JP2015192619A - Balance weight for walk-behind working machine and walk-behind working machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively function a balance weight by contriving the shape and mounting of the balance weight.SOLUTION: A walk-behind working machine includes a mounting object part 9C to which a mounting base 12A provided in a balance weight 12 is demountably mounted, at a front lower side of a machine body frame 1. In a balance weight mounted state where the mounting base 12A is mounted on the mounting object part 9C, an extension part 12B of the balance weight 12 is positioned at a machine body front side with respect to a front end of the machine frame 1.

Description

  The present invention relates to a walk-type work machine including a balance weight for a walk-type work machine and a mounted part to which a mounting base provided thereto is detachably connected.

  As a balance weight for a walking type work machine, it is common to form a rectangular cube in a plan view. And there exists what was comprised so that it might be piled up and attached to the hitch with which the front end part of the engine mounting frame in a walk type work machine was attached via the connecting pin of the up-down direction which can be inserted or removed with respect to a hitch (for example, refer patent document 1). ).

JP-A-8-276765 (paragraph number 0019, FIGS. 1 and 6)

  In the above configuration, since the shape of the balance weight is a rectangular cube in plan view, in order to stabilize the weight balance with the tilling rotor and the like installed at the rear of the aircraft without increasing the overall length of the aircraft, the vertical direction As a result, the balance weight becomes bulky and the overall weight of the balance weight becomes heavy.

  Also, by providing a hitch at the front part of the engine mounting frame, the extension length of the aircraft from the wheel increases, and by attaching a balance weight to the hitch, the extension length of the aircraft from the wheel to the front is increased. It gets even longer. Therefore, when the ground work device such as a tilling rotor at the rear of the airframe is lifted with the wheel as a fulcrum and the airframe is turned, the balance weight easily comes into contact with the ground, which makes it difficult to lift the ground work device. It is difficult to turn the aircraft.

  An object of the present invention is to make the balance weight function effectively by devising the shape and attachment of the balance weight.

The problem solving means of the present invention is:
In the balance weight for walking type work machines,
An attachment base that is long in the front-rear direction and an extension that extends upward from the front end portion of the attachment base are provided.

  According to this means, when the balance weight is attached to the walking work machine, the balance weight is attached so that the extension part of the balance weight is farthest from the ground work device such as a tilling rotor provided at the front and rear ends of the machine body. If set, the extension portion of the balance weight is positioned in an upward posture in which the position of the center of gravity is high at the position farthest from the ground work device in the walking type work machine.

  That is, the extension portion of the balance weight can be positioned in a suitable posture at a suitable position as a balancer with respect to the ground work device.

  As a result, it is possible to effectively exert the function as a balancer for the ground work device while reducing the overall weight of the balance weight as compared with the case where the balance weight is simply formed in a cubic shape.

As one of the means for making the present invention more suitable,
In the walking type work machine provided with the attached part to which the mounting base part provided in the balance weight for the walking type work machine according to claim 1 is detachably attached,
The attached portion is provided at the front lower part of the body frame,
In the balance weight mounting state in which the attachment base is attached to the attached portion, the extension portion of the balance weight is configured to be positioned on the front side of the body from the front end of the body frame.

  According to this means, when the balance weight is mounted, the balance weight mounting base is located at the front lower part of the fuselage frame, and the balance weight extension is from the front end of the fuselage frame farthest from the ground work device at the rear of the fuselage. Also, it is positioned in an upward posture that raises the center of gravity at the position on the front side of the aircraft.

  In other words, it is possible to use the upper side of the body frame as a mounting part such as an engine without waste, and the posture is suitable for a suitable position as a balancer with respect to the ground work device without providing a balance weight. Can be deployed.

  Thereby, it is possible to easily perform the floating operation of the ground work device with the wheel as a fulcrum, which is performed when the aircraft is turned, while reducing the overall weight of the balance weight. In addition, compared with the case where a hitch is provided at the front end of the body frame, the extension length of the body from the wheel to the front can be shortened, and the balance weight is reduced when the ground work device is lifted accordingly. Since it becomes difficult to come into contact with the ground, the ground work device can be easily lifted and the turning operation of the airframe can be easily performed.

  If the ground work device side of the aircraft is lifted too much when performing the turning operation of the aircraft, the balance weight extension will contact the ground, etc. Can be suppressed.

  Therefore, while using the upper side of the machine frame as a mounting part such as an engine without waste, and while reducing the weight of the balance weight, the function as a balancer for the ground work device can be effectively exhibited. The turnability of the airframe can be improved.

