JPS5849129B2 - Tail wheel floating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating device for a tail wheel, which ensures reliable switching between a floating attitude and a fixed attitude, greatly raises the tail wheel support in the height direction, and The purpose of this invention is to maintain a fixed posture at this position, to balance the front and rear weight balance, and to facilitate maintenance and management of the working part.

In order to achieve such an object, the present inventor has conducted extensive research and has developed a structure in which a tail wheel support including a tail wheel is connected to the body of the working machine so as to be able to rise and fall freely, and the tail wheel support and the working machine In the machine frame connected to the machine frame by a working depth adjusting body, a floating member is rotatably provided on the tail wheel m body, the adjusting body is pivotally attached to the floating member, and a plate is attached to the floating member. A retaining portion is provided at a position corresponding to the grounding position of the lowering tail wheel and an upward retreat position of the tail wheel, and a floating action allowing portion is provided between the engaging portions, and a floating action allowing portion is provided between the engaging portions, and On the other hand, they succeeded in developing a tail wheel floating device characterized by having a detachable engagement body provided on the tail wheel support.

Hereinafter, preferred specific examples of the present invention will be described in detail.

In FIG. 1, which shows a normal working position, 1 is a tractor body with a transmission case as a structural body, 2 is a pair of left and right rear wheels, and 3 is a wheel fender.

Reference numeral 4 denotes a work equipment lifting device, which is normally comprised of a hydraulic piston and cylinder operated by controlling a valve with a control lever, and is provided in a housing 5.

The lifting device 4 is mounted on the rear upper surface of the vehicle body 1, and has a pair of left and right linoto arms 6 that rotate in the lifting direction around a horizontal axis when liquid is delivered to the piston.

Reference numeral 7 denotes a fixed base, which is fixed to the upper rear surface of the vehicle body 1 and at the center in the width direction of the vehicle body.A topplink mounting base 8 is provided to be detachably attached to the fixed base 7, and the mounting base 8 is mounted rearward. It is greatly prominent.

9 is a ground work machine, and the figure illustrates a rotary tillage machine, with a top mast 10, and a pair of left and right supports.
The machine frame consists of a machine frame including rings 11, etc., a transmission case 12, a working part 13 driven by a horizontal axis, a cover 1 material 14 of this working part, etc.

15 is a working machine connection device, and the figure shows a three-point link system consisting of a pair of left and right lower links 16 and a top printer 17 in the center, and both ends of each low link 16 are connected to the tractor body 1 for work. Both ends of the top link 17, which is pivotably attached to the machine 9 and is extendable in the axial direction, are pivoted between the top link mounting base 8 and the top mast 10, and each lift arm 6 and each lower link are attached to each other. 16 are connected to each other by a lift rond 18, the entire working machine is lifted, cased, and lowered relative to the tractor body by the lifting operation of the lifting device 4.

During this elevation, the top link 17 may be pivoted to the fixed base 7, but if it is pivoted to the mounting base 8 as shown, the link 1
The link length of No. 7 is shortened, which is advantageous because the working machine can be lifted up in an upward direction.

Reference numeral 19 denotes a power transmission body, which is a joint shaft detachably connected between the PTO shaft of the tractor body 1 and the input shaft of the transmission case 12. There is.

Reference numeral 21 denotes a tail wheel device, which is mainly composed of a tail wheel support 22 having a pair of left and right tail wheels 23, and the front ends of the pair of supports 22 are rotatably connected to the working machine frame through a horizontal shaft 241/l. A pair of left and right tail wheels 23 are provided on both sides of the rear of this support body 22 via tail wheel struts 25, etc., and are adjustable in the height direction and detachable. Located quite far away.

Reference numeral 26 denotes a working depth adjusting body, which is connected between the top mast 10 and the tail wheel support 22. As the adjusting body 26 expands and contracts, the tail wheel device 21 moves up and down using the horizontal shaft 24 as a fulcrum, and the working depth is adjusted here. Constructed so that the depth can be adjusted.

In the figure, a screw shaft 29 having a screw 27 and a thread 28 is threaded as an example of the adjusting body 26, but the adjusting body 26 may be of a cylinder type.

Reference numeral 30 denotes a floating member, which is pivoted about a horizontal shaft 31 midway in the longitudinal direction of the tail wheel support 22 and at the center of the working width.

The floating member 30 is integrally provided with an arm 32, and on the opposite side of the arm 32 is formed an arcuate cam surface 33 whose center locus is the horizontal axis 31, and at both longitudinal ends of this cam surface 33 are engaged The portion 34 and the second retaining portion 35 are each formed with a concave notch in the figure.

That is, the floating member 30 engages the engaging portion 3 in correspondence with the grounding position of the tail wheel when it is lowered and the upward retreat position of the tail wheel.
4.35, and the cam portion 33 between the engaging portions 34 and 35
is considered to be the floating action allowable part.

Reference numeral 36 denotes a detachable body, which is attached to the tail wheel support 2 as shown in FIG.
2K fixed holder 37V? : When the tail wheel 23 shown in FIG. 1 is in contact with the ground, the engaging and disengaging body 36 is inserted into the first engaging part 34 and can freely advance and retreat with respect to each engaging part 34, 35K of the floating member 30. When the tail wheel 23 is engaged and the tail wheel 23 is placed in the upwardly retracted position as shown in FIG.

Reference numeral 38 denotes an engaging/disengaging body operating lever, which is pivotally connected to a lever guide plate 39i/i1m for the lifting device 4 provided near the seat S, but is not connected to the position for the lifting device 4 or to the shaft 40 of the draft control lever. An operating lever 38 is provided so as to be detachable.

, 41 is a remote interlocking body, and in the figure, one of the outer receivers of the outer wire 41a is attached to a support 42 that can be adjusted and fixed to the lever guide plate 39K by a certain Bowden cable from the outer wire and the inner wire. As shown in FIG. 2, another outer support is attached to the timepiece 43K fixed to the tail wheel support 22K.

Then, both ends of the inner wire 4lb are connected to the operating lever 38.
and the detachable body 36K are connected to each other, as shown in FIG.
An inner wire 41 is connected between the engaging and disengaging body 36 and the support body 43.
A coil spring 44 wound around b is provided to bias the engaging/disengaging body 36 in the engaging direction.

In addition, Figure 2 [. 45 is a disengagement lever, which is pivoted at the midpoint of the support body 22K by a pivot 46K, and when operated counterclockwise in FIG. 2, the disengagement body 36 is operated against the spring 44. It can be released from an engaging portion separately from the lever 38.

Additionally, in FIG. 1, a 47 pakabaze connecting device urges the bendable rear cover toward the ground with respect to the fixed upper cover.

To explain the operation of the embodiment of the present invention constructed as above, in the working position shown in FIG. Therefore, the floating member 30 rotates around the horizontal shaft 31 as a fulcrum.
Since the working depth adjusting body 26 is in the locked position and the working depth adjusting body 26 is connected between the floating member 30 and the working machine frame, the tail wheel device 21 is fixed there.

Therefore, if the adjustment body 26 is operated in the extension direction, the tail wheel device 2
1 is the working part 13vC. It descends relative to the other hand, and the working depth becomes shallow at this point, and conversely, when the adjusting body 26 is operated in the retraction direction, the working depth becomes shallow.

In the specific example, plowing work is performed under the required work, but since the tail wheel device 21 is fixed in this working position, the work can be done as usual, and in particular, the engaging and disengaging body 36 is The spring 44 prevents it from coming off.

Since the tail wheel device 21 is far away from the working section 13, the so-called headlands near obstacles D such as ridges and ridges become untreated areas.

In such a case, the driver in seat S should move the control lever 38 to the first position.
In the figure, when the floating member 30 rotates to the left, the engaging/disengaging body 36 disengages from the engaging portion 34 against the spring 44 via the remote interlocking body 41, and the floating member 30 rotates around the horizontal shaft 31 as a fulcrum. Get into a position where you can move.

Since the operating lever 38 is located near the seat S, the driver can perform this detachment operation naturally.

After doing this, when the tractor body 1 is advanced toward the obstacle Dvc, the tail wheel device 21 bends around the horizontal axis 24, and as shown in FIG. It is possible to do so.

Alternatively, another method is to lift the entire work implement 9 and subsequent parts near the obstacle D by the lifting operation of the lifting device 4, back up the tractor body 1, and lower the lifting device 4. When a control lever (not shown) is operated, the tail wheel 23 lands on the top surface of the obstacle D without looking.

After that, when the operating lever 38 is operated in the same manner as described above, the engaging/disengaging body 36 is disengaged from the engaging portion 34, and the floating member 30 becomes free using the cam surface 33 as a guide surface, and the tail wheel device 21 is bent here. , the working part 13 is grounded near the obstacle D.

Regardless of which method you follow, here is the tailwheel device 2.
1 is placed in the floating position shown in FIG. 3, and the tractor body 1 is moved forward while driving the working part 13.
This means that the work can be done in the cabinet near the obstacle D.

When the tailwheel 23 passes over the top surface of the obstacle D, the tailwheel device 2F moves in the downward direction about the horizontal axis 24. Since the adjusting body 26 is connected between the machine frame and the floating member 30, the floating member 30 rotates in the opposite direction, and the engaging and disengaging body 36 engages and supports the cam surface 33. Finally, the engaging/disengaging body 36 falls into the engaging portion 34 by the spring 44, and the tail wheel device 21 is locked here again.

1. In addition, when driving on the road with the work machine 9 in the elevated position after the work is completed, or when performing parts replacement or inspection work on the work unit 13, the lifting device 4 is operated to lift. The entire working machine 9 and below is lifted as shown in Fig. 4. In this case, by employing the lift link 1T with a short arm length as the coupling device 15, the entire working machine 9 and below can be lifted up in proportion to the lifting height. Although the tail wheel device 21 still protrudes rearward as shown by reference numeral A in Fig. 4, the overall front-rear weight balance is disadvantageous. The tail wheel 23 will become an obstacle even when the part 13 is being maintained and managed.

In such a case, in the present invention, if the tail wheel device 21 is lifted around the horizontal shaft 24 while operating the operating lever 38 or the release lever 45 in the direction in which the engaging and disengaging body 36 is released against the spring 44, the floating The entire device 21 is moved forward while the member 30 is rotated and largely lifted in the height direction as indicated by reference numeral B in FIG. 36 and the floating member 3
0 is locked, and the tail wheel device 21 is fixed.

Then, the tail wheel device 21 can be moved forward by the length indicated by the symbol L in FIG. 4, which improves the front-rear weight balance and ensures stable running. It can be placed higher and further apart than the working part 13, making maintenance and management work of the working part 13 convenient.

In other words, since the tail wheel device 21 is raised independently as shown in Fig. 4, it is more advantageous to lift the tail wheel device 21 alone while operating the release lever 45. .

Then, the tail wheel device 21 is lowered by itself, and the engaging and disengaging body 3 is again lowered.
6 and the first engaging portion 34, if the lifting device 4 is set in the lowering direction, the entire work implement 9 and below is lowered relative to the tractor body 1 in the conventional manner.

The present invention is as described above, and although the tail wheel support device is provided which has the function of supporting the weight of the work machine and the function of setting the working depth, the generation of an unprocessed portion due to the tail support device is prevented. Not only can this be solved by making the tail wheel support device floating, but it can also be fixed by lifting it higher and closer to the tractor body, improving the overall front-rear weight balance. At the same time, there is an advantage that the maintenance work of the working section is also convenient.

[Brief explanation of drawings]

The figures show the specifics of the present invention, with Fig. 1 being an overall side view in the working position, Fig. 2 being a detailed side view of the floating/engaging section, and Fig. 3 being an overall side view in the floating position. 4
The figure is a side view of the entire general running or working part management system 1/Ci-, and shows a comparison between the present invention and a conventional example. 9... Working machine, 10... Tompmast as a part of the machine frame, 13... Working part, 21... Tail wheel device, 22...
... Tail wheel support, 23... Tail wheel, 24... Directly connected horizontal shaft of tail wheel device, 26... Work depth adjustment body, 30... Floater. 31... Pivot of floating member, 34, 35... Marginal joining part, 36... Marginal removal, 38.4
5...Operation or release lever.

Claims (1)

[Claims] 1. A tail wheel support body equipped with a tail wheel is connected to the body of the working machine so as to be able to rise and fall freely, and this tail wheel support body and the machine frame of the working machine are connected by a working depth adjusting body [i- A floating member is rotatably provided on the tail wheel support body, the adjustment body is pivotally connected to the floating member, and the floating member is provided with a position where the tail wheel descends to the ground and a tail wheel upwardly retreated position. The tail wheel support body has an engaging portion corresponding to each of the retaining portions, a floating action allowing portion between the retaining portions, and an engaging/disengaging body that can be freely engaged and detached from each of the engaging portions. A tail wheel floating device characterized by: