JP4769529B2 - Installation method of work equipment - Google Patents

Description

The present invention relates to a method for mounting a work machine that connects the work machine to a work vehicle .

  As a connecting part for connecting a work vehicle such as a tractor and a work machine, a three-point hitch type (hereinafter referred to as 3P hitch) that connects the work machine with two points on the lower side and one point on the upper side, and two work machines A two-point hitch type (hereinafter referred to as 2P hitch) that connects by points is known (see, for example, Patent Document 1).

  The 2P hitch is composed of a hitch portion that attaches the work implement to the rear portion of the work vehicle at two points. In the case of the 2P hitch, the work machine is mounted on the work vehicle with the work machine side directly connected to the hitch portion. The 3P hitch is composed of a total of three hitch portions each having a top link and two lower links rotatably attached to the rear portion of the tractor and provided at the top link and the tips of both lower links. The work implement is attached to three hitch portions provided at the tip of each link, and is attached to the tractor via the top link and the lower link.

When the work machine is connected by any of the above methods, the work machine is connected to the work vehicle so as to be lifted and lowered. On the work vehicle side, a lift arm that is swing-driven by hydraulic pressure or the like is provided. In the case of the 2P hitch, the lift arm and the work machine are connected to each other, and in the case of the 3P hitch, the lift arm and the lower link are respectively connected by a lift rod or the like. With the swinging of the lift arm, the work implement side swings up and down directly in the case of 2P hitch, and in the case of 3P hitch, the lower link and top link swing up and down so that the work implement moves up and down with respect to the work vehicle. To do.
JP-A-9-271205

  For example, when the 3P hitch specification is made by removing the hitch part from the 2P hitch specification work vehicle and attaching the lower link and the top link to the 3P hitch specification, the work to be attached to the three-point hitch because the swing range of the lift arm is predetermined. In some cases, the height of the machine rises short of the originally required height. In this case, the work machine may come into contact with the heel when turning around the heel, which has the disadvantage that the work cannot be performed smoothly.

The present invention for solving the above problems, the working machine 2, 31 to the lift arm 17 provided to be driven to swing vertically Therefore the lift, the mounting method of the working machine coupled to the work vehicle, the working machine 2 when the coupling by two points, two hitch portion 16 of the two-point hitch to the working vehicle is provided, the hitch portion 16 of the two-point hitch mounting the working machine 2, a connecting member 18 for 2-point hitch through it, while connecting the working machine 2 to the lift arm 17, when connecting the working machine 31 by three points, three points by three link arms 21, 22 hitch part is provided at an end hitch The three link arms 21 and 22 are mounted on the work vehicle, and the work machine 31 is connected to the lift arm 17 via the connection members 23 and 24 for the three-point hitch. 2 A connecting portion 27 for connecting the connecting member for the point hitch and a connecting portion 28 for connecting the connecting member for the three-point hitch are provided separately, and the connecting portion for connecting the connecting member for the two-point hitch from the swing fulcrum of the lift arm 17. Both connecting portions 27 and 28 are arranged so that the distance from the swing fulcrum of the lift arm 17 to the connecting portion 28 with the connecting member for the three-point hitch is longer than the distance to 27.

According to the present invention constructed as described above, the lift arm, and a connecting portion of the connecting member for the two-point hitch, and the connecting portion of the connecting member for three-point hitch is provided separately Therefore, even when the swing angle of the lift arm is kept constant, the lift required for the work implement is secured using the 2-point hitch and the 3-point hitch, and the work implement is lowered to the required predetermined height. Can be raised. Accordingly, there is an effect that the work vehicle can be easily switched between the 2-point hitch specification and the 3-point hitch specification.

  FIG. 1 is a side view showing a state in which a rotary work machine 2 is connected as a work machine to a tractor 1 which is a work vehicle employing the present invention. The tractor 1 includes a front wheel 3 and a rear wheel 4 as in the prior art. A bonnet 6 is provided in the front. An engine is mounted in the bonnet 6. A driver's seat 7 is provided behind the bonnet 6. A seat 8 is provided in the driver's seat 7. The tractor 1 travels with the front wheels 3 and the rear wheels 4 driven by the driving force of the engine in the hood 6.