As one of the means for making the present invention more suitable,
A protective member extending forward and upward from the front end of the body frame;
In the balance weight mounting state, the extension portion of the balance weight is configured to overlap the protection member in a side view.

  According to this means, the protective member can be provided while avoiding an increase in the extension length of the airframe forward from the wheel. If the ground work device side of the aircraft is lifted too much during the turning operation of the aircraft, the protective member comes into contact with the ground etc. together with the extension part of the balance weight. Sticking and the like can be more effectively suppressed.

  Accordingly, it is possible to more effectively suppress damage to the airframe without impairing the turning performance of the airframe.

As one of the means for making the present invention more suitable,
The protective member includes an upwardly extending portion having an inverted U shape in front view,
In the balance weight mounting state, the extension portion of the balance weight is located in a space portion of the upward extension portion.

  According to this means, the balance weight can be attached to the walking work machine in a state in which the extension portion is housed in the space portion of the upward extension portion of the protective member.

  Thereby, compared with the structure from which a balance weight protrudes right and left from the upward extension part of a protection member, size reduction of a walk type working machine can be achieved.

As one of the means for making the present invention more suitable,
In the state where the balance weight is mounted, the lower portion of the extension portion of the balance weight is configured to be positioned on the lower front side of the body relative to the front edge of the protection member.

  According to this means, if the ground work device side of the airframe is lifted too much when performing the turning operation of the airframe, the balance weight is generally made of a casting that is stronger than the protective member made of steel. The lower part of the protruding part can be brought into contact with the ground or the like.

  As a result, it is possible to more effectively suppress damage to the airframe caused by the contact, and it is also possible to suppress damage to the protective member.

As one of the means for making the present invention more suitable,
The body frame includes a receiving portion that receives a rear end portion on the rear side of a connection portion with the body frame in the attachment base portion in a state where the attachment base portion is attached.

  According to this means, the balance weight is provided with an extending portion in a portion on the front side of the connection portion with the body frame, so that the front portion thereof is heavy. For this reason, in the state of being attached to the fuselage frame, the front portion of the balance weight tends to be lowered and the front portion tends to be raised with the connection portion with the fuselage frame as a boundary.

  By utilizing this point, the airframe is provided with a receiving portion for receiving the rear end portion of the mounting base, so that the rear end portion of the mounting base is received by the weight of the balance weight. The balance weight can be attached to the fuselage frame in a stable state close to the part.

As one of the means for making the present invention more suitable,
The attached portion includes a first connected portion to which a rear portion side of the attachment base portion is connected via a bolt facing left and right, and a second connected portion to which the front portion side of the attachment base portion is connected via a bolt facing upward and downward. And a part.

  According to this means, the balance weight can be securely attached to the body frame by two types of bolts having different fastening directions.

It is a left view of a walk type work machine. It is a top view of a walk type work machine. It is a front view of the principal part which shows the attachment structure of a balance weight. It is a disassembled perspective view of the principal part which shows the attachment structure of a balance weight. It is the vertical left side view of the principal part which shows the attachment structure of a balance weight. It is a partial cross-sectional top view of the principal part which shows the attachment structure of a balance weight. It is a partial cross-sectional top view of the principal part which shows the attachment structure of the balance weight in another embodiment [6]. It is a vertical left view of the principal part which shows the attachment structure of the balance weight in another embodiment [7]. It is a disassembled perspective view of the principal part which shows the attachment structure of the balance weight in another embodiment [7].

  Hereinafter, an embodiment in which a balance weight according to the present invention is applied to a walking tiller that is an example of a walking work machine will be described with reference to the drawings as an example of a form for carrying out the present invention.

  As shown in FIGS. 1 and 2, the walking type tiller exemplified in this embodiment includes a recoil starter type engine 2 mounted on the front part of the body frame 1, and a belt tension type arranged adjacent to the left side part of the engine 2. Main clutch 3, fuel tank 4 disposed at the upper rear of engine 2, substantially looped steering handle 5 extending rearward and upward from body frame 1, left and right drive wheels 6 provided at the front lower part of body frame 1, And, it is constituted by a tilling rotary 7 installed in the rear lower part of the body frame 1.

  The machine body frame 1 includes a transmission case 8 that also serves as a frame, an engine support member 9 that extends from the front lower part of the transmission case 8 to the front of the machine body in a horizontal posture, and a handle that extends rearward and upward from the front and rear intermediate parts of the transmission case 8. The support member 10 is configured.

