the aircraft is lowered when the aircraft is turning and running, the electronic control device can be protected by using the aircraft accessory as a cover for the electronic control device so that the electronic control device does not hit the field, such as being covered by the aircraft accessory.

[0011] In the present invention, It is preferable that the aircraft accessory is a balance weight.

[0012] According to this configuration, a balance weight can be utilized for the cover of the electronic control unit to protect the electronic control unit at low cost.

[0013] In the present invention, It is preferable that the balance weight includes a bottom wall-like portion located below the electronic control unit, a front wall-like portion rising from the bottom wall-like portion to the front side of the electronic control unit to cover the electronic control unit from the front, and left and right side wall-like portions rising from the left and right side portions of the bottom wall-like portion to the lateral outside of the electronic control unit to cover the electronic control unit from the lateral outside.

[0014] According to this configuration, since the electronic control unit is covered from below by the bottom wall-like portion, from the front by the front wall-like portion, and from the lateral outside by the left and right side wall-like portions, a balance weight can be utilized for the cover of the electronic control unit to protect the electronic control unit at low cost.

[0015] In the present invention, It is preferable that the balance weight is provided with ventilation holes penetrating the bottom wall-like portion.

[0016] According to this configuration, since air circulates from the inside to the outside or from the inside to the outside of the balance weight through the ventilation holes, the electronic control unit can be cooled by the circulating air to suppress the temperature rise of the electronic control unit.

[0017] Another walking work machine according to the present invention includes a machine body supported by a traveling device, a steering handle extending rearward from the machine body, a working device connected to the machine body, an engine supported at the front portion of the machine body for driving the working device, a cover attached to a stay located above the engine for covering the engine from above, and a fuel injection unit provided in the engine for injecting and supplying fuel to the engine, the fuel injection unit being provided with an electronic governor, and fuel injection being controlled by the electronic governor.

[0018] Since the fuel injection is controlled by an electronic governor and the engine operates, the engine can be started easily and simply regardless of seasons such as winter. When the fuel injection to the engine is controlled by a mechanical governor, a mechanical linkage mechanism is connected so that a control signal is transmitted to the mechanical governor. According to this configuration, since the fuel injection to the engine is controlled by an electronic governor, an electric wire is connected so that a control signal is transmitted to the electronic governor. By connecting an electric wire that requires less space for installation compared to the mechanical linkage mechanism, the position of the stay can be lowered. By being able to lower the position of the stay, the position of the cover can be lowered. By being able to lower the position of the cover, it can be made less likely that the cover becomes an obstacle to seeing through from the rear of the machine body to the front of the machine body, and it can be made easier to see through from the rear of the machine body to the front of the machine body.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0020] Hereinafter, an embodiment of a walking-type management machine, which is an example of a walking-type working machine according to the present invention, will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments, and various modifications are possible without departing from the gist thereof.

[0021] In addition, the directions of the machine body in the description of this embodiment are described as follows unless otherwise specified. That is, in FIGS. 1, 2, 3, etc., the direction indicated by the arrow F is the [front direction of the machine body], the direction indicated by the arrow B in FIGS. 1, 2, 3, etc. is the [rear direction of the machine body], the direction indicated by the arrow U in FIGS. 1, 3, etc. is the [upper direction of the machine body], the direction indicated by the arrow D in FIGS. 1, 3, etc. is the [lower direction of the machine body], the direction indicated by the arrow L in FIG. 2, etc. is the [left direction of the machine body], and the direction indicated by the arrow R in FIG. 2, etc. is the [right direction of the machine body]. The left-right direction of the machine body corresponds to the width direction of the machine body.

[0022] 〔Overall configuration〕 As shown in FIGS. 1, 2, and 3, the walking-type management machine includes a machine body 2 supported by a pair of left and right tire wheels 1 as a traveling device. In this embodiment, the traveling device is a pair of left and right tire wheels 1, but in addition to the tire wheels 1, a crawler traveling device can also be adopted. An engine 3 is provided at the front part of the machine body 2. A fuel tank 4 for the engine is provided on the rear side of the engine 3. As shown in FIGS. 4 and 5, an exhaust muffler 5 is provided on the left lateral side of the rear part of the engine 3. An air cleaner 6 is provided on the right lateral side of the rear part of the engine 3. A steering handle 7 extends rearward and upward from the rear part of the machine body 2. At the rear part of the steering handle 7, an accelerator operating tool 8 (see FIG. 2) for the engine 3 and a starting switch 9 for the engine 3 are provided. A rotary tilling device 10 as a working device is connected to the rear part of the machine body 2. In this embodiment, the working device is the rotary tilling device 10, but in addition to the rotary tilling device 10, other types of devices such as a ridger and a seeder may be used.

[0023] The airframe 2 is provided with an airframe frame 13 composed of a mission case 11 and an engine support frame 12 extending forward from the mission case 11. The mission case 11 is formed in a bifurcated shape with a front case 11A and a rear case 11B extending obliquely rearward and downward from the upper part of the front case 11A. The engine 3 is supported by the engine support frame 12 in a mounting posture where the crankshaft (not shown) extends along the vehicle width direction. The steering handle 7 extends from the rear case 11B. The pair of left and right tire wheels 1 are supported by an axle 14 provided at the lower part of the front case 11A.

[0024] The power output by the engine 3 is input into the mission case 11 via a belt transmission mechanism 15 (see FIG. 4). The input power is transmitted to a traveling mission (not shown) and a working mission (not shown) provided inside the mission case 11, transmitted from the traveling mission to the tire wheels 1, and transmitted from the working mission to the rotary tilling device 10.

[0025] As shown in FIGS. 1 and 2, a main shift lever 16 extends rearward and upward above the steering handle 7 from the rear part of the mission case 11. By operating the main shift lever 16, the traveling mission can be shifted to perform a shift operation and a forward / reverse operation of the tire wheels 1, and the working mission can be shifted to perform a forward / reverse operation of the rotary tilling device 10.

[0026] The belt transmission mechanism 15 constitutes a belt tension type main clutch and enables the on / off of power transmission to the tire wheels 1 and the rotary tilling device 10. The main clutch can be turned on and off by a clutch lever 17 provided at the rear part of the steering handle 7 so as to be swingable. The clutch lever 17 is configured as a dead man lever.

[0027] 〔Regarding the cover device〕 As shown in FIGS. 1, 2, and 3, a cover device 20 is provided to cover the engine 3, the fuel tank 4, etc.

[0028] As shown in FIGS. 1, 2, and 3, the cover device 20 is located across the upper portion of the engine 3 and the upper portion of the transmission case 11, and includes an upper cover 21 that covers the upper portions of the engine 3, the fuel tank 4, and the transmission case 11 from above, a muffler cover 22 that is located below the portion of the upper cover 21 that covers the engine 3 and the fuel tank 4 and covers the exhaust muffler 5 from the left lateral outer side, a transmission mechanism cover 23 that is located below the muffler cover 22 and covers the belt transmission mechanism 15 from the left lateral outer side, and a guide cover 24 that covers the lever guide 19 (see FIG. 4) of the main shift lever 16. An exhaust hole 22a for allowing the exhaust from the exhaust port 5a of the exhaust muffler 5 to flow out of the muffler cover is opened at the front portion of the muffler cover 22. A tank cover portion 22b for covering the fuel tank 4 from the left lateral outer side is provided at the rear portion of the muffler cover 22.

[0029] As shown in FIGS. 4 and 5, a first stay 25 is provided above the engine 3, and a second stay 26 is provided behind the fuel tank 4. The first stay 25 is constituted by the front portion of the tank support member 27. The second stay 26 is attached to the rear portion of the tank support member 27. The first stay 25 and the second stay 26 are held by the tank support member 27. The front end portion of the tank support member 27 is held by the engine 3 via the connecting member 18, and the rear end portion of the tank support member 27 is held by the lever guide 19. The tank support member 27 is held by the engine 3 via the connecting member 18 and held by the transmission case 11 via the lever guide 19. The tank support member 27 supports the fuel tank 4 at a portion behind the first stay 25.

[0030] As shown in FIG. 4, the upper cover 21 is configured to be attached to the first stay 25 and the second stay 26 by connecting bolts and supported by the tank support member 27 via the first stay 25 and the second stay 26.

