JP3602424B2 - Work machine coupling device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work machine coupling device (work machine mounting device), and more particularly to a device for directly mounting a work machine such as a rotary on a tractor.
[0002]
[Prior art]
There is a direct mounting type as a work machine connecting device (working machine mounting device) for a tractor (passenger tractor). The direct mounting type includes a three-point link hitch (referred to as a standard three-point link hitch and a special three-point link hitch). There is a two-point hitch type (see pages 312 to 317 in the Biological Production Machine Handbook (issued by Corona) issued on February 20, 1996).
A connecting portion (referred to as a two-point hitch portion, a three-point hitch portion, or the like) in a directly mounted work machine mounting device is connected (joined) by inserting a metal connecting pin (the same applies hereinafter including a connecting shaft) into a connecting hole. Because of the contact or contact between metals, the vibration and impact of the work equipment are directly propagated to the tractor side, causing whole-body vibration and local vibration (hand-arm vibration and backpack vibration). There is a risk that the livability of the operator may be impaired. 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.
Further, Japanese Utility Model Laid-Open No. 49-1409 proposes a support link in which a rubber joint formed by filling rubber between an inner and an outer cylinder is provided at a connecting portion with a machine stand or a working machine. 1).
Further, Japanese Patent Application Laid-Open No. 4-335802 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 a connecting member are provided between the connecting pin and the connecting member. There has been proposed a connecting portion damping device for a tractor working machine provided with a stopper for restricting the amount of deflection of the damping member within a predetermined range (second conventional example).
[0004]
[Problems to be solved by the invention]
A conventional example 1 is provided with rubber joints at both ends of a support link (left and right lower links). The configuration of the lower link is special and lacks versatility, and the rubber gauge in the rubber joint becomes thicker. Therefore, it can be estimated that the vibration isolating action (elastic bending amount) such as vibration can be expected. However, when the joint shaft is joined to the PTO shaft of the tractor and the working machine is driven, the joint shaft is elastically bent by the rubber joint. However, there is a problem that the bending angle in the yoke portion does not become the same angle and performs non-uniform motion (torque fluctuation).
[0005]
The second conventional example is provided with a stopper that regulates the amount of deflection of the shock-absorbing member (ring-shaped rubber), so that the above-mentioned unequal-velocity motion can be prevented. Significant design changes are required for point links and other hitches, making it difficult to apply to other working machines (rotary etc.) as a dedicated machine (vibrating subsoiler in 2 of the conventional example). is there.
The present invention divides a tractor-side connection body (for example, a connection body that shapes a three-point link) or a work implement-side connection body (for example, a rotary support bracket or a top mast), and prevents the divided parts from being divided. By joining with an elastic body having a vibration and cushioning effect, the vibration (shock) of the work equipment is suppressed from propagating to the tractor side, and the tractor dashing phenomenon is also effective without deteriorating the livability of the operator. It is an object of the present invention to provide a work implement coupling device that can perform connection between a tractor and a work implement under the same specifications and dimensions as before.
[0006]
[Means for Solving the Problems]
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, work machine connecting device is configured by dividing in the middle connecting body of the connecting member or the working machine side of the tractor side, in the divided portion, the elastic body for vibration isolation, cushioning the vibration and shock of at least the front-rear direction by interposing all SANYO, characterized in that it is joined to the divided portion, specifically, the free coupled to the free end of the top link and the left and right lower link of three-point link which is attached to the tractor A working machine connecting device that includes a connecting frame for defining an end and attaches a working machine to the connecting frame.
Dividing the middle part of the connection frame, and providing each of the divided one part and the other part of the connection frame with opposed flanges arranged so as to face each other, and each opposed flange has A mounting hole that penetrates in the opposite direction is formed, and includes an outer cylinder and an inner cylinder that is inserted into the outer cylinder and protrudes from both ends in the axial direction of the outer cylinder, and an elastic body is interposed between the inner and outer cylinders. And an assembly formed by fixing the elastic body to the inner and outer cylinders. The assembly is fitted in the mounting hole of one of the opposed flanges so that the inner cylinder projects from both axial ends of the mounting hole. The opposed flanges are connected by a bolt inserted into a mounting hole of the inner cylinder of the assembly and the other opposed flange, and a nut screwed to the bolt.
