JPS63173501A - Hitch apparatus of tractor and working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a coupling device for a tractor and a working machine.

(Prior Art) For example, when connecting a rotary tiller to a tractor via a three-point link mechanism, the lower link of the three-point link mechanism and the tiller can be easily connected and disconnected. For this reason, some cultivating devices are equipped with a connecting shaft at the tip of the lower link, and an engaging portion with which the connecting shaft is removably engaged.

In the above-mentioned device, the retaining body is swingably provided in the engaging portion, and the retaining body removably engages with the connecting shaft, thereby allowing the connecting shaft to separate from the engaging portion. The position can be freely changed between a retaining position that prevents the coupling shaft from coming off, a removal position where the coupling shaft is disengaged from the coupling shaft and the coupling shaft is allowed to separate from the engagement portion, and an engagement permitting position. When the connecting shaft body is engaged in the engaging part, the retaining body is set to the engagement permissible position, and the connecting shaft body engages in the engaging part while swinging the retaining body, and the retaining body Change the position to the locking position.

By the way, in the above-mentioned device, in order to prevent the retaining body from accidentally swinging from the retaining position, a restraining member is provided that releasably holds the retaining body at the retaining position.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, the restraining body and the retaining body are not interlocked at all, and therefore, when the connection between the connecting shaft body and the engaging portion is released, first, After operating the restraining body to release the retention of the retaining body by the restraining body, it is necessary to operate the retaining body completely separately and move the retaining body to the removal position, so that it does not engage with the connecting shaft body. There was a problem in that it was not easy to disconnect from the other parts.

An object of the present invention is to provide a coupling device for a tractor and a working machine that can solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention is that the connecting shaft body 15 is attached to one of the connecting link 10 of the tractor 1 and the work 151R, and the connecting shaft is attached to the other side. Each engagement portion 23 is provided with which the body 15 is removably engaged, and the engagement portion 23 is provided with a retaining body 36 so as to be swingable. The engaging portion 2 of the connecting shaft body 15 is removably engaged.
3, a removal position where the engagement with the connecting shaft 15 is released and the connecting shaft 15 is allowed to separate from the engaging portion 23, and an engagement permitting position. When the connecting shaft body 15 is engaged with the engaging portion 23, the retaining body 36 is set to the engagement allowable position, and the connecting shaft body 15
is engaged with the engaging portion 23 while swinging the retaining body 36, and the retaining body 36 moves to the retaining position, in which the retaining body 36 can be freely engaged with and disengaged from the engaging portion 23. A restraining member 43 that engages and releasably holds the retaining body 36 at a retaining position is swingably provided.
An interlocking part 46 is provided which changes the position of the retaining body 36 from the retaining position to the removal position by swinging the restraining body 43 when disengaging from the retaining body 43.

(Function) When connecting the tractor 1 and the work machine R, the check system 43
is set to the release position, and the retaining body 36 is set to the engagement allowable position.

Then, the retaining body 36 is swung by the connecting shaft 15 and engaged with the engaging portion 23 to move the retaining body 36 to the retaining position, and the restraining body 43 is engaged with the engaging portion 23. At the same time, the retaining body 36 is held at the retaining position.

Next, when separating the tilling device R from the tractor L,
The check member 43 is operated to swing to release the engagement with the engagement portion 23, and the check member 43 changes the position of the retaining member 36 from the retaining position to the removal position via the interlocking portion 46. .

Then, the connecting shaft body 15 is separated from the engaging portion 23.

(Embodiment) An embodiment of the present invention will be described below based on the drawings. In FIG. 2, 1 is a tractor, 2 is a tractor body, and 3 is a lifting device mounted on the rear of the tractor body 2. This is a hydraulic system for lifting and lowering work equipment, and has a pair of left and right lift arms 4. 5 is a seat, 6 is a rear wheel, and 7 is a PTO shaft, which protrudes rearward from the rear end of the vehicle body 2.

Reference numeral R denotes a side drive type rotary tiller, which is exemplified as a working machine, and is connected to the rear of the tractor 1 via a three-point linkage mechanism 8 so as to be movable up and down and detachable.

The three-point link mechanism 8 consists of a top link 9 shown as a single upper link in the center and lower links 10 shown as a pair of left and right lower links, and each lower link 10 and each lift arm 4 are connected to a lift rod 11, respectively. are connected by.

As shown in FIGS. 3 and 4, reference numeral 12 denotes a connecting body, which includes the working machine side ends of the top link 9 and both lower links 10,
That is, a cylindrical main body 13 that connects the rear end portions and has a mountain shape in front view that projects upward, and a pair of left and right cylindrical bodies that project upward and diagonally rearward from the upper end of the center portion of the main body 13 in the left-right direction. It is comprised of a side plate 14, a pair of left and right connecting shaft bodies 15 protruding outward from both left and right end portions of the main body 13, and the like.

A rear end portion of the top link 9 is removably connected between the front portions of the left and right side plates 14 by a mounting pin 16. A notch 17 opening diagonally upward and rearward is formed at the rear of each side plate 14, and the upper part of the notch 17 gradually widens toward the upper end.

