JPH1191385A - Axle supporting structure of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reasonably provide a structure for changing an axle tread for the replacement of a working device while using a machine body in common, without increasing the cost. SOLUTION: In this supporting structure, a mower is connected with a front part of a machine body, and a tread variable mechanism A by which the tread of a non-steering type front wheel can be changed, is mounted exchangeably between an expanded tread condition where an extension case 27 is mounted on an edge of an axle taking-out part of a front axle case 18, and a standard tread condition where the extension case 27 is not mounted. In the expanded tread condition, a reinforcement member 43 is connected throughout the extension case 27 and a basic part of the front axle case 18, and the reinforcement member 43 is mounted at a lower part of the front axle 9 so that the tensile force is acted on the reinforcement member 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel support structure for a working machine such as a lawnmower or a tractor, and more particularly, to a non-steerable wheel tread disposed on a working device side according to the size of the working device. The present invention relates to a tread variable structure that enables the tread to be changed.

[0002]

2. Description of the Related Art Conventional working machines are disclosed in, for example,
In the case of employing a front mount structure in which a blade-type mower is continuously provided in front of the fuselage as in a riding lawn mower disclosed in Japanese Patent No. 5746, good small turning performance is obtained by using the front wheels as non-steering wheels. Was.

[0003]

In some cases, a reel type mower is mounted instead of the blade type mower described above.
In such a case, as shown in Japanese Patent Application Laid-Open No. 9-65744, it is economical to provide versatility by sharing the aircraft. However, 3
The continuous reel mower has a considerably large width compared to the three-blade mower disclosed in the former publication, so that the airframe tends to swing from side to side, and there is room for improvement in terms of left-right balance.

To cope with this, it is effective to expand the front wheel tread on the working device side. However, to change the tread simply, a relatively large front axle case is required. It is necessary to set two types, and if this is the case, the mold cost is high, which leads to a significant increase in cost, which is poor in feasibility. Therefore, the present invention has an object to provide a structure in which a wheel tread can be changed in response to replacement of a working device while sharing an airframe, as an economical one with reduced cost increase.

[0005]

[Means for Solving the Problems]

[Configuration] In the first invention, a working device is continuously provided in front of or behind a fuselage, and among the front and rear wheels, a wheel on which the working device is continuously provided is configured as a non-steering wheel, and the working device side is provided. A variable tread mechanism that can change the tread of the wheel is provided, and the variable tread mechanism can show the extended tread state with the extension case attached to the end of the axle take-out part of the axle case and the standard tread state without the extension case attached In the extended tread state, the reinforcing member is erected and connected over the extension case and the base side portion of the axle case, and the reinforcing member is arranged so that a tensile force acts on the reinforcing member. It is characterized by.

According to a second aspect, in the first aspect, the reinforcing member includes a first member connected to the axle case, a second member connected to the extension case, and fixing means for connecting and integrating these two members. In a divided structure.

According to the structure of the first aspect, when the tread is expanded, the extension case is added to the axle case, and only one type of axle case is required. Since the extension case is a small part equivalent to the extension of the tread, even if it is molded, the mold cost is much lower than the axle case mold cost, so the total cost increase is kept to the minimum necessary. be able to.

Since the reinforcing member is connected to the extension case and the left and right intermediate portions of the axle case, the reduction in strength due to the increase in the cantilever support span due to the attachment of the extension case is compensated. Therefore, even if the tread is expanded, the axle support strength of the axle case can be set to a sufficient value. In addition, since a tensile force is applied to the reinforcing member, it is possible to configure a reinforcing member having a simple structure such as an angle member or a plate member, and a compressive force that needs to deal with buckling is applied. Inexpensive and light members are required compared to the case.

However, since both the extension case and the reinforcing member are retrofit parts to the axle case, a mounting structure that allows for dimensional errors is convenient. Therefore, according to the configuration of claim 2, the reinforcing member is connected to the first member connected to the axle case,
Since the second member connected to the extension case and the fixing means for connecting and integrating these two members are configured in a divided structure, the dimensions of the erection mounting portion on the case side and the dimensions of the mounting portion of the reinforcing member are reduced. Even if some deviation occurs, the fixing means is connected after the first and second members are connected, so that the dimensional error can be absorbed by the fixing means.

