JPS6235288Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a work implement coupling device for an agricultural tractor.

Conventionally, a type of quick coupler for a three-point hitch that lifts a working machine is known. However, in that case, it was necessary to connect the universal joint between the PTO shaft on the machine side and the input shaft on the work equipment side by hand, which caused a problem in that it was time-consuming to attach and detach the work equipment.

In this invention, a support part of the universal joint is provided in advance on the quick coupler frame, and a drive shaft with universal joints at both front and rear ends is assembled in advance between the PTO shaft on the machine side and the universal joint support part of the quick coupler frame. At the same time, a clutch and clamp mechanism were installed that connected by approaching each other in the front and rear direction, so that not only the work machine itself but also the drive system could be connected at the same time by simply moving the tractor backwards relative to the work machine. do.

Figure 1 is a schematic left side view of a three-point link hitch 1 at the rear of an agricultural tractor and a working machine (rotary) 2 placed at a distance behind it (on the right side of the figure).
A gate-shaped quick coupler frame 5 is attached to the rear end of the pair of left and right lower links 3 and one top link 4 above them (the rear part in the reverse F direction, that is, the right end in the figure) of the three-point link hitch 1. It is pivotally connected via pins 6 and 7 in the vehicle width direction. The left lower link 3 shown in Fig. 1 has its front end (left end in the figure) supported by a bracket 10 on the rear axle case 9 side via a pin 8, and the middle part near the rear end is supported by a lift. It is connected to the left lift arm 12 via a link 11. 13 is the lift axis,
It is supported by a hydraulic cylinder case 14 attached to the rear axle case 9, and left and right lift arms 1 are provided at portions protruding outward from the case 14 to the left and right.
The front end of 2 is fixed. Lower link 3 on the right
Similarly, it is connected to the right lift arm 12 via the right lift link 11. The top link 4 extends in the front-rear direction between the two lift links 11, and its front end connects to the bracket 1 via a pin 20.
Connect to 5. A PTO shaft 16 protruding rearward from the rear axle case 9 is connected to the front end of a drive shaft 18 via a universal joint 17, and the rear end of the drive shaft 18 is connected to a universal joint 19 supported by the quick coupler frame 5. It is connected to the rear yoke 49. The universal joints 17 and 19 are both made of a pair of yokes and a cross-shaped spider connecting both yokes, and one yoke of the universal joint 17 is connected to the PTO shaft 16.
The other yoke is spline-fitted to the drive shaft 18, and the other yoke is spline-fitted to the drive shaft 18. One yoke of the universal joint 19 is spline-fitted to the drive shaft 18,
The other rear yoke 49 is rotatably supported by the quick coupler frame 5, as will be described later.

The quick coupler frame 5 has a rectangular cylinder-shaped bracket 2 that opens rearward at the upper end and both left and right lower ends.
1, and a guide 22 protruding rearward from the lower end of the bracket 21 has a rear downward slope 23 on the upper side. Both ends of a pin 24 are fixed to the left and right side walls of the bracket 21, and a hook claw 25 is rotatably supported on the pin 24 within the bracket 21. A coil spring 26 is compressed between the upper wall of the bracket 21 and the hook claw 25 is connected to the pin 24.
It is normally pressed against the guide slope 23 by receiving a moment in the direction of arrow A about . Hook claw 2
5 has a front downward slope 27 and a downward opening hook surface 28 on the lower side.
A connecting pin 29 of the working machine 2, which will be described later, can be held between the hook surface 28 and the guide 22, and at this time, the pin 29 is located directly behind the pin 24 and is attached to the vertical rear edge of the hook surface 28. Coupled with the fact that the hook claw 25 is receiving a moment in the direction of arrow A by the coil spring 26, there is no fear that the pin 29 will come off from the hook claw 25 when the work machine is towed. A solenoid 30 is installed on the bracket 21 at a position below the hook pawl 25 and facing the coil spring 26.
is installed, and the iron core 31 inside the solenoid 30
The upper end faces the lower surface of the hook pawl 25, and when the solenoid 30 is energized, the iron core 31 protrudes upward and resists the elasticity of the coil spring 26 to move the hook pawl 25 in reverse A.
direction to release the pin 29 from the hook claw 25.

