JPH0673404B2 - Working machine coupling device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling device having a function of coupling a working machine to a tractor and automatically connecting a rotary drive shaft to which power is transmitted. It is useful for connecting a tractor and a rotary drive machine.

2. Description of the Related Art: A work machine for driving type work such as a rotary (hereinafter simply referred to as a work machine) is usually connected to a tractor, and the PTO shaft (output extraction shaft) of the tractor is connected to an input shaft of the work machine. Then, the power is transmitted to the working machine and desired work is performed. FIG. 5 shows a typical example thereof, which is a top link (4) pivotally attached to the top link mounting frame (2) protruding to the rear of the tractor (1) and a lower link pivotally attached to the lower rear part. A quick frame (6) having upper and lower ends pivotally connected to each other is attached to (5). The working machine (7) is connected to the quick frame (6), and the PTO shaft (3) provided at the tail of the tractor (1) and the input shaft (8) of the working machine (7).
Are connected by a universal joint (9) so that the work machine (7) can perform the required work.

The universal joint shaft (9) is composed of a universal joint arranged at both ends and a retractable spline shaft, and the PTO shaft (3) of the tractor (1) and the working machine (7) by raising and lowering the working machine with respect to the tractor. The driving force is transmitted regardless of the deviation of the shaft center of the input shaft (8) and the fluctuation of the length thereof.

For connecting the universal joint shaft (9) and the input shaft (8) of the working machine (7), a means such as pin-locking a sleeve or fixing a flange is usually used. On the other hand, the working machine (7) is suspended on the top of the quick frame (6), and both lower ends of the quick frame (6) are engaged with the working machine frame by the lifting operation of the lift arm (5) '. , Can be connected to the tractor (1) relatively easily.

As a result, even if the working machine (7) itself can be easily connected to the tractor (1), the transmission of the driving force to the working machine (7) requires many steps for the connection operation as described above, and The same result is obtained when the working machine (7) is released, and the universal joint shaft (9) for transmitting the driving force and the input shaft (8) can be connected or disconnected easily and surely like the connection of the working machine (7). Means have been sought.

One of the measures for facilitating the connection for transmitting the driving force is proposed by Japanese Patent Laid-Open No. 62-65602. In this technique, the universal joint shaft (9) that transmits power from the tractor (1) and the input shaft (8) of the working machine (7) are connected to each other by a quick frame that connects the tractor (1) and the working machine (7). (6)
The work of connecting the power transmission system again was eliminated as it was done through the connection.

Problems to be Solved by the Invention: In the above conventional technology, the universal joint shaft (9) and the input shaft (8) are used.
Since the connection with the clutch claws provided at the joint ends of both shafts is engaged, the clutch claws are often connected in a state in which they are inclined to each other due to manufacturing error. Since it is only done in part, the clutch claw is subjected to impact load and is damaged early. Also, the bearing that rotatably supports the clutch claw may be damaged early due to an eccentric load. In order to prevent this, a synchronization mechanism is required, and it is inevitable that the structure of the connecting portion of the working machine (7) becomes complicated. Further, the meshing connection of the clasp pawls is conditioned on that they are on a constant axis and at a constant position, so that the flexibility for other working machines is poor.

In order to solve such a problem, the present invention facilitates connection between the power transmission side of the universal joint on the input shaft side of the work machine and the tip side of the input shaft of the work machine for driving force transmission. In addition, even if there is a manufacturing error, it is possible to provide a working machine connecting device that surely fits on a coaxial core and enables various work machines to be easily connected with excellent compatibility. It is in.

Means for Solving the Problems: In order to achieve the above-mentioned object, the coupling device for a working machine according to the present invention is a quick frame pivotally connected to each end of a three-point link provided at the end of a tractor. In the coupling device that connects the working machine via the tractor and transmits power from the connected tractor to the working machine: a universal joint fixed to the PTO shaft of the tractor and a quick frame located on the input shaft side of the working machine. A spline shaft that connects with a universal joint that is supported so that it can move back and forth is provided so that it can expand and contract, and a thrust spring is fitted to this spline shaft.The power transmission side of the universal joint on the input shaft side of the work machine and the work machine A convex part having a tapered receiving hole having an elliptical cross section and a tapered front part having an elliptical cross section between the input shaft and the tip side. And the work machine is connected by a quick frame, and a convex part having a tapered front part with an elliptical cross section is inserted into the receiving hole of the tapered part with an elliptical cross section to form an elliptical surface. The outer peripheral surface of the convex portion having the tapered front part of the abutment is in contact with the inner peripheral surface of the tapered receiving hole having an elliptical cross section in the entire circumferential direction. To do.