Therefore, the length of the reinforcing member can be adjusted to the actual length between the axle case and the extension case, and the axle case and the extension case are distorted due to the initial stress for forcibly mounting. , And thereby the rotation of the axle can be prevented from becoming heavy, and the original reinforcing function can be exhibited well.

[Effect] In the working machine according to the first and second aspects, the basic axle case is one type, and
The tread of the wheel can be increased while the supporting strength of the wheel is sufficient, and a wheel support structure capable of changing the tread in an economical state with little cost increase can be provided.

In the wheel supporting structure according to the second aspect of the present invention, due to the divided structure of the reinforcing member, even if a dimensional error occurs in the mounting portion, an excessive stress does not act on the cases and the original reinforcing function is effectively exhibited. There are advantages that can be done.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the engine is mounted on an engine hood 3 at the rear of a traveling body having a front wheel 1 of a non-steering drive type and a rear wheel 2 of a drive type to be steered. 4 and a grass collection container 5 above the engine hood 3.
And three reel mowers (an example of a working device B) 6, 6, and 6 are provided at the front end position of the traveling machine so as to be able to move up and down freely, and the cut grass from each reel mower 6, 6, 6 is passed through a duct 7,
A riding lawn mower that feeds into the grass collection container 5 via each suction blower 8 is configured.

A step 11 is formed at a front position of the traveling body to open forward and to both sides.
1 is provided with a control tower 12 at a front position, and a steering handle 13 is provided at an upper end position of the control tower 12.
1, a driver seat 14 is provided at a rear position, and a loop-shaped protection frame 15 for protecting an upper portion and side portions of the driver seat 14 is provided. As shown in FIG. 5, the three reel mowers 6, 6, and 6 are arranged at a center position in the left-right direction with respect to the traveling machine body and at both side positions behind the center position. The two ends of the cutting width of the reel mower 6 and the inner ends of the cutting widths of the reel mowers 6 and 6 on both sides are arranged in a positional relationship so as to overlap with each other.

The duct 7 is provided with three flexible first feeders for feeding cut grass from three reel mowers 6, 6, and 6, respectively.
Ducts 7a, 7a, 7a and these three first ducts 7
a, a, 7a, and 7a are joined at a position in front of the fuselage; and a second duct 7c, which is larger in diameter and flexible than the first duct 7a, for feeding the cut grass from the joining member 7b. The second duct 7c is arranged from the front of the body to the right side of the body, and the suction blower 8 is interposed at an intermediate position of the second duct 7c at the side of the traveling body.

Further, the suction blower 8 is connected to the second duct 7c.
Cut grass sent upward through the second duct 7c
Is sent to the receiving cylinder 16 of the grass collection container 5 through an opening formed in an oblique posture at the upper end of the container. or,
The merging member 7b is formed of a metal formed by opening a cylindrical portion connected to the first duct 7a in the front and left and right directions and opening a cylindrical portion connected by the second duct 7c upward. The merging member 7b is supported at a position in front of a center position of the traveling body in the left-right direction via a column 17 in a fixed state.

As shown in FIG. 1, a converging member 7b is provided at a portion of the second duct 7c in front of the suction blower 8.
The position directly above the part connected to the suction blower 8 is set to the highest position, and the part connected to the suction blower 8 is set to be the lowest, so that it is arranged in an oblique posture, so that the cut grass does not remain in the second duct 7c. Has become.

As shown in FIG. 1, the grass collection container 5 is attached to the container main body 5a having an opening which is opened rearward in the posture shown in FIG. And a lid 5b. The grass collection container 5 is provided with a bracket 20 provided at a position below the opening edge.
Is connected to a stay 22 formed on a support frame 21 at the rear part of the traveling body so as to be swingable around a support shaft 23 in a lateral posture, so that the grass container 5 as a whole is in the grass-collecting posture shown in FIG. And the discharge posture shown in FIG.

The cut turf sent from the receiving cylinder 16 together with the flow of air falls into the grass collection container 5 by its own weight due to a decrease in the flow velocity of the air inside the grass collection container 5 and is collected. The air is discharged from the upper space inside the grass collecting container 5 to the outside of the container via an exhaust passage (not shown) formed on the rear surface side of the lid 5b.