The three connecting pins 29 on the work machine 2 side are provided horizontally at the upper end and the left and right lower ends of the quick coupler frame 33, which has a shape corresponding to the quick coupler frame 5 on the machine side. The pins 29 are opposed to rear-opening V-shaped slopes 23 and 27, respectively. An input shaft 35 projects forward from a gearbox 34 of the working machine 2, and a front beam 36 projects in the vehicle width direction from the left and right side walls of the gearbox 34, and a gear case 37 is attached to one end of the front beam 36. 38 is a rotor pawl, 39 is a tail wheel frame, 40
is an adjustment pipe, 41 is a tail wheel, and 42 is a rotary cover. A bracket 43 is attached near the end of the front beam 36 near the gear case 37 so as not to interfere with the quick coupler frame 5, and a stand 44 is attached to the front end of the bracket 44 so as to be vertically adjustable. This stand 44 serves to prevent the work machine 2 from retreating when the tractor is pushed backwards and the hook claw 25 is pressed against the connecting pin 29 against the standby work machine 2, but it is retracted upward during plowing work. It is a member.

In FIG. 2, which is a rear view of the quick coupler frame 5 in FIG. The metal 47 rotatably supports the boss portion of the rear yoke 49.

In Fig. 3 showing the - section of Fig. 2, 5
0 is a spider, and 51 is a front yoke. The yoke 49 has a stepped spline hole 52 facing rearward (in the reverse F direction), and a coil spring 55 is inserted between the dog claw 53 fitted in the spline hole 52 and the stepped portion 54.
has been reduced. 56 is a snap ring.
The yoke 49 has a conical surface 58 near the rear end of the boss portion 45 that becomes narrower toward the rear, while the flange 59 at the front end of the input shaft 35 on the working machine side
3 and a conical surface 61 that engages with the conical surface 58. The conical surfaces 58 and 61 play the role of guiding the dog claws 53 and 60 so that their center lines coincide when the tractor is moved backward toward the standby working machine.
After 60 are engaged, they press against each other and function as a cone clutch.

To connect the standby working machine 2 to the three-point link hitch 1 of the tractor as shown in FIG. 1, adjust the height of the quick coupler frame 5 on the tractor side using the lift arm 12, and then 27 to match the height of the working machine side connecting pin 29, the tractor is gently moved backward and the slope 27 is pressed against the pin 29. At that time, the stand 44 is preventing the work equipment 2 from moving backward, so the hook claw 2
5 rotates in the reverse A direction against the elasticity of the coil spring 26, and when the slope 27 passes the pin 29, the pin 2
9 fits within the hook surface 28. Universal joint 19 supported at the same time by quick coupler frame 5
The dog pawl 53 (FIG. 3) engages with the dog pawl 60 of the working machine input shaft 35, thereby also connecting the power system. Thereafter, by raising the stand 44 to a predetermined height and fixing it to the bracket 43, the tilling work can be continued.

To remove the work implement 2, the tractor is stopped and the solenoid 30 is energized. Then solenoid 3
0, the iron core 31 protrudes upward due to the excitation, and the hook pawl 25 rotates in the opposite direction A against the elasticity of the coil spring 26, releasing the connecting pin 29, so if the tractor is moved forward slightly in this state, , hook claw 2
5 moves forward from the connecting pin 29, and at the same time, the tractor-side dog claw 53 moves forward from the working machine-side dog claw 60, allowing the tractor to move forward, leaving the working machine 2 behind. Thereafter, the stand 44 is erected to the position shown in FIG. 1 in preparation for the next connection operation.

Instead of using the solenoid 30 to release the connecting pin 29 from the hook pawl 25, a hydraulic cylinder 63 may be employed as shown in FIG. The hydraulic cylinder 63 is attached to the bracket 21, and the rod 65 of the piston 64 fitted inside is connected to the hook pawl 2 through a pin 67 at the yoke 66.
Connected to 5. In this case, the coil spring 26 is mounted around the rod 65. Stand 44
A brake may be attached to the tail wheel 41 instead. The stand 44 may not be necessary in some cases.

As explained above, according to the present invention, the rear yoke 49 of the universal joint 19 at the rear end of the drive shaft is attached to the half metal 49 at the center of the quick coupler frame 5.
7, the position of the rear universal joint 19 relative to the quick coupler frame 5 is fixed. In addition, since a clamp mechanism consisting of a hook pawl 25 and a pin 29 and a clutch consisting of dog pawls 53 and 60 are provided, not only the main body of the work machine 2 but also the drive system can be removed by simply reversing the quick coupler frame 5 together with the tractor. Can be connected at the same time.
This makes connection of the working machine extremely easy.

The quick coupler frame 5 is attached to the rear end of the three-point link hitch 1 in advance, and the drive shaft 18 is connected to the PTO shaft 16 on the tractor side in advance. By supporting the rear end yoke 49 in advance and moving the three-point link hitch 1 up and down, the rear end yoke 49 is
Since the clamping mechanism of the quick coupler frame 5 can be adjusted in the vertical direction at the same time, the drive shaft 18 and the clamping mechanism can be easily aligned with respect to the working machine while the working machine is placed on the ground.

Drive shaft 18 pre-assembled on the tractor side
and quick coupler frame 5 unit,
Since various types of working machines are detachably mounted, there is no need to replace the drive shaft 18 for each working machine, and the workability of mounting is further improved.

To elaborate again on the important advantages of this invention:
The operator can connect the work equipment 2 to the 3-point link hitch 1 by simply moving the 3-point link hitch 1 up and down and moving the tractor backward while riding on the tractor, while leaving the work equipment 2 on the ground. Also, the working machine input shaft 35 can be easily connected to the drive shaft 18 at the same time.

That is, the front end of the drive shaft 18 is placed on the tractor side in advance.
The rear end of the drive shaft 18 is connected to the PTO shaft 16, and the rear yoke 49 of the rear end universal joint 19 of the drive shaft 18 is supported in advance on the quick coupler frame 5 at the rear end of the three-point link hitch 1. Since the three-point link hitch 1 allows for vertical movement, it is possible to adjust the vertical position of the quick coupler frame 5 relative to the work machine 2 and to adjust the input shaft 35 of the work machine 2.
The vertical position of the drive shaft 18 can be adjusted by vertically moving the three-point link hitch 1 by hydraulic operation in the cockpit. Moreover, since it is equipped with a clutch and clamp mechanism that connects by approaching in the front and back direction, the work equipment 2 and the drive shaft 18 can be connected to the tractor by simply reversing the tractor after adjusting the vertical position. You can easily do both at the same time.

[Brief explanation of the drawing]

Figure 1 is a schematic left side view of the rear three-point link hitch of the tractor and the work equipment waiting behind it, Figure 2 is a partial view of Figure 1 in the direction of the - arrow, and Figure 3 is an enlarged cross-sectional view of Figure 2. , FIG. 4 is a drawing corresponding to a part of FIG. 1 for showing another embodiment. 1... Three-point link hitch, 5... Quick coupler frame, 6, 7... Pin, 9... Rear axle case, 16... PTO axis, 17, 19...
Universal joint, 18...Drive shaft, 45...Yoke boss part, 47...Half metal (support part), 25
...Hook claw (clamp mechanism), 53,60...
Dotsugu nail (kuratsuchi).

Claims (1)

[Scope of utility model registration request] A quick coupler frame is pivotally attached to the rear end of the three-point link hitch, and the front end of the drive shaft is connected in advance to the rear end PTO shaft of the tractor via a universal joint, and the rear yoke of the universal joint at the rear end of the drive shaft is connected in advance. is supported on the quick coupler frame in advance, and the position of the rear end yoke of the universal joint can be adjusted in the vertical direction along with the quick coupler frame by vertically moving the three-point link hitch, and the rear yoke is positioned between the rear yoke and the front end of the work equipment input shaft. A clutch is provided that connects by approaching in the front-rear direction, and a clamp mechanism is provided between the quick coupler frame and the work machine that engages by approaching in the front-rear direction. A work equipment coupling device for an agricultural tractor, characterized in that the coupling can be performed simultaneously.