JPS63216402A - Unit hitch for drawing working machine of tractor - 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 <Field of Industrial Application> The present invention relates to a unit hitch for towing a working machine of a tractor.

<Conventional technology and its problems> In general, tractors use a three-point linkage mechanism consisting of one top link and a pair of left and right lower links to suspend rotary tillers and other various types of work equipment so that they can be raised and lowered. At the same time, in order to transmit rotational power to the work equipment, a power take-off shaft (
Hereinafter, it will be abbreviated as the PTO axis. ) and an input shaft that corresponds to the front from the work equipment are pivotally connected by a universal joint shaft, but when the work equipment is removed, it is necessary to hold the universal joint shaft stably. Since there is a risk of accidental rotation due to erroneous operation from the driver's seat, it is customary to completely remove the universal joint shaft from the PTO shaft.

However, at the rear of the tractor, where the PTO shaft extends, there is only a narrow space surrounded by a pair of left and right rear wheels, and a safety cover fixed to the rear of the tractor prevents the PTO shaft from moving. Since the universal joint shaft is encapsulated, it is difficult to easily and correctly attach and detach the front end portion of the universal joint shaft to and from the PTO shaft.

In particular, for models that are equipped with a hitch frame in advance at the rear end of the three-point link mechanism, it is easy to attach and detach various work equipment to and from the hitch frame. Since the narrow space described above is surrounded by the link and the lower link, it becomes even more difficult to attach and detach the universal joint shaft to the PTO shaft.

In this regard, according to JP-A No. 59-140804, it is possible to connect the front end of the universal joint shaft and the PTO shaft correctly, and it can be said that the workability is considerably improved. , universal joint shaft support frames, spring materials, coupling sleeves, etc.
It is necessary to equip various work machines in advance.
Since this method cannot be applied to work machines that are not equipped with these, there is a problem of poor versatility or compatibility.

On the other hand, although the beam of Utility Model Application Publication No. 61-118204 solves the problem of its versatility for various types of work equipment, it only suspends the universal joint shaft midway through the beam, and its Since the shaft end is left exposed, it is still not possible to protect it from the risk of accidental rotation.

Means for Solving the Problems The main purpose of the present invention is to solve the problems mentioned above.
For this purpose, in a tractor, the pitch frame for attaching and detaching the work equipment is pivotally connected to the rear end of a three-point link mechanism that is raised and lowered by the hydraulic cylinder device of the tractor body. The frame is integrated into an overall almost A-shape when viewed from the front and rear directions, surrounding the connection allowable space between the universal joint shaft that projects rearward from the PTO shaft and the input shaft that corresponds to the front from the work machine. At the same time, install a holder to freely rotate the rear end of the universal joint shaft that was removed from the input shaft of the work equipment at a mid-height position on either the left or right side of both skirt arms on the lower floor. The first feature of the tractor is that the hitch frame for attaching and detaching the work implement is pivotally connected to the rear end of a three-point link mechanism which is also raised and lowered by a hydraulic cylinder device of the tractor body, When viewed from the front and back direction, the hitch frame is designed to surround the space that allows the connection between the universal joint shaft that extends rearward from the PTO shaft of the tractor body and the input shaft that corresponds to the front from the work machine. The frame is integrated in an almost A-shape, and the rear end of the universal joint shaft removed from the input shaft of the work equipment can be freely rotated to a mid-height position on either the left or right side of both skirt arms on the underfloor. Attach a holder that should not receive a bearing, and install a relay holder for a sensor wire that detects the ground work level of the work equipment and feeds it back to automatically control the control pulp of the hydraulic cylinder device at the remaining mid-height position. This is the second characteristic.

<Example> Hereinafter, the specific configuration of the present invention will be described in detail based on the illustrated example.
In Figures 1 to 6, which show the unused state of sushi, (T) is the tractor body, and 口→ is the general term for the working equipment towed by it. The figure shows a rotary tiller as an example. It shows. (10) is a top link mounting base that is fixedly installed at the rear of the tractor body (T), and one top link (11) that will be sent rearward from now on, and a top link that will also be sent rearward from the tractor body (T) itself. A pair of left and right lower links (12) form a three-point link mechanism (L) for towing the work equipment, and the three-point link mechanism (L) connects to a hydraulic cylinder mounted on the tractor body (T). By the device (13),
A pair of left and right lift arms (14) and a lift rod (
15), it goes without saying that it can be moved up and down.

(16) is a PTO shaft extending from the rear of the tractor body (T), and (17) is its safety cover, which is fixed to the rear of the tractor body (T). (18) is P
It is a universal joint shaft (suggested by its cover boot in the figure) that transmits the rotational power from the TO shaft (16) to the work equipment (1) side, and it is widened by its double cross joint (19). It is designed to be able to bend at an angle, as well as expand and contract in the front-rear direction.

The front end sleeve (20) of the universal joint shaft (18) is spline-fitted to the PTO shaft (16), and the lock pin (21) penetrated from the radial direction so that it can be freely inserted and raised, prevents removal. is maintained. On the other hand, the rear end sleeve (
22) In the same way, the lock pin (24) is fitted with a spline to the input shaft (23) of work wA (1).
The extraction is stopped by .

(H) is a general term for the pitch frame that allows the work equipment (1) to be quickly attached to the rear end of the three-point linkage mechanism (L), and when viewed from the front and rear directions, as shown in Figure 7. , the universal joint shaft (1B) and the input shaft of the work machine (1) (
The frame is integrated into a generally A-shaped overall shape that surrounds the space (S) allowing connection with 23). (25) has a pair of left and right lower floors that frame the hitch frame (H), which are made of hollow square steel.
A bifurcated holding plate (26) is fixedly integrated with the central upper end portion thereof. Then, the holding plate (z6
) is pivotally connected to the rear end of the top link (11) by a horizontal connecting pin (27).

(2nd) is the same (the pin receiver cut out in the upward opening form at the protruding rear end of the clamping plate (26) is inserted into a recessed groove, and (29) is used in combination with the recessed groove (28), Machine (
1) It is a locking hook that removably locks and fixes the top link holder (3o) of ill.
6) The mounting is held by a horizontal pivot pin (31) in the middle part of itself so that it can freely rotate in an undulating manner. (32) shows a reinforcing beam that is fixed and suspended horizontally between the left and right sides of both skirt arms (25).

Further, (33) is a two-pronged clamping plate fixed to the lower end of both skirt arms (25), and the protruding rear end of the plate also has a concave groove (34) into which a pin receiver opens upward.
is provided. And both skirt arms (2
5) The lower end is pivotally connected to the rear end of the lower link (12) via a horizontal connecting pin (35). In other words, the hitch frame (H) has versatility or compatibility with various work machines (I), and is pre-assembled into a unit at the rear end of the three-point link mechanism (L). That's why.

On the other hand, regarding work 1M (1), (36) is the main frame of the rotary tilling device, and a rotary gear case (37) is provided at an intermediate position in the longitudinal direction (left and right direction). The input shaft (23) mentioned above is projected forward. Its input shaft (
Needless to say, the shaft 23) has a spline shaft shape that can be properly fitted with the rear end sleeve (22) of the universal joint shaft (18).

(38) is a rotary chain case, and (39) is a rotary claw shaft, which is rotatably driven by power from an input shaft (23) via a transmission chain 7 (not shown). (40) are a pair of left and right support arms that integrally extend forward from the rotary main frame (36), facing each other with the gear case (37) in between, and each of the support arms protrudes laterally outward from each support arm. Horizontal connecting bins (4
1) The above pitch frame (old lower clamping plate (
Insert the pin receiver notched in 33) into the groove (34),
It is inserted and locked in a detachable manner.

Also, the top link holder (30) is attached to the gear case (
A horizontal connecting pin (42) that integrally projects forward and upward from 37) and extends horizontally through this connects to a pin receiver cut out in the upper clamping plate (26) of the hitch frame (H). It is inserted into the recessed groove (28) and fixedly locked by the locking hook (29).

(43) is a rotary front cover, to the rear end of which a plurality of bridge arms (45) are pivotally connected via horizontal connecting pins (44), and at the rear of the bridge arms (45). A rotary rear cover (46) is fixedly integrated with the end portion in a suspended state.
(47) is an elastic membrane connected and interposed between the front and rear of both force bars (43) and (46) so as to cover the lower surface of the bridge arm (45); (48) attached to the rear lower end of the bridge arm (46); The leveling plate (49) is a support rod that stands up from the rear cover (46), and the coil spring (50) attached to this supports the leveling plate (49).
A grounding bullet force is applied to the adhesive cover (46). Furthermore, (51) is an operating screw handle for adjusting the elevation of the beamer cover (46).

Both skirt arms (2) of the above hitch frame (H)
5) is in a positional relationship facing the rear end of the universal joint shaft (18), as is clear from the figure. A holder (52) for freely rotating the t&end of the universal joint shaft (18).
) is installed as an accessory.

That is, the bearing holder (52) has a ball bearing (54) sealed inside the annular box (53) and the bearing (54), as shown in Fig. 7.8 and enlarged. An assembly consisting of a rotatably supported short spline shaft (55), the spline shaft (55) being compatible with the input shaft (23) at 1 & 2 of the universal joint shaft (18). End sleeve (22)
In addition, a four-perimeter m (56) is formed on its surface to receive the lock pin (24) of the rear end sleeve (22).

A hanger stay (57) integrally extended from the box (53) is attached to the skirt arm (25).
The installation is fixed by the reinforcing piece (58) to ) and the pole (59). When installing the holder (52), the rear end sleeve (22) of the universal joint shaft (18) is used in conjunction with the input shaft (23) of the working machine (1) as shown in Figures 1 to 3. In order to prevent this from becoming a hindrance to the movement of the vehicle, it should be deviated to either the left or right side and evacuated so as to leave a certain connection permissible space (S) as shown by the imaginary division line in Figure 7. Of course, it is positioned so that Furthermore, (60) (61
) indicates a shaft retaining ring and a hole retaining ring fitted to the spline shaft (55) and box (53), respectively, to prevent the bearing (54) from being removed, and (62) indicates a dust cover.

Furthermore, both skirt arms (
25), a relay holder (64) for the sensor wire (63) is also attached and installed at the other mid-height position. As is clear from FIG. 7, the relay holder (64) consists of a play (65) for connecting the sensor wire (63) and a support shaft (66) for swinging the plate (65). The support shaft (66) is fixedly integrated with the skirt arm (25).
7) It is inserted and set so that it can be tilted and swung back and forth along its horizontal axis.

The above-mentioned sensor wire (63) is used for swinging motion of the rotary rear cover (46) in the vertical direction.
The ground work level of the work equipment (I) is detected, and the action signal is fed back to the hydraulic control pulp (not shown) attached to the hydraulic cylinder device (13) to maintain the pulp at a constant ground work level. In this sense, the active lever (68) projected from the hydraulic control pulp to the outside and the bridge arm (45) of the rotary rear cover (46) are connected to each other between the front and rear. has been done.

In that case, in the figure, the sensor wire (63) is divided into two parts, one on the tractor body (T) side and the other on the work machine (1) side, so to speak, and the front sensor wire (63a)
Place the rear end of the relay holder (64) on the
65) and connect and hold the remaining front end with the rotating piece (
69) and a reciprocating rod (70), it is connected to the active lever (68).

On the other hand, the rear sensor wire (63b) uses this as a rigid advance/retreat rod, with its rear end pivotally connected to the bridge arm (45) of the rotary rear cover (46), and its remaining front end connected to the support arm (45). 40), it is connected and held by a horizontal support shaft (71) to a plate (72) which is also attached so as to be tiltable and swingable in the front-rear direction.

Then, the work machine (N side play) (72) and the relay holder (64) play) (65),
When the work equipment (1) is connected to the tractor body (T), the sensor wires (63a') (63
b) is set to move forward and backward in an integrated manner as a whole.

In other words, when the work machine (1) is connected to the tractor body (T), the relay holder (64) stably holds the middle part of the sensor wire (63), and the work machine (1) When not in use with the holder (64) removed, the holder (64) is also connected to the front sensor wire (C3a).
It is designed to hold the rear end of the device in such a way that it hangs down as it is.

According to the above configuration, as is clear from Fig. 1.3, the work machine (
1), and also connect the universal joint shaft (1).
By spline-fitting the T&end sleeve 22) of 8) and the input shaft (23) on the working machine port side, and fixing the fitted state with a lock pin (24) to prevent removal,
The rotational power taken out from the PTO shaft (16) is transferred to the work machine (
1), and the lifting and lowering action of the working machine (1) can be smoothly achieved.

At this time, the bearing holder (52), which is scheduled to support the rear end of the universal joint shaft (18), is in a position evacuated from the working area of the universal joint shaft (18), so that There is no hindrance to transmission or refraction movements, and the same is true for the relay holder (64) of the sensor wire (63).

By removing the work machine (1) from the hitch frame () () and separating the input shaft (23) of the work machine (1) and the rear end sleeve (22) of the universal joint shaft (18), As shown in Figure 4.6, the work implement (1) can be disassembled from the tractor body (T) side.
At that time, fit the rear end sleeve (22) of the universal joint shaft (18) to the spline shaft (55) of the holder (52) for the bearing attached to the pitch frame (H), and The lock pin (24) of the sleeve (22) stably holds the sleeve (22) in a state where it cannot be removed.

This will prevent the PTo axis (
Even if the universal joint shaft (16) and the universal joint shaft (1B) are accidentally rotated, the rear end of the universal joint shaft (18) is held in the holder (52), so to speak. - There is no risk of cutting the input shaft, there is no damage to the shaft system, and the input shaft is held at a constant height from the ground.
23) can be efficiently connected in a so-called one-touch manner.
Moreover, it can be performed accurately and smoothly.

<Effects of the Invention> As described above, in the present invention, the working machine (1) is connected to the rear end of the three-point link mechanism (L) that is lifted and lowered by the hydraulic cylinder device (13) of the tractor body (T). In a tractor comprising a hitch frame (H) for attaching and detaching, the hitch frame (H) is connected to a universal joint shaft (18) extending rearward from a PTO shaft (16) of the tractor body (T). , the frame is integrated into a generally A-shaped overall shape when viewed from the front and rear directions, surrounding the connection allowable space (S) with the input shaft (23) correspondingly projected forward from the working machine (I), Move the rear end of the universal joint shaft (18) removed from the input shaft (23) of the working machine (1) to a mid-height position on either the left or right side of both skirt arms (25) on the lower floor. Since the holder (52) to be rotatably supported is mounted, all the problems of the prior art described at the beginning can be solved, and the work implement (I) can be removed from the tractor body (T). Safety when not in use and the tractor body (
This has the effect of significantly improving the workability of attaching and detaching T).

In addition to the holder (52), the above-mentioned bearing is also used for work l
The relay holder (64) for the sensor wire (63) that detects the ground work level of (1) and provides feedback to automatically control the control valve of the hydraulic cylinder device (13) is also located on the skirt of the hitch frame (H). If installed as an accessory to the arm (25), in addition to achieving the above effects, the sensor wire (63)
) between the hydraulic control valve of the tractor body (T) and the work implement (1), the sensor wire (63) can be held stably at all times, and the Work equipment ([
) can be done with high efficiency, and from that point of view it can be said to be even more profitable.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway right side view showing how the working machine is connected to the tractor body, Figures 2 and 3 are a left side view and a partially cutaway plan view, and Figure 4 is a partially cutaway right side view showing how the working machine is connected to the tractor body. Partially broken right side view showing the removed state, No. 5
．． Figure 6 is a left side view and a partially cutaway plan view of only the tractor body side, Figure 7 is a rear view showing the extracted pitch frame, and Figure 8 is an enlarged sectional view taken along the line ■-■ in Figure 7. It is. (T) ...Tractor body (1) ...Work machine (L) ...Three-point linkage mechanism (H) ...Hitchi frame (S) ... Connection allowable space (13)...
...Hydraulic cylinder device (16) ...PTO shaft (18) ...Universal joint shaft (23)
...Input shaft (25) ...Skirt arm (52) ...Bearing holder (53) ...Box (54) ...Ball bearing (55 )...Spline shaft (56)...Concave circumferential groove (57)...Hanger stay (63)...Sensor wire (64)...Relay holder (65)...Plate (66)...Spindle (78)...Bearing tube Figure 3 Figure 6

Claims (1)

[Claims] 1. Hydraulic cylinder device (13) of tractor body (T)
), in which a hitch frame (H) for attaching and detaching a work implement (I) is pivotally connected to the rear end of a three-point linkage mechanism (L) that is raised and lowered by Allowable connection space (S) between the universal joint shaft (18) extending rearward from the PTO shaft (16) of the tractor body (T) and the input shaft (23) correspondingly extending forward from the work implement (I). The work equipment (I) is integrated into the frame into an almost A-shaped overall shape when viewed from the front and rear directions, and the working machine (I) input shaft (
23) removed from the universal joint shaft (1).
8) A holder (52
) A unit hitch for towing tractor work equipment. 2. Place the bearing holder (52) into the annular box (53).
) and a short spline shaft (55) rotatably supported by the bearing (54), and the spline shaft (55) is a universal joint. Axis (18)
A hanger stay (57) integrally projected from the box (53) is fixed to the skirt arm (25) of the hitch frame (H). A unit hitch for towing a tractor working machine according to claim 1. 3. Hydraulic cylinder device (13) of tractor body (T)
), in which a hitch frame (H) for attaching and detaching a work implement (I) is pivotally connected to the rear end of a three-point linkage mechanism (L) that is raised and lowered by Allowable connection space (S) between the universal joint shaft (18) extending rearward from the PTO shaft (16) of the tractor body (T) and the input shaft (23) correspondingly extending forward from the work implement (I). The frame is integrated into an almost A-shaped overall frame when viewed from the front and rear directions, and both skirt arms (25
) to the mid-height position on either the left or right side of the work machine (
At the same time, attach the holder (52) that should freely rotatably support the rear end of the universal joint shaft (18) that was removed from the input shaft (23) of the work implement (I) to the remaining half-way height position. ) to detect the ground work level of
A unit hitch for towing a tractor working machine, characterized in that a holder (64) for relaying a sensor wire (63) that provides feedback to automatically control a control valve of a hydraulic cylinder device (13) is attached. 4. Connect the relay holder (64) to the sensor wire (6
3) and a plate (65) that connects the plate (65).
5) is formed from a supporting shaft (66) for swinging, and the supporting shaft (66) is attached to the skirt arm (25) of the hitch frame (H) so that it can tilt and swing in the front and rear direction around the horizontal axis. A unit hitch for towing a tractor working machine according to claim 3, characterized in that the hitch is mounted on a bearing.