The release cylinder 24 for switching the attitude of the grass container 5a is connected to the bracket 20 and the support frame 2.
1 and a link member 25 for opening and closing the lid 5b in conjunction with the switching of the attitude of the grass collecting container main body 5a is provided over the stay 22 and the arm 26 connected to the lid 5b. When the grass collecting container main body 5a is set in the grass collecting posture by driving the discharge cylinder 24 to the contraction side, the lid 5b is maintained in the closed state as shown in FIG. Grass container body 5 by driving
a is changed to the second position as shown in FIG.
The receiving cylinder 16 is separated from the upper end of the duct 7c, and
With the lid 5b opened, the cut grass can be discharged with the opening of the grass collecting container main body 5a facing downward.

As shown in FIG. 5, the suction blower 8 has a drive shaft 8a in a front-rear position.
Power from the engine 4 is transmitted to the motor a through a belt tension type clutch 28, a transmission shaft 29 in a front-rear position, and a belt transmission mechanism 30 formed between the transmission shaft 29 and the drive shaft 8a. It has become something.

Further, the base end of the first arm 33 in a posture along the front-rear direction of the traveling body is swingable about an axis X in a lateral posture with respect to a center position in the left-right direction of the front end of the body frame 32. The base end of the second arm 34, which is bent toward the outside of the traveling body toward the front end side with respect to the left and right end positions of the front end of the body frame 32, around the front end of the body frame 32 around the axis X and the coaxial center in the lateral posture. The first arm 3
3. The respective reel mowers 6, 6, 6 are connected and supported at the front end position of the second arm 34.

That is, as shown in FIG.
A lift arm 36 driven up and down by a first lift cylinder 35 is provided in the vicinity of the base end of No. 3 and the lift arm 36 and the base end of the first arm 33 are connected in a suspended state via a link member 37. Also, as shown in FIG. 7, each of the second arms
4. An arm 34a that swings integrally is provided.
Is provided with a second lift cylinder 38 for operating the.

As shown in FIG. 5, the first arm 33 and the second
A channel-shaped support bracket 39 that opens forward is provided at the distal end position of each of the arms 34 so as to be rotatable around a rolling axis Y in a front-rear direction.
The center position of the main frame 40 above the reel mower 6 in the left-right direction is supported rotatably around the yawing axis Z in the vertical position. In addition, 45 is a case main body, 46 is a guide member, 46a is a discharge port, 49 is a ground roller, and 51 is a hydraulic motor.

As shown in FIGS. 3 and 4, at the front end position of the traveling body, a frame member 41 having a shape which is upwardly directed toward the outer end in the left-right direction is provided. Cushion 4 made of an elastic material such as rubber or rubber
2, 42 are supported in a front-rear posture via a bending stay 42a. And three reel mowers 6,6
6 to be raised, the first lift cylinder 35, the second
The lift cylinders 38, 38 are respectively driven to extend simultaneously. When the lift cylinders 38, 38 rise, as shown in FIG. 4, the contact rollers 42, 42 contact the main frames 40 of the reel mowers 6, 6 at the left and right positions. By rotating each reel mower 6, 6, 6 around the rolling axis Y, Y
The outer end side is switched to an inclined posture that is directed upward.

Next, a support structure for the front wheel 1 will be described. As shown in FIG. 8, the front wheel 1 is bolted to a hub 9a fixed to an end of a front axle 9 extending left and right from a differential mechanism 10 in the front transmission case M,
Each front axle 9, 9 is rotatably supported by an axle case 18 and an extension case 27. The front mission case M is
Front axle case 1 on the left and right of the left and right center differential case section 31
8, 18 are bolted. Further, a tread variable mechanism A capable of changing the tread of the front wheels 1, 1 is provided.

That is, the variable tread mechanism A has an extended tread state in which the extension case 27 is attached to the end of the axle take-out portion of the axle case 18 (state in FIG. 8) and a standard tread state in which the extension case 27 is not attached (FIG. 9). ), And in the expanded tread state, the reinforcing member 43 is connected to extend over the extension case 27 and the base side portion of the axle case 18.