[0031] As shown in FIG. 2, the upper cover 21 is configured to be divisible into a first cover portion 21A, a second cover portion 21B, and a third cover portion 21C. The first cover portion 21A is formed to have a size that spans the upper portion of the engine 3 and the upper portion of the transmission case 11. As shown in FIG. 6, a long opening 28 extending in the front-rear direction and spanning the upper portion of the engine 3 and the upper portion of the transmission case 11 is provided at the central portion of the first cover portion 21A in the left-right direction. The second cover portion 21B is configured to be fitted into the upper-tank opening portion located above the fuel tank 4 in the opening 28 to fill and close this upper-tank opening portion. A fuel filling hole through which the fuel filling port 4a of the fuel tank 4 passes is opened in the second cover portion 21B. The third cover portion 21C is configured to be fitted into the upper-engine opening portion located in front of the upper-tank opening portion and above the engine 3 in the opening 28 to fill and close this upper-engine opening portion. Among the opening 28, the portion located behind the upper-tank opening portion is passed through by the guide cover 24 and is closed by the guide cover 24.

[0032] The assembly and installation of the upper cover 21 are carried out based on the following procedures. As shown in FIG. 6, the first cover part 21A is left without the second cover part 21B and the third cover part 21C. The front connecting part 29 provided at the front part of the first cover part 21A is attached to the first stay 25 by a connecting bolt, and the rear connecting parts 30 provided at both lateral sides of the rear part of the first cover part 21A are attached to the second stay 26 by connecting bolts. Next, the second cover part 21B is fitted into the tank upper opening part of the first cover part 21A. A connecting part (not shown) provided at the rear part of the second cover part 21B is engaged with a holding part (not shown) provided at the front part of the guide cover 24. Connecting parts (not shown) provided at both lateral sides of the front part of the second cover part 21B are connected to the holding part 20a provided at the intermediate part in the front-rear direction of the first cover part 21A by connecting screws. The tank upper opening part of the openings 28 of the first cover part 21A is filled and closed by the second cover part 21B, and the second cover part 21B is connected to the first cover part 21A. Next, the third cover part 21C is fitted into the engine upper opening part of the first cover part 21A. A connecting part (not shown) provided at the rear part of the third cover part 21C is engaged with a holding part (not shown) provided at the front part of the second cover part 21B. A connecting part (not shown) provided at the front part of the third cover part 21C is engaged with the holding part (20b) provided at the front part of the first cover part 21A. The engine upper opening part of the openings of the first cover part 21A is filled and closed by the third cover part 21C, and the third cover part 21C is connected to the first cover part 21A.

[0033] 〔Regarding the drive of the engine〕 As shown in FIG. 7, the engine 3 includes a crankcase part 3A having a crankshaft and a cylinder part 3B extending from the crankcase part 3A and having a piston. An electronic control fuel injection device 31 for supplying fuel to the cylinder part 3B is provided.

[0034] As shown in FIG. 7, the electronic control fuel injection device 31 has an electronic control fuel injection part 32 provided in the intake part 3C in the cylinder part 3B and an electronic control unit (ECU) 33 linked to the electronic control fuel injection part 32.

[0035] In the electronic control fuel injection device 31, the fuel stored in the fuel tank 4 is supplied to the electronic control fuel injection unit 32 by the fuel pump 34, and the supplied fuel is injected into the intake section 3C by the electronic control fuel injection unit 32 and then injected and supplied to the cylinder section 3B. Detection information such as an accelerator sensor 8a that detects the operation amount of the accelerator operating tool 8, a start sensor 36 that detects the operation of the engine start operation unit 35 as an engine start operation, and a temperature sensor 37 that detects the temperature of the engine 3 is transmitted to the electronic control device 33, and the injection control of the electronic control fuel injection unit 32 is performed by the electronic control device 33 that operates based on each detection information, and the fuel injection supply by the electronic control fuel injection unit 32 is performed in a supply state corresponding to each detection information.

[0036] Since the fuel injection supply adapted to the operation amount of the accelerator operating tool 8 is performed, the engine 3 is driven at a rotational speed that accurately responds to the accelerator operation, and the engine can be driven with good response and good fuel efficiency. Since the injection control based on the temperature detection of the engine 3 is performed, the fuel injection supply adapted to the temperature of the engine 3 is automatically performed, and even when the temperature of the engine 3 is low in winter or the like, the engine 3 can start smoothly without taking the trouble of special fuel adjustment.

