JP2022102302A - Service vehicle - Google Patents

Abstract

To provide a service vehicle which includes a work part provided at a front part of a travel machine body and can further include an air cooling engine in a state that dust is less likely to enter the engine even if dust occurs in the work part and the engine can be cooled efficiently.SOLUTION: An air cooling type engine 4 is provided at a rear end part of a travel machine body 2. In the engine 4, a cooling air introduction part 50 is provided protruding from an engine body toward the rear of the travel machine body.SELECTED DRAWING: Figure 2

Description

The present invention relates to a work vehicle.

Some work vehicles are provided with a traveling machine body supported by a pair of left and right crawler traveling devices, and a working unit provided at the front portion of the traveling machine body. As a work vehicle of this type, for example, there is a mower shown in Patent Document 1. The mower is equipped with a mower as a working unit.

The mowing machine shown in Patent Document 1 includes an engine and a radiator for cooling the engine, and the radiator is configured to be cooled by a fan driven by an electric motor.

Japanese Unexamined Patent Publication No. 4-197104

It is desired to provide an air-cooled engine in place of the one shown in Patent Document 1.

The present invention provides a work vehicle capable of being provided with an air-cooled engine in a state where the engine can be efficiently cooled while making it difficult for dust to enter the engine even if dust is generated in the work unit.

The work vehicle according to the present invention
A traveling machine supported by a pair of left and right crawler traveling devices, an air-cooled engine provided in the traveling machine, and a working portion provided in the front portion of the traveling machine are provided, and the engine is the engine. It is provided at the rear end portion of the traveling machine body, and the engine is provided with a cooling air introduction portion so as to project backward from the engine body.

According to this configuration, the engine is installed at the rear end of the traveling machine, which is easy to touch the air outside the machine and the dust generated in the working part is hard to fly, so that the cooling air introduction part protrudes backward from the engine body. Since the cooling air is introduced at the place where the dust is generated, the engine can be cooled efficiently, and even if dust is generated in the working part, it is difficult for the dust to enter the engine.

In the present invention
It is preferable that a dustproof case is provided to cover the cooling air introducing portion in a state where the cooling air introduced by the cooling air introducing portion is dust-removed.

According to this configuration, the dustproof case acts to remove dust from the cooling air introduced into the cooling air introduction portion, so that it is difficult for the engine to enter dust.

In the present invention
It is preferable that a recoil starter device for starting the engine is provided inside the dustproof case, and the starting line of the recoil starter device is pulled out to the outside of the dustproof case.

According to this configuration, the recoil starter device can be operated even with the dustproof case attached, so that it is easy to start the engine.

In the present invention
The dustproof case is provided so as to be removable, and it is preferable that the through hole provided in the dustproof case for inserting the starting rope is a notch hole.

When removing the dustproof case, the starting rope naturally comes out from the through hole toward the notch, so that the dustproof case can be easily removed without the special trouble of removing the starting rope from the dustproof case.

In the present invention
The working unit is preferably a mowing device for mowing and crushing mowed grass.

According to this configuration, the cut grass is crushed in the working part, but the cut grass can be cut while making it difficult for the crushed cut grass to enter the engine.

It is a left side view which shows the whole of a mower. It is a right side view which shows the whole of a mower. It is a top view which shows the whole of a mower. It is a rear view of a mower. It is a right side view which shows the driving part and the traveling transmission device. It is a top view which shows the driving part and the traveling transmission device. It is a left side view which shows the cooling air introduction part. It is a front view of the engine with the connecting member and the transmission case removed. It is a front view of the engine in the state which the connecting member is attached. It is a vertical sectional front view of a transmission case. It is a front view of the engine with the connecting member and the transmission case attached. It is a schematic diagram which shows the traveling transmission device and the work transmission device.

Hereinafter, embodiments that are an example of the present invention will be described with reference to the drawings.
In the following description, regarding the traveling machine of the grass mowing machine (an example of a work vehicle), the direction of the arrow F shown in FIGS. The direction of the arrow U shown in 1, 2 and 4 is "upward of the aircraft", the direction of the arrow D is "downward of the aircraft", the direction of the arrow L shown in FIGS. 3 and 4 is "left of the aircraft", and the direction of the arrow R. Is "to the right of the aircraft".

