JP2011201353A - Seat mounting structure for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat mounting structure for a working vehicle which reduces vibration transmitted to a seat and makes it easy to maintain the seat at a proper position.SOLUTION: The seat 12 is structured to be collapsible forward by connecting rotatably a seat 12 and support members 22, 42 that support the seat 12. Elastic members 23 are provided over the seat 12 and the support members 22, 42. Right and left vibration control members 63 are disposed between first members 61 fixed on a transmission case 8 and second members 62 that support the support members 22, 42 to restrict transverse movement of a predetermined amount or more by making first contact surfaces 76 of the first members 61 and second contact surfaces 75 of the second members 62 contact each other.

Description

  The present invention relates to a seat mounting structure for a work vehicle for reducing vibration transmitted to the seat.

  Conventionally, in this type of work vehicle seat mounting structure, the front side portion of the seat and the front side portion of the front / rear slide mechanism attached to the vehicle body frame can be pivotally connected around the horizontal axis so that the seat can be moved forward. In addition to the above, there is a configuration in which an elastic member (a metal spring, an anti-vibration rubber, or the like) is provided across the rear side portion of the seat and the rear side portion of the front / rear slide mechanism (for example, see Patent Document 1).

JP 2010-13000 A

  For example, in order to further absorb vibration transmitted to the sheet, the vibration-isolating rubber is increased to increase the vibration-absorbing capacity of the vibration-isolating rubber, or the elastic constant of the metal spring is decreased to increase the vibration-absorbing capacity of the metal spring. Sometimes. However, when the vibration isolating rubber is increased or the elastic constant of the metal spring is decreased in this way, the deformation amount of the vibration isolating rubber or the metal spring is increased, and the position of the seat is easily deviated from the proper position.

  An object of the present invention is to provide a seat mounting structure for a work vehicle that can easily maintain a seat position at an appropriate position while reducing vibrations transmitted to the seat.

The work vehicle seat mounting structure of the present invention is configured such that the front side portion of the seat and the front side portion of the support member that supports the seat are rotatably connected around the horizontal axis so that the seat can be moved forward. An elastic member is provided across the rear side of the sheet and the rear side of the support member,
The first characteristic configuration is that left and right vibration isolation members are interposed between a first member fixed to a mission case and a second member that supports the support member, and the first member is a longitudinal member along the front-rear direction. Left and right first contact surfaces are provided, and the second member includes left and right second contact surfaces that are vertically disposed along the front-rear direction and are disposed close to the left and right first contact surfaces. The lateral movement of the first member with respect to the first member by a predetermined amount or more is restricted by contacting the first contact surface of the first member with the second contact surface of the second member. It is in a certain point.

  According to this configuration, in addition to the elastic member provided across the rear side portion of the seat and the rear side portion of the support member, the first member fixed to the transmission case and the second member that supports the support member The vibration transmitted to the sheet can be sufficiently absorbed by the left and right vibration isolation members provided therebetween.

  In general, a work vehicle often turns during work, and therefore rolls associated with turning increase. Therefore, the lateral movement of the second member by a predetermined amount or more with respect to the first member is restricted by the contact between the first contact surface of the first member and the second contact surface of the second member. As a result, the position of the sheet is less likely to deviate laterally from the appropriate position, and the position of the sheet is easily maintained at the appropriate position.

  According to a second characteristic configuration of the present invention, the first member includes left and right L-shaped first abutting portions when viewed in the front-rear direction, and the second member has a second projecting shape having a downwardly convex shape when viewed in the front-rear direction. The left and right vibration isolation members are interposed between a lateral surface of the left and right first abutting portions and a lower surface of the left and right second abutting portions. The vertical surface of the portion is configured as the first contact surface, and the vertical surfaces of the left and right second contact portions are configured as the second contact surface.

  According to this configuration, the left and right vibration isolation members are sandwiched between the lateral surface of the L-shaped first contact portion and the lower surface of the downward convex second contact portion, and the L-shaped first contact portion. The lateral movement of the second member with respect to the first member by a predetermined amount or more is restricted by the contact between the vertical surface of the second member and the vertical surface of the second convex contact portion.

  The first and second contact portions have a function of regulating the lateral movement of the second member relative to the first member, in addition to the function of sandwiching and supporting the left and right vibration isolation members. For this reason, for example, it is possible to simplify the configuration such that it is not necessary to separately include a member that sandwiches and supports the left and right vibration isolation members and a regulating member that regulates the lateral movement of the second member relative to the first member.

It is a side view which shows a tractor. It is a side view which shows a sheet | seat attachment structure. It is a front view which shows a sheet | seat attachment structure. It is a side view which shows a sheet | seat attachment structure. It is a front view which shows a sheet | seat attachment structure. It is a disassembled perspective view which shows a sheet | seat attachment structure. It is a front view which shows the sheet | seat attachment structure in another embodiment.

  Hereinafter, a configuration in which the seat mounting structure of the present invention is applied to a tractor as an example of a work vehicle will be described.

〔overall structure〕
As shown in FIG. 1, the tractor is mounted on a self-propelled vehicle body that is self-propelled by left and right front wheels 1 that can be steered and driven, and on the rear part of the self-propelled vehicle body. And a lops frame 4 and a link mechanism 5. The self-propelled vehicle body includes a front driving unit 6, a driving unit 7 installed in the middle, and a mission case 8 installed in the rear.

(Moving part)
As shown in FIG. 1, the prime mover 6 includes an engine 9, an engine bonnet 10 covering the engine 9, and a fuel tank 11 provided at the rear of the engine bonnet 10. The front wheel 1 is supported by the connected frame 3.

(Link mechanism)
As shown in FIGS. 1 and 2, the link mechanism 5 includes left and right lift arms 5 a provided on both sides of the upper side of the mission case 8 so as to be able to swing up and down, and on both sides of the lower side of the mission case 8. The left and right lower links 5b provided movably, the left and right lift rods 5c for connecting the left and right lift arms 5a and the left and right lower links 5b, respectively, and the upper part of the transmission case 8 are integrated obliquely upward along the upper front. And a lifting cylinder case 5d that houses a lifting cylinder CY that swings up and down the left and right lift arms 5a.

(Operation part)
As shown in FIG. 1, the driving unit 7 has a seat 12 disposed in the upper center of a mission case 8 located between the left and right rear wheel fenders 15, and a steering wheel 13 and a driving panel 14 in front of the seat 12. It is configured with.

[Sheet mounting structure]
As shown in FIGS. 1 to 6, a cushion mechanism KK, a front / rear slide mechanism ZK (an example of a slide mechanism), and vibration transmitted to the seat 12 are provided between the seat 12 and the transmission case 8 as a seat mounting structure. A vibration absorbing mechanism SK for absorbing is provided.

(Cushion mechanism)
The cushion mechanism KK imparts cushioning properties to the seat 12, and includes left and right seat attachment members 21 attached to the front side portion of the seat 12, and left and right guided members 42 (an example of a support member) described later. A seat support member 22 (an example of a support member) that is attached to the front side portion of the seat and supports the left and right seat attachment members 21 so as to be rotatable around the horizontal axis X, and the rear side portion of the seat 12 and the left and right guided members. 42 and left and right large-diameter springs 23 (an example of an elastic member) interposed between the rear side portions of 42.

  When the driver sits on the seat 12, the left and right large-diameter springs 23 are compressed. Thereby, cushioning properties can be imparted to the seat 12. Further, when the upper part of the sheet 12 is pushed forward, the sheet 12 rotates around the horizontal axis X. Thereby, the sheet | seat 12 can also be brought forward. Therefore, maintenance work can be easily performed.

  The left and right seat attachment members 21 include an attachment portion 21a and a shaft support portion 21b, and the cross-sectional shape is configured in an L shape. A metal sheet placement member 12b is attached to the lower surface of the cushion portion 12a of the seat 12, and an attachment portion 21a of the sheet attachment member 21 is connected to the lower surface of the sheet placement member 12b.

  The sheet support member 22 includes a flat plate portion 22a and left and right bent portions 22b extending upward from both end portions of the flat plate portion 22a, and has a U-shaped cross section. A shaft support portion 21b of the left seat mounting member 21 and a left bent portion 22b of the seat support member 22 are coupled to be rotatable about the horizontal axis X. The shaft support portion 21b of the right seat mounting member 21, the right bent portion 22b of the seat support member 22, and the stay 24 are coupled to be rotatable about the horizontal axis X. The front side portions of the left and right guided members 42 are connected to the lower surface of the flat plate portion 22 a of the sheet support member 22. A notch 22c into which the tool box TB enters is formed at the rear end of the flat plate portion 22a of the sheet support member 22.

  The stay 24 includes a stay main body 24a extending in the front-rear direction, a flat plate-shaped first bent portion 24b protruding rightward from an intermediate portion of the stay main body 24a, and a tongue piece protruding leftward from the intermediate portion of the stay main body 24a. Second bent portion 24c, a flat plate-like third bent portion 24d protruding leftward from the rear side portion of the stay body 24a, and a fourth fold extending downward from the rear end portion of the third bent portion 24d. A bent portion 24e and a tongue-like fifth bent portion 24f extending downward from the rear end portion of the fourth bent portion 24e are provided. A contact member 82 that contacts the lower surface of the cushion portion 12a of the seat 12 is attached to the upper surface of the fourth bent portion 24e.

  A seating detection switch SW for detecting that the driver is seated is attached to the first bent portion 24b. A small-diameter spring 25 is connected to the upper surface of the third bent portion 24d.

  A cutout 22d is formed at the rear end of the right bent portion 22b of the sheet support member 22, and a second bent portion 24c is inserted into the cutout 22d. When the driver leaves the seat 12, the small-diameter spring 25 extends to lift the seat 12. Thus, when the driver leaves the seat 12, the seating detection switch SW can be surely turned off to accurately detect the driver's seating state. Note that when the seating detection switch SW is turned off, the engine 9 is automatically stopped. Further, when the seat 12 is moved forward, the second bent portion 24 c of the stay 24 abuts on the upper side portion of the notch 22 d of the sheet support member 22, thereby preventing further rotation of the stay 24. Thereby, it is possible to prevent the stay 24 from rotating together with the seat 12 when the seat 12 is moved forward.

  A cap 83 is attached to the upper portion of the small-diameter spring 25. Left and right large-diameter springs 23 are connected to the upper surfaces of the rear side portions of the left and right guided members 42. A cap 83 is attached to the upper part of the left large-diameter spring 23. The upper portion of the right large-diameter spring 23 engages with the fifth bent portion 24f while being in contact with the lower surface of the fourth bent portion 24e. When the forwardly moved sheet 12 is returned to the original position, the right side portion of the intermediate portion in the front-rear direction of the sheet placing member 12b comes into contact with the cap 83 attached to the upper portion of the small-diameter spring 25. Further, the rear side portion of the sheet placing member 12b comes into contact with the cap 83 attached to the upper portion of the left large-diameter spring 23 and contacts the contact member 82 attached to the upper surface of the fourth bent portion 24e. Touch. Thereby, it can prevent that the sheet | seat placement member 12b of the sheet | seat 12 is damaged.

  A space 79 for accommodating the tool box TB is formed on the rear side of the sheet support member 22 below the sheet placement member 12 b of the sheet 12. The tool box TB is placed and supported by the flat plate portion 72 of the second member 62 on the front side and the rear side, respectively, with the front end side lower portion being inserted into the notch 22d of the sheet support member 22. It is connected with bolts. As a result, the prismatic tool box TB that is long in the front-rear direction can be accommodated using the space 79 effectively. Further, the tool box TB can be easily taken out by rotating the sheet 12 around the horizontal axis X and moving it forward.

(Previous slide mechanism)
The front / rear slide mechanism ZK slides the seat 12 in the front-rear direction with respect to the transmission case 8, and includes a slide adjustment lever 41 that can be swung laterally and left and right guided members that support the seat 12. 42 and left and right guide members 43 for guiding the guided members 42.

  The left and right guided members 42 include a flat plate portion 42a, left and right bent portions 42b extending downward from both ends of the flat plate portion 42a, and inward from the respective end portions of the left and right bent portions 42b. And left and right curved portions 42c. The curved portion 42c of the right guided member 42 is provided with a plurality of engagement holes (not shown) along the front-rear direction.

  The left and right guide members 43 extend outward from respective ends of the flat plate portion 43a, left and right bent portions 43b extending upward from both ends of the flat plate portion 43a, and the left and right bent portions 43b. Left and right collar portions 43c. The flange portions 43c of the left and right guide members 43 support the flat plate portions 42a of the left and right guided members 42 so as to be slidable back and forth. A side surface of the bent portion 43b contacts the curved portion 42c. The bent portion 43b of the right guide member 43 is provided with a plurality of engagement holes 43d along the front-rear direction.

  A lever support member 44 is attached to the slide adjustment lever 41. The lever support member 44 is connected to the right guided member 42 so as to be rotatable around the vertical axis. The lever support member 44 includes a hook portion 44a that engages with the engagement hole of the bending portion 42c and the engagement hole 43d of the bent portion 43b. A spring 81 is provided across the hook portion 44a and the guided member 42 on one side.

  When the slide adjustment lever 41 is swung in the laterally inward direction, the lever support member 44 rotates in one direction against the urging force of the spring 81, and the engagement hole and the bent portion of the hook portion 44a and the bending portion 42c are bent. The engagement with the engagement hole 43d of 43b is released. Thereby, the sheet | seat 12 can be slid back and forth.

  When the hand is released from the slide adjustment lever 41, the lever support member 44 is rotated in the other direction by the biasing force of the spring 81, and the engagement hole 43d of the hook portion 44a and the bending portion 42c and the engagement hole 43d of the bent portion 43b Engage. Thereby, the seat 12 can be fixed at a desired position in the front-rear direction.

(Vibration absorption mechanism)
The vibration absorbing mechanism SK absorbs vibration transmitted to the seat 12, and includes front and rear first members 61 fixed to the mission case 8 and front and rear sides that support the left and right guide members 43. Left and right vibration isolations provided between the second member 62, the front first member 61 and the front second member 62, and between the rear first member 61 and the rear second member 62. Rubber 63 (an example of a vibration isolating member).

(First member)
In the elevating cylinder case 5d of the mission case 8, a shut-off valve (not shown) for operating the operating oil in the elevating cylinder CY is provided. A rotation lever 64 that rotates the cutoff valve extends forward from the cutoff valve through the elevating cylinder case 5d. The elevating cylinder case 5d is formed with a cylindrical portion 82 surrounding the root portion of the rotation operation lever portion 64.

  As shown in FIGS. 3 and 4, the first member 61 on the front side includes a lower flat plate portion 65 attached to the upper portion of the tubular portion 82 and a front end portion of the lower flat plate portion 65 upward. A bent portion 66 extending; an upper flat plate portion 67 extending forward from the upper end portion of the bent portion 66; and first left and right contact portions 69 fixed to a central portion of the upper flat plate portion 67. It is configured in a long shape along the horizontal direction. Left and right attachment portions 68 are provided across the bent portion 66 and the upper flat plate portion 67. The left and right attachment portions 68 are connected to the left and right rear wheel fenders 15.

  The left and right first contact portions 69 include a side wall portion 69a extending downward from the central portion of the upper flat plate portion 67, and a bottom wall portion 69b extending outward from the lower end portion of the side wall portion 69a. It is comprised in the substantially L shape by the front-back direction view.

  As shown in FIGS. 2 to 4, left and right downward stays 70 are located on the inner side of the left and right first abutting portions 69 at the center of the flat plate portion 67 on the upper side of the first member 61 on the front side. It is fixed in the state. A forward stay 71 is attached to the upper part of the mission case 8. A forward stay 71 and left and right downward stays 70 are connected.

  The rear first member 61 has substantially the same configuration as the front first member 61, but differs from the front first member 61 in that the left and right downward stays 70 are not fixed. The lower flat plate portion 65 of the rear first member 61 is attached to an intermediate portion of the elevating cylinder case 5 d of the transmission case 8.

(Second member)
The second member 62 on the front side is formed into a single plate shape by bending, and the upper flat plate portion 72 and the left and right downward convex second portions provided at both ends of the upper flat plate portion 72 are formed. 2 abutment portions 73 and left and right guide member support portions 74 extending outward from the left and right second abutment portions 73 so as to connect and support the front end portions of the left and right guide members 43. It is configured. The flat plate portion 72 and the left and right guide member support portions 74 are formed so that the height of the upper surface of the flat plate portion 72 is higher than the height of the upper surface of the left and right guide member support portions 74.

  The left and right second contact portions 73 extend downward from a first side wall portion 73a extending downward from an outer end portion of the upper flat plate portion 72 and an inner end portion of the guide member support portion 74. A second side wall part 73b and a bottom wall part 73c that connects the first side wall part 73a and the second side wall part 73b are provided, and the upper side is opened in the front-rear direction and is formed in a substantially U shape.

  The left and right first contact portions 69 enter the space below the flat plate portion 72 on the inner side of the left and right second contact portions 73. The inner side surface 75 of the first side wall portion 73a of the left and right second abutting portions 73 (an example of a second abutting surface and a vertical surface) and the outer side surface 76 of the side wall portion 69a of the left and right first abutting portions 69 (first An example of the contact surface and the vertical surface is close to each other. The distance d2 between the inner side surfaces 75 of the left and right second contact portions 73 is set slightly larger than the distance d1 between the outer side surfaces 76 of the left and right first contact portions 69.

  The second member 62 on the rear side has the same configuration as the second member 62 on the front side, and is configured to connect and support the rear ends of the left and right guide members 43.

(Anti-vibration member)
The lateral surfaces 77 of the bottom wall portions 69b of the left and right first contact portions 69 of the front and rear first members 61 and the left and right second contact portions 73 of the front and rear second members 62 are shown. Left and right anti-vibration rubbers 63 are provided between the lower surface 78 of the bottom wall portion 73c.

  The left and right anti-vibration rubbers 63 are formed in a cylindrical shape, and a through hole 63b is formed along the central axis. Annular ribs 63a projecting radially outward are formed on the upper and lower parts of the anti-vibration rubber 63, and a disk-shaped support plate made of sheet metal is fixed to the upper and lower sides thereof.

  With the vibration isolating rubber 63 sandwiched between the bottom wall portion 69b of the first contact portion 69 and the bottom wall portion 73c of the second contact portion 73, the bolt is connected to the bottom wall portion of the first contact portion 69. Fastening is performed in a state of passing through the round hole 69 b, the round hole in the bottom wall portion 73 c of the second contact portion 73, and the through hole 63 b of the vibration isolating rubber 63.

  As described above, in addition to the left and right large-diameter springs 23 provided across the rear side portion of the seat 12 and the rear side portion of the guided member 42, the first member 61 fixed to the transmission case 8 is first. The left and right anti-vibration rubbers 63 provided between the contact portion 69 and the second contact portion 73 of the second member 62 that supports the sheet support member 22 via the guided member 42 and the guide member 43 allow the sheet 12 to The vibration transmitted to can be sufficiently absorbed.

(Configuration to prevent rolling of the sheet)
As the tractor turns, a lateral centrifugal force acts on the seat 12 and the anti-vibration rubber 63 is deformed in the lateral direction. At this time, the second member 62 against the first member 61 is brought into contact with the outer surface 76 of the first contact portion 69 of the first member 61 and the inner surface 75 of the second contact portion 73 of the second member 62. The lateral movement of a predetermined amount ((d2-d1) / 2) or more is restricted.

  This makes it difficult for the position of the sheet 12 to deviate laterally from the appropriate position, prevents the vibration isolating rubber 63 from being bent more than necessary, and makes it easier to maintain the position of the sheet 12 at the appropriate position. Moreover, since the lateral movement of the second member 62 with respect to the first member 61 is less than a predetermined amount ((d2-d1) / 2), the vibration-proof rubber 63 is allowed to be slightly deformed in the lateral direction, and the vibration-proofing. It becomes easy to maintain the vibration absorption capability of the rubber 63.

[Another embodiment]
(1) In the above embodiment, as shown in FIG. 7, the left and right second contact portions 73 enter inside the left and right first contact portions 69, and the second left and right second contact portions 73 are second. The outer side surface 75 of the side wall portion 73b and the inner side surface 76 of the side wall portion 69a of the left and right first contact portions 69 may be close to each other and face each other.

(2) In the above-described embodiment, the configuration in which the elastic member is the large-diameter spring 23 is illustrated. However, the configuration is not limited to such a configuration. For example, the elastic member may be rubber or an air cushion member. .

(3) Instead of the configuration of FIG. 6, the upper portion of the right large-diameter spring 23 is connected to the lower surface of the fourth bent portion 24e, and the upper portion of the left large-diameter spring 23 is the rear of the sheet placing member 12b. It is good also as a structure connected with a side part.

  The present invention is not limited to a tractor and can be applied to a seat mounting structure for different work vehicles such as a riding rice transplanter, a combiner, and a riding lawn mower.

8 Mission case 12 Sheet 22, 42 Support member 23 Elastic member 61 First member 62 Second member 63 Left and right vibration isolation member 69 First left and right contact portion 73 Second left and right contact portion 75 Second contact surface, Vertical surface 76 First contact surface, vertical surface 77 Horizontal surface 78 Lower surface X Horizontal axis

Claims (2)

The front side portion of the sheet and the front side portion of the support member that supports the sheet are rotatably connected around the horizontal axis so that the sheet can be moved forward, and the rear side portion of the sheet and the support member A work vehicle seat mounting structure in which an elastic member is provided across the rear side part,
Left and right vibration isolation members are interposed between the first member fixed to the mission case and the second member supporting the support member,
The first member includes left and right first contact surfaces in the vertical direction along the front-rear direction,
The second member includes left and right second contact surfaces that are vertically disposed along the front-rear direction and are disposed close to the left and right first contact surfaces,
A work vehicle seat mounting structure configured to restrict lateral movement of the second member with respect to the first member by a predetermined amount or more by contacting the first contact surface and the second contact surface. .   The first member includes left and right L-shaped first abutting portions when viewed in the front-rear direction, and the second member includes left and right convex second abutting portions when viewed from the front and rear. The left and right vibration isolation members are interposed between the lateral surface of the first contact portion and the lower surfaces of the left and right second contact portions, and the vertical surfaces of the left and right first contact portions are 2. The work vehicle seat mounting structure according to claim 1, wherein the working surface is configured as a contact surface, and a vertical surface of the left and right second contact portions is configured as the second contact surface.

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