The reinforcing member 43 has a first member 44 connected to the axle case 18 and a second member 44 connected to the extension case 27.
It has a divided structure comprising a member 47 and two bolts (an example of fixing means) 48, 48 for connecting and integrating the two members 44, 47. That is, as shown in FIG. 10, the first member 44 includes a pair of tongue pieces 44b,
44b, and the flange portion 1 of the axle case 18
At the lower part of 8a, it is fixed together by a fixing bolt 50 to the differential case. The second member 47 is formed by bending a steel strip in a U-shape, and the flange portion 2 of the extension case 27 is formed.
7a, and these two members 44,
47 is connected and integrated by screwing a welding nut 52 provided on the tongue piece 44b and a connecting bolt 48.

The hole for inserting the connecting bolt 48 in the second member 47 is a stupid hole slightly larger than the bolt diameter. First, the first and second members 44 and 47 are connected to the respective cases 18 and 27 individually. After that, the connecting bolt 48 is tightened, so that the reinforcing member 43 has an appropriate length suitable for the actual size. Also, the reinforcing member 43
Is disposed below the front axle 9, so that the reinforcing member is set to a state in which a tensile force mainly acts, and can be constituted by an inexpensive member that does not need to take much measures against buckling such as a plate material. I have.

As shown in FIG. 9, when the blade type mower 53 is mounted instead of the reel mower 6, the extension case 27 is removed and the front axle 54 shorter than the front axle 9 of the reel mower type is replaced. is there.
Of course, the reinforcing member 43 is also removed, and the oil seal 55 is removed.
At the outer end of the front axle case 18. As a result, the front axle case 18, ie, the front transmission case M
Can be used in both the reel mower specification with a wide tread Dh of the front wheel 1 shown in FIG. 5 and the blade mower specification with a narrow tread Ds of the front wheel 1 shown in FIG.

[Other Embodiment] In a tractor to which a working device B can be connected to the rear of the machine, the variable tread mechanism A of the present invention may be applied to a non-steering drive type rear wheel support structure. The working device B may be a device other than the mowers 6 and 53, such as a sprayer and a tilling device.

[Brief description of the drawings]

FIG. 1 is an overall side view of a lawn mower equipped with a reel mower.

FIG. 2 is a side view of a grass collection container in a discharging position.

FIG. 3 is a front view of the lawn mower of FIG. 1;

FIG. 4 is a front view of a state where a reel mower is raised.

FIG. 5 is a schematic plan view of the lawn mower of FIG. 1;

FIG. 6 is a side view of a lifting / lowering structure of a first arm.

FIG. 7 is a side view of the lifting structure of the second arm.

FIG. 8 is a sectional view showing a front wheel support structure in a reel mower specification.

FIG. 9 is a sectional view showing a front wheel support structure in a blade mower specification.

FIG. 10 is an exploded perspective view showing a front wheel case, a reinforcing member, and the like.

FIG. 11 is a schematic plan view of a lawnmower equipped with a blade mower.

[Description of Signs] 1 front wheel 2 rear wheel 18 front axle case 27 extension case 43 reinforcing member 44 first member 47 second member A tread changing mechanism B working device

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yoshiyuki Ezaki 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works (72) Inventor Koji Fujiwara 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. Office (72) Inventor Matsuo Tachibana 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Junichi Kitamura 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Yoshikazu Togoshi 64, Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (2)

[Claims] A working device is connected in front of or behind a fuselage, and a wheel of the front and rear wheels on which the working device is connected is configured as a non-steering wheel. A tread variable mechanism capable of changing a tread is provided, and the tread variable mechanism is capable of displaying an extended tread state in which an extension case is attached to an end of an axle take-out portion of an axle case, and a standard tread state in which the extension case is not attached. In the expanded tread state, a reinforcing member is erected and connected over the extension case and a base side portion of the axle case, and the reinforcing member is disposed in a state where a tensile force acts on the reinforcing member. Wheel support structure for working machine. 2. A structure in which the reinforcing member is divided into a first member connected to the axle case, a second member connected to the extension case, and fixing means for connecting and integrating these two members. The wheel support structure for a working machine according to claim 1, wherein