  In the rotary working machine 2, a rotary rotary 11 is supported on the working machine frame 9 side so as to be rotatable. When the rotary work machine 2 is connected to the tractor 1, a driving force is transmitted from a PTO shaft 12 provided on the tractor 1. The rotary 11 is rotationally driven by this driving force, so that the farming work in the field can be performed.

  Pins 13 for connection to the tractor 1 are provided on the left and right of the front end side of the work machine frame 9, respectively. At the rear part of the tractor 1, a bracket 14 for connecting the work machine is detachably attached to the machine body frame 1a side.

  Corresponding to the left and right pins 14 in front of the rotary work machine 2, the bracket 14 is integrally provided with left and right receivers 16 having a substantially inverted U shape when viewed from the side. The rotary working machine 2 is connected to the tractor 1 at two points by accommodating the pins 13 of the rotary working machine 2 in the corresponding receivers 16 and preventing the pins 13 from coming off from the receivers 16.

  The left and right receivers 16 form hitch portions. By attaching the bracket 14, the tractor 1 constitutes a two-point hitch (2P hitch) specification including two hitch portions (receivers 16). The tractor 1 is provided with a lift arm 17 that is driven to swing up and down by hydraulic pressure above the bracket 14. The front end of the lift arm 17 is a pivot point.

  The lift arm 17 and the work machine frame 9 side of the rotary work machine 2 are connected by a lift rod 18. The lift rod 18 constitutes a connecting member that connects the lift arm 17 and the work machine (rotary work machine 2) side in the 2P hitch specification.

  When the lift arm 17 is driven to swing upward, the rotary working machine 2 swings upward using the pin 13 as a fulcrum through the lift rod 18. When the lift arm 17 is driven to swing downward, the rotary work machine 2 swings downward using the pin 13 as a fulcrum through the lift rod 18. The rotary work machine 2 moves up and down as described above.

  The swing of the lift arm 17 is set so that the lifting stroke (lifting height) of the rotary working machine 2 has a predetermined size. As a result, the rotary work machine 2 is lifted and lowered within a range from the predetermined lower limit position to the upper limit position. When the rotary working machine 2 is raised to the upper limit position, the rotary working machine 2 does not contact the heel when turning at the heel. When the rotary working machine 2 is lowered to the lowest limit position, it is possible to perform a tilling work at a predetermined deepest tillage depth.

  As shown in FIG. 2, the tractor 1 can be rotatably attached to lower links 21 that protrude rearward on the left and right sides of the lower side of the body frame 1 a. A top link 22 that protrudes rearward so as to be positioned at the center of the left and right lower links 21 in a plan view can be rotatably mounted above the body frame 1a. The lower link 21 and the top link 22 have a rotation fulcrum on the front end side.

  At the rear ends of both the lower links 21 and the top links 22, a connecting portion (hitch portion) for the work machine is provided. Both the lower links 21 and the top links 22 constitute a three-point link hitch, and the tractor 1 constitutes a three-point hitch (3P hitch) specification by attaching both the lower links 21 and the top links 22.

  One end of a lift rod 23 is connected to the lower link 21. A cylinder rod 26 in a cylinder 24 connected to the lift arm 17 is connected to the other end of the lift rod 23. The cylinder 24 and the lift rod 23 constitute a connecting member that connects the lift arm 17 and the lower link 21 in the case of the 3P hitch specification.

  The lift arm 17 is provided with a connecting portion 28 for connecting the cylinder 24 (connecting member) separately from the connecting portion 27 at a position behind the connecting portion 27 with the lift rod 18 used in the 2P hitch specification described above. It has been. Both connecting portions 27 and 28 are holes for supporting the lift rod 18 or the cylinder 24.

  When the lift arm 17 is driven to swing upward, the lower link 21 swings upward with the front side as a fulcrum via the connecting member (cylinder 24 and lift rod 23). When the lift arm 17 is driven to swing downward, the lower link 21 swings downward with the front side as a fulcrum through the connecting member.

  FIG. 2 is a side view showing a state in which a digging work machine 31 for digging firewood or the like is connected and attached to the hitch portions of the top link 22 and the lower links 21 (three-point link hitch). As shown in FIG. 2, when a digging work machine 31 is connected to the 3P hitch (three-point link hitch) and the lift arm 17 is driven to swing up and down, the digging work machine 31 is operated by the operation of the lower link 21. Goes up and down. By driving the cylinder rod 26 by the cylinder 24, the right and left inclination of the digging work machine 31 connected to the 3P hitch can be controlled.

