JP2002095305A - Implement connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the riding comfortableness by damping (insulating) the vibration, etc., transmitted to a tractor. SOLUTION: The implement-side connection member 13 of the connecting device 3 for connecting an implement 2 to a tractor 1 is divided into sections and an elastic material is placed between the sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine connecting device (working machine mounting device), and more particularly to a device for directly mounting a working machine such as a rotary on a tractor.

[0002]

2. Description of the Related Art There is a direct mounting type as a working machine connecting device (working machine mounting device) of a tractor (riding tractor). The direct mounting type includes a three-point link hitch (a standard three-point link hitch and a special three-point link). There is a hitch type) and a two-point hitch type (pages 312 to 317 in the Biological Production Machine Handbook (published by Corona) issued on February 20, 1996).
Page). A connecting portion (referred to as a two-point hitch portion, a three-point hitch portion, or the like) of the directly mounted work machine mounting device is connected (joined) by inserting a metal connecting pin (the same applies hereinafter including the connecting shaft) into the connecting hole. Because of the contact or contact between metals, the vibration and shock of the work equipment are directly propagated to the tractor side, causing the whole body vibration and local vibration (hand-arm vibration and backpack vibration), There is a possibility that the livability of the operator may be deteriorated (the whole body vibration refers to a vibration in which the whole body or the trunk is shaken and an influence on a living body is considered, and together with the local vibration, pages 304 to 306 of the publication described above. Page).

[0003] The vibration (shock) and noise are problems in agricultural mechanization, and in a working machine connected to a tractor, dashing of the tractor has been caused to cause cracks and breakage of a vehicle body. Japanese Utility Model Laid-Open Publication No. 49-1409 proposes a support link in which a rubber joint between inner and outer cylinders is filled with rubber at a connecting portion with a machine stand or a working machine. 1). Further, Japanese Patent Laid-Open No. 4-3
Japanese Patent No. 35802 discloses a tractor working machine having a connecting member connected to a three-point link hitch of a tractor via a connecting pin, wherein a cushioning member and an amount of bending of the buffering member are provided between the connecting pin and the connecting member. Of a connecting portion of a tractor working machine provided with a stopper that regulates the pressure within a predetermined range (2 of the conventional example).

[0004]

One of the prior arts is one in which rubber joints are provided at both ends of a support link (left and right lower links). The configuration of the lower link is special, and the versatility is lacking. Since the rubber gauge in the rubber joint is thickened, it can be estimated that vibration-proofing action (elastic deflection) can be expected, but when the joint shaft is joined to the PTO shaft of the tractor to drive the working machine, There is a problem in that the bending angle at the yoke portion of the joint shaft does not become equiangular due to the elastic deformation of the rubber joint, and the rubber joint moves unequally (torque fluctuation).

The conventional example 2 is a cushioning member (ring-shaped rubber).
The above-mentioned unequal velocity movement can be prevented because of the provision of the stopper that regulates the amount of deflection of the wing, but the structure is complicated and the design of the work machine or tractor (including the hitch such as a three-point link) is significantly changed. However, there is a problem that it is difficult to apply it to any other working machine (such as a rotary machine) as a dedicated machine (vibrating subsoiler in the second conventional example). The present invention divides a tractor-side connecting body (for example, a connecting body that shapes a three-point link) or a working machine-side connecting body (for example, a rotary support bracket or a top mast),
By joining an elastic body having an anti-vibration / buffering action to the divided portion, the vibration (shock) of the working machine is prevented from propagating to the tractor side, and the tractor can be moved without deteriorating the livability of the operator. It is an object of the present invention to provide a work implement coupling device in which the tractor and the work implement can be connected under the same specifications and dimensions as before, while effectively preventing the dashing phenomenon.

[0006]

SUMMARY OF THE INVENTION The present invention employs the following technical means to achieve the above object in a working machine coupling device for mounting a working machine on a tractor. That is, the work implement coupling device according to the first aspect is configured by dividing the tractor-side connection body or the work equipment-side connection body in the middle, and at least vibrates and buffers vibrations and shocks in the front-rear direction. The divided portions are joined with an elastic body interposed therebetween.

[0007] By adopting such a configuration, the detachable connection between the tractor and the working machine can be performed under the same specifications (standards) and dimensions as before, but occurs during work by the working machine. Vibration / shock (occurs in front and back and up and down, of which at least the front and back direction is absorbed and moderated)
To prevent the vibration from propagating to the operator
Driving control is lightened. Further, the divided portions in the present invention are joined by a flange-shaped joint, and the flange-shaped joint has an elastic body interposed between the inner and outer cylinders made of metal, and is inserted into the inner cylinder to be opposed. It is recommended to be configured with fasteners for fastening the flanges together (claim 2).

