JP4753361B2 - Elevating link structure - Google Patents

Description

  The present invention relates to an elevating link structure for connecting a working machine such as a lawn mower so as to be movable up and down below a body frame in a working vehicle.

  As an elevating link structure for connecting a work machine to a lower part of a machine frame in a work vehicle so as to be able to move up and down, a base end portion can be rocked around the first rocking axis along the vehicle width direction from the conventional machine frame. A first link arm that is connected directly or indirectly, and a coaxial link with a second swing axis along the vehicle width direction at a position spaced apart from the first swing axis in the vehicle longitudinal direction. And a second link arm that is operatively connected to the free end side of the first link arm in a state in which a base end portion is supported by the pivot shaft. For example, see Patent Documents 1 and 2 below).

Lifting drive of the working machine via a pre SL lifting link structure, for example, by an actuator such as a hydraulic cylinder.
Therefore, a restriction member (stopper) is provided in order to prevent the lifting link structure and the work machine from rising too much and interfering with other members such as the machine body frame during the lifting operation of the work machine. Yes.
However, in the conventional lift link structure, apart from the configuration for connecting the work machine to the machine frame so as to be lifted and lowered, only a dedicated regulating member is provided, and the cost due to an increase in the number of parts High and workability deteriorated.
Japanese Utility Model Publication No. 63-143122 Japanese Patent No. 3254350

The present invention has been made in view to such prior art, a lift link structure for lifting coupling the working machine below the body frame in the working vehicle, the uppermost position of the working machine dedicated regulating member can regulations without providing, to provide a structural simple lifting link structure capable of realizing a much lower cost, and purpose.

The present invention, in order to solve the above problems, a lifting link structure for connecting the vertically movable work machine below the body frame in the working vehicle, proximal end in the width direction of the vehicle to the machine frame A first link arm coupled directly or indirectly so as to be swingable around the first swing axis along the second swing axis along the vehicle width direction at a position spaced from the first swing axis in the vehicle front-rear direction. A pivot shaft disposed so as to be coaxial with the movement axis, and a second link operatively connected to the free end side of the first link arm in a state where a base end portion is supported by the pivot shaft. The first link arm has an extending portion that extends beyond a connection point that is operatively connected to the second link arm, and the extending portion of the first link arm is By contacting the pivot shaft, the highest lift position of the working machine is regulated. To provide a lifting link structure, characterized in that is configured to.

  The lift link structure may further include an intermediate link arm that connects the first link arm and the second link arm.

In one form, the holding | maintenance member which has the superposition | polymerization area | region superposed | polymerized by the said body frame and the extension area | region extended below from this superposition | polymerization area | region can be further provided. In this case, the holding member is connected to the body frame via the overlapping region, and the pivot shaft is supported by the extending region.

According to engagement Ru temperature descending link structure to the present invention, the first link arm have an extension portion extending beyond the connection point is operatively connected to the second link arm, the first link arm Since the extended portion is configured to be in contact with the pivot shaft that supports the base end portion of the second link arm, the highest ascent position of the work implement is regulated. It can also be used as a member that regulates the highest position of the work implement. Therefore, it is possible to restrict the highest position of the working machine without providing a dedicated restricting member, thereby realizing a reduction in cost.

  And a holding member having a superposed region superposed on the airframe and an extending region extending downward from the superposed region, wherein the holding member is connected to the airframe through the superposed region, and In the case where the pivot shaft is supported by the extension region, for example, when the holding member is connected to the body frame so that the position of the pivot shaft can be adjusted, the mounting position of the pivot shaft with the body frame can be reduced. The degree of freedom of setting and adjustment can be improved. In addition, by changing the shape of the holding member and changing the mounting location, the position of the second swing axis can be changed as appropriate, so that it can be adapted to other frames regardless of the frame size or wheel size. Can be made easier.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of a working vehicle provided with a lifting link structure according to the present embodiment, and FIG. 2 is a plan view of the working vehicle.