Also provided is a connecting frame which is connected to the free ends of the top link of the three-point links and the left and right lower links attached to the tractor and defines the free ends. By connecting the support brackets on the left and right sides of the lower part of the connection frame with the left and right support brackets of the work equipment,
Dividing the middle part in the front-rear direction of the support bracket, each of the divided one part and the other part of the support bracket is provided with opposed flanges arranged so as to be opposed to each other in front and rear, A mounting hole penetrating in the facing direction is formed in the facing flange. The facing flange is provided with an outer cylinder and an inner cylinder inserted through the outer cylinder and protruding from both ends of the outer cylinder in the axial direction. And an assembly in which the elastic body is fixed to the inner and outer cylinders with the body interposed therebetween, and this assembly is inserted into the mounting hole of one of the opposite flanges so that the inner cylinder projects from both axial ends of the mounting hole. And the opposed flanges are connected by bolts inserted into the mounting holes of the inner cylinder of the assembly and the other opposed flange and nuts screwed to the bolts.
Also provided is a connecting frame which is connected to the free ends of the top link of the three-point links and the left and right lower links attached to the tractor and defines the free ends. By connecting the support brackets on the left and right sides of the lower part of the connection frame with the left and right support brackets of the work equipment,
The middle part of the top mast is divided, and one of the divided parts of the top mast and the other part are arranged so as to be opposed to each other left and right, and one of the divided parts of the top mast is A mounting hole penetrating in the opposite direction is formed in the other part, and includes an outer cylinder and an inner cylinder inserted through the outer cylinder and protruding from both ends in the axial direction of the outer cylinder. And an assembly in which an elastic body is interposed and the elastic body is fixed to the inner and outer cylinders. The assembly is attached to the mounting hole of one of the divided parts of the top mast. A top mast which is internally fitted so as to protrude from both ends in the axial direction, and which is divided by a bolt inserted into a mounting hole of the inner cylinder of the assembly and the other divided part of the top mast and a nut screwed to the bolt Are also connected.
[0007]
By adopting this configuration, the detachable connection between the tractor and the work equipment can be performed under the same specifications (standards) and dimensions as before, but the vibration and shock generated during work by the work equipment Vibration-absorbing / buffering (which occurs in the front-back and up-and-down directions, of which at least the front-back direction is absorbed / mitigated) is suppressed to prevent propagation to the operator, thereby making driving operation light.
[0008]
In addition, the elastic body of the bush-type joint means, which has an elastic body interposed between the inner and outer cylindrical bodies made of metal, has a large spring constant because it acts by compression in the radial direction, and has a large load (vibration, impact, etc.). 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 damping effect. The durability of the working machine and the tractor can be maintained by interposing and joining the bush-shaped joint means to be played to the divided part where the function and action are emphasized.
[0009]
The elastic member is interposed between the inner and outer cylindrical body made of metallic described above is baked is filled between the inner and outer tubular bodies, that are secured to the cylinder length direction by bonding or the like but Ru is recommended.
With such a configuration, the characteristics of the bush-type joint described above can be sufficiently exhibited.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing the 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 hydraulic device 6 for lifting and lowering a working machine 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 portion 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.
[0011]
The work machine 2 includes a transmission case 12 at the center in the left-right direction of the machine frame (machine body) 11, and a top mast 13, which constitutes a connection body on the work machine side, is erected on the transmission case 12 by bolt fastening means 14. As shown in FIG. 2, support arms 15 protrude from the left and right sides of the transmission case 12 (perpendicularly to the paper surface), and a support bracket 16 protrudes forward halfway in the protruding direction of the left and right support arms 15. It is fixed in a shape. A side transmission case 17 is provided at a protruding end of one of the left and right support arms 15, and a side frame is provided at a protruding end of the other support arm facing the side transmission case 17. On the lower side of the side transmission case 17 and the side frame, a pawl shaft 18 is supported by a bearing (not shown) so as to be rotatable around the shaft center, and is supported on the pawl shaft 18 and the pawl shaft 18. The rotary tilling part 20 is constituted by the tilling claws 19 planted.