  As shown in FIGS. 1 and 3 to 6, the engine support member 9 is made of sheet metal and is press-formed into a reverse U-shape in front view having a horizontal engine mounting portion 9 </ b> A and left and right side wall portions 9 </ b> B. . And the protection member 11 for engines extended from the front-end part to the front upper direction is provided.

  The protection member 11 is made of a round steel pipe, and is bent into a substantially L shape in a side view having an upwardly extending portion 11A having an inverted U shape in front view and left and right end portions 11B in front and rear directions. The left and right end portions 11B are welded to the outer surfaces of the front end portions of the corresponding side wall portions 9B of the engine support member 9.

  As shown in FIGS. 1-6, the walk-type tiller equips the balance weight 12 with respect to the tilling rotary 7 so that attachment or detachment is possible. The balance weight 12 is made of a casting, and is formed in a substantially L shape in a side view including an attachment base portion 12A that is long in the front-rear direction and an extension portion 12B that extends upward from the front end portion of the attachment base portion 12A. The attachment base 12A includes a first connection portion 12Aa that enables bolt connection with the rear side of the engine support member 9 on the rear side. Further, a second connection portion 12Ab that enables bolt connection to the front side of the engine support member 9 is provided on the front side. The first connecting portion 12Aa is a total of two left and right screw holes (hereinafter referred to as lateral screw holes) formed on the left and right sides of the mounting base 12A. The second connecting portion 12Ab is a single through-hole for bolt insertion (hereinafter referred to as a vertically-oriented through hole) formed vertically.

  The engine support member 9 includes a mounted portion 9C to which a mounting base portion 12A of the balance weight 12 is detachably attached at a front lower portion thereof. 9 C of to-be-attached parts and 1st to-be-connected part 9Ca with which the 1st connection part 12Aa (rear part side) of attachment base 12A is connected via the bolt 13 (henceforth a horizontal bolt 13) facing right and left, and up-down direction And a second connected portion 9Cb to which the second connecting portion 12Ab (front side) of the mounting base portion 12A is connected via a bolt 14 (hereinafter referred to as a vertical bolt 14). The first connected portion 9Ca is a single left and right through hole (hereinafter referred to as a horizontal through hole) for bolt insertion formed in the left and right side wall portions 9B of the engine support member 9. The second connected portion 9Cb is the above-described vertical bolt 14 welded to the bottom surface of the engine mounting portion 9A in the engine support member 9 in a hanging posture.

  Further, the engine support member 9 has a rear end portion 12Ac on the rear side of each of the connecting portions 12Aa and 12Ab with the mounted portion 9C in the mounting base portion 12A in a state where the mounting base portion 12A is mounted on the mounted portion 9C. A receiving portion 9D for receiving is provided.

  When the balance weight 12 is attached to the fuselage frame 1 with the above configuration, first, the balance weight 12 is set to the front-and-back orientation in which the extension portion 12B is located on the front side of the fuselage, and then the attachment base portion 12A is the engine support member. The balance weight 12 is aligned with the engine support member 9 so as to be positioned between the left and right side wall portions 9B.

  After that, while positioning the vertical bolt 14 (second connected portion 9Cb) of the engine support member 9 and the vertical through hole (second connection portion 12Ab) of the balance weight 12, the engine mounting on the engine support member 9 is performed. The balance weight 12 is lifted toward the bottom surface of the mounting portion 9A, and the vertical bolt 14 (second connected portion 9Cb) is inserted into the vertical through hole (second connection portion 12Ab) of the balance weight 12. Then, the nut 15 is screwed from the lower end of the vertical bolt 14 (second connected portion 9Cb), and the upper surface of the balance weight 12 is joined to the bottom surface of the engine mounting portion 9A. Thereby, the second connecting portion 12Ab of the balance weight 12 can be bolt-connected to the second connected portion 9Cb of the engine support member 9.

  By this connection, the balance weight 12 is placed in the front lower portion of the engine support member 9 in a stable state in which the rear end portion 12Ac of the attachment base 12A is in close contact with the receiving portion 9D of the engine support member 9 due to the weight of the extension portion 12B of the balance weight 12. Can be attached to.

  The left and right lateral through holes (first connected portion 9Ca) of the engine support member 9 and the left and right lateral screw holes (first connecting portion 12Aa) of the balance weight 12 are opposed to each other by the above connection. The horizontal bolts 13 are inserted into the left and right horizontal through holes (first connected portion 9Ca) and screwed into the left and right horizontal screw holes. Thereby, the first connecting portion 12Aa of the balance weight 12 can be bolt-connected to the first connected portion 9Ca of the engine support member 9.

