JPH0785684B2 - Working machine mounting device for tractor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device that allows one-touch mounting of a working machine on the rear part of a tractor. 2. Description of the Related Art As a conventional technique for mounting a working machine of a tractor, Japanese Patent Application No. 60-262913 filed by the same applicant is used.
A technique such as Japanese Patent Publication has been filed as a prior application. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is configured to solve the problems of the technique of the prior application. That is, the power transmission joint between the PTO shaft of the tractor and the input shaft of the work implement is also connected at the same time when the work implement is mounted. At the joint portion of the joint, the joint on the work implement side and the joint on the tractor side are connected. There were cases where they did not mesh well.
In the present invention, it is possible to absorb the inclination of the joint portion and the deviation between the left and right sides, and at the time of rotation, the cores of the front and rear shafts are aligned by self-alignment, which causes noise from the joint portion and uneven wear of the bearing portion. This is to prevent the joint part from slipping out. The object of the present invention is as described above. Next, the structure for achieving the object will be described.
That is, in a configuration in which the work machine is connected and the work machine drive shaft is connected by raising and lowering the hitch-side frame, the hitch-side drive shaft and the drive shaft bearing that supports the hitch-side drive shaft on the hitch-side frame by bearings. And are rotatable with respect to the hitch-side frame. Further, the bearing case of the drive shaft bearing that supports the hitch side drive shaft can be vertically adjusted with respect to the hitch plate through the elongated hole. Further, in a moving bearing that supports the rear portion of the hitch-side drive shaft that can be adjusted up and down, an elastic holding member is brought into contact with the outer periphery of the moving bearing to hold the moving bearing at a fixed position. Next, the operation will be described. That is, when the hitch-side drive shaft 17 attached to the hitch-side frame 1 and the input shaft on the working machine side do not coincide in the axes of the PTO shaft connecting operation that is performed at the same time as mounting the working machine, for example, one of them tilts. In the case where the drive shaft bearing 10 is in the vertical direction or when it is displaced in the vertical direction, the bearing case 10a of the drive shaft bearing 10 can be vertically moved and adjusted, and the movable bearing 20 can be adjusted in the left and right directions and the inclination. , Joint 9 and joint 21
Connection was smooth, and generation of abnormal noise from the joint portion during rotation and disconnection between the joints 9 and 21 could be eliminated. Also, the bearing case 2 of the moving bearing 20
Since the portion 0a is held from the outer periphery by the elastic holding member 25 formed of a leaf spring or the like, the hitch side drive shaft 17
Since a biasing force that always tries to return to the center position is exerted on the hitch-side drive shaft 17, the hitch-side drive shaft 17 automatically returns to the normal position after the joint 21 is disengaged. As a result, even when the joint 9 and the joint 21 are connected next, the connection can be smoothly performed. The object and structure of the present invention are as described above, and the structure and operation of the embodiment shown in the accompanying drawings will be described below.
FIG. 1 is a side view of the working machine mounting apparatus of the present invention in a mounted state. In the three-point link type working machine mounting device at the rear of the tractor, the rear end of the top link 18 is pivotally attached to the upper end of the hitch-side frame 1 via a pivot pin. The rear end of the lower link (not shown) is fitted to the hitch lower link pin 6. The hitch-side frame 1 is vertically moved by the hydraulic device of the tractor while being supported at three points by the one top link 18 and the two lower links. When the hitch-side frame 1 moves up and down, the work-machine-side top link pin 39 arranged at the tip of the work-machine-side top link masts 12, 13 is moved to the top locking hook 3 at the upper end of the hitch-side frame 1. And the working machine side lower link pin 7 provided on the lower link hinge 15 is engaged with the hook 5 of the lower locking hook 2 so that the lower link hinge 15 can be mounted with one touch. Reference numeral 11 is a rotary gear box of the rotary tiller, 16 is a tiller cover, and 24 is a main beam. Since it is necessary to mount the working machine and connect the input shaft of the rotary gear box 11 and the PTO shaft of the tractor with the top locking hook 3 and the lower locking hook 2 provided on the hitch side frame 1. is there. Power is transmitted from the PTO shaft of the tractor to the hitch-side drive shaft 17 supported by the hitch-side frame 1 by the universal joint 26 covered by the universal joint cover 32. The hitch-side drive shaft 17 is arranged in the central portion of the hitch-side frame 1, and is configured to be automatically connected to the joint portion of the input shaft on the working machine side when the working machine is mounted. -ing Reference numeral 4 is a hook release handle for releasing the hook 5, 2a is a locking recess of the working machine side lower link pin 7 of the lower locking hook 2, and 5a is a locking recess of the working machine side lower link pin 7 in the hook 5. Is. A hitch plate 8 is fixed between the left and right lower hooks 2, 2 by bolts 40, 40. The hitch side drive shaft 17 is bearing-supported by the hitch plate 8. 2 is a side view of the hitch-side frame 1 and the lower locking hook 2, and FIG. 3 is a rear view of the same.
4 is a partial plan cross-sectional view of the rotary and lower locking hooks 2, FIG. 5 is a plan view of a hitch plate 8 fitted between the left and right lower locking hooks 2, and FIG. 6 is a hitch side of the hitch plate 8. FIG. 3 is a side sectional view of a portion supporting a drive shaft 17. First, the structure of the lower locking hook 2 will be described with reference to FIGS. 2, 3 and 4. The hitch-side frame 1 has an inverted U-shape in front and rear view.
It is configured as a V-shaped frame, and the top locking hook 3 is fixedly provided at the center of the upper end. Hitch lower link pins 6 are fixed to the left and right lower ends, and the hooks 5 are pivotally supported. The hitch lower link pin 6 is fixed between the lower locking hook 2 and the U-shaped reinforcing plate 14. The hook 5 is formed integrally with the hook release handle 4, and the midway portion of the integrated state is pivotally supported on the outer periphery of the pivot shaft also used by the hitch lower link pin 6. A fulcrum crossing spring is interposed in the hook release handle 4 and is urged to either the released state or the state in which the working machine side lower link pin 7 is locked. A bolt 40 for fixing the hitch plate 8 is fitted in a bolt hole 2c provided in the lower locking hook 2. The hitch plate 8 shown in FIGS. 8 and 9 is fixed between the left and right lower hooks 2 by bolts 40. A passage hole 8d for the hitch-side drive shaft 17 is formed in the center of the hitch plate 8, and elongated holes 8a for allowing the drive shaft bearing 10 to be vertically movable are formed on both sides of the passage hole 8d. Further, both end plates 8b of the hitch plate 8 are provided with screw holes 8c of bolts 40. In FIGS. 6 and 7, the hitch side drive shaft 17 is shown.
The bearing support structure will be described. Hitch side drive shaft 17
A universal joint 26 is spline-fitted to the front end of the. And at the rear end of the hitch side drive shaft 17,
The joint 21 at the front end of the input shaft of the work machine is the hitch side drive shaft 1
It is configured to mesh with the joint 9 on the 7 side to transmit power. However, both the universal joint 26 side and the input shaft side of the work machine have vertical shaft positions, and in order to clearly indicate the shaft center position when connecting the two and rotating after connecting. Also, drive shaft 1 on the hitch side
It is impossible to completely fix the bearing 7 and support it. For this purpose, the present invention is provided with a drive shaft bearing 10 for supporting the hitch side drive shaft 17 and a movable bearing 20 so that the bearing can move to some extent. That is, drive shaft bearing 1
0 supports the bearing case 10a part in the long hole 8a of the hitch plate 8 with the bolt 23, and with the bolt 23,
As shown in FIG. 5, the wave washer 22 is fitted to the portion where the bearing case 10a is fastened. By inserting the wave washer 22 between the bearing case 10a and the bolt 23, the bearing case 10a is vertically moved to the long hole 8a.
You can move inside. Further, another moving bearing 20 is provided in the rear portion of the hitch-side drive shaft 17, and the movable bearing 20 always arranges the rear end of the hitch-side drive shaft 17 at the center regular position. For this purpose, the elastic holding members 25 are arranged on the left and right. The elastic holding member 25 is constituted by a leaf spring, and the upper and lower elastic holding member fixing fittings 1
It is fixed to 9 and 19 with bolts. Therefore, by being supported by the elastic holding member 25, the moving bearing 20 itself can move to the left and right to some extent. Therefore, even if the positional relationship between the joints 9 and 21 is deviated when the joints 9 and 21 are connected, the displacement of the position can be absorbed by the movement of the movable bearing 20 by the elastic holding member 25. . Further, when the protrusions come into contact with each other due to the positions of the recesses and protrusions of the joint 9 and the joint 21 at the time of mounting, either one needs to be retracted, so that the joint 9 is driven on the hitch side. Sliding is possible on the shaft 17, and after sliding once, the disc spring 7
However, it is interposed between the joint 9 and the drive-side bearing 10 on the outer circumference of the hitch-side drive shaft 17. 8 is a rear view of the hitch plate 8, FIG. 9 is a side view thereof, FIG. 10 is a side view of the elastic holding member 25, FIG. 11 is a rear view thereof, and FIG.
1 is a drawing showing a portion of a bolt hole of the elastic holding member 25, FIG.
3 is a rear view of the drive shaft bearing 10 and the bearing case 10a, FIG. 14 is a side sectional view of the same, FIG. 15 is a side view of the hitch side drive shaft 17, and FIG. 16 is a sectional view of the same. As shown in FIGS. 15 and 16, the end of the hitch-side drive shaft 17 is formed into a hexagonal spline shape, has the same shape as the input shaft of a normal working machine, and the mounting device has three points of a conventional tractor. It can be mounted on any link type work machine mounting device. Since the present invention is configured as described above, it has the following effects. First, in the connecting operation of the PTO shafts performed at the same time as the mounting of the working machine, when the hitch side drive shaft 17 attached to the hitch side frame 1 and the working machine side input shaft do not coincide with each other, for example, either Even when the shaft is tilted or vertically displaced, the bearing case 10a of the drive shaft bearing 10 can be moved up and down to be adjusted, and the moving bearing 2
It is possible to adjust the left and right and the tilt at the 0 part, the connection between the joint 9 and the joint 21 becomes smooth, and abnormal noise is not generated from the joint portion at the time of rotation, and the joint 9 and 21 are not separated. Was made. Second, the moving bearing 20
Since the portion of the bearing case 20a is held from the outer periphery by the elastic holding member 25 formed of a leaf spring or the like, the hitch-side drive shaft 17 is always biased to return to the center position, and the joint 21 After being disengaged, the hitch-side drive shaft 17 automatically returns to the normal position. As a result, even when the joint 9 and the joint 21 are connected next time, the connection can be smoothly performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a working machine mounting apparatus of the present invention in a mounted state. FIG. 2 is a side view of a portion of a hitch side frame 1 and a lower engaging hook 2. FIG. 3 is a rear view of the same. FIG. 4 is a partial plan cross-sectional view of a rotary and lower locking hook 2. FIG. 5 is a plan view of a hitch plate 8 fitted between the left and right lower locking hooks 2. 6 is a side sectional view of a portion where a hitch side drive shaft 17 is supported by a hitch plate 8. FIG. FIG. 7 is a rear view of the same. FIG. 8 is a rear view of the hitch plate 8. FIG. 9 is a side view of the same. FIG. 10 is a side view of the elastic holding member 25. FIG. 11 is a rear view of the same. FIG. 12 is a view showing a portion of a bolt hole of an elastic holding member 25. FIG. 13: Drive shaft bearing 10 and bearing case 1
The rear view of the part of 0a. FIG. 14 is a side sectional view of the same. FIG. 15 is a side view of the hitch-side drive shaft 17. FIG. 16 is a sectional view of the same. [Explanation of reference signs] 1 Hitch side frame 2 Lower locking hook 8 Hitch plates 9, 21 Joint 10 Drive shaft bearing 17 Hitch side drive shaft 20 Moving bearing 25 Elastic holding member

Claims (1)

[Claims]. In a configuration in which the work machine is connected and the work machine drive shaft is connected by lifting and lowering the hitch-side frame, a hitch-side drive shaft and a drive shaft bearing for bearing-supporting the hitch-side drive shaft on the hitch-side frame are provided. A work implement mounting device for a tractor, which is rotatable with respect to the hitch-side frame. ． A work machine mounting device for a tractor, wherein a bearing case of a drive shaft bearing for supporting a hitch side drive shaft according to claim 1 is vertically adjustable with respect to a hitch plate through an elongated hole. ． A movable bearing for supporting a rear portion of a hitch-side drive shaft capable of being adjusted up and down according to claim 2, wherein an elastic holding member is brought into contact with an outer periphery of the movable bearing to keep the movable bearing at a fixed position. A work machine mounting device for a tractor characterized by being held.