[0012]
The rotary tilling unit 20 is covered with a cultivation cover device 21, and the cultivation cover device 21 mainly includes a fixed cover body 22 and a movable cover body 23 that is pivotally connected to the rear end of the fixed cover body 22 by a hinge. The movable cover body 23 has a flap cover 24 that can be fixed at an adjustable angle at the rear end thereof, and the movable cover body 23 is held by an auto hanger means 25.
As shown in FIG. 2, the transmission case 12 has a PIC shaft 26 having a forwardly projecting shape, and the PIC shaft 26 and the above-mentioned PTO shaft 7 are linked to each other by a joint shaft having free joints 28 at both ends (front and rear). Here, the rotary tilling unit 20 is driven by a transmission such as a gear in the transmission case 12, a transmission shaft inserted in one support arm 15, a winding transmission in the side transmission case 17, and the like. The PTO shaft 7 can be driven to rotate around the horizontal axis by the side drive method.
[0013]
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, an extension bracket 30 detachably attached to a central rear surface of the vehicle body 4, and an extension bracket 30. The main unit comprises a top link 31 extending from an upper link point, and the working machine is operated by the action of the hydraulic device 6 by connecting the middle of the left and right lower links 29 and the left and right lift arms 5 by lift lots 32 respectively. 2 is mounted to be able to move up and down freely.
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 standardized by an arched (gate-shaped) connection frame 33 illustrated in FIG. 3 (three-point hitch). Is fixed), a hook-shaped lower scooping portion 34 is provided at the lower left and right of the connection frame 33, and a hook-shaped upper scooping portion 35 is provided at the upper center of the connection frame 33, and these scooping portions are supported by the left and right. The connection shaft 36 provided on the bracket 16 and the connection shaft 37 provided on the top mast 13 are scooped up and connected to form an automatic hitch.
[0014]
As shown in FIG. 1, when the work implement 2 is connected to the tractor 1, and in the embodiment, when the tillage work is performed by the rotary tillage unit 20, vibrations and impacts are generated based on a tillage reaction force and the like. When transmitted to the tractor 1 via the device 3, the tractor 1 affects the dashing phenomenon and the driver's occupant's 10 comfort of the driver's seat 10. Therefore, means for absorbing and mitigating the vibration and impact are provided.
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 of the left-right symmetric position. The divided portions 38 are joined with an elastic body 39 for damping and buffering an impact interposed therebetween.
[0015]
More specifically, as shown in FIGS. 5A and 5B, the divided portions 38 are joined by flange-shaped joints 40, and the joints 40 are made of metal inner and outer cylinders 41 and 42. An elastic body 39 is interposed therebetween, and includes a fastener 43 that is inserted into the inner cylindrical body 41 and fastens the opposed flanges 40A and 40B to each other.
An assembly (bushing-type joint means) 44 having an elastic body 39 interposed between the inner and outer cylinders 41 and 42 is inserted (fitted) into the mounting hole of one of the opposed flanges 40A, and the inner cylinder 41 of this assembly is inserted. A head bolt 43A, which is a fastener 43, is inserted into an insertion hole (connection hole) formed in the other flange 40B, and a nut 43C is screwed into the screw portion of the bolt with a flat washer 43B interposed. 40A and 40B are fastened.
[0016]
At this time, in the embodiment, the inner cylindrical body 41 of the assembly 44 functions as a distance collar when the nut 43C is tightened, and the elastic body 39 absorbs or alleviates vibrations and the like by elastic bending.
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, it is desirable that the space between the inner and outer cylinders 41 and 42 is filled and fixed in the cylinder length direction by baking, bonding, or the like. In addition, as the elastic body 39, a rubber-based elastic body or a resin-based elastic body can be adopted. In the case of a rubber-based body, it is desirable to adopt a JIS Shore A hardness of about 60 °.
[0017]
Furthermore, 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 portions 38 can be securely and firmly joined, the relaxation and absorption of vibration and impact can be dispersed, which is advantageous.
Referring to FIGS. 7 and 8, the middle part of the top mast 13 and the left and right support brackets 16, which are connected bodies on the working machine side, is divided (only the top mast 13 is divided in FIG. 8). The parts 38 are joined by the bush-shaped joint means 44 or the flange joint 40 interposed with the elastic body 39 shown in FIG. 5 and the like. In particular, the divided parts 38 of the left and right support brackets 16 shown in FIG. Since the elastic body 39 (the direction in which the fastener 43 is fastened) is in the front-rear direction, the vibration-proof effect is remarkable as described above with reference to FIGS.
[0018]
Although not shown, a plate-shaped (disk-shaped) elastic body (one sheet or radially having a through hole for the fastener 43 radially) is provided between the opposed flanges 40A and 40B (within the joint surface) of the connection frame 33 and the left and right support brackets 16. (Several sheets), and the fastener 43 may be tightened so that the elastic body is sandwiched between the opposed flanges 40A and 40B. Alternatively, as shown in FIG. By fixing a plate-like elastic body 39A to the lower part, the elastic body 39A can be used for vibration isolation. The elastic body 39A can also be provided in the lower scooping part 34.
[0019]
In FIGS. 9 and 10, a stay 50 made of two opposing plate members is erected on the movable cover body 23. Above the stay 50, the stay 50 is spaced horizontally by distance collar means 51, and is horizontally moved in the horizontal direction. A rotatable top (bearing body) 52 is provided around the axis.
A rod insertion hole 52A is formed in 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 into the rod insertion hole 52A in the longitudinal direction. At the insertion end of the rod 53, a retaining plate means 54 is mounted.
[0020]
The hanger rod 53 has a plurality of engagement recesses 53A formed at intervals in the longitudinal direction, and a lock lever 55 having a lock portion 55A that is detachably engageable with the engagement recess 53A. The top portion 52 is rotatably supported by a pin 55B, and the lock portion 55A is urged in an 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 against the ground can be adjusted.
[0021]
Accordingly, the lock lever 55 is pivoted about the pin 55B as a fulcrum against the biasing body 56, and the hanger rod 53 is slid while the lock portion 55A is retracted to adjust the compression amount of the elastic body 57. Therefore, 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 order to make the movable cover body 23 a stand member or the like in the hanger means 25 described above.
A mounting hole 58 is formed in the shaft support portion (rotation support portion) of the top 52 in the axial direction, and a lock body 59 having a lock portion 59A is slidably provided in the mounting hole 58, and is attached by a coil spring. It is urged by the urging body 60 in the engagement direction.
[0022]
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 move forward and backward in the mounting hole 58, while the hanger rod 53 has a lock portion 59A. Is formed with a lock recess 53B that can be freely engaged and disengaged. Therefore, the rotary work machine can be operated by setting the movable cover body 23 in a substantially vertical posture and grounding the lower part thereof, and engaging the lock portion 59A with the lock concave portion 53B to fix the hanger rod 53 so that it cannot move axially. You can standig.
[0023]
As shown in FIG. 9, a collar 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 deformable (openable) in the radial direction. The rod 53 can be fixed and held in a non-slidable manner by fitting and removing the 62. Therefore, the movable cover body 23 can also be used as a stand member by fitting and removing the collar 62 having a different length to the insertion end 53C. You can also.
The embodiment described above is merely an example, and various design changes are possible.
For example, the connecting device 3 may be a standard three-point link (Europe and the United States) instead of a special three-point link.
[0024]
Further, the working machine may be a plow or a subsoiler other than the rotary working machine. Further, the plate-like elastic bodies interposed between the opposed flanges may have different thicknesses, that is, a plurality of elastic bodies having different elastic bending amounts.
[0025]
【The invention's effect】
The present invention is as described above. The connection between the tractor and the working machine can be made the same dimensions and specifications as before, and the versatility can be improved, while suppressing the propagation of vibrations and the like accompanying the work to the tractor side (damping). ) Or can be shut 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 the upper scooping section in FIG. 2;
FIGS. 5A and 5B show a bush type coupling means, wherein FIG. 5A is a partial cross-sectional side view, and FIG.
FIGS. 6A and 6B are cross-sectional views showing the behavior of the bush type joint means, wherein FIG. 6A is an axial direction and FIG. 6B is a 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.
FIG. 9 shows a hanger means, (1) is a side view, and (2) is a partial cross-sectional view.
FIG. 10 is a sectional view of a main part of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tractor 2 Work machine 3 Connection device 13 Work machine side connection body (top mast)
16 Work unit side connector (support bracket)
33 Tractor-side connector (connection frame)
39 elastic body

Claims (4)

A work machine coupling device comprising a connection frame connected to a free end of a top link and a left and right lower link of a three-point link attached to a tractor to shape the free end, and mounting a work machine to the connection frame ;
Dividing the middle part of the connection frame, and providing each of the divided one part and the other part of the connection frame with opposed flanges arranged so as to face each other, and each opposed flange has A mounting hole that penetrates in the opposite direction is formed, and includes an outer cylinder and an inner cylinder that is inserted into the outer cylinder and protrudes from both ends in the axial direction of the outer cylinder, and an elastic body is interposed between the inner and outer cylinders. And an assembly formed by fixing the elastic body to the inner and outer cylinders. The assembly is fitted in the mounting hole of one of the opposed flanges so that the inner cylinder projects from both axial ends of the mounting hole. A work machine connecting device, wherein the opposed flanges are connected by a bolt inserted into a mounting hole of the inner cylinder of the assembly and the other opposed flange, and a nut screwed into the bolt . A connecting frame is provided that is connected to the free ends of the top link of the three-point link and the left and right lower links attached to the tractor and that defines the free ends. The top mast of the working machine is connected to the center of the connecting frame in the left-right direction In addition, by connecting the left and right support brackets of the working machine to the lower left and right sides of the connecting frame, the working machine connecting device for mounting the working machine to the connecting frame ,
Dividing the middle part in the front-rear direction of the support bracket, each of the divided one part and the other part of the support bracket is provided with opposed flanges arranged so as to be opposed to each other in front and rear, A mounting hole penetrating in the facing direction is formed in the facing flange. The facing flange is provided with an outer cylinder and an inner cylinder inserted through the outer cylinder and protruding from both ends of the outer cylinder in the axial direction. And an assembly in which the elastic body is fixed to the inner and outer cylinders with the body interposed therebetween, and this assembly is inserted into the mounting hole of one of the opposite flanges so that the inner cylinder projects from both axial ends of the mounting hole. and fitted in, that connecting the opposite flange by the inner cylinder and the bolt and nut screwed on the bolt is inserted through the mounting hole of the other opposing flange work machine connecting you wherein the assembly apparatus. A connecting frame is provided that is connected to the free ends of the top link of the three-point link and the left and right lower links attached to the tractor and that defines the free ends. The top mast of the working machine is connected to the center of the connecting frame in the left-right direction In addition, by connecting the left and right support brackets of the working machine to the lower left and right sides of the connecting frame, the working machine connecting device for mounting the working machine to the connecting frame ,
The middle part of the top mast is divided, and one of the divided parts of the top mast and the other part are arranged so as to be opposed to each other left and right, and one of the divided parts of the top mast is A mounting hole penetrating in the opposite direction is formed in the other part, and includes an outer cylinder and an inner cylinder inserted through the outer cylinder and protruding from both ends in the axial direction of the outer cylinder. And an assembly in which an elastic body is interposed and the elastic body is fixed to the inner and outer cylinders. The assembly is attached to the mounting hole of one of the divided parts of the top mast. A top mast which is internally fitted so as to protrude from both ends in the axial direction, and which is divided by a bolt inserted into a mounting hole of the inner cylinder of the assembly and the other divided part of the top mast and a nut screwed to the bolt work machine coupling device shall be the features that you are connecting the The elastic body interposed between the metal inner and outer cylinders is filled between the inner and outer cylinders, and is fixed in the cylinder length direction by baking, bonding, or the like. The working machine coupling device according to any one of claims 1 to 3 .

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