Action: A convex portion having a tapered front portion having an elliptical cross-sectional shape is guided by the inclined surface of the receiving hole having a tapered elliptical sectional shape, and the convex portion fits into the receiving hole. Since the convex portion is guided and fitted into the inclined surface of the receiving hole, the shaft center is aligned with the power transmission side of the universal joint on the input shaft side of the working machine and the input shaft tip side of the working machine. Even if they are parallel without fitting, they are surely fitted on the coaxial core. Further, even if there is a certain angle between the power transmission side and the tip end side of the input shaft, in other words, even if there is a phase difference, the elliptical cross-sectional shape of the convex portion and the receiving hole corrects the phase difference and ensures the fitting. To do.

Further, by fitting on the coaxial core and in the same phase, an outer peripheral surface of a convex portion having a tapered front portion having an elliptical cross section and an inner peripheral surface of a receiving hole having a tapered elliptical cross section are formed. Abut on the entire circumference in the circumferential direction, and the rotational torque provided via the power joint shaft is transmitted as a whole to the input shaft through the abutment surface without loss.

Embodiment: An embodiment of the present invention will be described below with reference to the drawings. First
The figure shows the configuration of the device of the present invention, and (3) is the PTO of the tractor.
A shaft, (4) is a top link, (5) is a lower link ((5) 'is a lift arm attached to the machine body, and the lower link is moved up and down via a lift rod (5) "by hydraulic pressure generated by a tractor. (6) is a quick frame, and (8) is an input shaft of a working machine. In the conventional example, a mere universal joint shaft has been commonly used. In the present invention, a thrust joint shaft (10) is used for the rotational power transmission mechanism between the thrust joint shaft (10), which is connected to the PTO shaft (3), and the universal joint (11) 'and the input shaft (10). 8) Insert a spline shaft (12) between the universal joint (11) and the spline shaft (12), and insert a thrust spring (13) on the outer circumference of the spline shaft (12). Universal joint on the shaft (8) side The universal joint (11) has a large opening on the side facing the input shaft (8) of the work machine, and the power transmission clamp side of the universal joint (11) has a large opening. The female joint (20) is formed with a receiving hole (21) having a smaller cross-sectional area as it goes to the bottom.
The cross-sectional shape along the plane perpendicular to the axis of shall be elliptical. A flange (22) is formed on the periphery of the female joint (20), and a disk-shaped stopper (23) fixed to a quick frame (6) attached to the tractor via each link.
Also, a separation prevention plate (24) provided at a constant distance from the plate.
It is interposed between.

On the other hand, a flat gun-shaped male joint (30) having a parabolic cross section including the axis is fixed to the tip of the input shaft (8) of the work machine by a fixing pin (31). At the same time, as shown in FIG. 4, this male joint (30) also has an elliptical shape and corresponds to the sectional shape of the receiving hole (21) of the female joint (20).

The connecting device of the present invention comprising a thrust joint shaft (10), a female joint (20) formed at the tip thereof, and a male joint (30) which is coupled to the thrust joint shaft (10) has a male joint (30) as shown in FIG. The forehead of was formed on the insertion profile surface (32) to achieve smooth fitting. Further, a portion adjacent to the insertion profile surface (32) of the male joint (30) and an inner surface portion of the receiving hole (21) of the female joint (20) are a torque transmission surface (33) and a torque transmission surface (25), respectively. Rotational torque is reliably transmitted by the sectional shape of the male joint (30) illustrated in FIG. 4 and the inner shape of the receiving hole (21) of the female joint (20) corresponding thereto.

The connecting device of the working machine having such a structure uses the suspension portion (14) at the top of the quick frame (6) shown in FIG. 1 as a fulcrum, and connects the working frame of the quick frame (6) shown in FIG. By competing the weight component of the working machine (7) connected to the part (15) and the thrust of the thrust spring (13) mounted on the thrust joint shaft (10), the female joint (20) and the male joint (3)
Coupling with 0) is performed automatically.

Before the working machine is coupled, the flange (22) of the female joint (20) is pressed against the stopper (23) having the centripetal disc surface by the thrust spring (13) of the thrust joint shaft (10). When the working machine is connected, the flange (22) separates from the stopper (23) and achieves the coupling as described above. And the receiving hole (2) of the female joint (20)
The cross-sectional shape of 1) and the cross-sectional shape of the outer circumference of the male joint (30) are matched, and they rotate at the same speed while maintaining the slip.
Reliably transmit torque.

EFFECTS OF THE INVENTION As described above, according to the present invention, while facilitating the connection between the power transmission side of the universal joint on the input shaft side of the working machine and the tip side of the input shaft of the working machine for driving force transmission. , If there is a phase difference between the power transmission side of the universal joint on the input shaft side of the work machine and the tip side of the input shaft of the work machine due to manufacturing errors, etc. Even at this time, the guiding action between the outer peripheral surface of the convex portion having a tapered front portion having an elliptical cross-sectional shape and the inner peripheral surface of the receiving hole having a tapered elliptical cross-sectional shape ensures that it is on the same coaxial axis and is the same. Mating in phase allows various work machines to be connected easily with excellent compatibility. Also, by fitting on the coaxial core and in the same phase, the outer peripheral surface of the convex portion having the tapered front portion of the elliptical sectional shape and the inner peripheral surface of the receiving hole of the tapered elliptical sectional shape. Is abutted all over in the circumferential direction and the rotational torque provided via the power joint shaft is transmitted to the input shaft as a whole through the abutment surface without loss, resulting in a durable power transmission configuration. .

[Brief description of drawings]

FIG. 1 is an explanatory view of one embodiment of the present invention, and FIG. 2 is a view of FIG.
II-II view, FIG. 3 is a view showing the relation between the female joint and the male joint, FIG. 4 is a sectional view of the male joint in the IV-IV sectional view of FIG. 3, and FIG. 5 is a tractor and work It is a figure which shows the conventional example of the connection state with a machine, and a connection part. (1) …… Tractor, (2) …… Toplink mounting frame (3) …… PTO shaft, (4) …… Toplink (5) …… Lower link, (5) ′ …… Lift arm (5) ″ …… Lift rod, (6) …… Quick frame (7) …… Work machine, (8) …… Input shaft (9) …… Universal joint shaft, (10) …… Thrust joint shaft (11) (11) ) '…… Universal joint (12) …… Spline shaft, (13) …… Thrust spring (14) …… Suspension part, (15) …… Work implement coupling part (20) …… Female joint, (21) …… Receiving hole (22) …… Flange, (23) …… Stopper (24) …… Release prevention plate, (25) …… Torque transmitting surface (30) …… Male joint, (31) …… Fastening pin (32) …… Insertion copying surface, (33) …… Torque transmitting surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hiroji Okuda, 7-6, Seiwadai, Kawai-cho, Kitakatsuragi-gun, Nara Prefecture, 6-6, Okuda Engineering Co., Ltd. (56) Reference JP-A-62-118807 (JP, A) JP Sho 59-164227 (JP, A)

Claims (1)

[Claims] 1. A connecting device for connecting a working machine through a quick frame pivotally connected to each end of a three-point link provided at an end of a tractor, and for transmitting power from a connected tractor to the working machine. In: A spline shaft that connects the universal joint fixed to the PTO shaft of the tractor and the universal joint that is located on the input shaft side of the work machine and supported by the quick frame so as to be movable back and forth is expandable. A thrust spring is fitted to, and between the power transmission side of the universal joint on the input shaft side of the work machine and the tip side of the input shaft of the work machine, there is a tapered receiving hole with an elliptical cross section and an elliptical cross section. Each of them has a convex part with a tapered front part, and a constricted part with an elliptical cross-section along with the connection of the work machine with the quick frame. By inserting the convex part with the forehead into the receiving hole of the elliptical cross-section tapered tip, the outer peripheral surface of the convex part with the elliptical cross-section tapered front head has the elliptical cross-section tip. A connecting device for a working machine, which is configured to abut on an inner peripheral surface of a constricted receiving hole in a circumferential direction as a whole.