As shown in FIGS. 1 and 2, the working vehicle A (the tractor in the present embodiment) is connected to the ground work machine 400 (the mid-mount mower in the present embodiment) via a lifting link structure 300 at the bottom of the vehicle main body 100. Can be installed.
This working vehicle A is a pair of left and right body frames 1, 1 arranged at a predetermined interval in the vehicle width direction (Y direction in the figure), and a pair of left and right bodies extending in the vehicle front-rear direction (X direction in the figure). The vehicle body frame 1, 1 is provided with an engine 2 as a drive source and a transmission case 3 that are separated from each other in the front-rear direction, and the driving force from the engine 2 is provided in the vehicle longitudinal direction. X is configured to be able to transmit to a pair of steered wheels and a pair of non-steered wheels respectively disposed on one side and the other side. In the present embodiment, the pair of left and right front wheels 4 and 4 are steered wheels, and the pair of left and right rear wheels 5 and 5 are non-steered wheels.
That is, a front axle 4a that supports the front wheels 4 and 4 is supported at the front of the body frame 1 and 1, and the rear wheels 5 and 5 are moved outward from the transmission case 3 in the vehicle width direction Y. The rear axle 5a to be supported protrudes. The elevating link structure 300 is disposed between the front axle 4a and the rear axle 5a. A PTO shaft (not shown) projects from the rear surface of the mission case 3.

  In the vehicle main body 100, the engine 2 is disposed inside the hood 6 at the front of the vehicle main body 100. A dashboard 7 is disposed behind the bonnet 6, a steering handle 8 is provided on the dashboard 7, a handle column 9 is provided below the steering handle 8, and a driver seat 10 is provided rearward. Is arranged. Behind the driver's seat 10, a safety frame 13 called a “Lops” is provided to protect the worker when the work vehicle A falls.

The dashboard 7 near the steering handle 8 and the rear wheel fender 11 on the side of the driver's seat 10 are provided with operation members such as various operation levers.
A step base 12 is provided from the lower front side of the driver's seat 10 to the dashboard 7, and the rear wheel fender 11 is provided behind the step base 12. The driver's seat 10 is disposed above the rear wheel fender 11.

In addition, a pair of left and right lift arms 14, 14 that are hydraulically driven are provided on the rear part of the rear transmission case 3 of the vehicle 100 so as to be swingable in the vertical direction.
The elevating link structure 300 is for connecting the midmount mower 400 to the lower side of the body frames 1 and 1 so as to be movable up and down. As will be described later, the elevating link structure 300 moves up and down. The mid-mount mower 400 connected to the elevating link structure 300 is moved up and down in conjunction with the movement.

This will be further described with reference to FIGS.
FIG. 3 is a side view mainly showing the body frames 1 and 1 and the lifting link structure 300 in the working vehicle A, and FIG. 4 is a plan view of the configuration shown in FIG. FIG. 5 shows a perspective view of the configuration shown in FIG. 3 as viewed obliquely from the upper rear, and FIG. 6 shows a perspective view of the configuration shown in FIG.

As shown in FIGS. 3 to 6, the lift link structure 300 has base end portions 311, 311 around the first swing axis P <b> 1 along the vehicle width direction Y on the pair of left and right body frames 1, 1. A pair of left and right first link arms 310, 310 coupled so as to be swingable, a pair of left and right support members 320, 320 disposed so as to be coaxial with the first swing axis P1, and the first A pivot shaft 330 disposed so as to be coaxial with the second swing axis P2 along the vehicle width direction Y at a position spaced apart from the first swing axis P1 in the vehicle longitudinal direction X; With the portions 341, 341 being supported by both ends of the pivot shaft 330, the free end sides 312, 312 of the pair of left and right first link arms 310, 310 (in this embodiment, the base end and the tip end) A pair of left and right intermediate link arms 3 And a pair of left and right second link arms 340 and 340 that are rotatably connected about an axis rotation along the width direction of the vehicle Y through the 0, 350.
In the present embodiment, the pair of left and right first link arms 310 and 310 are provided with a pair of left and right connecting arms 313 and 313, respectively, and the midmount mower 400 is attached to the pair of connecting arms 313 and 313. ing.

  FIG. 7 is a perspective view of a state in which the base end portions 311 and 311 of the pair of left and right first link arms 310 and 310 are respectively supported by the support members 320 and 320 in the configuration shown in FIG. 8 and FIG. 8, in the configuration shown in FIG. 3, the free end sides 312 and 312 of the pair of left and right first link arms 310, the pivot shaft 330, the pair of left and right second link arms 340 and 340, and The perspective view which looked at said left-right paired intermediate link arm 350,350 part from diagonally downward front is shown.

As described above, the pair of left and right support members 320 are arranged so as to be coaxial with the first swing axis P1, and as shown in FIG. It is fixed so as to protrude outward with respect to the body frames 1 and 1.
The pair of left and right first link arms 310, 310 have through holes in the base end portions 311, 311 along the vehicle width direction Y, and the through holes are formed in the support members 320, 320. It is inserted so as to be rotatable about one swing axis P1 and is held by holding members 321 and 321 having an L-shape when viewed from the bottom so as not to fall out of the support members 320 and 320.