[Overall composition of the mower]
As shown in FIGS. 1, 2, and 3, the mower includes a traveling machine body 2 supported by a pair of left and right crawler traveling devices 1. A mowing device 3 as a working unit is provided on the front portion of the traveling machine body 2. A driving portion 5 having an engine 4 is provided at the rear portion of the traveling machine body 2. The left and right crawler traveling devices 1 are driven by transmitting power from the engine 4 by a traveling transmission device 6 provided over the crawler traveling device 1 and the engine 4. The mowing device 3 is driven by transmitting power from the engine 4 by a work transmission device 7 connected to a lateral portion of the mowing device 3. The traveling machine body 2 is equipped with a control device (not shown) that controls the crawler traveling device 1 and the mowing device 3. The control device is configured to receive a control command from a radio control device (not shown) and perform operations such as maneuvering the traveling machine 2 and driving and stopping the mowing device 3 based on the received control command. There is. The mower is configured to be remotely controllable by a radio-controlled device. The mower is configured as a so-called radio-controlled mower.

[Structure of crawler traveling device]
As shown in FIGS. 1 and 2, the left and right crawler traveling devices 1 include a track frame 10 extending in the front-rear direction of the traveling machine body 2. The track frame 10 is supported by the lower part of the airframe frame 8. The ground ring body 11 is rotatably supported at three locations arranged in the front-rear direction of the track frame 10. The tension ring body 12 is provided on the rear side of the rearmost ground contact ring body 11 among the three ground contact ring bodies 11. The tension wheel body 12 is rotatably supported by the rear portion of the track frame 10. A drive wheel body 13 is provided above the central portion of the track frame 10 in the front-rear direction. The drive wheel body 13 is operably supported by a transmission 20 provided in the traveling transmission device 6. The crawler belt 14 is wound around the ground contact wheel 11, the tension wheel 12, and the drive wheel 13 at three locations.

[Structure of mowing device]
As shown in FIGS. 1, 2, and 3, the mowing device 3 is connected to the machine frame 8 via an elevating connection mechanism 30, and the elevating shaft core P extending in the lateral width direction of the traveling machine 2 is used as a swing fulcrum. It is provided on the traveling machine body 2 in a state where it can swing up and down. The elevating cylinder 35 is connected to the rear frame 40 provided in the rear part of the mowing device 3 and the cylinder support portion 8a provided in the machine body frame 8. The mowing device 3 is moved up and down by the expansion and contraction operation of the elevating cylinder 35.

As shown in FIGS. It is provided with a left connecting portion 32 to be connected.

As shown in FIGS. 2 and 3, the connecting link 31 is connected to the rear frame 40 provided at the rear of the mowing device 3 and the link support portion 8b provided at the machine frame 8. The connecting link 31 is supported by the link support portion 8b in a state where it can swing up and down with the elevating shaft core P as a swing fulcrum.

The left connecting portion 32 is connected to a transmission cylinder 33 supported by the front portion of the machine frame 8 in a state of extending in the lateral width direction of the traveling machine body 2, and to the left end portion of the transmission cylinder 33 and the left lateral side portion of the mowing device 3. It is equipped with a transmission case 34 and a transmission case 34. The transmission case 34 is supported by the transmission cylinder 33 in a state where it can swing up and down with the elevating shaft core P as a swing fulcrum.

The mowing device 3 includes a cutting blade housing 41 as shown in FIGS. 1, 2, and 3. Inside the cutting blade housing 41, a cutting blade 43 having a support shaft 42 extending in a direction along the lateral width direction of the traveling machine body 2 is provided. Ground gauge rings 44 are provided at two locations on the left and right sides of the front portion of the cutting blade housing 41. The two left and right ground gauge wheels 44 are provided in a state of being grounded on the front side of the cutting blade housing 41. The cutting blade 43 is provided so as to be rotatable around the axis of the support shaft 42 as the center of rotation. A knife blade 45 is provided on the outer peripheral portion of the support shaft 42. The knife blades 45 are arranged side by side along the axis of the support shaft 42 and arranged in the circumferential direction of the support shaft 42. The mowing device 3 is configured as a frail mower, and mows the grass and crushes the mowed grass with the knife blade 45.

[Structure of driving part]
As shown in FIGS. It has an engine exhaust muffler 9c provided on the lateral side of the fuel tank 9a on the front side of 9b and the air cleaner 9b.

The engine 4 is provided at the rear end of the traveling machine body 2. The engine 4 has a crankcase portion 4a and a cylinder portion 4b extending diagonally upward from the crankcase portion 4a. The crankcase portion 4a has a flywheel portion 4c formed at the rear portion of the crankcase portion 4a. The engine 4 is supported by the machine frame 8 by connecting the lower portion of the crankcase portion 4a to the engine mounting portion 8c provided on the machine frame 8.

[Structure of cooling air introduction part]
The engine 4 is configured to be air-cooled and has a cooling air introduction unit 50 for introducing engine cooling air. As shown in FIGS. 5 and 7, the cooling air introducing portion 50 is provided so as to project backward from the crankcase portion 4a as the engine main body.

Specifically, as shown in FIG. 7, the cooling air introduction unit 50 is projected backward from the rotary fan 51, the air guide cover 52 located around the outer periphery of the rotary fan 51, and the air guide cover 52. It also has an intake cover 53.

The rotary fan 51 is integrally formed at the rear portion of the flywheel 54 of the engine 4, and is driven by the crank shaft 55. The wind guide cover 52 is composed of a fly wheel case. In the present embodiment, the rotary fan 51 integrally formed with the flywheel 54 is adopted, but a rotary fan configured as a member different from the flywheel 54 may be adopted.

As shown in FIGS. 4, 5 and 7, the cooling air introduction portion 50 is covered with a dustproof case 56. More specifically, the portion of the cooling air introduction portion 50 where the intake cover 53 is located is covered with the dustproof case 56. The dustproof case 56 has a plurality of ventilation holes that allow the cooling air introduced by the cooling air introduction unit 50 to flow into the dustproof case and prevent the inflow of dust such as cut grass mixed in the cooling air into the dustproof case. 56a is provided. The dustproof case 56 removes dust from the cooling air introduced by the cooling air introduction unit 50.

As shown in FIG. 7, a recoil starter device 57 for starting the engine 4 is provided inside the dustproof case 56. The recoil starter device 57 has a starter device main body 57a that is connected to the crank shaft 55 and is provided with a starting rope 58, and a starter case 59 that covers the starter device main body 57a. The intake cover 53 is composed of a starter case 59.

As shown in FIG. 1, the starting rope 58 is pulled out of the dustproof case 56 through the through hole provided in the intake cover 53 and the through hole 56b provided in the dustproof case 56, and the dustproof case 56 is drawn. A starter grip 58a is provided at the end of the starting rope 58 located on the outside. As shown in FIG. 7, the dustproof case 56 has a vertical wall portion 56c and a side wall portion 56d extending forward from the peripheral portion of the vertical wall portion 56c. The side wall portion 56d is provided over the entire circumference of the vertical wall portion 56c. The through hole 56b provided in the dustproof case 56 through which the starting rope 58 is inserted is opened in the side wall portion 56d of the dustproof case 56. As shown in FIG. 1, the through hole 56b is configured as a notch hole so that the starting rope 58 naturally comes out from the through hole 56b to the notch opening side (front side) when the dustproof case 56 is removed. ing. The notch hole extends from the edge of the side wall portion 56d on the opening side of the dustproof case 56 toward the bottom side of the dustproof case 56 in the side wall portion 56d.

As shown in FIG. 7, the dustproof case 56 is configured to be detachably supported by the support member 60. The support member 60 is attached to the air guide cover 52. Detachable support of the dustproof case 56 to the support member 60 is performed by a connecting bolt that allows the dustproof case 56 to be inserted from the outside of the dustproof case 56 and engaged with the support member 60. The support member 60 has a base portion 60a to which the side wall portion 56d of the dustproof case 56 is fitted, and an arm portion 60b extending backward from the base portion 60a and to which the inner surface side of the vertical wall portion 56c is applied. ing. The support member 60 is configured such that, in a state where the dustproof case 56 is attached, a portion of the opening of the dustproof case 56 formed by the side wall portion 56d, which is located away from the intake cover 53, is closed by the base portion 60a. There is.

In the cooling air introduction unit 50, the rotary fan 51 is driven by the crank shaft 55, and the air located outside the dustproof case 56 is dust-removed through the ventilation hole 56a of the dustproof case 56 by the blowing action of the driven rotary fan 51. The engine 4 is introduced into the dustproof case 56, and further introduced into the inside of the intake cover 53 through the ventilation hole of the intake cover 53 to generate cooling air, and the generated cooling air is passed around the flywheel 54 by the rotating fan 51. Will be introduced to.

[Structure of traveling transmission device]
As shown in FIGS. 5 and 6, the traveling transmission device 6 includes a transmission 20 provided in front of the engine 4 and a transmission case 21 provided between the engine 4 and the transmission 20. As shown in FIG. 6, the transmission 20 is movably supported by the drive wheels 13 of the pair of left and right crawler traveling devices 1. As shown in FIGS. 10 and 12, the transmission case 21 houses a gear interlocking mechanism 22 that interlocks and connects the output shaft 4d of the engine 4 and the input shaft 20a of the transmission 20. The output shaft 4d projects forward from the front portion of the engine 4. The input shaft 20a projects rearward from the rear of the transmission 20.