[0037] Specifically, as shown in FIG. 7, the electronic control fuel injection unit 32 includes a fuel injector 38 and an electronic governor 39 provided in the intake section 3C. The electronic control device 33 is linked to the electronic governor 39.

[0038] The fuel tank 4 is connected to the fuel injector 38 via an oil supply line 40. The fuel pump 34 is provided in the oil supply line 40. A fuel cock 41 is provided in the oil supply line 40. The fuel stored in the fuel tank 4 is supplied to the fuel injector 38 by the fuel pump 34. An air cleaner 6 is connected to the intake section 3C via an intake passage 42. Due to the intake action of the engine 3, air is introduced into the air cleaner 6 and flows from the air cleaner 6 into the intake section 3C.

[0039] In the electronic control fuel injection unit 32, the electronic governor 39 is controlled by the electronic control device 33, the throttle 43 is operated by the electronic governor 39 to adjust the inflow rate of air flowing from the intake unit 3C into the cylinder unit 3B, and the amount of air mixed into the fuel injected and supplied to the cylinder unit 3B by the fuel injector 38 is adjusted.

[0040] In the electronic control fuel injection unit 32, the electronic governor 39 is controlled by the electronic control device 33, and the electronic governor 39 controls fuel injection so that fuel with an adjusted air-fuel ratio is injected and supplied to the cylinder unit 3B.

[0041] In addition, a load sensor for detecting the load of the engine 3 can be provided, and the electronic control device 33 can be configured to perform injection control of the electronic control fuel injection unit 32 based on the detection information by the load sensor. When the load of the engine 3 fluctuates due to fluctuations in the working load, the fuel injection supply to the cylinder unit 3B is performed in a supply state corresponding to the load of the engine 3.

[0042] 〔Regarding engine starting〕 As shown in FIGS. 1, 2, and 7, an engine starting operation unit 35 is provided on the side portion of the engine 3. As shown in FIGS. 5 and 7, an electric starting motor 44 is connected to the engine starting operation unit 35. In the present embodiment, the engine starting operation unit 35 is a recoil starter. The engine starting operation unit 35 is not limited to a recoil starter, and may have only a function that enables starting operation by the electric starting motor 44 and may not be manually operable. In the present embodiment, a spring-loaded recoil starter is adopted, but it is possible to adopt a recoil starter that does not have a spring-loading function. The connection of the electric starting motor 44 to the engine starting operation unit 35 is performed by interlocking a rotating member provided in the recoil starter so as to transmit the starting operation force to the crankshaft and the output shaft of the electric starting motor 44 by a gear mechanism.

[0043] By operating the pull handle 35a (see FIG. 5) of the engine starting operation unit (recoil starter) 35, the engine starting operation unit 35 operates, and the engine 3 is started by the engine starting operation unit 35. The engine 3 can also be started by operating the start switch 9 (see FIGS. 2 and 7) without operating the engine starting operation unit 35. That is, when the start switch 9 is operated, the electric starting motor 44 is driven, the engine starting operation unit 35 is driven by the electric starting motor 44, and the engine 3 is started by the engine starting operation unit 35. Thus, when starting the engine 3 by either the manual operation of the engine starting operation unit 35 or the operation of the start switch 9, the electronic control device 33 operates based on the detection information from the start sensor 36 and the detection information from the temperature sensor 37, and the injection control of the electronic control fuel injection unit 32 by the electronic control device 33 is performed. The fuel injection supply to the cylinder unit 3B by the electronic control fuel injection unit 32 is performed in a supply state adapted to the engine start and the engine temperature, and the engine 3 starts smoothly even in winter or the like.

[0044] In the above-described embodiment, the electric starting motor 44 is provided. However, in the case where the electronic control fuel injection device 31 is provided, it is possible to configure the engine 3 to be started only by the recoil starter without providing the electric starting motor 44.

[0045] As shown in FIGS. 4 and 5, the electric starting motor 44 is provided on the front side of the first stage 25. The electric starting motor 44 is easily accessible from the front of the machine body, and work such as inspecting the electric starting motor 44 is easy to perform.

[0046] As shown in FIGS. 4 and 5, a recessed portion 3D that opens upward is provided at the front portion of the engine 3. The recessed portion 3D extends across the entire width of the crankcase portion 3A (the entire length in the machine body width direction) at the front portion of the crankcase portion 3A. The electric starting motor 44 is located in the recessed portion 3D. More specifically, the longitudinal direction of the electric starting motor 44 is along the machine body width direction. The lower portion 44a of the electric starting motor 44 is located in the recessed portion 3D over the entire longitudinal direction of the motor.

[0047] As shown in FIGS. 4 and 5, the electronic control unit 33 is provided on the front side of the engine 3. It is easy to reach the electronic control unit 33 from the front of the aircraft body, and it is easy to perform operations such as inspecting the electronic control unit 33.

[0048] As shown in FIG. 4, the engine 3 is provided with a holding portion 45 that protrudes forward from the lower part of the engine 3, and the electronic control unit 33 is attached to the holding portion 45 and held by the engine 3. In the present embodiment, the holding portions 45 are provided at two positions in the lateral width direction of the aircraft body of the engine 3.

[0049] As shown in FIGS. 4 and 5, a battery 46 that supplies power to the electronic control unit 33 is provided side by side with the electronic control unit 33 in the lateral width direction of the aircraft body on the front side of the engine 3. The electronic control unit 33 and the battery 46 are located close to each other, and when performing operations such as inspecting the electronic control unit 33, it is easy to also inspect the battery 46. The electronic control unit 33 is located at the central portion in the lateral width direction of the aircraft body, and the battery 46 is located on the outer side of the aircraft body in the lateral width direction relative to the electronic control unit 33. The electronic control unit 33 is covered from the outer lateral side by the battery 46.

[0050] As shown in FIGS. 4 and 5, an oil supply port 47 for the engine is provided side by side with the electronic control unit 33 in the lateral width direction of the aircraft body on the front side of the engine 3. The electronic control unit 33 and the oil supply port 47 are located close to each other, and when performing operations such as inspecting the electronic control unit 33, it is easy to also perform oil replenishment and oil quantity inspection using an oil gauge rod attached to the supply port cap 48. The electronic control unit 33 is located at the central portion in the lateral width direction of the aircraft body, and the oil supply port 47 is located on the outer side of the aircraft body in the lateral width direction relative to the electronic control unit 33. An oil supply pipe 49 having the oil supply port 47 is located on the outer lateral side of the electronic control unit 33, and the oil supply pipe 49 has a guard function for the electronic control unit 33.

[0051] As shown in FIGS. 4 and 5, the electronic control device 33, the battery 46, and the oil supply port 47 are covered by the accessory 50 provided at the front part of the machine body 2. When the machine body 2 is turning and traveling, the steering handle 7 is lifted, and the front part of the machine body is lowered with the axle 14 as a swing fulcrum. Even when the front part of the machine body is lowered in this way, the electronic control device 33, the battery 46, and the oil supply port 47 are covered by the accessory 50 so as not to hit the field.

[0052] In the present embodiment, the accessory 50 is a balance weight, but it is not limited to the balance weight, and it may be different in form and function such as a front bumper, a front hitch, etc. In the following, the reference numeral "50" of the accessory will be used as the reference numeral of the balance weight, and it will be described by referring to the balance weight 50.

[0053] As shown in FIGS. 4, 5, and 8, the balance weight 50 includes a bottom wall-like portion 50A located below the electronic control device 33, the battery 46, and the oil supply port 47, a front wall-like portion 50B rising from the bottom wall-like portion 50A to the front side of the electronic control device 33, the battery 46, and the oil supply port 47, and left and right side wall-like portions 50C rising from the left and right side portions of the bottom wall-like portion 50A to the laterally outer sides of the electronic control device 33, the battery 46, and the oil supply port 47.

[0054] In the balance weight 50, the bottom wall-like portion 50A covers the electronic control device 33, the battery 46, and the oil supply port 47 from below, the front wall-like portion 50B covers the electronic control device 33, the battery 46, and the oil supply port 47 from the front, and the left and right side wall-like portions 50C cover the electronic control device 33, the battery 46, and the oil supply port 47 from both lateral sides.

[0055] As shown in FIGS. 4 and 5, the balance weight 50 is provided with a vent hole 51 penetrating through the bottom wall-like portion 50A, and air circulates from the inside to the outside of the balance weight 50, or from the inside to the outside through the vent hole 51, and the electronic control device 33 and the battery 46 are cooled by the circulating air. The front portion of the vent hole 51 is located at the lower part of the front wall-like portion 50B.

[0056] 〔Alternative Embodiment〕 (1) In the above-described embodiment, an example in which the electronic governor 39 that operates the throttle 43 is adopted is shown. However, a fuel injector capable of adjusting the fuel injection amount may be provided, and an electronic governor that controls the injection amount of this fuel injector may be adopted.

[0057] (2) In the above-described embodiment, an example in which the electronic control device 33 is provided on the front side of the engine 3 is shown. However, it is not limited to this, and it may be provided at any location.

[0058] (3) In the above-described embodiment, an example in which the electronic control device 33 is attached to the holding portion 45 of the engine 3 is shown. However, a mounting member different from the holding portion 45 may be provided, and this mounting member is connected to the electronic control device 33 and the engine 3, and the electronic control device 33 is held by the engine via the mounting member, or a support member that is held by the airframe frame 13 without being connected to the engine 3 may be provided, and the electronic control device 33 may be attached to this support member.

[0059] (4) In the above-described embodiment, an example in which the airframe accessory 50 is a balance weight is shown. However, it is not limited to this, and it may be other than the balance weight such as a front bumper or a front hitch.

[0060] (5) In the above-described embodiment, an example in which the balance weight 50 is provided with the vent hole 51 is shown. However, it may not be provided with the vent hole 51.

[0061] (6) In the above-described embodiment, an example in which the battery 46 is provided side by side with the electronic control unit 33 has been shown. However, the present invention is not limited to this, and the battery 46 may be provided at any location.

[0062] (7) In the above-described embodiment, an example in which the oil supply port 47 is provided side by side with the electronic control unit 33 has been shown. However, the oil supply port 47 may be provided at any location.

Industrial Applicability

[0063] The present invention can be applied not only to a walking-type management machine but also to a walking-type working machine equipped with various working devices such as a ridging machine and a seeding machine.

Explanation of Signs

[0064] 1 Tire wheel (traveling device) 2 Machine body 3 Engine 7 Steering handle 10 Rotary tillage device (working device) 21 Upper cover (cover) 25 First stay (stay) 31 Electronic fuel injection device (fuel injection unit) 32 Electronic control fuel injection unit 33 Electronic control unit 35 Engine starting operation unit 39 Electronic governor 44 Electric starting motor 50 Balance weight (accessory of machine body) 50A Bottom wall-like part 50B Front wall-like part 50C Side wall-like part 51 Vent hole

Claims

1. A machine body supported by a traveling device, A working device connected to the machine body, An engine supported at the front of the machine body and driving the working device, An electric starting motor that drives an engine starting operation unit provided in the engine, An electronically controlled fuel injection device having an electronically controlled fuel injection unit provided in the engine and an electronic control device associated with the electronically controlled fuel injection unit, wherein the electronically controlled fuel injection unit injects and supplies fuel to the engine by being injection-controlled by the electronic control device. A walking type working machine equipped with.

2. The walking type working machine according to claim 1, wherein the electronic control device is covered by an accessory attached to the front part of the machine body.

3. The walking type working machine according to claim 2, wherein the accessory is a balance weight.

4. The balance weight includes a bottom wall-shaped portion located below the electronic control device, a front wall-shaped portion that rises from the bottom wall-shaped portion to the front side of the electronic control device and covers the electronic control device from the front, and left and right side portions of the bottom wall-shaped portion. The walking type working machine according to claim 3, further comprising left and right side wall-shaped portions that rise to the lateral outer side of the electronic control device and cover the electronic control device from the lateral outer side.

5. The walking type working machine according to claim 4, wherein the balance weight is provided with ventilation holes penetrating the bottom wall-shaped portion.

6. A machine body supported by a traveling device, A steering handle extending rearward from the machine body, A working device connected to the machine body, An engine supported at the front of the machine body and driving the working device, A cover attached to a stay located above the engine and covering the engine from above, A fuel injection unit provided in the engine and injecting and supplying fuel to the engine, The fuel injection unit is provided with an electronic governor, and a walking type working machine in which fuel injection is controlled by the electronic governor.

Images