The pivot shaft 330 can be attached to and detached from the body frames 1 and 1 from below. Specifically, in the present embodiment, as shown in FIG. 8, the elevating link structure 300 further includes superposed regions 361 and 361 that are superposed on the airframe frames 1 and 1, and the superposed regions 361 and 361, respectively. A pair of left and right holding members 360, 360 having extending regions 362, 362 extending in the direction are provided. Each of the holding members 360 and 360 is a plate-like member having an inverted triangular shape when viewed from the side. The holding members 360 and 360 are overlapped with the outside of the body frame 1 and 1 by the mounting members BL such as bolts and nuts in the overlapping regions 361 and 361. In the extended regions 362 and 362, the pivot shaft 330 is supported so as to be rotatable about the second swing axis P2. The holding members 360, 360 are provided with a long hole in at least one of the holding members 360, 360 and the body frame 1, 1, and the vehicle width in the vehicle longitudinal direction X or the like with respect to the body frame 1, 1. You may connect so that position adjustment is possible in the direction orthogonal to the direction Y. FIG.
The second link arms 340 and 340 have base end portions 341 and 341 connected to both end portions of the pivot shaft 330 so as not to rotate relative to each other.
The intermediate link arms 350 and 350 connect the first link arms 310 and 310 and the second link arms 340 and 340 so as to be rotatable about an axis along the vehicle width direction Y, respectively, and have one end 350a. 350a on the free end sides 342 and 342 of the second link arms 340 and 340, and the other end portions 350b and 350b on the free end sides 312 and 312 of the first link arm 310, respectively, in the vehicle width direction Y. It is connected so as to be rotatable about an axis line along.

  Further, the pair of left and right first link arms 310 and 310 exceed a connection point P3 operatively connected to the pair of left and right second link arms 340 and 340 via the intermediate link arms 350 and 350, respectively. The extended portions 312a and 312a are extended and the extended portions 312a and 312a come into contact with the pivot shaft 330 so that the highest rise position of the midmount mower 400 is regulated. .

As shown in FIGS. 3 to 6, the pivot shaft 330 has a first link member 331. The first link member 331 extends outward from the pivot shaft 330 with respect to the second swing axis P2, and is provided on the pivot shaft 330 so as not to rotate relative to the axis. The first link member 331 has an engaging portion 331b whose free end side 331a extends in the vehicle width direction Y.
The pair of left and right lift arms 14, 14 have base ends 14a, 14a connected to a lift arm shaft 141 along the vehicle width direction Y so as not to rotate relative to the axis. The lift arm shaft 141 is supported by a support member (not shown) of the vehicle main body 100 so as to be rotatable about an axis along the vehicle width direction Y. The lift arm shaft 141 has second and third link members 142 and 143. Each of the second and third link members 142 and 143 extends outward from the lift arm shaft 141 with respect to the axis of the lift arm shaft 141, and cannot rotate relative to the lift arm shaft 141 around the axis. Is provided.

The free end side 142 a of the second link member 142 is connected to the body frame support shaft 1 b via the hydraulic cylinder 15. The fuselage frame support shaft 1b is formed in the rear portion of the fuselage frame 1, 1 so that the open portions 1a 'and 1a face upward. , 1a ′, it extends through along the vehicle width direction Y. The hydraulic cylinder 15 is rotated about an axis along the vehicle width direction Y, with one end 15a on the free end 142a of the second link member 142 and the other end 15b on the body frame support shaft 1b. It is connected freely.
The free end side 143a of the third link member 143 is operatively connected to the free end side 331a of the first link member 331 through a fourth link member 144. One end portion 144a of the fourth link member 144 is connected to the free end side 143a of the third link member 143 so as to be rotatable around an axis along the vehicle width direction Y, and the other end portion 144b is connected to the first link portion 144a. The one link member 331 is engaged with an engaging portion 331b on the free end side 331a so as to be rotatable about an axis along the vehicle width direction Y. The engaging portion 331b is provided with a retaining member 331b ′ for preventing the other end portion 144b of the fourth link member 144 from coming off from the engaging portion 331b.

  In the elevating link structure 300 described above, when the mid mount mower 400 is connected to the body frame 1, 1 using the elevating link structure 300, for example, the holding members 360, 360 are connected to the overlapping region 361. , 361 is attached to the body frame 1, 1 by the attachment member BL. At this time, the holding members 360 and 360 may be provided with the pivot shaft 330 in the extending regions 362 and 362. The pivot shaft 330 may be provided with the second link arms 340 and 340, the intermediate link arms 350 and 350, and the first link arms 310 and 310. The other end portion 144b of the fourth link member 144 is engaged with the engaging portion 331b of the first link member 331 of the pivot shaft 330, and is prevented from being detached by the retaining member 331b '. On the other hand, the base end portions 311 and 311 of the first link arms 310 and 310 are inserted into the support members 320 and 320 and are held by the holding members 321 and 321. The mid-mount mower 400 is connected to the first link arms 310 and 310 of the lift link structure 300 attached in this way.

  Further, when the elevating link structure 300 is removed from the body frame 1, 1, for example, the retaining member 331 b ′ is removed from the engaging portion 331 b of the first link member 331 of the pivot shaft 330. The other end portion 144b of the fourth link member 144 engaged with the engaging portion 331b is removed. Then, the attachment member BL is removed, and the holding members 360 and 360 are removed from the body frame 1 and 1. At this time, the holding members 360 and 360 may be provided with the pivot shaft 330 in the extending regions 362 and 362. The pivot shaft 330 may be provided with the second link arms 340 and 340, the intermediate link arms 350 and 350, and the first link arms 310 and 310. Meanwhile, the holding members 321 and 321 are removed from the base end portions 311 and 311 of the first link arms 310 and 310, and the base end portions 311 and 311 are removed from the support members 320 and 320.

When the lift arms 14 and 14 are rotated upward (in the direction of arrow A1 in FIG. 3) by the hydraulic cylinder 15 in a state where the lifting link structure 300 is attached to the body frame 1 and 1, The lift arm shaft 141 rotates in the counterclockwise direction B1 in FIG. By the rotation of the lift arm shaft 141, the fourth link member 144 moves to the rear of the vehicle (in the direction of arrow A2 in FIG. 3) via the third link member 143, and accordingly, the pivot shaft 330 is moved. It rotates clockwise B2 in FIG. 3 via the first link member 331. Then, the first link arms 310 and 310 are rotated in the counterclockwise direction B1 in FIG. 3 via the second link arms 340 and 340 and the intermediate link arms 350 and 350 by the rotation of the pivot shaft 330. As a result, the free end sides 312 and 312 of the first link arms 310 and 310 move upward (in the direction of arrow A3 in FIG. 3).
The extension portions 312a and 312a of the first link arms 310 and 310 abut against the pivot shaft 330 when the first link arms 310 and 310 rotate upward, The most elevated position of the midmount mower 400 is regulated.

  On the other hand, when the lift arms 14, 14 are rotated downward (in the direction of arrow A1 'in FIG. 3) by the hydraulic cylinder 15, an operation opposite to the above-described operation is performed, and the first link arm 310 is operated. 310 move downward (in the direction of arrow A3 ′ in FIG. 3) due to their own weight.

As described above, according to the lifting link structure 300, the pivot shaft 330 can be attached to and detached from the machine body frames 1 and 1 from below, so that the work vehicle A can be easily attached and detached. be able to.
For example, in a state where the second link arms 340, 340, etc. are provided, the pivot shaft 330 can be detached from the machine frame 1, 1 from below, and the conventional frame 330, 1, between the machine frame 1, 1 and the ground It is not necessary to perform the detaching operation with respect to the body frames 1 and 1 in a limited space, and the attachment and detaching operation with respect to the work vehicle A can be facilitated accordingly.

  In addition, when the holding members 360 and 360 are connected to the machine frame 1 and 1 so that the position thereof can be adjusted, the degree of freedom in setting and adjusting the mounting position of the pivot shaft 330 with the machine frame 1 and 1. Can be improved. In addition, the position of the second swing axis P2 can be changed as appropriate by changing the shape of the holding members 360 and 360, or by changing the mounting location. It can be made easy to correspond to the frame.

  In addition, since the extended portions 312a and 312a of the first link arms 310 and 310 are in contact with the pivot shaft 330, the most elevated position of the midmount mower 400 is regulated. The first link arms 310 and 310 can also be used as members for restricting the most elevated position of the midmount mower 400. Therefore, the highest position of the midmount mower 400 can be regulated without providing a dedicated regulating member, and the cost can be reduced accordingly.

In the present embodiment, the holding members 360 and 360 are superposed on the outer surface side of the body frame 1, 1, but are superposed on the inner surface side of the body frame 1, 1, or both the outer surface side and the inner surface side. It may be configured. The pivot shaft 330 is supported on the body frame 1, 1 via the holding members 360, 360. The body frame 1, 1 is provided with a notch that opens downward, and the notch is used. Then, the pivot shaft 330 may be configured to be supported by the body frame 1, 1.
In the present embodiment, the link member 331 is provided between the body frames 1, 1 with respect to the pivot shaft 330, but may be provided outside the body frames 1, 1. The second link arms 340 and 340 are connected between the base end portion and the tip end portion of the first link arms 310 and 310 via the intermediate link arms 350 and 350. You may connect with the front-end | tip part in the arms 310,310. The first link arms 310 and 310 have the extending portions 312a and 312a extending beyond the connecting point P3, and the extending portions 312a and 312a come into contact with the pivot shaft 330. The uppermost position of the mid mount mower 400 is regulated, but the pivot shaft 330 is connected to the base end portions 311 and 311 from the connection point P3 of the first link arms 310 and 310. It may be configured such that the highest position of the mid-mount mower 400 is regulated by abutting.

As described above, when the highest position of the midmount mower 400 is configured to be regulated, the pivot shaft 330 is directly connected to the body frame 1, 1 (for example, the body frame 1, 1 may be configured to be supported by a through-hole formed in 1.
Further, in the present embodiment, the first link arms 310 and 310 are rotated by rotating the pivot shaft 330 from the hydraulic cylinder 15 via the lift arm shaft 141 and the fourth link member 144. The first link arms 310 and 310 may be directly rotated from the hydraulic cylinder 15 via a predetermined link member. In this case, the pivot shaft 330 is supported by the holding members 360, 360 so as not to rotate relative to the axis, and base end portions 341, 341 of the second link arms 340, 340 are connected to the pivot shaft 330. It may be connected so as to be rotatable about the swing axis P2.
The lifting link structure 300 is lifted and lowered by driving the hydraulic cylinder 15, but may be configured to be lifted and lowered manually by a predetermined manual operation member.

FIG. 1 is a side view of a working vehicle provided with a lifting link structure according to the present embodiment. FIG. 2 is a plan view of the working vehicle shown in FIG. FIG. 3 is a side view mainly showing the machine body frame and the lifting link structure portion in the working vehicle. 4 is a plan view of the configuration shown in FIG. FIG. 5 is a perspective view of the configuration shown in FIG. FIG. 6 is a perspective view of the configuration shown in FIG. FIG. 7 is a perspective view of the state shown in FIG. 3 as viewed obliquely from the lower front side in which the base end portions of the pair of left and right first link arms are respectively supported by the support member. FIG. 8 is a perspective view of the free end sides of the pair of left and right first link arms, the pivot shaft, the pair of left and right second link arms, and the pair of left and right intermediate link arms as viewed obliquely from the lower front in the configuration shown in FIG. FIG.

DESCRIPTION OF SYMBOLS 1 ... Airframe frame 300 ... Elevating link structure 310 ... 1st link arm
311 ... Base end portion of the first link arm 312 ... Free end side of the first link arm
312a ... Extension portion of first link arm 330 ... Pivot shaft 340 ... Second link arm
341 ... Base end portion of second link arm 350 ... Intermediate link arm
360 ... holding member 361 ... overlapping region of holding member 362 ... extension region of holding member
400 ... Working machine A ... Working vehicle P1 ... First swing axis P2 ... Second swing axis
P3: Connection point of the first link arm X: Vehicle longitudinal direction Y: Vehicle width direction

Claims (3)

An elevating link structure for connecting the work machine so that the work machine can be raised and lowered below the machine frame in the work vehicle,
A first link arm whose base end is directly or indirectly connected to the body frame so as to be swingable around a first swing axis along the vehicle width direction;
A pivot shaft disposed coaxially with the second swing axis along the vehicle width direction at a position spaced from the first swing axis in the vehicle longitudinal direction;
A second link arm operatively connected to a free end side of the first link arm in a state where a base end portion is supported by the pivot shaft;
The first link arm has an extending portion that extends beyond a connection point that is operatively connected to the second link arm;
The elevating link structure characterized in that the extended portion of the first link arm is in contact with the pivot shaft so that the highest rise position of the work implement is regulated. The lifting link structure according to claim 1, further comprising an intermediate link arm that connects the first link arm and the second link arm. A holding member having a superposition region superposed on the body frame and an extension region extending downward from the superposition region;
The elevating link structure according to claim 1 or 2 , wherein the holding member is connected to the body frame through the overlapping region, and the pivot shaft is supported by the extending region.

Images