In the traveling transmission device 6, the power from the output shaft 4d of the engine 4 is transmitted to the input shaft 20a by the gear interlocking mechanism 22 and input to the transmission 20, and is transmitted to the left and right drive wheels 13 by the transmission 20.

Specifically, as shown in FIGS. 10 and 12, the gear interlocking mechanism 22 is interlocked with the output shaft side gear 23 that is interlocked with the output shaft 4d and rotates integrally with the output shaft 4d, and is interlocked with the input shaft 20a. It is provided with an input shaft side gear 24 that is rotated integrally with the input shaft 20a. The interlocking connection of the output shaft side gear 23 to the output shaft 4d is performed by interlocking and connecting the support shaft 23a of the output shaft side gear 23 to the output shaft 4d. The interlocking connection of the input shaft side gear 24 to the input shaft 20a is performed by interlocking and connecting the support shaft 24a of the input shaft side gear 24 to the input shaft 20a via the relay shaft 25. The output shaft side gear 23 and the input shaft side gear 24 are meshed with each other, and the gear interlocking mechanism 22 reverses the power of the output shaft 4d and transmits the power to the input shaft 20a.

As shown in FIGS. A right traveling drive unit 20R, which is connected to the right side portion of the input distribution unit 20X and has a right drive wheel body 13 so as to be driveable, is provided.

As shown in FIG. 12, the input distribution unit 20X has an input shaft 20a, and the power of the input shaft 20a is transmitted via the gear mechanism 26a, and the transmitted power is transmitted to the left travel drive unit 20L and the right travel drive. It has a distribution transmission shaft 26 that distributes and transmits to and from the unit 20R.

As shown in FIG. 12, the left traveling drive unit 20L and the right traveling drive unit 20R drive the power shifted by the continuously variable transmission unit 27 and the continuously variable transmission unit 27 to which the power of the distribution transmission shaft 26 is input. It has a gear transmission mechanism 28 that transmits to the body 13. The stepless speed change unit 27 is composed of a hydrostatic type stepless speed change device.

As shown in FIGS. 5 and 6, the transmission case 21 is configured to be connected to the engine 4 by the coupling mechanism 65 and supported by the engine 4 via the coupling mechanism 65.

As shown in FIGS. 5, 6, 9 and 11, the connecting mechanism 65 includes a connecting member 66 interposed between the engine 4 and the transmission case 21, and a first fastener for fastening the connecting member 66 to the engine 4. The first connecting bolt 67 is provided as a second connecting bolt 68 as a second fastener for fastening the transmission case 21 to the connecting member 66.

As shown in FIG. 9, a through hole 69 through which the output shaft 4d is inserted is provided in the central portion of the connecting member 66. The diameter of the through hole 69 is a circular shape centered on the axis of the output shaft 4d, and is sized so that a convex portion formed on the front portion of the engine 4 fits into the through hole 69. A first bolt hole 67a for attaching the first connecting bolt 67 is provided at the edge of the through hole 69 in the connecting member 66, and a second connecting is provided at a portion located on the outer peripheral side of the connecting member 66 with respect to the first bolt hole 67a. A second bolt hole 68a for attaching the bolt 68 is provided. The attachment of the first connecting bolt 67 in the connecting member 66 is configured to be performed at the edge of the through hole 69, and the attachment of the second connecting bolt 68 in the connecting member 66 is performed by the connecting member 66 rather than the first connecting bolt 67. It is configured to be performed on the part located on the outer peripheral side. The first connecting bolt 67 and the second connecting bolt 68 are configured to be attached to a plurality of places.

As shown in FIGS. 10, 11 and 12, the transmission case 21 is divided into two divided cases 21A in the direction along the axis of the output shaft 4d. The connection between the two split cases 21A is configured by a third connecting bolt 70 as a third fastener separate from the first connecting bolt 67 and the second connecting bolt 68.

The input shaft 20a and the output shaft 4d are arranged so as to be located at different positions in the vertical direction of the machine body and in the lateral direction of the machine body. Specifically, the input shaft 20a is arranged at a position higher than the output shaft 4d. In a plan view, the input shaft 20a is arranged so as to be located on the center line CL in the left-right direction of the traveling machine body 2. The output shaft 4d is arranged so as to be located on the side of the machine body with respect to the input shaft 20a. As shown in FIGS. 10 and 11, the transmission case 21 is a transmission case such that the engine side portion 21E formed at the lower part of the transmission case 21 so that the output shaft 4d is connected and the input shaft 20a are connected. It is provided with a mission side portion 21M formed on the upper portion of the 21. As shown in FIG. 10, the connection between the transmission case 21 and the connecting member 66 by the second connecting bolt 68 is configured to be performed only in the engine side portion 21E of the engine side portion 21E and the transmission side portion 21M. There is.

As shown in FIGS. 10 and 11, the breather valve 71 is connected to the transmission case 21. As shown in FIG. 10, a breather opening 72 for connecting the breather valve 71 is opened in the flange portion 21f in the split case 21A of one of the two split cases 21A. A wall portion 73 for preventing the flow of lubricating oil toward the breather port 72 is projected inside the split case 21A. The wall portion 73 prevents the lubricating oil located inside the transmission case 21 from leaking to the breather valve 71 due to the tilting or swaying motion of the traveling machine body.

The transmission case 21 can be supported by the engine 4 based on the following mounting method.
The transmission case 21 is placed in an assembled state in which the two split cases 21A are connected by the third connecting bolt 70. As shown in FIG. 9, the connecting member 66 is connected to the engine 4 by the first connecting bolt 67. Next, as shown in FIG. 11, the engine side portion 21E of the transmission case 21 is connected to the connecting member 66 by the second connecting bolt 68.

[Structure of work transmission device]
As shown in FIG. 12, the work transmission device 7 includes a work clutch 74 provided inside the transmission case of the transmission 20, a relay transmission device 75 provided in front of the transmission 20, and a lateral portion of the mowing device 3. It is provided with a transmission case 34 to which the front portion is connected, and a transmission cylinder 33 provided over the rear portion of the transmission case 34 and the relay transmission device 75.

The work clutch 74 is configured so that the power transmitted from the engine 4 to the input shaft 20a of the transmission 20 is input via the gear interlocking mechanism 76 and the transmission shaft 77. The relay transmission device 75 is configured such that the output of the work clutch 74 is input via the transmission shaft 78, and the input power is transmitted to the transmission shaft 80 by the gear interlocking mechanism 79. The transmission case 34 is configured so that the power of the transmission shaft 80 is input and the input power is transmitted to the cutting blade 43 by the belt transmission mechanism 81.

[Another Embodiment]
(1) In the above-described embodiment, an example in which the recoil starter device 57 is provided is shown, but the recoil starter device 57 may not be provided.

(2) In the above-described embodiment, the rotary fan 51 is integrally formed with the flywheel 54, but the rotary fan 51 may be provided with a rotary fan configured as a separate member from the flywheel 54.

(3) In the above-described embodiment, an example in which the dustproof case 56 is provided is shown, but the dustproof case may not be provided.

(4) In the above-described embodiment, the example in which the mowing device 3 is provided as a working unit is shown, but various working devices such as a snow removal device may be provided as a working unit.

The present invention can be applied to a work vehicle provided with a traveling machine body supported by a pair of left and right crawler traveling devices and a working section provided at the front portion of the traveling machine body.

1 Crawler traveling device 2 Traveling machine 3 Working part (grass cutting device)
4 Engine 4a Engine body (crankcase)
50 Cooling air introduction part 56 Dustproof case 56b Through hole 57 Recoil starter device 58 Starting line

Claims (5)

A traveling machine supported by a pair of left and right crawler traveling devices,
The air-cooled engine installed in the traveling machine and
A work unit provided at the front portion of the traveling machine body is provided.
The engine is provided at the rear end of the traveling machine body, and the engine is provided at the rear end portion of the traveling machine body.
A work vehicle in which the engine is provided with a cooling air introduction unit so as to project backward from the engine body. The work vehicle according to claim 1, further comprising a dustproof case that covers the cooling air introduction unit in a state where the cooling air introduced by the cooling air introduction unit is dust-removed. A recoil starter device for starting the engine is provided inside the dustproof case.
The work vehicle according to claim 2, wherein the starting rope of the recoil starter device is pulled out to the outside of the dustproof case. The dustproof case is provided so that it can be attached and detached.
The work vehicle according to claim 3, wherein the through hole provided in the dustproof case so that the starting rope is inserted is a notch hole. The work vehicle according to any one of claims 1 to 4, wherein the working unit is a grass cutting device that cuts grass and crushes cut grass.

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