JP5462826B2 - Plowing depth adjustment mechanism of rotary tiller - Google Patents

Description

  The present invention includes a screw shaft having a male screw portion on an outer peripheral surface, a cylindrical body having a female screw portion screwed to the male screw portion of the screw shaft on an inner peripheral surface, and one upper end of the screw shaft or the cylindrical body. A handle portion fixed to the handle portion, a support body rotatably supporting the screw shaft or the cylinder body to which the handle portion is fixed, and a grounding member connected to the other of the screw shaft or the cylinder body. The present invention relates to a tilling depth adjusting mechanism of a rotary tiller that lifts and lowers the grounding member by rotating a screw shaft or a cylindrical body by rotating a part.

  As a tilling depth adjusting mechanism provided in a conventional rotary tiller, for example, the one shown in Patent Document 1 is known. Here, a tail wheel (an example of a grounding member) is provided at the lower end of the cylinder, and the tail wheel is moved up and down by rotating the handle portion and screwing the screw shaft with respect to the cylinder. To adjust the tillage depth arbitrarily. In order to prevent the screw shaft from rotating freely due to vibration or impact during tillage work, changing the height of the tail wheel and changing the tilling depth, the support that supports the screw shaft rotatably A plate spring is fixed to the body, and the plate spring is constantly pressed against a retaining collar provided at the tip of the screw shaft, thereby preventing the screw shaft from rotating freely.

Japanese Utility Model Publication No. 51-23521 (FIGS. 2 and 3)

  In the configuration using the above-described leaf spring, in addition to the leaf spring that prevents the rotation of the screw shaft, it is necessary to provide another member called a retaining collar, which requires time and labor for assembling.

  An object of the present invention is to provide a plowing depth adjusting mechanism for a rotary tiller that is easy to assemble and that can reliably prevent an unintended lifting movement of a grounding member.

  The first characteristic configuration of the tilling depth adjusting mechanism of the rotary tiller according to the present invention includes a screw shaft having a male screw portion on the outer peripheral surface, and a female screw portion screwed with the male screw portion of the screw shaft on the inner peripheral surface. A cylinder having a handle, a handle fixed to one end of the screw shaft or the cylinder, a support supporting the screw shaft or the cylinder fixed to the handle, and the screw shaft or the cylinder And a grounding member connected to the other side of the body, and a rotary depth adjustment mechanism for a rotary tiller that lifts and lowers the grounding member by rotating the handle and rotating the screw shaft or the cylinder. A flat portion is formed on the outer peripheral surface of the support, and the arm member is supported by the handle and is applied to the flat portion of the support so that the handle can be held. In the point.

[Action and effect]
According to this configuration, since the arm member supported by the handle portion is applied to the flat portion of the support body so as to hold the handle portion, it is assumed that vibration or impact during tillage work is applied to the handle portion. In addition, the position of the handle portion is maintained. As a result, the rotation of the screw shaft or the cylinder body to which the grounding member is connected is prevented, thereby preventing the grounding member from being moved up and down unintentionally.
Furthermore, according to this configuration, since an existing support is used as a member to which the arm member is applied, there is no need to provide another member in addition to the arm member that prevents the rotation of the screw shaft or the cylinder. Therefore, the number of parts is not increased, and assembly work is easy.

  The second characteristic configuration is that the handle portion includes a parallel shaft parallel to the screw shaft or the axis of the cylindrical body, and the arm member is supported around the parallel shaft so that the mounting angle can be changed. .

[Action and effect]
According to this configuration, since the arm member is supported around the screw shaft or the parallel axis parallel to the axis of the cylindrical body so that the mounting angle can be changed, the plane of the support body can be changed by changing the mounting angle of the arm member. The abutting force of the arm member to the portion can be adjusted. Thereby, the force which blocks | prevents rotation of a screw shaft or a cylinder, and the operation feeling when an operator rotates a handle | steering-wheel part can be adjusted freely.

  A third characteristic configuration is that the parallel axis is a grip portion gripped by an operator in the handle portion.

[Action and effect]
According to this configuration, since the parallel shaft is also used as the grip portion of the handle portion, the configuration is simplified and the cost can be reduced.

  According to a fourth feature configuration, the support has a polygonal column-shaped portion on an outer peripheral surface thereof, and the arm member has two planes constituting the corner at at least one corner of the polygonal column-shaped portion. It is in the point applied to the department.

[Action and effect]
According to this configuration, since the arm member is applied to the two flat surface portions constituting the corner portion of the support body, the handle portion will rotate when vibration or impact during tillage work is applied to the handle portion. In this case, the resistance that prevents the entire arm member from being separated from the support works, and the resistance that prevents the arm member from being pushed and spread in the portion of the arm member that contacts the corner of the support. . That is, since two resistance forces act on the rotation of the handle portion, the handle portion becomes more difficult to rotate more freely, and the unintentional lifting and lowering movement of the grounding member can be more reliably prevented.

It is the whole walk type work machine side view. It is a longitudinal cross-sectional view of a plowing depth adjustment mechanism. It is a top view of a working depth adjustment mechanism. It is the longitudinal cross-sectional view which expanded the principal part of the plowing depth adjustment mechanism. It is a cross-sectional view of the tilling depth adjusting mechanism showing the operation of the arm member. It is a cross-sectional view showing another embodiment of the plowing depth adjusting mechanism. It is a cross-sectional view showing another embodiment of the plowing depth adjusting mechanism.

Embodiment
Below, based on FIGS. 1-5, embodiment at the time of applying the working depth adjustment mechanism which concerns on this invention to the walk type work machine 1 is described.
(Walking work machine)
As shown in FIG. 1, the walking work machine 1 includes a mission case 2, an axle 3, wheels 4, a support frame 5, an engine 6, a transmission case 7, a steering handle 8, a rotary tiller device 9, and a tilling depth adjustment mechanism 12. It is configured with.

  An axle 3 is provided at the lower part of the transmission case 2 so as to extend to the right and left sides, and traveling wheels 4 are connected to both ends of the axle 3. The engine 6 is supported by a support frame 5 connected to the front part of the transmission case 2, and a transmission case 7 extends obliquely rearward and downward from the upper part of the transmission case 2. A steering handle 8 extends obliquely rearward and upward from the transmission case 7, and a rotary tiller 9 is connected to the rear portion of the transmission case 7. The bracket 10 fixed to the transmission case 7 extends rearward, the tilling depth adjusting mechanism 12 is provided at the rear end portion of the bracket 10, and the upper portion is positioned forward of the lower portion by the lock member 11. It is fixed.

(Plowing depth adjustment mechanism)
As shown in FIG. 2, the tilling depth adjusting mechanism 12 includes a rod-shaped screw shaft 13, a hollow regular quadrangular prism-shaped cylinder 16, a handle portion 18 fixed to the upper end of the screw shaft 13, and a screw shaft inside. 13 and a cylindrical support body 32 that can accommodate the cylindrical body 16 and a tail wheel 34 (an example of a grounding member) that comes into contact with the field during tillage work.

  As shown in FIG. 4, the screw shaft 13 includes a large-diameter portion 13a having a male screw portion on the outer peripheral surface and a small-diameter portion 13b having a smaller diameter than the male screw portion, and the small-diameter portion 13b is the upper end of the large-diameter portion 13a. Is provided.

  As shown in FIG. 4, a female screw member 17 having a female screw portion screwed into a male screw portion of the large-diameter portion 13 a of the screw shaft 13 is fitted and fixed to the upper end of the cylindrical body 16. As shown in FIG. 2, a tail wheel 34 is attached to the lower end of the cylindrical body 16 so as to be freely rotatable.

  By operating the handle portion 18 and rotating the screw shaft 13 around its axis, the female screw member 17 moves up and down along the screw shaft 13, thereby allowing the cylinder 16 to freely move inside the support 32. Can be moved up and down. At this time, since the female screw member 17 has a rectangular head and is housed in the cylindrical body 16 having a hollow space with a rectangular cross section, the female screw member 17 is prevented from rotating and does not rotate. .

  As shown in FIG. 5, the support body 32 has 1st-4th side surface S1-S4 as the plane part S, and as shown in FIG. 4, the ceiling board 33 is welded to the upper end.

  As shown in FIG. 4, an insertion hole H <b> 3 for inserting the small diameter portion 13 b of the screw shaft 13 is formed in the center portion of the ceiling plate 33 so as to penetrate in the vertical direction. The diameter of the insertion hole H3 is set smaller than the diameter of the large diameter portion 13a of the screw shaft 13.

  The small diameter portion 13b of the screw shaft 13 is inserted into the insertion hole H3 of the ceiling plate 33 from the inside of the support body 32 and protrudes to the outside, and is inserted into the first through hole H1 of the fixed portion 22a of the support member 22 described later. The handle portion 18 is fixed to the upper end of the screw shaft 13 by inserting the pin P so as to extend over the fixed portion 22 a of the support member 22 and the small diameter portion 13 b of the screw shaft 13.

  Further, since the lower surface of the fixed portion 22 a of the support member 22 contacts the upper surface of the ceiling plate 33 of the support body 32, the screw shaft 13 to which the handle portion 18 is fixed is rotatably supported by the support body 32. .

  As shown in FIG. 2, the handle portion 18 includes a rod-shaped gripping member 19 (grip portion) gripped by an operator, and a support member 22 that connects the gripping member 19 and the screw shaft 13.

  As shown in FIG. 2, the gripping member 19 is a parallel axis parallel to the axis of the screw shaft 13, and as shown in FIG. 4, the gripping member 19 includes a gripping portion 19 a that the operator grips, and a gripping portion. And a male screw small-diameter portion 19b having a smaller diameter than 19a and having a male screw formed on the outer periphery.

  The support member 22 includes a fixed portion 22a that is fixed to the small diameter portion 13b at the upper end of the screw shaft 13, a support portion 22b that supports the grip member 19, and a connecting portion 22c that connects the fixed portion 22a and the support portion 22b. And integrated. A first through hole H <b> 1 and a second through hole H <b> 2 are vertically formed in each of the fixed portion 22 a and the support portion 22 b of the support member 22.

  The diameter of the second through hole H2 of the support portion 22b is set to be approximately the same as the diameter of the male screw small diameter portion 19b of the grip member 19, and the male screw small diameter portion 19b of the grip member 19 is the same as the diameter of the support portion 22b. When the two through holes H2 are inserted, the gripping portion 19a of the gripping member 19 is held and held on the upper surface of the support portion 22b, and the lower end of the male screw small-diameter portion 19b extends from the second through hole H2 of the support portion 22b. Protruding state.

(Arm member)
As shown in FIGS. 3 to 5A, the arm member 28 is formed by bending an elastic member such as a spring wire, and is fixed to the male screw small-diameter portion 19 b of the gripping member 19 of the gripping member 19. The fixed portion 28a to be fixed, the abutting portion 28b arranged in a state of being applied to the outer surface of the support body 32, and the connecting portion 28c for connecting the abutting portion 28b and the fixed portion 28a are integrated. Prepare.

  The fixed portion 28a of the arm member 28 is formed by being bent into a ring shape, and the lower end of the male screw small diameter portion 19b of the gripping member 19 is inserted into the ring, and a nut N is further screwed from below. By fastening, the fixed portion 28a of the arm member 28 is supported by the handle portion 18 while being sandwiched between the lower end surface of the support portion 22b of the support member 22 and the nut N.

  Thus, the arm member 28 is supported around the gripping member 19 that is a parallel axis so that the mounting angle can be changed. For example, when the connecting portion 28c of the arm member 28 is attached obliquely from the gripping member 19 to the lower left side of the drawing surface from the state shown in FIG. 3, the abutting force of the arm member 28 against the support 32 increases. On the other hand, when the connecting portion 28c of the arm member 28 is attached obliquely from the gripping member 19 toward the upper left side of the drawing from the state shown in FIG. 3, the abutting force of the arm member 28 against the support 32 is weakened. In the present embodiment, when the nut N is tightened, the connecting portion 28c of the arm member 28 is directed from the gripping member 19 to the lower left side of the drawing, so that the abutting force is slightly strengthened.

  As shown in FIG. 5A, the abutting portion 28 b of the arm member 28 is bent into a U shape in accordance with the shape of the outer surface of the support 32. In the state shown in FIG. 5A, in the first corner portion A1 and the second corner portion A2 of the cross section of the support body 32, the first side surface S1 and the second side surface S2 constituting the first corner portion A1, and the first corner portion A1. It is applied to the second side surface S2 and the third side surface S3 constituting the corner portion A2. As shown in FIG. 4, in the present embodiment, the fixing position of the fixed portion 28a of the arm member 28 is set to a position higher than the applying position of the applying portion 28b of the arm member 28. The connecting portion 28c is bent in a crank shape.

  The abutting portion 28b of the arm member 28 is abutted against the first to third side surfaces S1 to S3 of the support body 32, whereby the position of the grip member 19 of the handle portion 18 is maintained. As a result, even if vibration or impact during the tilling work is applied to the handle portion 18, the handle portion 18 does not rotate freely, and the height of the tail wheel 34 changes to change the tillage depth. Can be prevented.

  Further, for example, when the grip portion 19a of the handle portion 18 is rotated 90 degrees from the posture of FIG. 5A to the posture of FIG. 5B, the abutting portion 28b of the arm member 28 grips the handle portion 18. The second side surface S2 and the third side surface S3 constituting the second corner portion A2 and the third side surface constituting the third corner portion A3 can be moved along the outer surface of the support body 32 with the rotation of the portion 19a. The position of the gripping member 19 of the handle portion 18 is held by being applied to S3 and the fourth side surface S4.

  That is, according to the above configuration, when the grip portion 19 a of the handle portion 18 is rotated around the axis of the screw shaft 13 and the screw shaft 13 is screwed to the cylinder body 16, the tail wheel 34 is moved together with the cylinder body 16. By moving up and down, the tillage depth can be adjusted arbitrarily. Even if vibration or impact is applied to the handle portion 18 during the plowing operation, the handle portion 18 is held by the arm member 28 and does not rotate freely, but the handle is used for the operator to adjust the plowing depth. When the portion 18 is rotated, the handle portion 18 can be rotated without any trouble without removing the arm member 28.

[Another embodiment]
[1] The shape of the support 32 in the above-described embodiment is not limited to the regular quadrangular prism shape having the first corner portion A1 to the fourth corner portion A4, and may be another polygonal prism shape. Furthermore, the entire shape may not be a polygonal column shape.For example, a polygonal process may be performed on a part of the outer peripheral surface of a round pipe or the like, or a polygonal member may be fixed to an end of the round pipe or the like. You may make it have a polygonal column-shaped part in the position where the abutting part 28b of the arm member 28 is arrange | positioned.

[2] As shown in FIG. 6, the abutting portion 28 b of the arm member 28 may be applied only at one corner A <b> 1 of the plurality of corners of the support 32. That is, the abutting portion of the arm member may be configured to be abutted against two plane portions constituting the corner portion in at least one corner portion of the polygonal column shape portion.

[3] As shown in FIG. 7, the shape of the support body 32 does not need to have a polygonal column shape portion, and has at least one flat surface portion S to which the abutting portion 28 b of the arm member 28 can be abutted. Anything is fine. In addition, the abutting portion 28b of the arm member 28 may not be configured to be abutted against two planar portions constituting the corner portion, and the abutting portion 28b of the arm member 28 is abutted against at least one planar portion. It is good also as a structure.

[4] The vertical positional relationship between the screw shaft 13 and the cylinder body 16 in the above-described embodiment is reversed, the handle portion 18 is fixed to the upper end of the cylinder body 16, and the tail wheel 34 is attached to the lower end of the screw shaft 13. It is good also as a structure. In this case, the gripping member 19 has a parallel axis parallel to the axis of the cylindrical body 16.

[5] In the above-described embodiment, the configuration in which the gripping member 19 of the handle portion 18 is a parallel axis parallel to the axis of the screw shaft 13 is disclosed, but the present invention is not limited to this configuration. A parallel axis parallel to the axis of the shaft 13 is provided separately (for example, the connecting portion 22c portion of the support member 22), and the arm member 28 is supported with respect to the parallel axis so that the mounting angle can be changed around the parallel axis. You may make it do. In addition, a configuration in which the handle portion 18 is fixed to the upper end of the cylindrical body 16 and the tail wheel 34 is attached to the lower end of the screw shaft 13 by reversing the vertical positional relationship between the screw shaft 13 and the cylindrical body 16 in the above-described embodiment. In this case, a parallel axis parallel to the axis of the cylindrical body 16 is separately provided, and the arm member 28 is supported with respect to the parallel axis so that the mounting angle can be changed around the parallel axis. You may do it.

[6] The arm member is not limited to one formed by bending a spring wire, but may be formed by bending different materials such as a strip, a round bar, a square bar, etc., and cut into a horizontal flat plate. It may be provided with notches and holes.

[7] The grounding member is not limited to the tail wheel 34 in the above-described embodiment, and a warp plate or the like may be used. In addition, the present invention is not limited to the configuration in which the grounding member such as the tail wheel 34 or the sled plate is directly attached to the cylindrical body 16 or the screw shaft 13. The present invention can also be applied to a configuration in which the member is connected to the cylindrical body 16 and the screw shaft 13 via another member.

  The present invention eliminates not only the walking type work machine having a traveling wheel and a rotary tiller separately but also abolishing the traveling wheel and connecting a tillage claw to the right and left axles to provide a rotary tiller. The present invention is also useful for the constructed walk-type work machine and the rotary tillage device installed in the riding type tractor.

9 Rotary tillage device 12 Plowing depth adjusting mechanism 13 Screw shaft 13a Large diameter part (male thread part)
16 Tube 17 Female thread member (Female thread part)
18 Handle part 19 Gripping member (grip part, parallel axis)
28 Arm member 32 Support body 34 Tail wheel (grounding member)
A Corner S S Plane

Claims (4)

A screw shaft having a male screw portion on the outer peripheral surface, a cylindrical body having a female screw portion screwed to the male screw portion of the screw shaft on the inner peripheral surface, and fixed to one upper end of the screw shaft or the cylindrical member A handle unit; a support body rotatably supporting the screw shaft or the cylinder body to which the handle unit is fixed; and a grounding member connected to the other of the screw shaft or the cylinder body. Then, by rotating the screw shaft or the cylinder, the plowing depth adjusting mechanism of the rotary tiller that raises and lowers the grounding member,
A flat surface portion is formed on the outer peripheral surface of the support, and the arm member is supported by the handle portion and applied to the flat surface portion of the support body, so that the handle portion can be held. Plowing depth adjustment mechanism of tillage equipment.   2. The rotary tiller according to claim 1, wherein the handle portion includes a parallel shaft parallel to the screw shaft or the axial center of the cylindrical body, and the arm member is supported around the parallel shaft so that the mounting angle can be changed. Plowing depth adjustment mechanism.   The tilling depth adjusting mechanism of the rotary tilling device according to claim 2, wherein the parallel shaft is a grip portion gripped by an operator in the handle portion.   The support has a polygonal column-shaped portion on an outer peripheral surface thereof, and the arm member is applied to two flat portions constituting the corner at at least one corner of the polygonal column-shaped portion. The tilling depth adjusting mechanism of the rotary tiller according to any one of claims 1 to 3.

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