JP5157853B2 - Tractor work equipment coupling device - Google Patents

Description

  The present invention relates to a connection device for a work machine to be mounted on a rear portion of a tractor.

Conventionally, for example, as shown in Patent Document 1, a technique in which an auto hitch is configured in a 2P link device to facilitate the mounting of a work machine is known (Patent Document 1).
In this Patent Document 1, a transmission shaft yoke is provided between a transmission shaft that detachably connects a PTO shaft on the tractor side and an input shaft on the work implement side, and a work implement coupling body that constitutes an auto hitch. A configuration that facilitates automatic connection of the transmission shaft by lifting and supporting the connecting side with the joint upward is disclosed.
JP 2006-109738 A

  In the configuration of the prior art, the spring member provided in a suspended shape from the fixed member side is directly connected to the support cover member of the transmission shaft. Therefore, when the transmission shaft is attached and detached together with the support cover member, the spring member is attached and detached. There is a difficulty in maintainability, such as having to do.

  The object of the present invention is to improve the maintainability such as attachment / detachment of the transmission shaft that transmits the tractor side PTO shaft and the work implement side input shaft when the auto hitch is configured in the 2P link device, and to solve the conventional problems. It is in.

In order to solve the above problems, the present invention has taken the following technical means.
That is, according to the first aspect of the present invention, a hitch frame 10, 10 that pivots up and down with respect to the tractor 1 is provided in the tractor work machine coupling device in which the work machine 2 is detachably attached to the rear part of the tractor 1. A work machine connection frame 26 is integrally provided on the frames 10, 10, and is attached to and detached from the PTO shaft 20 at the rear part of the tractor 1 by a joint cover 45 that is detachably attached to the work machine connection frame 26 and is vertically rotatable. An attachment / detachment transmission portion 24 including a universal joint 22 that is freely connected and an intermediate shaft portion 23 that is detachably connected to the input shaft 21 on the work machine 2 side is supported, and the joint cover 45 is attached to the hitch frame 10 or the work. The tractor is characterized in that the universal joint 22 side is biased and supported upward by a holding mechanism 30 that is pivotable up and down with respect to the machine connecting frame 26 and biased upward. The configuration of the machine coupling device.

  With the above configuration, since the joint cover 45 is held by the holding mechanism 30 when the work machine 2 is not connected, the joint cover 45 is connected to the work machine together with the universal joint 22 and the intermediate shaft portion 23. It is removed from the locked state with the frame 26 and pulled out in the front-rear direction.

  According to a second aspect of the present invention, in the first aspect, the holding ring 46 is provided on the intermediate shaft portion 23 via the bearing 44 fitted to the outer periphery, and the locking bodies 47 and 47 are provided on the outer left and right sides of the holding ring 46. The retaining ring 46 is attached to the latch pins 48, 48 protruding toward the inside of the hitch frames 10, 10 or the work machine connection frame 26 so as to be detachable and swingable upward. The joint cover 45 is fixed to the front, and the joint cover 45 is held by the holding mechanism 30. The holding mechanism 51 is configured to protrude from the side surface of the joint cover 45 in the horizontal direction. A holding frame which is provided so as to be rotatable about a horizontal axis with respect to the hitch frames 10 and 10 or the work machine connection frame 26 and can hold the holding pins 51 and 51 by an intermediate portion 53a which is shaped like a side view. And 3, and the holding frame 53 consists of I 54 the tension is engaged to the left and right connecting portions 53b of the holding frame 53 so as to urge upward configuration.

  If comprised in this way, the joint cover 45 can be removed, leaving the holding frame 53 toward the open | release side of the type | mold seen from the side.

  According to the first aspect of the present invention, since the joint cover 45 is held by the holding mechanism 30 when the work machine 2 is not connected, the joint cover 45 is attached to the universal joint 22 or the intermediate shaft portion 23. At the same time, it can be removed from the locked state with the work machine connection frame 26 and pulled out in the front-rear direction, and it is not necessary to remove the holding mechanism 30 and the spring 54 as the urging means, so that the maintenance of the universal joint 22 and the intermediate shaft portion 23 is eliminated. Work is quicker.

