JP3535883B2 - Work machine coupling device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called quick hitch.
In particular , the present invention relates to a working machine connecting device called a " quick hitch", which is intended to mount a plurality of working machines . 2. Description of the Related Art A conventional device is disclosed in Japanese Patent Application Laid-Open No. 2-215301.
As disclosed in Japanese Unexamined Patent Publication No.
The outer end spline hole, which is the outer end of the transmission universal joint,
It slides back and forth a little through the spring. [0003] In such a conventional apparatus, since the front and rear slide amount of the outer end spline hole is small, the position of the PTO input shaft protruding from the agricultural working machine at the rear end of the universal joint. but if has changed position over large sliding amount in the longitudinal position, a problem that can not be attached to agricultural machine quick hitch has Tsu Yes. Further, when the height of the input shaft of the agricultural machine which may be attached are different, or bought difficulty meshing spline connection of the universal joint, these
Position operation had a problem that has difficulty. [0004] The present invention is to solve such a problem of the conventional device, and has taken the following technical means. That is, the agricultural tractor 2
The top link 16 of the three-point link mechanism and the rear connection part of the pair of left and right lower links 17 are connected to the rear part, and the hitch frame 1 is provided at the rear connection part of the top link 16 and the pair of left and right lower links 17. The upper and left and right lower portions of the working machine 3 are respectively engaged and connected to the upper engaging portion 10 and the left and right lower engaging portions 13 and 13 of the frame 1, and the rotation of the transmission universal joint 4 on the tractor 2 side is controlled. A working machine coupling device for transmitting to the input shaft 21 on the working machine 3 side via a cylindrical body 33 having a spline hole 5 locked at a lower portion of the hitch frame 1;
A pair of left and right plates 15, 15 are provided below the hitch frame 1, and the tubular body 33 is locked to the plates 15, 15.
From the tractor 2 and the distance
Vertical Perspective Locking Grooves with Different End Positions
6 and 7, and the tractor is included in the perspective locking grooves 6 and 7.
In the near locking groove 7 close to the two sides, it was dropped between the two grooves 6 and 7.
The longitudinal direction of guiding the cylindrical body 33 to the upper part of the near locking groove 7
A working machine coupling device having a groove 7a formed therein. Embodiments of the present invention will be described below in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements and the like of the components described in this embodiment are as follows:
Unless there is a particular description, the scope of the present invention is not intended to be limited thereto, but is merely an illustrative example. In the illustrated example, the present invention is folded into a quick hitch 1 which is a one-touch hitch for attaching and detaching an agricultural work machine 3 which is a rotary tilling tool attached to a rear portion of the agricultural tractor 2. Quick hitch 1 is shown in Figs.
As shown in FIG. 6, a base frame 8 made of a pipe material having a lower opening mountain shape is mainly used, a top link mounting frame 9 and an upper hanger 10 are provided above the base frame 8 in the left-right direction, and the lower side plates 11, 11, receiving grooves 12, 12 and hooks 13, 13 are provided, and the left and right lower side plates 11, 11 are connected to each other by a connecting frame 14. The outer end spline holes 5 of the universal joint 4 are located above the connecting frame 14, and the left and right central side plates 15, 15 integrally attached to the connecting frame 14 on both sides of the universal joint 4.
Is provided with two perspective locking portions 6, 7 formed of perspective and longitudinal grooves , and has an outer end spline hole 5 .
The cylindrical body 33 is attached to one of the positions of the perspective locking portions 6 and 7 as a manually changeable type. The quick hitch 1 composed of these members is a three-point link attached to the machine frame of the agricultural tractor 2, which is a top link 16 at the upper center and rear ends of lower links 17 at the right and left lower sides. Attached to
The lift rod 1 is moved up and down by lift arms 18, 18 equipped with hydraulic actuators inside the agricultural tractor 2.