By adopting such a configuration, the elastic body of the bush-type joint means having the elastic body interposed between the inner and outer cylinders made of metal works by compressing in the radial direction and therefore has a large spring constant. Has a large load (vibration, impact, etc. load)
On the other hand, the elastic body has a small spring constant in the axial direction and the torsion direction due to shearing, and exhibits a large vibration-proof effect. By connecting the joint means to the divided part where the function and action are emphasized, the durability of the working machine and the tractor can be maintained.

Further, it is recommended that a plurality of the flange-type joints for joining the divided portions in the above-mentioned claim 1 or 2 be provided on the opposed flange in a radial arrangement (claim 3). Further, the elastic body interposed between the metal inner and outer cylinders in claim 2 is filled between the inner and outer cylinders and fixed in the cylinder length direction by baking, bonding, or the like. (Claim 4). With such a configuration, the characteristics of the bush-type joint described above can be sufficiently exhibited.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an overall configuration of a working machine coupling device 3 exemplified by a special three-point link in which a working machine 2 exemplified by a side drive type rotary is detachably mounted on a tractor 1 exemplified by a passenger in a wheel type. I have. The tractor 1 has a work unit lifting hydraulic device 6 having left and right lift arms 5 mounted on the vehicle body 4 and a PTO shaft 7 projecting rearward (rightward in the figure) at the lower rear surface of the vehicle body 4. The left and right rear wheels 8 are covered with fenders 9, and a driver's seat 10 is provided between the left and right fenders 9.

The work machine 2 has a transmission case 12 at the center in the left-right direction of the machine frame (body) 11.
2, a top mast 13 constituting a connecting body on the working machine side is erected by bolt fastening means 14, and as shown in FIG.
Are protruded (perpendicular to the plane of the paper), and the support bracket 1
6 is fixed in a protruding forward direction. A side transmission case 17 is provided at the projecting end of one of the support arms 15 on the left and right support arms 15.
A side frame is provided below the projecting end of the other support arm opposite to the side 7, and a pawl shaft 18 is rotatable about this axis below the side transmission case 17 and the side frame. A rotary tilling unit 20 is formed by the claw shaft 18 and the cultivation claw 19 implanted on the claw shaft 18.

The rotary tilling unit 20 includes a cultivating cover device 2
The tilling cover device 21 is mainly composed of a fixed cover body 22 and a movable cover body 23 pivotally connected to the rear end of the fixed cover body 22 by a hinge. The rear end has a flap cover 24 whose angle can be adjusted and fixed freely, and the movable cover body 23 is held by an auto hanger means 25. Transmission case 12
The PIC shaft 26 has a forwardly projecting shape as shown in FIG.
The PIC shaft 26 and the above-mentioned PTO shaft 7 are interlocked and connected by a joint shaft having a free joint 28 at both ends (front and rear). Here, the rotary tilling unit 20 is driven by a gear or the like in the transmission case 12. It can be rotationally driven by a PTO shaft 7 around a horizontal axis by a side drive system via a transmission, a transmission shaft inserted in one support arm 15, a winding transmission in a side transmission case 17, and the like.

The work implement coupling device 3 includes left and right lower links 29 extending rearward from link points at lower left and right portions of the vehicle body 4.
And an extension bracket 30 detachably attached to a central rear surface of the vehicle body 4, and a top link 31 extending from an upper link point of the extension bracket 30.
The middle of the left and right lower links 29 and the left and right lift arms 5
The work implement 2 is mounted so as to be able to move up and down by the action of the hydraulic device 6 by linking the work machine 2 with the lift lot 32. The right and left hitch points (free ends) of the left and right lower links 29 and the hitch points (free ends) of the top link 31 are:
Arch-shaped (gate-shaped) connecting frame 33 exemplified in FIG.
The connecting frame 33 is provided with a hook-shaped lower scooping portion 34 at the lower left and right sides of the connecting frame 33, and a hook-shaped upper scooping portion 35 is provided at the upper center of the connecting frame 33.
A connecting shaft 36 provided on the left and right support brackets 16 and a connecting shaft 37 provided on the top mast 13
Are auto-hitch by scooping up and connecting each of them.

As shown in FIG. 1, when the working machine 2 is connected to the tractor 1 and the tilling operation is performed by the rotary tilling unit 20 in the embodiment, vibrations and impacts are generated based on the tilling reaction force or the like. When this is transmitted to the tractor 1 via the coupling device 3, the dashing phenomenon of the tractor 1
Means for absorbing and mitigating these vibrations and shocks are provided because they affect the comfort of the driver's seat 10 for the operator. In the embodiment illustrated in FIGS. 1 to 3, the connection frame 33, which is a connection body on the tractor 1 side, is divided at an intermediate portion in the left-right symmetric position.
The divided portions 38 are joined with an elastic body 39 interposed at least for damping and buffering vibration and shock in the front-back direction.

More specifically, FIG. 5 (1)
As shown in (2), the divided portion 38 is formed by the flange-shaped joint 4
The elastic member 39 is interposed between the inner and outer cylindrical bodies 41 and 42 made of metal, and is inserted into the inner cylindrical body 41 to fasten the opposed flanges 40A and 40B to each other. Fastener 43 is provided. An assembly (bushing-type joint means) 44 in which an elastic body 39 is interposed between the inner and outer cylindrical bodies 41 and 42 in the mounting hole of one of the opposed flanges 40A.
Is inserted (fitted), and the fastener 4 is inserted into an insertion hole (connection hole) formed in the inner cylindrical body 41 of the assembly and the other flange 40B.
3, the opposed flanges 40A and 40B are fastened by inserting a headed bolt 43A and screwing a nut 43C into the threaded portion of the bolt with a flat washer 43B interposed therebetween.

At this time, in the embodiment, the inner cylinder 41 of the assembly 44 functions as a distance collar when the nut 43C is tightened, and the elastic body 39 absorbs or reduces vibrations and the like due to the elastic bending of the elastic body 39. It is. That is, as shown in FIG. 6A, the bush type coupling means 44 has a small spring constant in the axial direction F and in the torsion direction F1 as shown in FIG. Here, a great anti-vibration effect is exhibited. In order to ensure that this vibration-proof effect is exerted, the inner and outer cylinders 41, 4
Desirably, it is filled in between the two and fixed in the cylinder length direction by baking, bonding or the like (including that it is not necessary to fix). System elastic material can be adopted.
It is desirable to use one having an S Shore A hardness of about 60 °.

Further, as shown in FIG. 5 (2), it is recommended that a plurality of sets of the bush type joint means 44 be provided on the opposed flanges 40A and 40B in a radial arrangement. As a result, while the divided portion 38 can be securely and firmly joined, the absorption and relaxation of vibration and impact can be dispersed, which is advantageous. Referring to FIGS. 7 and 8, the top mast 13 which is a connecting body on the working machine side is shown.
And the middle part of the left and right support brackets 16 (only the top mast 13 is divided in FIG. 8).
The divided portion 38 is connected to the bush-shaped joint means 44 through the flange joint 40 with the elastic body 39 shown in FIG.
In particular, in the divided portion 38 of the left and right support brackets 16 shown in FIG. 7, since the elastic body 39 (the fastening direction of the fastener 43) is in the front-rear direction, FIG. As described above with reference to (2), the anti-vibration effect is remarkable.

Although not shown, opposed flanges 40A of the connection frame 33 and the left and right support brackets 16 are provided.
A plate-shaped (one or several disc-shaped) elastic bodies (one or several discs having radially inserted holes of the fasteners 43) are interposed between the 40Bs (within the joining surface), and the elastic bodies are sandwiched between the opposed flanges 40A and 40B. The fastener 43 may be tightened as described above, or the plate-like elastic body 39A may be fixed to the fitting recess of the scooping portion 35 as shown in FIG. Vibration can be prevented, and the elastic body 39A can be provided in the lower scooping section 34.

In FIG. 9 and FIG. 10, a stay 50 made of two opposing plate members is provided upright on the movable cover 23, and the stay 50 is provided with a distance collar means 51 provided above the stay 50 so that the left and right sides can be maintained. A rotatable top (bearing body) 52 is provided around the horizontal axis in the direction. A rod insertion hole 52A is formed through the top 52 in the radial direction, and a hanger rod 53 having one end (upper end) pivotally attached to the machine frame 11 is slidably inserted in the rod insertion hole 52A in the longitudinal direction. At the insertion end of the rod 53, a retaining plate means 54 is mounted.

The hanger rod 53 has a plurality of engaging recesses 53A formed at intervals in the longitudinal direction, and has a lock portion 55A which is detachable from the engaging recess 53A. The lever 55 is rotatably supported on the top 52 by a pin 55B, and the lock portion 55A is urged in the engagement direction by an urging body 56 represented by a coil spring. Further, an elastic body 57 represented by a coil spring is fitted on the hanger rod 53, and the compression state of the elastic body 57 can be adjusted by sliding of the hanger rod 53 and engagement of the lock portion 55A with the engagement recess 53A. Here, the elastic force of the movable cover body 23 at the ground can be adjusted.

Accordingly, the lock lever 55 is pivoted about the pin 55B against the urging body 56, and the hanger rod 53 is slid while the lock portion 55A is retracted to reduce the compression amount of the elastic body 57. After the adjustment, the elasticity is adjusted by advancing and engaging the lock portion 55A with the engagement recess 53A of the rod 53. 9 and 10, the following technical means are employed in the above-mentioned hanger means 25 to make the movable cover body 23 a stand member or the like. A mounting hole 58 is formed in a shaft support portion (rotation support portion) of the top 52 in the axial direction.
Is slidably mounted inside and is urged in the engagement direction by an urging body 60 represented by a coil spring.

Further, an operation lever 61 is mounted on the lock body 59 via a pin 61A, and by operating the lever 61, the lock body 59 can be advanced and retracted in the mounting hole 58.
On the other hand, the hanger rod 53 is formed with a lock concave portion 53B to which the lock portion 59A is detachable. Therefore, the movable cover body 23 is set to a substantially vertical posture, and the lower part thereof is grounded,
In this state, the lock portion 59A is engaged with the lock concave portion 53B to fix the hanger rod 53 so that the shaft cannot move.
The rotary working machine can be standigged.

As shown in FIG. 9, a knob 62A is provided at the insertion end 53C of the hanger rod 53 between the retaining plate means 54 and the stay 50, and is elastically deformed in the radial direction (openable. )), The rod 53 can be fixedly held in a non-slidable manner.
The movable cover 23 can also be used as a stand member by fitting and removing the collars 62 having different lengths to the insertion end 53C. The embodiment described above is merely an example, and various design changes are possible. For example, connecting device 3
May be a standard three-point link (Western style) instead of a special three-point link.

The working machine may be a plow or a subsoiler other than the rotary working machine. Further, the plate-like elastic members interposed between the opposed flanges may have different thicknesses, that is, a plurality of elastic members having different elastic bending amounts.

[0025]

The present invention is as described above. The connection between the tractor and the working machine can be made to the same size and specifications as before and the versatility can be improved, while transmitting vibrations and the like accompanying the work to the tractor side. Can be suppressed (attenuated) or cut off.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of the present invention.

FIG. 2 is a side view showing a main part of the present invention.

FIG. 3 is a front view of the connecting body in FIG. 2;

FIG. 4 is a side view of an upper scooping unit in FIG. 2;

FIGS. 5A and 5B show a bush type coupling means, in which (1) is a side view of a partial cross section, and (2) is a front view showing only a part thereof.

FIG. 6 is a sectional view showing the behavior of the bush type joint means;
(1) is the axial direction, and (2) is the torsion direction.

FIG. 7 is a side view of a main part showing another example (second example) according to the present invention.

FIG. 8 shows another example (third example) according to the present invention, wherein (1) is a side view and (2) is a cross-sectional view.

9 shows a hanger means, (1) is a side view, (2)
Is a partial sectional view.

FIG. 10 is a sectional view of a main part of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 2 Working machine 3 Connecting device 13 Working machine side connecting body (top mast) 16 Working machine side connecting body (support bracket) 33 Tractor side connecting body (connecting frame) 39 Elastic body

Claims (4)

[Claims] In a working machine connecting device for mounting a working machine on a tractor, a connecting body on the tractor side or a connecting body on the working machine side is divided in the middle, and at least vibration and longitudinal vibration and A working machine coupling device, wherein said divided portions are joined together with an elastic body for damping and buffering an impact interposed therebetween. 2. The split part is joined by a flange-type joint, and the flange-type joint has an elastic body interposed between the inner and outer cylinders made of metal, and is inserted into the inner cylinder to be opposed. The work implement coupling device according to claim 1, further comprising a fastener for fastening the flanges to each other. 3. The work implement coupling device according to claim 1, wherein a plurality of flange-shaped joints for joining the divided portions are provided on the opposed flanges in a radial arrangement. 4. The elastic body interposed between the inner and outer cylinders made of metal is filled in between the inner and outer cylinders and fixed in the cylinder length direction by baking, bonding or the like. The work machine coupling device according to claim 2, characterized in that: