JP4331068B2 - Tillage work equipment - Google Patents

Description

  The present invention relates to a tilling work device including a cylindrical shaft for attaching a tilling claw, which is externally fitted and attached to a rotating shaft that is rotatably supported by a transmission case.

  When the rotary shaft rotates, the cylinder shaft for attaching such tilling claws rotates together with the rotating shaft, and the tilling claws plow the soil in the field. At this time, the cylindrical shaft receives a radial driving force from the rotating shaft and a thrust force from the tilling claw. For this reason, a mounting structure for restricting the cylindrical shaft from being attached to and detached from the rotating shaft by a thrust force is proposed (Patent Document 1, Patent Document 1). 2).

  In the first mounting structure, a cylindrical shaft (claw shaft body 8 in the literature) is fixed to a rotating shaft (rotary shaft 2 in the literature) via a key, and a radial driving force from the rotating shaft is transmitted to the cylindrical shaft. The cylinder shaft is prevented from coming off through a bolt (long bolt 18 in the literature) that is inserted into the inner space of the cylinder shaft and fixed to the rotation shaft, thereby restricting the attachment and detachment of the cylinder shaft from the rotation shaft. (Refer patent document 1).

  In the second mounting structure, the outer shape of the rotating shaft is formed in a hexagonal shape, the hole portion of the cylindrical shaft that is fitted on the outer shape is formed in the hexagonal hole, and these are fitted, so that the radial direction from the rotating shaft The cylinder shaft is transmitted to the cylinder shaft, and the cylinder shaft is prevented from coming off through bolts that are inserted through the inner space of the cylinder shaft and fixed to the rotation shaft, thereby restricting the attachment and detachment of the cylinder shaft from the rotation shaft. (Refer patent document 2).

Japanese Utility Model Publication No. 63-89704 Japanese Utility Model Publication No. 5-50002

  In the first mounting structure in which the cylinder shaft is fixed to the rotary shaft with the key and the bolt, when the cylindrical shaft is displaced from the axis of the rotary shaft, the cylindrical shaft is shaken, and a repeated load is applied to the bolt to cause the bolt The problem of breakage occurs. In addition, in the second mounting structure in which the rotation shaft is formed in a hexagonal shape and the cylinder shaft is fixed to the rotation shaft with a bolt, a backlash occurs in the rotation direction due to a fitting tolerance between the rotation shaft and the cylinder shaft. This looseness appears as a vibration of the cylindrical shaft, and as a result, a problem occurs in which the bolt is broken due to repeated load acting on the bolt.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a tilling work device having an attachment structure in which a bolt that fixes a cylindrical shaft that receives a thrust load does not break.

In order to achieve the above object, a tillage working device according to the present invention has a rotating shaft that is supported rotatably in a transmission case and extends in the lateral direction, and a cylindrical shaft that extends in the same direction as the rotating shaft and is attached to the tillage claw. It is fitted externally so as to be able to transmit torque, and the cylinder shaft is attached in a retaining state through a bolt that is inserted and fixed to the rotating shaft, and the inner surface of the cylinder shaft is pressed and integrated with the cylinder shaft by tightening the bolt. The spacer is fixed to the rotating shaft via the spacer, and the spacer has a plurality of members (for example, the first member 51 and the second member 55 in the embodiment) arranged in a straight line, and the plurality of members are opposed to each other. The surface portion is provided with inclined surface portions (for example, inclined surfaces 51b and 55b in the embodiment) that are inclined with respect to the central axis of the spacer, and the plurality of members are provided with insertion holes extending in the axial direction at the respective central portions. , Inclined surfaces between multiple members When the contact is made so that they face each other, the insertion holes communicate with each other, the bolt is inserted into the communication insertion hole and fixed to the rotating shaft, and the axial length of the spacer in a state where a plurality of members are in contact with each other is The cylindrical shaft is longer than the axial length of the inner space of the cylindrical shaft formed on the distal end side of the rotating shaft in a state where the cylindrical shaft is fitted on the rotating shaft .

  According to the present invention, a cylinder shaft for attaching a tillage nail is fitted on the rotating shaft so as to be able to transmit torque, and the cylinder shaft is attached in a state of being prevented from coming off via the bolt and integrated with the cylinder shaft by tightening the bolt. When the bolt is tightened by being fixed to the rotating shaft via the spacer, the spacer moves in the radial direction and is integrated with the cylindrical shaft, and is fixed to the rotating shaft. For this reason, the center axis line of the cylinder shaft can be arranged substantially concentrically with that of the rotating shaft, and the deflection of the cylinder axis can be eliminated. As a result, it is possible to eliminate a situation in which a load is repeatedly applied to the bolt inserted through the spacer, and it is possible to eliminate the possibility that the bolt is loosened or the bolt is broken. In addition, when the cylindrical shaft is externally fitted to the rotating shaft and a pin is inserted between these shafts to connect the cylindrical shaft to the rotating shaft, the cylindrical shaft is integrated with the rotating shaft by the spacer. Even if this force is applied, this force is transmitted to the rotating shaft through the spacer, so that the force in the thrust direction does not act on the pin. For this reason, the force which acts on a pin can be made only into the driving force from a rotating shaft. As a result, the hole provided in the cylindrical shaft for inserting the pin is not formed into a long hole that is cut and extended in the axial direction of the cylindrical shaft, and the backlash generated when the cylindrical shaft moves in the axial direction. Can be prevented, and the breakage of the bolt can be surely prevented.

  In addition, when the bolts that pass through the spacers are tightened by forming the opposing surface portions between the plurality of members into the inclined surface portions, the adjacent inclined surface portions come into contact with each other and the tip portions of the rotating shaft come into contact with each other. And the end of the member facing this. When the bolt is further tightened, slippage occurs between the contacted inclined surface portions, and adjacent members move outward. As a result, the inner surface of the cylindrical shaft is pressed by the moved member, and the spacer is integrated with the cylindrical shaft. And a spacer and a cylinder axis | shaft can be easily integrated only by tightening a volt | bolt.

Further, the axial length of the spacer in a state where a plurality of members are in contact with each other is the axial length of the inner space of the cylindrical shaft formed on the distal end side of the rotating shaft in a state where the cylindrical shaft is externally fitted to the rotating shaft. By extending the length of the cylinder shaft, substantially the entire area of the inner surface of the cylinder shaft forming the inner space in the direction of the cylinder axis is pressed from the inside of the cylinder shaft to the outside by the spacer, so that the cylinder shaft and the spacer are integrated. The central axis of the rotation axis can be arranged on a substantially concentric axis with that of the rotation axis.

The spacer is made of an elastically deformable material so that when the bolt is tightened, the spacer is compressed and deformed along the tightening direction of the bolt, and is expanded in a direction perpendicular to the tightening direction so that the spacer becomes the inner surface of the cylinder shaft. Press. For this reason, the spacer which integrates a spacer and a cylinder shaft can be made into a simple structure, and an inexpensive spacer can be provided.

  According to the tillage work device according to the present invention, a cylinder shaft for attaching a tillage nail is externally fitted to the rotating shaft so that torque can be transmitted, and the cylinder shaft is attached in a retaining state via a bolt, and the cylinder shaft is tightened by tightening the bolt. It is possible to provide a tilling work device that does not break the bolt that fixes the cylindrical shaft that receives the thrust load.

  Hereinafter, a preferred embodiment of a tillage work apparatus according to the present invention will be described with reference to FIGS. The present embodiment will be described by taking, as an example, a tillage work apparatus that performs middle tillage, weeding, etc., among the tillage work apparatuses.

  As shown in FIG. 1 (side view) and FIG. 2 (back view), the tillage work device 1 has a main frame 3 extending in the width direction of the device (hereinafter referred to as the left-right direction). It is attached to the rear part of the traveling machine body (not shown) via the connecting part 5 provided. A gear box is provided at the center of the main frame 3 in the left-right direction so that power is transmitted from a PTO shaft (not shown) of the traveling machine body to an input shaft (not shown) provided in the gear box. It has become.

  Middle tillage units 20 are provided at the left and right ends of the main frame 3. The middle tilling unit 20 is disposed at the lower end portion of the transmission case 7 pivoted to the lower portion of the main frame 3 so as to be swingable in the front-rear direction. The middle tilling unit 20 includes a middle tilling rotor 21 that is rotatably supported at the lower end of the transmission case 7. As shown in FIG. 3A, the middle tilling rotor 21 is rotatably supported on the lower side of the transmission case 7 and is fitted on the tip of the rotating shaft 8 extending in the left-right direction so as to attach the tilling claw. The shaft 30 and a plurality of tilling claws 40 attached to the tube shaft 30 are configured. The rotating shaft 8 is rotated by receiving power transmitted to the input shaft via a power transmission mechanism (not shown), and an intermediate portion of the rotating shaft 8 is arranged in a direction perpendicular to the central axis. An extending pin hole 9 is provided, and the rotating shaft 8 is provided with a screw hole (not shown) in the axial direction.

  The cylindrical shaft 30 includes a first shaft portion 31 that is fitted on the rotary shaft 8 and a second shaft portion 35 that is coupled to the left end portion of the first shaft portion 31. The first shaft portion 31 and the second shaft portion 35 are formed to have substantially the same outer diameter dimension, and through holes 31a and 35a having substantially the same inner diameter dimension are formed inside each. For this reason, if the left end surface of the 1st axial part 31 and the right end surface of the 2nd axial part 35 are joined so that there may be no level | step difference in the outer peripheral surfaces 31b and 35b of the 1st axial part 31 and the 2nd axial part 35, it will be a through-hole. 31a and 35a are connected continuously.

  Flange portions 32 and 36 are provided at the left end portion of the first shaft portion 31 and the right end portion of the second shaft portion 35 so as to protrude radially outward. A plurality of holes (not shown) are formed in the flange portions 32 and 36, and the flange portions 32 and 36 are connected by bolts and nuts fastening means 33 through the holes in a state where the flange portions 32 and 36 are joined. When fastened, the first shaft portion 31 and the second shaft portion 35 can be connected. A communication hole 34 that can communicate with the pin hole 9 formed in the rotary shaft 8 is formed at the right end portion of the first shaft portion 31. For this reason, the right end portion of the first shaft portion 31 is externally fitted to the rotary shaft 8, and the pin 11 shown in FIG. 3 (b) is inserted into these holes in a state where the pin hole 9 and the communication hole 34 are communicated. Then, the driving force of the rotating shaft 8 can be transmitted to the first shaft portion 31 via the pin 11 to rotate the cylindrical shaft 30. In order to restrict the pin 11 from being pulled out, a stopper 12 shown in FIG. 3B can be attached to the tip of the pin 11.

  A plurality of holders 37 are provided on the outer peripheral surfaces of the first shaft portion 31 and the second shaft portion 35 so as to be arranged at predetermined intervals in the left-right direction and project radially. A tilling claw 40 is detachably attached to the holder 37. As shown in FIGS. 1 and 2, the tilling claw 40 has a proximal end side that extends linearly and a distal end side that is bent in the left-right direction. For this reason, when the middle tilling rotor 21 rotates and the tilling claws 40 till the soil in the field, a force having a thrust direction component acts on the cylindrical shaft 30 from the tip side of the tilling claws 40.

  As shown in FIG. 3B (side view), a spacer 50 for attaching the cylindrical shaft 30 to the rotary shaft 8 is provided inside the cylindrical shaft 30. That is, the pin 11 and the spacer 50 described above constitute an attachment structure for attaching the cylindrical shaft 30 to the rotary shaft 8. The spacer 50 is made of a metal material and includes a cylindrical first member 51 and a second member 55. The first member 51 has an end surface 51a extending in the vertical direction at the right end, an inclined surface 51b extending in the oblique direction at the left end, and an insertion hole 51c extending in the axial direction at the center. Yes. On the other hand, the second member 55 is formed with an inclined surface 55b extending in an oblique direction at the right end, an end surface 55a extending in the vertical direction at the left end, and an insertion hole 55c extending in the axial direction at the center. is doing. The outer diameters of the first member 51 and the second member 55 are substantially the same, and the inclined surfaces 51b and 55b of these members are inclined with the same inclination angle θ with respect to the central axis. The insertion holes 51c and 55c formed in the first member 51 and the second member 55 have substantially the same inner diameter. For this reason, when the inclined surfaces of the first member 51 and the second member 55 are opposed to each other and the inclined surfaces are brought into contact with each other so that there is no step between the outer peripheral surfaces, the insertion holes 51c and 55c are continuous. Connected. Note that the inclination angle θ of the inclined surfaces 51b and 55b can be designed to any angle as long as it is within an acute angle range.

  The outer diameter dimensions of the first member 51 and the second member 55 are smaller than the inner diameter dimensions of the through holes 31 a and 35 a of the first shaft portion 31 and the second shaft portion 35. For this reason, the spacer 50 can be inserted into and removed from the through holes 31a and 35a. Further, the outer diameter of the shaft portion 60a of the bolt 60 and the insertion hole 51c of the spacer 50 are determined by the gap between the outer diameter of the spacer 50 (the first member 51 and the second member 55) and the inner diameter of the through holes 31a and 35a of the cylindrical shaft 30. The outer diameter of the spacer 50 and the inner diameter of the through holes 31a and 35a are set so that the gap between the first and second holes 55c is increased. Furthermore, the axial length of the spacer (hereinafter referred to as “integrated spacer 50”) in which the inclined surfaces 51b and 55b of the first member 51 and the second member 55 are brought into contact with each other is the integrated spacer 50. Is inserted into the cylindrical shaft 30 so that the left end portion of the spacer 50 protrudes from the cylindrical shaft 30 with a predetermined length.

  The spacer 50 configured in this manner is attached as follows. As shown in FIGS. 3A and 3B, the cylindrical shaft 30 is externally fitted to the rotary shaft 8, the pin hole 9 and the communication hole 34 are in communication with each other, and the pin 11 is inserted into these holes. . Then, the stopper 12 is attached to the tip of the pin 11 protruding from the cylindrical shaft 30. Then, the first member 51 and the second member 55 are arranged on the distal end side of the cylindrical shaft 30 so that the inclined surfaces 51 b and 55 b of the spacer 50 face each other. Then, these members are inserted into the cylindrical shaft 30.

  Then, as shown in FIG. 3C, the bolt 60 is inserted into the insertion holes 51 c and 55 c of the spacer 50, and the tip of the bolt 60 is abutted against the screw hole of the rotary shaft 8. When the bolt 60 is inserted into the insertion holes 51c and 55c, the spring washer 63 and the lock plate 61 are previously inserted into the shaft portion 60a of the bolt 60 from the head 60b side. The lock plate 61 is made of a sheet metal material, and includes a base portion 61a that fits outside the holder 37 and an arm portion 61b that extends from the base portion 61a. A shaft portion 60a of the bolt 60 is provided at the tip of the arm portion 61b. A hole (not shown) for insertion is formed. Then, when the bolt 60 is turned and tightened, the second member 55 moves to the first member 51 side by the movement of the head 60b of the bolt 60 toward the rotating shaft, and the inclined surface 55b of the second member 55 The right end surface 51 a of the first member 51 comes into contact with the tip end portion of the rotating shaft 8, in contact with the inclined surface 51 b of the first member 51.

  When the bolt 60 is further tightened, as described above, the outer diameter of the shaft portion 60a of the bolt 60 and the insertion hole 51c of the spacer 50 from the gap between the outer diameter of the spacer 50 and the inner diameters of the through holes 31a and 35a of the cylindrical shaft 30. , 55c so that the first member 51 and the second member 55 extend radially outward of the cylindrical shaft 30 along the inclined surfaces 51b, 55b, as shown in FIG. Shift. As a result, the first member 51 and the second member 55 press the inner surface of the tube shaft 30 from the inside to the outside, and the spacer 50 is integrated with the tube shaft 30. At the same time, the spacer 50 is attached to the rotary shaft 8 through the bolt 60 in a state of preventing the spacer 50 from coming off. Then, as shown in FIG. 3 (e), the base 61a of the lock plate 61 is externally fitted and attached to the holder 37, and the tip of the arm 61b of the lock plate 61 is wrapped around the head 60b of the bolt 60. Bend it. As a result, the movement of the bolt 60 in the direction away from the rotary shaft 8 is restricted by the lock plate 61, and the bolt 60 can be prevented from loosening.

  As described above, the spacer 50 is attached to the rotary shaft 8 in a state of being prevented from coming off via the bolt 60 and is integrated with the cylindrical shaft 30 so that the central axis of the cylindrical shaft 30 is substantially concentric with that of the rotary shaft 8. It can arrange | position on an axis | shaft and the shake of the cylinder axis | shaft 30 can be eliminated. As a result, it is possible to eliminate a situation in which a load is repeatedly applied to the bolt 60 inserted through the spacer 50 due to the deflection of the cylindrical shaft 30, and it is possible to eliminate a situation where the tightening of the bolt 60 is loosened or the bolt 60 is broken. it can. Further, since the cylindrical shaft 30 is fixed to the rotating shaft 8 via the spacer 50, when a thrust force acts on the cylindrical shaft 30, this force acts on the rotating shaft 8 via the spacer 50. For this reason, the force in the thrust direction does not directly act on the pin 11, and the force acting on the pin 11 can be limited to the driving force from the rotating shaft 8. As a result, the communication hole 34 provided in the cylindrical shaft 30 for inserting the pin 11 is not formed into a long hole that is cut and extended in the axial direction of the cylindrical shaft 30, and the cylindrical shaft 30 is not axially formed. Generation | occurrence | production of the play which arises by moving can be prevented, and the failure | damage of the volt | bolt 60 can be prevented reliably.

  In the above-described embodiment, the spacer 50 is configured by the two members of the first member 51 and the second member 55. However, the spacer 50 is composed of three or more members according to the length of the cylindrical shaft 30. You may comprise so that it may consist of. Further, as a method for transmitting torque of the cylindrical shaft 30, the rotary shaft 8 may be formed into a square shape or subjected to spline processing.

  As shown in FIG. 4, the spacer 70 is formed of an elastically deformable material and has an outer diameter that can be inserted into and removed from the through holes 31a and 35a of the cylindrical shaft 30, and the shaft main body 70a. It has a plate member 70b attached to one end side end portion and capable of contacting the end portion of the second shaft portion 35 (tubular shaft 30). The shaft main body 70a is formed of a synthetic resin material such as rubber, for example. The spacer 70 is formed with an insertion hole 70c through which the bolt 60 passes along the axis. The length L1 of the shaft body 70a is longer than the length L2 from the tip of the rotating shaft 8 to the outer end of the cylindrical shaft 30. The outer diameter φ and the length L1 of the shaft main body 70a have a relationship that the outer diameter φ becomes larger than the inner diameter of the cylindrical shaft 30 when the shaft main body 70a is compressed in the axial direction and the length becomes L2. . As a result, when the shaft main body portion 70a is inserted into the cylindrical shaft 30 and the bolt 60 is tightened so that the plate member 70b contacts the end portion of the second shaft portion 35 (cylinder shaft 30), the outer diameter of the shaft main body portion 70a. And the outer peripheral surface of the shaft main body portion 70 a presses the inner surface of the cylindrical shaft 30, so that the shaft main body portion 70 a is integrated with the cylindrical shaft 30. The shaft main body 70a is attached to the rotating shaft 8 via a bolt 60 in a state of being prevented from coming off. For this reason, the cylindrical shaft 30 can be fixed to the rotating shaft 8 similarly to the spacer 50 shown in FIG. Further, by making the shaft main body portion 70a made of an elastically deformable material, it is possible to provide an inexpensive spacer with a simple configuration.

The side view of the tillage working device concerning one embodiment of the present invention is shown. The back view of this tilling work apparatus is shown. The side view of the attachment structure of the middle rod rotor provided in this tilling work apparatus is shown. It is a side view which shows the other example of the attachment structure of a center rotor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plowing work apparatus 7 Transmission case 8 Rotating shaft 30 Cylinder shaft 40 Tillage claw 50, 70 Spacer 51 1st member (member)
51b, 55b Inclined surface (inclined surface portion)
55 Second member (member)
60 volts

Claims (1)

A cylindrical shaft for mounting a tilling nail is externally fitted to a rotary shaft that is supported by the transmission case so as to be rotatable and extends in the lateral direction, and extends in the same direction as the rotary shaft so that torque can be transmitted. The bolt is fixed in a state where it is prevented from coming off through a bolt fixed to the rotating shaft, and the inner surface of the cylindrical shaft is pressed by tightening the bolt to be fixed to the rotating shaft via a spacer integrated with the cylindrical shaft. Let
The spacer includes a plurality of members arranged in a straight line, and includes an inclined surface portion that is inclined with respect to the central axis of the spacer on a surface portion on the opposite side between the plurality of members.
Each of the plurality of members is provided with an insertion hole extending in the axial direction at each central portion.When the plurality of members are brought into contact with each other so that the inclined surface portions face each other, the insertion holes communicate with each other, and the bolt , Inserted through the communicating insertion hole and fixed to the rotating shaft,
The axial length of the spacer in a state in which the plurality of members are in contact with each other is an axis of the inner space of the cylindrical shaft formed on the distal end side of the rotating shaft in a state where the cylindrical shaft is fitted on the rotating shaft. A tilling work device characterized by being longer than the direction length .

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