As shown in FIG. 7, the ball joint part 18 of each lower link 0 is removably fitted onto each connecting shaft body 15, and a hollow truncated conical side that prevents the ball joint part 18 from coming off. A section guide body 19 is detachably attached, for example, by screws, with the small diameter end face facing outward.

The tilling device R includes an input case 20 located at the center in the left and right direction of the upper front part thereof, and a top mast 2 that projects obliquely forward and upward from the input case 20 and consists of a pair of left and right side plates.
1, a pair of support arms 22 protruding from the input case 20 in the left and right sides, and a pair of left and right lower joint parts 2 protruding forward from the middle part of each support arm 22 in the left and right direction.
3, a transmission case 24 and a side plate lowered from the outer end of each support arm 22, and a tilling shaft and a tilling shaft, which are horizontally suspended between the lower ends of the transmission case 24 and the side plate, and are rotatably driven. The tilling section 25 includes a tilling section 25 consisting of a large number of tilling claws, a tilling cover 26 that covers the tilling section 25, a tilling depth adjustment mechanism 27, and the like.

The input case 20 is equipped with an input shaft 28 that projects forward, and this input shaft 28 is connected to the PTO shaft 7 of the tractor 1.
They are releasably connected via a universal joint shaft 29 and a clutch device 30. A clutch device 30 is provided on the coupling body 12.

Between the upper ends of both side plates of the top mast 21, an upper body joining part 31, exemplified by a bottle, is provided in the left-right direction, and the notch 17 of the connecting body 12 is engaged with and detached from the lower side of this upper body joining part 31. They are freely engaged, that is, they are fitted in and out.

As shown in FIG. 1, FIG. 5 to FIG.
2.33, and a fitting recess 34 in which the connecting shaft 15 is removably engaged is formed in the front part of these side plates 32,33. Note that the upper part of the inner plate 32 projects further forward than the outer board 33, and the lower part of the outer board 33 projects further forward than the lower part of the inner board 32. Further, a locking step portion 35 is formed at the lower front end portion of the outer plate 33.

36 is a curved retaining body, which is attached to the inner and outer image side plates 32 and 33.
The retaining body 36 is disposed between the left and right support shafts 37 to be swingable, and as shown in FIG. As shown in FIG. As shown in FIG.
The position can be freely changed to an engagement permitting position that permits engagement with 3. On the lower front surface of the retaining body 36, a cam surface 38 which is inclined forward and upward is formed in the form of a curved fin.

An interlocking lever 39 located on the outside of the outer plate 33 is lowered at the outer end of the support shaft 37, and when the retaining body 36 is in the engagement allowable position, the interlocking lever 39 engages with the support arm 22. It is in contact.

Reference numeral 40 denotes a first switching spring, which includes a hook shaft 41 fixed to the upper part of the outer plate 33 and a hook shaft 42 fixed to the interlocking lever 39.
This first switching spring 40 is interposed elastically between the
The retaining body 36 can be unstably switched between a retaining position or an engagement permitting position and a removal position.

Note that when the retaining body 36 is in the removal position, the retaining body 36 comes into contact with the hook shaft 41.

Reference numeral 43 denotes a restraint member, which is swingably provided in the front part of the retaining member 36 by a support shaft 44 in the left and right direction, and is located on the outer side of the outer plate 33. A locking shaft 45 is fixedly provided, and an interlocking portion 46, exemplified by a pin in the left and right direction, is fixedly provided at a midway portion in the longitudinal direction.

The restraining body 43 is placed in a holding position where the locking shaft 45 is removably engaged with the locking step 35 of the outer plate 33, as shown by the solid line in FIG. As shown, the engagement between the locking shaft 45 and the locking stepped portion 35 is released, and the interlocking portion 46
can be freely changed to a released position where it engages with a locking step 47 on the front upper surface of the retaining body 36.

By setting the restraint body 43 to the holding position, the retaining body 36
is held in the locking position.

Reference numeral 48 denotes a second switching spring, which is elastically interposed between a hook shaft 49 fixed to the front part of the retaining body 36 and a hook shaft 50 fixed to the restraint body 43, and is elastically inserted between the hook shaft 49 fixed to the front part of the retaining body 36 and the catch shaft 50 fixed to the restraint body 43. , unsteadily switching between the holding position and the release position.

According to the embodiment configured as described above, when the tilling device R is connected to the tractor 1, the tilling device R is placed on the ground and tilted slightly forward as shown in FIG. . Further, as shown in FIG. 6, the restraint member 43 is set at the release position, and the retaining member 36 is set at the engagement permitting position.

In this state, the tractor I is moved backward to approach the tilling device R, and as shown in FIG. 17 and each connecting shaft body 15 are positioned respectively.

Next, the three-point link mechanism 8, the connecting body 12, and the clutch device 30 are gradually raised by the hydraulic device 3, and the upper body joining part 31 is first engaged in the notch 17 of the connecting body 12. In this state, each connecting shaft body 15 is connected to each lower body connecting portion 23.
It is located on the front side.