It moves up and down via 9,19. Next, the agricultural working machine 3 will be described mainly on a rotary tilling implement. An input shaft 21 projects forward from an upper transmission case 20 disposed above the center in the left-right direction, and an outer end spline hole 5 serving as a rear end of the universal joint 4 is inserted into the input shaft 21. It is locked by a rear pin or the like. The front end of the universal joint 4 is locked with a pin or the like after engagement with a PTO shaft 22 provided at the rear end of the agricultural tractor 2, and the input shaft 2 is driven by an engine (not shown).
1 can be driven. A mast 23 is provided above the upper transmission case 20.
The upper hanger pin 24 is attached to the upper end of the mast 23 at the center in the left-right direction. Side mounting plates 25, 25 are provided on both left and right sides of the upper transmission case 20, and lower hanger pins 26, 26 are mounted on the front ends of the side mounting plates 25, 25. Since the rotary tilling implement shown in FIG. 1 is a side drive rotary, the driving force transmitted to the upper transmission case 20 reaches the cultivation shaft 28 via the side case 27, and the cultivation blade 29 attached to the cultivation shaft 28,
29. . . Till the topsoil by drilling. Reference numeral 30 denotes a gauge wheel, which adjusts the tilling depth by rolling and adjusting up and down the uncultivated ground before tilling excavation. Thus, the three upper hanger pins 24 and the left and right lower hanger pins 26, 2 provided in front of the agricultural work machine 3 are provided.
The operation of the quick hitch 1 attached to the three-point link of the agricultural tractor 2 that can move up and down will be described with respect to FIG. The agricultural tractor 2 is moved backward, and the quick hitch 1 is raised while the groove of the upper hanger 10 of the quick hitch 1 is hooked on the upper hanger pins 24 of the agricultural work machine 3 placed on the ground. As the quick hitch 1 rises, the left and right lower hanger pins 26 of the agricultural work machine 3 are pressed against the receiving grooves 12 of the quick hitch 1 by their own weight, and the agricultural work machine 3 comes into close contact. When the contact state is established, the hook 13 is manually or automatically pressed by a spring pressure described later, and the lower hanger pins 26, 26 are fixedly integrated. When the agricultural machine 3 moves forward and downward around the center of the upper hanger pin 24, the input shaft 2
1 is automatically inserted into and engaged with the outer end spline hole 5 of the universal joint 4, as will be described in detail later. The universal joint 4 is also called a universal joint, and has a joint 31 such as a cross joint at both ends.
A transmission joint having a spline shaft and a hole, the middle portion of which is engaged with the PTO shaft 22 as described above, and the rear end of which is a central side plate of the quick hitch 1. 1
The front and rear end portions are positioned even if the overall length is changed by the raising / lowering operation of the quick hitch 1, being locked to one of the perspective locking portions 6 and 7 provided at the portions 5 and 15. Both ends of the universal joint 4 are formed with spline holes, into which spline shaft portions such as the PTO shaft 22 of the agricultural tractor and the input shaft 21 of the agricultural work machine 3 are inserted to transmit the driving force. . In the illustrated example, a bearing 32 is provided in an outer end spline hole 5 which is a rear end of the universal joint 4.
A cylindrical body 33 is attached via the cylindrical body 33. Pins 34, 34 project from the cylindrical body 33 on both left and right sides.
4 and 34 are attached to one of the perspective locking portions 6 and 7 of the central side plates 15 and 15. A stay 35 is integrally welded to the pin 34 projecting outward from the center side plate 15, and the input shaft 21 of the agricultural work machine 3 is engaged with the outer end spline hole 5 as shown in FIG. The position of the stay 35 is indicated by a solid line, and when the agricultural work machine 3 is removed, the pin 34 is formed by the own weight of the universal joint 4 and the joint 31 so that the pin 34 can As the tip of the stay 35 comes into contact with the positioning tool 36 provided on the central side plate, the posture of the tubular body 33 is raised backward (virtual line 33a) while falling to the lower end.
The chamfered portion 50 at the front end of the input shaft 21 facilitates the insertion of the input shaft 21 into the outer end spline hole 5 in the cylindrical body 33 at the time of one-touch engagement. Although not shown, if an adjuster is provided between the pin 34 and the stay 35 or between the stay 35 and the positioning part 36, a best position of the outer end spline hole 5 can be obtained. . Reference numeral 37 denotes a cover, which is made of an elastic resin or the like, and is a safety cover that covers the outer periphery of the universal joint 4. FIGS. 1 and 2 show a state in which the far locking portions 6 of the central side plates 15 and 15 are used, and FIGS. 4 and 5 show a state in which the near locking portions 7 are used. The remote locking portion 6 is a standard of the Japan Agricultural Machinery Manufacturers Association, and is abbreviated as "Japan Agricultural Engineering Standard", and is determined mainly by a working machine maker. This "Japan Agricultural Standard"
Is a rough approximation, and quick hitch dimensions below 50 horsepower are. . . . And above. . . . The classification is coarse. In the installation of the agricultural working machine 3 according to the "Japan Agricultural Standard" in FIG. 2, the distance from the center of the rear wheel 49 of the agricultural tractor 2 to the center of the cultivating shaft 28 is very long. Since the uncultivated land is widened and the work efficiency is not improved, or the heavy agricultural work machine 3 is mounted overhanging rearward, the front wheels are lifted up, making it difficult to steer. Therefore, in order to bring the agricultural work machine 3 as close as possible to the agricultural tractor 2, the mast 23 is briefly described.
And an "operable type standard" in which the amount of forward projection of the side mounting plate 25 is shortened. This means that if the upper transmission case 20 is the same size, the input shaft 21 of the agricultural work machine 3 moves forward. For this reason, the conventional quick hitch cannot be mounted due to the small amount of sliding of the universal joint in the front-rear direction.
The tilling shaft 28 could be moved toward the agricultural tractor 2 side. As shown in the side view of FIG. 5, the perspective locking portions 6 and 7 have upper and lower horizontal grooves 6a and 7a at the upper end, and move the position of the cylindrical body 33 in the perspective direction when it is difficult to meet the standard. It is possible to prevent the cylinder 33 from dropping due to vibration during traveling without attaching the agricultural work machine 3 or to close the cylinder 33 close
It is configured to be guided to drop to the unit 7. Also, the lower end position of the grooves of the perspective locking portions 6 and 7 is lowered downward as it approaches the two agricultural tractors, and in consideration of sharing parts and improving front-rear balance when the "driving standard" is adopted. I have. Next, the area around the hook 13 of the quick hitch 1 will be described. At the lower front portion of the top link mounting frames 9, 9 projecting upward in the left-right direction of the base frame 8 made of a pipe material having a lower opening mountain shape, a left-right shaft 3 of a lever 38 is provided.
9 is attached, and the swing fulcrum 4 which is juxtaposed with the shaft 39
A central upper portion of a left and right connecting arm 41 to be described next is pivotally mounted to the zero portion in a free-rotating manner. The left and right connecting arms 41 have a lower opening
Fig. 3 and Fig. 6
The lower end is inserted into the retaining ring 43 of the hook 13 while holding the pressure springs 42, 42 as shown by. 4
Reference numerals 4 and 45 denote upper and lower washers, an upper washer 44 is fixed to the left and right connecting arm 41, and a lower washer 45 is vertically movable. Reference numeral 46 denotes a roll pin, which is driven into the lower end of the left and right connecting arm 41. The hook 13 is moved upward by the upward movement of a lever 38, which will be described later, to open the rear of the receiving groove 12 provided in the lower side plate 11. I do. At the front end of the lower side plate 11, a plurality of mounting holes 47, 47. . The rear pin 4 of the lower link 17 is inserted into any one of the mounting holes 47.
8 is attached. The position of the rear pin 48 is changed depending on the size of the agricultural tractor 2, but a plurality of mounting positions are provided for common use. 3 and 6 show a state in which the hook 13 is lowered and the rear part of the receiving groove 12 is closed. Here, when the lever 38, which has been leaned downward, is lifted in the direction of the arrow “a” and turned until it comes into contact with the upper surface of the base frame 8, the lever 3
Reference numeral 8 denotes a position indicated by an imaginary line, the swing fulcrum 40 changes to an upper swing fulcrum 40a, and the left and right connecting arms 41 are moved upward to open the hooks 13. When removing the agricultural work machine 3 from the quick hitch 1, the manual operation is performed to remove the agricultural work machine 3. When attaching the agricultural work machine 3 to the quick hitch 1, the hook 13 is opened as described above. When the machine 3 is attached, even if the hook 13 is closed, the lower hanger pin 26 causes the hook 13 to push the hook 13
Then, it is automatically opened and fits in the receiving groove 12. After the lower hanger pin 26 is locked, the lower hanger pin 26 is
Even if it tries to come off from the two parts, it does not come off because the load of the pressure spring 42 increases. The lever 38 is moved beyond the fulcrum by the pressurizing spring 42 as the lever 38 is turned up and down, and the lever 38 is clearly pressurized and fixed at the upper position to prevent noise from being generated during traveling. I have. According to the present invention, the following technical effects can be obtained by the above configuration. That is, a pair of left and right plates 15, 15 is provided below the hitch frame 1.
In a far-locking groove 6 for positioning the perspective position and vertical position of the cylinder 33 relative to the tractor 2, positioned to a different perspective position and height from the far locking groove 6 of the same tubular body 33 Kinkakaritome Since the groove 7 is provided, it is possible to mount the agricultural working machine 3 having different heights of the input shaft and front and rear positions, and
A groove in the front-rear direction for guiding the cylindrical body 33 dropped between the two grooves 6 and 7 to an upper portion of the near locking groove 7.
Since the portion 7a is formed , the cylindrical body 33 is removed from the remote locking groove 6.
When moving to Kinkakaritomemizo 7, perspective locking the cylindrical body 33
It is only to be located in between the grooves 6, 7 Ru can be performed easily repositioned.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view. FIG. 2 is an overall side view. FIG. 3 is a front view of a quick hitch portion. FIG. 4 is a plan sectional view of a rear end portion of a universal joint, which is a main part. FIG. 5 is a partially sectional side view of FIG. 4; FIG. 6 is a side view of FIG. 3;

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshio Takechi 660 Takubo, Shigenobu-cho, Onsen-gun, Ehime Pref. Inside the Shigenobu Plant of Yamamoto Manufacturing Co., Ltd. (56) References JP-A-2-128610 (JP, A) JP-A JP-A-63-291506 (JP, A) JP-A-4-316417 (JP, A) JP-A-58-192507 (JP, U) JP-A-54-115302 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) A01B 59/043 A01B 71/02

Claims (1)

(1) A top link of a three-point link mechanism and a pair of left and right lower links are connected to a rear portion of the agricultural tractor. The hitch frame 1 is provided at the rear connection portion of the lower link 17 of the lower link 17, and the upper engaging portion 10 and the left and right lower engaging portions 13, 1 of the hitch frame 1 are provided.
3 is a cylinder having a spline hole 5 for engaging the upper part and the left and right lower part of the work machine 3 with the lower part of the hitch frame 1 while engaging and connecting the upper part and the lower part of the work implement 3 with the universal joint 4 for transmission on the tractor 2 side. through the body 33, the working machine coupling device for transmitting to the working machine 3 side of the input shaft 21, the bottom of the hitch frame 1, a pair of left and right plates 15, 15 provided on the plate 15, 15, the The cylinder 33 is dropped while being locked, and
With different perspective and lower positions relative to
Two perspective locking groove 6 in the downward direction is provided, among the perspective locking groove 6, near engagement near the tractor 2 side
The cylindrical body 33 dropped between the grooves 6 and 7 is inserted into the stop groove 7.
A working machine coupling device, wherein a front-back groove 7a for guiding to the upper part of the near locking groove 7 is formed .