  The swingable angle of the lift arm 17 is 2P hitch specification (configuration using the top link 22 and both lower links 21 to connect the work implement) and the 2P hitch specification (receiving 16 is used to connect the work implement). In the case of the configuration of connecting), it is also constant.

  However, in the case of the 3P hitch specification, the distance from the pivot point of the lift arm 17 to the connecting point 28 of the connecting member that connects the lower link 21 and the lift arm 17 is the lift arm 17 of the connection point 27 in the case of the 2P hitch specification. Longer than the distance from the pivot point. For this reason, even if the swingable angle of the lift arm 17 is the same as that of the 2P hitch specification as described above, the lifting / lowering stroke (lift) of the working machine (digger 31) connected to the 3P hitch is determined in advance. It becomes the size.

  Thereby, the digging work machine 31 is raised and lowered in a range from the predetermined lower limit position to the upper limit position. When the digging work machine 31 is raised to the maximum upper limit position, the digging work machine 31 does not contact the heel when turning at the shore. When the digging work machine 31 is lowered to the lowest limit position, the digging work machine 31 can be inserted into the field at a predetermined deepest depth to perform digging work such as straw.

  As described above, the connecting portion 27 of the connecting member in the case of the 2P hitch specification and the connecting portion 28 of the connecting member in the case of the 3P hitch specification are provided in the lift arm 17 in advance, so that the tractor 1 is connected to the 2P hitch specification and the 3P hitch specification. The specification can be easily changed to the hitch specification and used, and in any case, the necessary lift can be secured, and the working machine can be made to perform a smooth operation.

  In particular, in the case of the 3P hitch specification, the swing angle of the lower link 21 is adjusted on the lift arm 17 side, so that the lower link 21 that is conventionally used for a 3P hitch specification tractor can also be used. it can. At this time, the connecting portion with the connecting member on the lower link 21 side can be used, and there is no need to provide a connecting point closer to the rotation fulcrum (front) than the original connecting portion position of the lower link 21 that is also used. In addition, it is possible to prevent inconveniences such as insufficient force for lifting the work implement (lift) and the strength of the lower link 21 that supports the work implement.

  Since it is not necessary to add parts to the lift arm 17, it is easy to change the specifications. In this embodiment, the bracket 14 having the two hitch portions (receiving 16) is removed and the top link 22 and the lower links 21 (three-point link hitch) are attached. However, the bracket 14 is attached. A three-point link hitch can be attached as it is.

It is a side view of a tractor in the state where a rotary work machine was connected by 2P hitch. It is a side view of the tractor of the state which connected the excavation work machine with 3P hitch.

Explanation of symbols

2 Rotary work machine (work machine)
16 Receiving (hitch part)
17 Lift arm
18 Lift rod (connecting member)
21 Lower link (link arm)
22 Top link (link arm)
23 Lift rod (connecting member)
24 Cylinder (connecting member)
27 connecting portion 28 connecting portion 31 digging work machine (work machine)

Claims (1)

Swing vertically drivable lifting arm provided (17) to thus lift is the work machine (2), (31), in mounting method of the work machine connecting to the work vehicle, the work machine (2) two points when connected by the two hitch of two points hitch the working vehicle is provided (16), hitch parts of 2-point hitch working machine (16) and (2) is mounted, connected for two-point hitch through the member (18), while connecting the working machine (2) to the lift arm (17), when the connecting work machine (31) by three points, hitch portion is provided on the end portion The three link arms (21), (22) constitute a three-point hitch, the three link arms (21), (22) are mounted on the work vehicle, and the three-point hitch connecting members (23), ( 24) to the lift arm (17) via the working machine (31) When connecting the lift arm (17) , the lift arm (17) is separately provided with a connection portion (27) for the connection member for the two-point hitch and a connection portion (28) for the connection member for the three-point hitch. Based on the distance from the swing fulcrum of (17) to the connecting part (27) with the connecting member for the 2-point hitch, the connecting part (28 of the lift arm (17) to the connecting member for the 3-point hitch (28) The attachment method of the working machine which has arrange | positioned both connection parts (27) and (28) so that the distance to) may become long.

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