Then, when the three-point link mechanism 8, the connecting body 12, and the clutch device 30 are further raised, the upper body joining part 31 is engaged in the notch 17 of the connecting body 12, so that the three-point link mechanism 8 and the like, the tilling device R is lifted and rotated around the upper body joining portion 31 toward the tractor 1 side, that is, toward the front side.

As a result, as shown in FIG. 6, each connecting shaft body 15 comes into contact with the cam surface 38 of the retaining body 36, causing the retaining body 36 to swing upward together with the restraining body 43, while the lower body It is removably engaged in the fitting recess 34 of the portion 23, and the retaining body 3
6 moves to the retaining position due to its own weight and the first switching spring 40.

In the above case, even if the connecting shaft body 15 deviates from the normal movement path in the left-right direction, the outer surface of each side guide body 19 and the inner plate 32 of each lower body joining part 23 can slide relative to each other. As a result, the position of each connecting shaft body 15 is corrected to the normal movement path.

Next, the restraint member 43 of each lower body joint 23 is unstablely switched to the holding position, and the clutch device 30 is operated to control the tractor 1.
The PTO shaft 7 of the tiller R is connected to the input shaft 28 of the tilling device R.

As described above, the connection work of the tilling device R to the tractor 1 is completed.

Next, when separating the tilling device R from the tractor 1,
The operation is performed in the reverse order to the above, and first, the clutch device 30 is operated to disconnect the PTO shaft 7 of the tractor 1 and the input shaft 28 of the tilling device R.

Next, the restraining member 43 is rotated counterclockwise in FIG. 1 to bring it to the release position as shown by the imaginary line in the figure, and is further rotated, so that the interlocking portion 46 is controlled by the restraining member 43. Then, the retaining body 36 is rotated counterclockwise to unstablely switch it to the removal position.

In this state, the tilling device R is lowered by the hydraulic device 3 via the three-point link mechanism 8 and the connecting body 12, and the tilling portion 25 of the tilling device R is brought into contact with the ground.

Then, when the three-point linkage mechanism 8 and the connecting body 12 are further lowered, the tilling device R is tilted forward, and first, each of the lower body joining parts 23
Each of the connecting shafts 15 of the connecting body 12 is detached from the connecting body 12, and then the upper body joining part 31 is detached relatively upwardly from the notch 17 of the connecting body 12, and the tilling device R is separated from the tractor 1. ends.

In the embodiment, the retaining position and the engagement permitting position of the retaining member are different positions, but they may be the same position.

Further, in the embodiment, the connecting link is provided with the connecting shaft body, but the connecting link may be provided with an engaging portion.

Further, in the embodiment, a rotary tiller is used as the working machine, but a work machine other than the rotary tiller may be used.

Further, in the embodiment, the working machine is attached to the tractor via a three-point linkage mechanism, but the working machine may be attached to the tractor via a two-point linkage mechanism.

Furthermore, the present invention is also applicable to a device for connecting a working machine to the front side of a tractor.

(Effects of the Invention) As described in detail above, according to the present invention, when the connecting shaft body and the engaging portion are disconnected, the check body and the engaging portion are disengaged by the swinging operation of the check body. The operation and the repositioning operation of changing the position of the retaining body from the retaining position to the detaching position can be performed, and the connection between the connecting shaft body and the engaging portion can be easily released.

The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially sectional side view of the main parts, FIG. 2 is an overall side view, and each of FIGS. 3 and 4 shows a connecting body showing different operating positions. 5 and 6 are partially sectional side views of the main parts showing different operating positions, and Fig. 7 is a partially exploded plan view of the main parts. . DESCRIPTION OF SYMBOLS 1... Tractor, 10... Lower link (connection link), 15... Connection shaft body, 23... Lower body joining part, 36
... Retaining body, 43... Checking body, 46... Interlocking part, R... Rotary tilling device (work machine). Fig. 3 4 Fig. 75i , -1゛・,ノ“ ◇ ,.

Claims (1)

[Claims] (1) One of the connecting link 10 of the tractor 1 and the working machine R is provided with the connecting shaft 15, and the other is provided with the engaging portion 23 to which the connecting shaft 15 is removably engaged. A retaining body 36 is swingably provided in the portion 23, and the retaining body 36
a retaining position that removably engages with the connecting shaft 15 to prevent the connecting shaft 15 from coming off the engagement portion 23;
The position of the connecting shaft body 15 inside the engaging part 23 can be freely changed between a removal position where the engagement with the connecting shaft body 15 is released and the engagement part 23 is released, and an engagement permitting position. When the retaining body 36 is engaged with the engagement portion 23, the retaining body 36 is set to the engagement allowable position, and the connecting shaft body 15 engages with the engaging portion 23 while swinging the retaining body 36, and the retaining body 36 is not pulled out. In the device that moves to the locking position, a restraining body 43 that releasably engages the locking body 36 with the engaging portion 23 to releasably hold the locking body 36 in the locking position.
is provided in a swingable manner, and when the check member 43 is disengaged from the engaging portion 23, the retaining member 36 is attached to the check member 43 by swinging the check member 43.
Interlocking part 4 that changes the position from the retaining position to the removing position
6. A coupling device for a tractor and a working machine, characterized in that the device is provided with: 6.