  Further, according to the invention described in claim 2, in addition to the effect described in claim 1, the configuration of the holding mechanism 30 can be simplified and implemented at low cost.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a state in which a rotary work machine 2 as an example of a work machine is mounted on a tractor 1. An engine E is mounted in the bonnet 3 at the front of the tractor 1, the rotational power of the engine E is transmitted to the transmission in the transmission case 4, and the rotational power shifted by the transmission is transmitted to the rear wheels 5 and the front wheels 6. It is configured to transmit to. A hydraulic cylinder case 7 is provided above the rear part of the transmission case 4, and lift arms 8, 8 are pivotally mounted on the left and right outer sides of the hydraulic cylinder case 7, and are attached to brackets 9, 9 provided at the rear part of the machine body. Lift rods 11, 11 are interposed between the pair of hitch frames 10, 10 and the lift arms 8, 8, and the rotary work machine 2 is configured to move up and down by driving the lift arms 8, 8 up and down.

  The hitch frames 10 and 10 have a U-shaped connection in which an L-shaped mounting portion 10b is integrated with the front end of the frame main body 10a, and a connecting cylindrical shaft 12 provided between the frame main body 10a and the L-shaped mounting portion 10b is provided in the bracket 9. It is the structure which engages with the part 9a and is connected with the locking pin 9b so that vertical rotation is possible.

The steering handle 15 is configured such that the left and right front wheels 6 and 6 are steered left and right by a left and right turning operation, and a driver's seat 16 is provided behind the steering handle 15.
A PTO shaft 20 is provided so as to protrude rearward from the rear portion of the tractor 1, and a universal joint 22 and an intermediate shaft portion 23 described later are provided between the PTO shaft 20 and the input shaft 21 of the rotary work machine 2. A detachable transmission unit 24 is provided.

  The hitch frames 10 and 10 include a work machine connection frame 26, the attachment / detachment transmission unit 24 is held on the work machine connection frame 26, and the attachment / detachment transmission unit is interlocked with the vertical movement of the work machine connection frame 26. A so-called auto hitch 24 connects the PTO shaft 20 and the input shaft 21 in a transmission state.

  The work machine connection frame 26 includes an upper hook 27, lower hooks 28 and 28, lock claws 29 and 29, a holding mechanism 30 that holds the detachable transmission portion 24, and the like. In detail, an upper hook 27 at the upper center is provided between the hitch frames 10 and 10 and the main frames 10a and 10a. The upper hook 27 is connected to the upper end of the top mast 31 of the rotary tiller 2 by a connecting pin. 32 can be engaged. Further, lower hooks 28, 28 are provided at the outer ends of the lower left and right cylinder frames 33, 33, and the rear sides of the hooks 28, 28 are opened so that the transmission case 33 disposed at the center of the left and right of the rotary tiller 2. A configuration in which the locking pins 34, 34 provided on both sides can be engaged, and a locking claw 29, 29 that is rotatably provided and urged in the locking direction can lock the engagement locking state. It is said. The lock claw 29 is urged to normally close the opening 28a of the lower hook 28, and the opening of the opening 28a is placed in a released state by moving the lever 35 over a fulcrum by switching the lever 35.

  Reference numeral 36 denotes an inverted Y-type connecting reinforcement frame that connects the rear end sides of the left and right hitch frames 10 and 10 to the left and right, and 37 connects the rear lower ends of the left and right hitch frames 10 and 10 and extends to the left and right to extend the lower hook 28. , 28 is a reinforcing pipe connected to 28 parts to form a reinforcing structure, and the center is bent downward. A space 38 surrounded by the left and right hitch frames 10, 10, the connecting reinforcing frame 36 and the reinforcing pipe 37 is formed.

  Next, the attachment / detachment transmission portion 24 that attaches / detaches between the PTO shaft 20 and the input shaft 21 so as to allow transmission between them will be described in detail with reference to the drawings. The detachable transmission portion 24 includes a universal spline 22 including front and rear yokes 40f and 40r each having a female spline and a yoke joint 40j that flexibly connects them, and a rear spline 40r of the universal joint 22 with a male spline. A connecting shaft 42 to be fitted with, an intermediate shaft portion 23 formed by a cylindrical shaft 43 formed in a female spline 43a at the rear portion of the connecting shaft 42 and having an axial center aligned, and a bearing provided on the outer periphery of the intermediate shaft portion 23 A cylindrical joint cover 45 or the like held via 44. Locking bodies 47, 47 are provided on the outer periphery and left and right of the holding ring 46 of the bearing 44, and the locking bodies 47, 47 have an inverted U shape that is released on the lower side, and face toward the rear inner side of the hitch frames 10, 10. The protruding short shaft locking pins 48, 48 are dropped from above and mounted on the locking pins 48, 48 so as to be swingable up and down. A joint cover 45 is fixed to the holding ring 46 toward the front, and is provided so as to be able to swing up and down around the horizontal axis around the locking pin 48.

  Further, the holding mechanism 30 for lifting the joint cover 45 upward and holding the joint cover 45 so as not to become below a certain level includes holding pins 51 and 51 protruding from the reinforcing member 50 in the horizontal direction, and locking pins 48 and 48 of the short shaft. The holding pins 51, 51 are held by an intermediate portion 53a which is locked to the left and right support holes 52, 52 opened in the hitch frames 10, 10 so as to be pivotable about a horizontal axis and has a rectangular shape. And a tension spring 54 engaged with the left and right connecting portions 53b to urge the holding frame 53 upward.

  A stopper plate 55 is provided so as to protrude forward from the holding frame 53 and is configured to restrict the upward movement of the holding frame 53 by appropriately contacting the stopper member 56 fixed to the hitch frames 10 and 10. Reference numeral 57 denotes an adjustment bolt that can finely adjust the contact position of the stopper plate 55 in the vertical direction.

  The work machine connection frame 26 and the intermediate shaft part 23 configured as described above attach the rotary tiller 2 as a work machine to the rear part of the tractor while acting as follows. That is, the lever 39 is operated to maintain the opening 28a in the open state, and the tractor 1 is approached from the front side to the rotary tiller 2 in the ground fixed posture. After approaching the predetermined position, the lift arm 8 is operated so that the upper hook 27 is lifted up from below by the connection pin 32 of the work machine connection frame. When 2 is pulled up, the connecting pin 32 is fitted into the lower hooks 28 and 28, and simultaneously, the unillustrated spring which holds the locking claw 29 over the fulcrum and holds the opening posture is returned to switch to the locked state.

  During this time, the joint cover 45 of the attaching / detaching transmission portion 24 is supported in a state of being urged by the holding mechanism 30 in a predetermined state. For example, the shaft core extension line of the connecting shaft 42 is in the side view when the hitch frame 10 is viewed. The front side of the joint cover 45 is held in a slightly higher state in the direction of passing through the vertical pivot axis, which is a pivotally attached portion between the bracket 9 and the bracket 9. Therefore, as the rotary tiller 2 is approached, the front PTO shaft 20 is fitted into the front yoke 40f, and the rear input shaft 21 is fitted into the connecting shaft 42. The shift is absorbed by the rotation of the locking body 47 that supports the joint cover 45 and the locking pin 48 and gradually fits into a normal state.

  The universal joint 22 and the intermediate shaft portion 23 together with the joint cover 45 are held by the holding mechanism 30, but the holding frame 53 of the holding mechanism 30 is formed with the holding pins 51, 51 of the joint cover 49 as a mold. Since it is held by the intermediate portion 53 a of the holding frame 53, it is pulled out rearward while leaving the holding frame 53 and the tension spring 54 toward the space portion 38 in the illustrated example, one on the front and rear sides from the locking pin 48. And maintainability can be improved.

  A leaf spring may be used instead of the tension spring. Further, a resin cover may be attached to the front side of the joint cover 45 to cover the yoke 40 and the yoke joint 41.

  FIG. 9 shows an alternative improved configuration of the upper hook. A bracket 61 is provided at the upper center of the work machine connection frame 60, and a transfer member 63 that can be mounted by being turned up and down with a rotation center 62 on the bracket 61 is provided. A hook 63A and a hook 63B having different distances are formed. Further, the lift rod connecting pin 66 to be connected between the lift arm 64 and the hitch frame 65 is provided with an auxiliary connecting member 67, and the lift rod connecting pin via the rod 68 in conjunction with the up and down change of the transfer member 63. The height of 66 can be changed.

  When configured in this manner, the upper hook 63A can be used for a standard model with a high top mast on the work machine side (FIG. 9 (C)), and the upper 2D link mechanism with a lower height when the upper hook 63B is used. Can be used with work machines equipped with the same (b). Further, by changing the effective length of the lift rod in accordance with this change, and further providing a limit on the height of the work implement, various work implement specifications can be accommodated.

Side view of the main part of the tractor Perspective view of main part of work machine coupling device Partial sectional view of the main part Plan view of main parts of work equipment coupling device Partial sectional view of the main part Partial side sectional view of the main part of the work equipment coupling device Rear view of work equipment coupling device Side sectional view of the detachable transmission section Plan view showing another example of the upper hook (A), side view of the first posture (B), side view of the second posture (C)

Explanation of symbols

1 Tractor 2 Rotary tillage work machine (work machine)
DESCRIPTION OF SYMBOLS 10 Hitch frame 20 PTO shaft 21 Input shaft 22 Universal joint 23 Intermediate shaft part 24 Detachable transmission part 26 Work machine connection frame 30 Holding mechanism 44 Bearing 45 Joint cover 46 Holding ring 47 Locking body 48 Locking pin 51 Holding pin 53 Holding frame 54 Tension spring

Claims (2)

  A hitch frame (10, 10) that pivots up and down with respect to the tractor (1) is provided in a tractor work machine coupling device in which the work machine (2) is detachably mounted on the rear portion of the tractor (1). A work machine connection frame (26) is integrally provided on (10, 10), and a tractor (45) is attached to a joint cover (45) which is detachably attached to the work machine connection frame (26) and can be pivoted up and down. 1) A detachable transmission comprising a universal joint (22) removably connected to the rear PTO shaft (20) and an intermediate shaft portion (23) removably connected to the input shaft (21) on the work machine (2) side. A holding mechanism that supports the portion (24), and that the joint cover (45) can be turned up and down with respect to the hitch frame (10, 10) or the work machine connection frame (26) and is biased upward. (30) universal joint ( 2) of the tractor, characterized in that urges supported above the side working machine coupling device.   A holding ring (46) is provided on the intermediate shaft portion (23) via a bearing (44) fitted to the outer periphery, and locking bodies (47, 47) are provided on the outer left and right sides of the holding ring (46). Attach the ring (46) to the latch pin (48, 48) protruding toward the inside of the hitch frame (10, 10) or the work machine connection frame (26) so as to be detachable and swingable upward. The joint cover (45) is fixed to the holding ring (46) forward, and the joint cover (45) is held by the holding mechanism (30). The holding mechanism (30) is connected to the joint cover (45). The holding pins (51, 51) projecting in the horizontal direction from the side surface of the) and the hitch frame (10, 10) or work implement connection frame (26) are provided so as to be rotatable around a horizontal axis. Presents a side view of the pins (51, 51) A holding frame (53) that can be held by the intermediate portion (53a), and a tension engaged with the left and right connecting portions (53b) of the holding frame (53) to urge the holding frame (53) upward. The tractor work machine coupling device according to claim 1, wherein the tractor work machine coupling device comprises a spring (54).

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