JP2007043992A - Rotary tiller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary tiller stopping slip-off and preventing generation of loosening and rattling of an attachment frame in a support frame by inserting a lock pin into an adjustment pinhole of the attachment frame and press-fixing the attachment frame. <P>SOLUTION: The rotary tiller is constituted by bringing the support frame 26 provided above a tilling unit 15 into a hollow pipe, internally engaging the attachment frame 27 of a tool bar 29 to be freely slidable and inserting the lock pin supported at the support frame 26 to be reciprocally movable into either a plurality of adjustment holes bored in the attachment frame 27 to regulate the reciprocal movement of the tool bar 29 and pressing the attachment frame 27 to one side of the peripheral surface of the support frame 26 to inhibit loosening and rattling of the tool bar 29. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary tiller including a tool bar attached to a tractor.

Conventionally, a rotary tiller mounted on a tractor can slide a tool bar on which a tail wheel, a vertical stand, and the like are detachably mounted on a pair of left and right pipe-shaped support frames extending rearward from the body frame. In addition to the internal fitting, a tool bar portion is provided for adjusting the front and rear position of the tool bar by inserting the lock pin into one of a plurality of adjusting pin holes formed in the support pin and the tool mounting frame (for example, , See Patent Document 1).
The tool bar portion shown in Patent Document 1 inserts a lock pin biased in a locking direction by a spring into the lock pin hole of the support frame and the adjustment pin hole of the mounting frame, and adjusts the support position of the tool bar. The lock pin is pulled out of the adjustment pin hole against the spring force by the handle that is pivotally operated, so that the lock is released and the adjustment posture is released.
Japanese Utility Model Publication 3-99902

The tool bar portion disclosed in Patent Document 1 has an advantage that the front and rear position of the tool bar can be easily adjusted because the lock pin is inserted and removed by a handle operated by one touch. However, since the lock pin biased by the spring is simply inserted from the lock pin hole into the adjustment pin hole, it can prevent the mounting frame from moving back and forth (such as retaining), but the lock pin and the adjustment pin hole In addition, since there is a gap between the support frame and the mounting frame, there is a drawback that it is not possible to prevent rattling and chatter noise caused by airframe vibration.
In addition, in order to insert and remove the lock pin with a handle that performs a one-touch operation, there are problems such as requiring many parts such as a link member and a spring, and complicating the structure.

In order to solve the above-described problems, the rotary tiller of the present invention firstly adjusts the position of a tool bar 29 for mounting a tail wheel, a vertical stand or the like on the rear part of the support frame 26 provided above the tiller 15. In the rotary tiller 1 that is freely attached, the support frame 26 is formed as a hollow pipe, and the attachment frame 27 of the tool bar 29 is slidably fitted therein, and the lock pin is supported by the support frame 26 so as to be freely advanced and retracted. 33 is inserted into any one of the plurality of adjustment pin holes 35 formed in the mounting frame 27 to restrict the back-and-forth movement of the tool bar 29, and at the same time, the mounting frame 27 is placed on one side of the inner peripheral surface of the support frame 26. It is characterized in that it is configured so as to prevent rattling of the tool bar 29 by pressing toward.
Second, the lock pin 33 is formed by the large diameter portion 41 and the small diameter portion 42, and the small diameter portion 42 is inserted into any one of the plurality of adjustment pin holes 35 formed in the mounting frame 27, and The stepped portion 43 that continues from the small diameter portion 42 to the large diameter portion 41 is brought into contact with the mounting frame 27 and is configured to press the mounting frame 27 toward one side of the inner peripheral surface of the support frame 26. It is said.
Third, the lock pin 33 is fitted into the guide body 37 of the support frame 26, and the cam pin 39 of the lock pin 33 is inserted into the cam groove 36 formed in the guide body 37 so that the handle is provided on the lock pin 33. By rotating 40, the lock pin 33 is supported by the support frame 26 via a cam mechanism constituted by the cam groove 36 and the cam pin 39 so as to be freely advanced and retracted.

The rotary tiller according to the present invention has the following effects. That is, slide the mounting frame fitted inside the support frame to adjust the front / rear position of the tool bar, and insert the lock pin that is supported by the support frame so that it can move forward and backward. At the same time as restricting the movement, the mounting frame is pressed toward one side of the inner peripheral surface of the support frame, making it easy to adjust the front / rear position of the tool bar and preventing rattling from the tool bar. can do.
In addition, the support frame is provided with a lock pin formed with a large-diameter part and a small-diameter part so that it can be moved forwards and backwards. In this state, the stepped portion of the large-diameter portion presses the attachment frame toward one side of the inner peripheral surface of the support frame, so that rattling of the tool bar can be easily prevented.
In addition, since the cam pin of the lock pin moves along the cam groove formed in the guide body via the handle, the lock pin fitted in the guide body of the support frame can be moved forward and backward, so that the front / rear position adjustment mechanism of the tool bar The lock pin can be positioned and held with a one-touch operation.

  An embodiment of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a rotary tiller that is mounted so as to be movable up and down via an auto hitch 3 provided in a three-point link type lifting mechanism 3 a configured at the rear of the tractor 2. A tool bar 6 having a locking mechanism 5 is provided. The rotary tiller 1 includes a top mast 8 provided in a gear case 7 having an input shaft 7a connected to the PTO shaft of the tractor 2 with respect to the center upper portion of the auto hitch 3 and lower and right and left mounting portions, and the gear case. 7 is attached in a detachable manner by connecting the attachment portions of the horizontal frames 9, 9 extending to the left and right.

  The configuration of each part will be described in detail below. The body frame of the rotary tiller 1 is formed by integrally providing a transmission case 10 and a support frame 11 at the ends of cylindrical horizontal frames 9 and 9 extending on both sides of the gear case 7, respectively. 10 and the support frame 11 are supported by a tiller shaft 13 to which a plurality of tillage claws 12 are attached in a later-described configuration, and the tiller portion 15 is rotationally driven.

The rotational drive of the tilling part 15 is to rotate the tilling shaft 13 from the lateral transmission shaft 16 pivotally supported in the left lateral frame 9 via the chain transmission mechanism 16a in the transmission case 10 with the rotational power of the input shaft 7a. Is done by.
The upper and side portions of the tillage portion 15 are covered by a tillage cover 17 that is attached and fixed to the body frame side, and the rear side is covered by a rear cover 18 that is rotatably connected to the tillage cover 17.

As shown in FIGS. 4 and 5, the tilling claw 12 is inserted into a claw holder 19 projecting from the outer peripheral surface of the tilling shaft 13, and a claw comprising a bolt or a stop pin inserted from the side of the claw holder 19. The fixing tool 20 is attached and fixed. As shown in FIG. 5, the claw holder 19 has an outer peripheral surface formed in a boat-like shape that is streamlined in the rotational direction, and has a rectangular cross-section mounting hole 21 into which the tilling claw 12 is inserted. .
As a result, the nail holder 19 can be formed into a tapered gathering portion 22 in which the smooth curved side surface is converged, so that the soil can be smoothly cultivated while preventing soil adhesion with low contact resistance with the cultivated soil. be able to.

The claw holder 19 having the above-mentioned shape can be easily manufactured by means such as die forging or lost wax casting, and the base side of a number of claw holders 19 is welded to the tilling shaft 13.
In this case, welding with the arc rod held by the hand of the welding robot can be performed continuously in one step so as to draw an ellipse along the base of the nail holder 19. Thus, it can carry out efficiently, without increasing the welding process from a welding start point to an end point.

  Next, the toolbar unit 6 will be described with reference to FIGS. 1, 2 and 6 to 9. The tool bar portion 6 is slidable in support frames 26 and 26, which are formed by pipe rods pivotally supported on brackets protruding from the horizontal frames 9 and 9 via a mounting shaft 25, and the support frames 26 and 26. A tool bar 29 having mounting frames 27, 27 inserted into the support frame 26, a horizontal flange 30 connecting the rear portions of the support frames 26, 26, and a screw-type tool bar lifting tool 31 supported by the top mast 8. Thus, when the tool bar 31 is extended and contracted, the vertical height of the tool bar 29 on which the tail wheel or the vertical machine is mounted is adjusted via the support frames 26 and 26 and the mounting frames 27 and 27 with the mounting shaft 25 as a fulcrum. be able to.

  The tool bar 6 is provided with the lock mechanism 5 corresponding to the lock pin hole 32 formed in the upper surface of the rear part of the support frames 26 and 26. Further, a plurality of adjustment pin holes 35 into which lock pins 33 (described later) are detachably inserted are formed on the upper surfaces in the axial direction of the mounting frames 27, 27 at a predetermined interval. In this embodiment, each adjustment pin hole 35 has a smaller diameter than the lock pin hole 32.

  As shown in FIG. 7, the lock mechanism 5 includes a guide body 37 in which a cam groove 36 is formed in a slanted shape with a length of about a half circumference on one side of the middle portion of the cylindrical body, and a lock pin hole 32 of the support frame 26. It is fixed on the outer peripheral surface. The guide body 37 is inserted into the pin hole 33a drilled in the lock pin 33 from the cam groove 36 side, and is press-fitted and fixed in a state where the lock pin 33 is inserted into the lock pin 33 so as to be able to advance and retreat. A cam mechanism that loosely supports the pin 33 via the cam groove 36 and the cam pin 39 is provided.

  The lock pin 33 is provided with an L-shaped handle 40 in an upper portion in a side view, and is fitted in a large diameter portion 41 fitted into the lock pin hole 32 and an adjustment pin hole 35 of the mounting frame 27 at a lower portion. The small diameter portion 42 is formed concentrically. As a result, the stepped portion 43 at the lower end formed in the step shape of the large diameter portion 41 can be a pressing portion that contacts the surface of the mounting frame 27 around the adjustment pin hole 35.

  Further, the cam groove 36 formed in an inclined manner in the circumferential direction of the guide body 37 has a groove width that allows the cam pin 39 to move smoothly without rattling, and the stroke formed by the vertical distance (height) at both ends of the groove, It is possible to switch between a locked posture in which the small diameter portion 42 is inserted into the adjustment pin hole 35 and an adjustment posture in which the small diameter portion 42 is detached from the adjustment pin hole 35.

  The cam surface of the cam groove 36 has an angle between an upper cam surface (non-locking cam surface) 50 and a lower cam surface (locking cam surface) 51 located at both ends from an inclined cam surface 52 in the middle. Also, the guide body 37 can reliably perform positioning and holding in the locked posture and the adjusted posture when the lock pin 33 advances and retreats.

  As shown in FIG. 8, the tool bar portion 6 of the rotary tiller 1 configured as described above has a handle from the adjustment posture in which the cam pin 39 of the lock mechanism 5 is supported by the non-lock side cam surface 50 of the cam groove 36. When 40 is rotated backward and the cam pin 39 reaches the lock side cam surface 51, the small diameter portion 42 is inserted into the selected adjustment pin hole 35 of the mounting frame 27 and the large diameter portion 41 as shown in FIG. Is inserted into the lock pin hole 32.

  Then, the handle 40 is further rotated, and the cam pin 39 is pushed into the lock-side cam surface 51 from the inclined cam surface 52, whereby the cam pin 39 exerts a friction force in the non-return direction by the gentle lock-side cam surface 51. Thus, the surface of the mounting frame 27 can be strongly pressed by the stepped portion 43, and the positioning and holding of the lock pin 33 can be ensured by the lock side cam surface 51.

  Accordingly, in the lock mechanism 5, the small diameter portion 42 inserted into the adjustment pin hole 35 in the support frame 26 restricts the back-and-forth movement of the mounting frame 27, and at the same time, the stepped portion 43 holds the mounting frame 27 inside the support frame 26. The lock pin 33 and the mounting frame 27 are integrated with the support frame 26 without pressing up and down against one side of the peripheral surface, and chatter noise due to vibration can be prevented. it can.

  When changing the support position (front-rear adjustment position) of the tool bar 29, when the handle 40 is rotated from the rear to the front, the cam pin 39 moves from the lock-side cam surface 51 through the inclined cam surface 52 to the non-lock side. As shown in FIG. 8, the lock pin 33 rises and the cam pin 39 is supported by the non-lock side cam surface 50, and the insertion posture and the pressing of the small diameter portion 42 and the stepped portion 43 are released as shown in FIG. can do.

When the tool bar 29 is pulled out (or pushed in) in this state, the attachment frames 27 and 27 can slide in the support frames 26 and 26 to reach a predetermined tool bar set position.
Next, when the handle 40 is rotated backward and reversed at the setting position of the tool bar 29, the lock pin 33 can be lowered to be locked again.

  In the illustrated locking mechanism 5, the large-diameter portion 41 and the small-diameter portion 42 are formed on the lock pin 33 and the mounting frame 27 is pressed by the stepped portion 43, but the lock pin 33 is not limited to this. Can be a straight lock pin 33 indicated by a dotted line in FIG. That is, when the straight lock pin 33 is formed without forming the large diameter portion 41 and the small diameter portion 42, the lock pin 33 is inserted into the lock pin hole 32 and the adjustment pin hole 35 having the same diameter. Can do. Then, by using the shaft end of the lock pin 33 as a pressing portion and pressing the pressing portion against the inner peripheral surface of the mounting frame 27, the tool bar 29 can be simply touched in the same manner as in the above embodiment. It can be locked by operation.

It is a side view which shows the state which mounted | wore the tractor with the rotary tillage apparatus provided with the toolbar part concerning this invention. It is a perspective view which shows the structure of the rotary tiller of FIG. It is sectional drawing which shows the structure of the rotary tilling apparatus of FIG. It is a side view of the cultivation part of a rotary cultivation apparatus. It is a partial plane sectional view which shows the structure of the principal part of the tilling part of FIG. It is a left view of a toolbar part. It is a sectional side view which shows the structure of the locking mechanism of the toolbar part of FIG. 6, and the state of a lock attitude | position. It is a sectional side view which shows the state of the adjustment attitude | position of a cam mechanism. It is a back sectional view showing the state from the adjustment posture of the cam mechanism to the lock posture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary tiller 2 Tractor 5 Lock mechanism 6 Tool bar part 7 Handle 26 Support frame 27 Mounting frame 29 Tool bar 32 Lock pin hole 33 Lock pin 35 Adjustment pin hole 36 Cam groove 37 Guide body 39 Cam pin 41 Large diameter part 42 Small diameter part 43 Step Attached part (pressing part)
50 Non-locking cam surface 51 Locking cam surface 52 Inclined cam surface

Claims (3)

  In the rotary tiller (1) in which a tool bar (29) for mounting a tail wheel, a vertical machine, etc. is attached to the rear part of the support frame (26) provided above the tillage part (15) so that the front and rear positions can be adjusted. The support frame (26) is formed as a hollow pipe, and the mounting frame (27) of the tool bar (29) is slidably fitted therein, and the lock pin (33) is supported by the support frame (26) so as to be able to advance and retreat. Is inserted into any of the plurality of adjustment pin holes (35) drilled in the mounting frame (27) to restrict the back-and-forth movement of the tool bar (29), and at the same time, the mounting frame (27) is supported on the support frame ( 26) A rotary tiller configured to be pressed toward one side of the inner peripheral surface of 26) to prevent rattling of the toolbar (29).   The lock pin (33) is formed by a large-diameter portion (41) and a small-diameter portion (42), and any of a plurality of adjustment pin holes (35) in which the small-diameter portion (42) is formed in the mounting frame (27). The stepped portion (43) connected from the small diameter portion (42) to the large diameter portion (41) is brought into contact with the mounting frame (27), and the mounting frame (27) is supported by the support frame (26 The rotary tiller according to claim 1, wherein the rotary tiller is configured to be pressed toward one side of the inner peripheral surface. The lock pin (33) is fitted into the guide body (37) of the support frame (26), and the cam pin (39) of the lock pin (33) is passed through the cam groove (36) formed in the guide body (37). By inserting and rotating the handle (40) provided on the lock pin (33), the lock pin (33) is supported through the cam mechanism (36) and the cam pin (39). 26. The rotary tiller according to claim 1 or 2, wherein the rotary tiller is supported so as to be able to advance and retract.

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