  With this connection, the balance weight 12 can be securely and firmly attached to the front lower portion of the engine support member 9.

  And in the balance weight mounting state in which the mounting base 12A of the balance weight 12 is mounted on the mounted portion 9C of the engine support member 9 in this way, the extended portion 12B of the balance weight 12 overlaps the protective member 11 in a side view. Thus, the protective member 11 is configured to be positioned in the space portion 11a of the upward extending portion 11A.

  Further, the extension portion 12B of the balance weight 12 is positioned on the front side of the body from the front end of the engine support member 9, and the lower portion 12Ba of the extension portion 12B is on the lower side of the front side of the body than the front edge 11b of the protection member 11. It is comprised so that it may be located in.

  In other words, the balance weight 12 formed in a substantially L shape in a side view including the attachment base portion 12 </ b> A long in the front-rear direction and the extension portion 12 </ b> B extending upward is attached to the front lower portion of the engine support member 9. By attaching the base portion 12A between the left and right side wall portions 9B of the engine support member 9 and the extension portion 12B of the balance weight 12 within the space portion 11a of the upward extension portion 11A of the protection member 11, The front end of the engine support member 9 that is farthest from the tillage rotary 7 at the rear of the machine body, while allowing the upper side of the engine support member 9 to be used without waste as the mounting portion of the engine 2. It can be positioned in an upward posture that raises the center of gravity at a position on the front side of the aircraft.

  Thereby, the balance weight 12 can be deployed in a suitable posture as a balancer with respect to the tilling rotary 7 at the rear of the machine body in a suitable posture, and the balance weight 12 has a smaller overall weight than the protective member 11. It is possible to facilitate the floating operation of the tilling rotary 7 with the driving wheel 6 as a fulcrum, which is performed when the body is turned.

  Further, the extension length of the machine body forward from the drive wheel 6 can be shortened, and accordingly, when the tillage rotary 7 is lifted, the balance weight 12 becomes difficult to contact the ground. This makes it easier to lift the aircraft and makes it easier for the aircraft to turn.

  And, when the rotary rotary side of the airframe is lifted too much when performing the turning operation of the airframe, the lower portion 12Ba of the extended portion 12B in the sturdy balance weight 12 made of casting comes into contact with the ground, etc. It is possible to suppress damage to the aircraft due to the contact.

  As shown in FIGS. 3 and 5, the balance weight 12 is formed such that the extension length of the extension portion 12 </ b> B is shorter than the extension length of the upward extension portion 11 </ b> A in the protection member 11. . As a result, between the extension end of the extension portion 12B of the balance weight 12 and the extension end portion 11c of the upward extension portion 11A of the protection member 11, the extension end portion 11c is lifted by the walking type tiller. A gap is secured to enable use as a handle on the front side during conveyance.

  That is, the balance weight 12 can be attached to the rear part of the body without deteriorating the convenience of being able to use the extended end portion 11c of the upwardly extending portion 11A of the protective member 11 as a handle when lifting and transporting the walking type tiller. It can be deployed in a suitable state as a balancer for the tillage rotary 7.

  As shown in FIGS. 2 to 6, the balance weight 12 is attached to and detached from the oil discharge port 2 </ b> A of the engine 2, and the plug 16 screwed into the oil discharge port 2 </ b> A is attached and discharged from the oil discharge port 2 </ b> A. An opening 12C that enables oil to be taken out is formed. Accordingly, the engine oil can be easily replaced while the balance weight 12 is arranged in a suitable state as a balancer for the tillage rotary 7 at the rear of the machine body.

  [Another embodiment]

[1] The walking work machine may not include the protection member 11.

[2] The balance weight 12 may be formed such that the extension length of the extension portion 12B is longer than the extension length of the upward extension portion 11A of the protection member 11.

[3] The balance weight 12 may be formed so that the lateral width of the extension portion 12B is wider than the lateral width of the engine support member 9 or the lateral extension of the upward extension portion 11A of the protection member 11.

[4] The balance weight 12 may be formed so that the extension portion 12B has an opening that allows the upward extension portion 11A of the protection member 11 to pass therethrough. Moreover, you may form in the extension part 12B so that it may have the recessed part which accept | permits from the front-back direction of 11 A of upward extension parts in the protection member 11. FIG.

[5] The balance weight 12 may be formed so as not to include the opening 12 </ b> C that makes it possible to take out the waste oil from the oil drain port 2 </ b> A of the engine 2.

[6] As shown in FIG. 7, the first connecting portion 12Aa of the mounting base portion 12A is a left and right through-hole for bolt insertion extending on both the left and right sides of the mounting base portion 12A, and the first connecting portion of the mounting portion 9C. 9Ca is a left and right through hole for inserting a bolt formed in each of the left and right side wall portions 9B of the engine support member 9, and a bolt 17 inserted through the through hole and a nut 18 screwed into the bolt 17 are used. The first connecting portion 12Aa of the mounting base portion 12A and the first connected portion 9Ca of the mounted portion 9C may be connected.

[7] As shown in FIGS. 8 and 9, the second connecting portion 12Ab of the mounting base 12A is a vertical through hole for inserting a bolt, and the second connected portion 9Cb of the mounted portion 9C is an engine support member. 9, a nut welded to the bottom surface of the engine mounting portion 9 </ b> A, and a bolt 19 or the like that is inserted into a vertically extending through hole and screwed into the nut 19, so that the second connecting portion 12 </ b> Ab of the mounting base 12 </ b> A You may comprise so that 2nd to-be-connected part 9Cb may be connected.

[8] The engine support member 9 (airframe frame 1) of the balance weight 12 with the first connecting portion 12Aa of the mounting base 12A and the first connected portion 9Ca of the mounted portion 9C as the fulcrums of the bolts 13 and 17 facing left and right. ) May be configured to allow vertical swinging. In this configuration, the rear end portion 12Ac of the mounting base 12A is received by the engine support member 9 when the connection between the second connecting portion 12Ab of the mounting base 12A and the second connected portion 9Cb of the mounted portion 9C is released. You may comprise so that the balance weight 12 may be hold | maintained by a predetermined | prescribed lowering attitude | position by being received by the stop part 9D. Alternatively, the rear end portion 12Ac of the mounting base 12A may not be received by the receiving portion 9D of the engine support member 9, and the balance weight 12 may be in a suspended position.

[9] Vertically with respect to the engine support member 9 (airframe 1) of the balance weight 12 with the second connecting portion 12Ab of the mounting base 12A and the second connected portion 9Cb of the mounted portion 9C as fulcrums. You may comprise so that it may connect in the state which accept | permits rocking | fluctuation.

[10] The fuselage frame 1 is configured to have a backward-facing recess that allows the extension portion 12B of the balance weight 12 to be engaged from the front at the front end of the engine support member 9 (the fuselage frame 1). May be.

  The balance weight according to the present invention can be applied to a walking type tiller having a tillage rotary as a ground working device, a walking type rice transplanter having a seedling planting device as a ground working device, and the like.

DESCRIPTION OF SYMBOLS 1 Airframe frame 9C Attached part 9Ca 1st to-be-connected part 9Cb 2nd to-be-connected part 9D Receiving part 11 Protection member 11A Upward extension part 11a Space part 12 Balance weight 12A Mounting base 12Aa Connecting part (1st connecting part)
12Ab connecting part (second connecting part)
12Ac Rear end part 12B Extension part 12a Lower part 13 Bolt 14 Bolt

Claims (7)

  A balance weight for a walk-type work machine comprising an attachment base that is long in the front-rear direction and an extension that extends upward from a front end portion of the attachment base. In the walking type work machine provided with the attached part to which the mounting base part provided in the balance weight for the walking type work machine according to claim 1 is detachably attached,
The attached portion is provided at the front lower part of the body frame,
A walk-type work machine configured such that, in a balance weight mounting state in which the attachment base is attached to the attached part, the extension part of the balance weight is positioned on the front side of the machine body from the front end of the machine body frame. A protective member extending forward and upward from the front end of the body frame;
The walking work machine according to claim 2, wherein the extension portion of the balance weight is configured to overlap the protection member in a side view when the balance weight is attached. The protective member includes an upwardly extending portion having an inverted U shape in front view,
The walking work machine according to claim 3, wherein the extension portion of the balance weight is located in a space portion of the upward extension portion in the balance weight wearing state.   5. The walking according to claim 3, wherein in a state in which the balance weight is mounted, the lower portion of the extension portion of the balance weight is configured to be positioned on the lower front side of the body relative to the front edge of the protection member. Mold work machine.   The said body frame is provided with the receiving part which receives the rear-end part of a rear side rather than the connection part with the said body frame in the said attachment base in the state in which the said attachment base was attached. The walking type work machine as described in one.   The attached portion includes a first connected portion to which a rear portion side of the attachment base portion is connected via a bolt facing left and right, and a second connected portion to which the front portion side of the attachment base portion is connected via a bolt facing upward and downward. The walking type work machine according to any one of claims 2 to 6, further comprising a portion.

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