JP2016222053A - Walking type cultivator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walking type cultivator capable of reliably stopping motion of traveling wheels even in a slope or inclined field.SOLUTION: A walking type cultivator comprises: traveling wheels; cultivating claws for cultivating a field; an engine for rotating the traveling wheels and the cultivating claws; a transmission case for transmitting a driving force from the engine to the traveling wheels and the cultivating claws; a main clutch on/off device; a drive shaft for a traveling system, the one end part of which protrudes outside from the transmission case and at the one end part of which a groove part is provided; and a parking brake on/off device having a parking brake pin insertable into the groove part for performing switching whether to inhibit the rotation of the drive shaft or not. By switching the parking brake on/off device to the side for inhibiting the rotation of the drive shaft, the parking brake pin is inserted into the groove part to lock motion of the drive shaft. The walking type cultivator is also provided with a guide member for guiding the parking brake pin.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a walking type tiller.

  2. Description of the Related Art Conventionally, walking type tillers that plow a field are known (see, for example, Patent Document 1).

  This conventional walking type tiller is provided with a brake device that provides resistance to the rotation of the traveling wheel.

JP 2011-182758 A

  However, according to the configuration of the conventional walking type tiller, the parking brake is operated by applying resistance to the rotation of the traveling wheel. However, since the brake device is a drum type brake configuration, It was the structure which provides resistance to rotation of a running wheel by friction. For this reason, there existed a subject that the movement of a running wheel could not be locked reliably on a slope or an inclined field.

  The present invention has been made in view of the above-described problems of the conventional walking type tiller, and it is an object of the present invention to provide a walking type tiller that can reliably lock the movement of a traveling wheel even on a slope or an inclined farm field. And

In order to solve the above-mentioned problem, in claim 1, the traveling wheels (4L, 4R), the tilling claws (6) for tilling the field, the traveling wheels (4L, 4R) and the tilling claws (6) An engine (15) to be rotated, a transmission case (2) having a built-in transmission mechanism for transmitting a driving force from the engine (15) to the traveling wheels (4L, 4R) and the tilling claw (6); A main clutch on / off device (18) for switching whether or not to transmit the driving force from the engine (15), and one end projecting outward from the transmission mechanism of the transmission case (2) A travel system drive shaft (40) provided with a groove (41a) at one end thereof, and a parking brake pin (301) that can be inserted into the groove (41a) of the travel system drive shaft (40). Possess In the walking type field cultivator provided with the parking brake on / off device (311) for switching whether to prevent the rotation of the drive shaft (40),
By switching the parking brake on / off device (311) to the side that prevents the drive shaft (40) from rotating, the parking brake pin (301) is inserted into the groove (41a) to drive the traveling system. The movement of the shaft (40) is locked,
A walk-type field cultivator having a guide member for guiding and guiding the parking brake pin (301) is provided.

  In Claim 2, it is set as the walk-type tiller of Claim 1 provided with two or more guide members which guide and guide the said parking brake pin (301).

  According to a third aspect of the present invention, in the walking type tiller according to the first or second aspect, the guide member is configured up to the vicinity of the drive shaft of the traveling system.

  Thereby, the drive shaft (40) of the traveling system can be reliably locked without slipping, and the parking brake can be operated reliably.

  In the first to third aspects of the invention, the movement of the traveling wheel can be reliably locked even on a slope or an inclined field, and the parking brake can be operated reliably.

Overall side view of the field cultivator Top view of the operating handle part of the field cultivator Left side view of the control handle of the field cultivator Schematic right side view of the cultivator mission case Left side view of the cultivator with the belt cover removed Cross section of the field case Cross section of the field case Right side view of the field case Top view of the field case Perspective view of the tillage parking brake mechanism (A) Top view of parking brake mechanism, (b) Right side view of parking brake mechanism shown in FIG. (A) Top view of parking brake mechanism, (b) Right side view of parking brake mechanism shown in FIG. Right side view of parking brake mechanism Plan view of parking brake mechanism

  Hereinafter, the configuration and operation of a field cultivator according to an embodiment of the present invention will be described with reference to the drawings.

  1 is an overall left side view of the field cultivator according to the first embodiment, FIG. 2 is a plan view of an operation handle part of the field cultivator according to the first embodiment, and FIG. 3 is an operation handle part. FIG. FIG. 4 is a schematic right side view of the mission case.

  First, the configuration of the cultivator 100 according to the present embodiment will be mainly described with reference to these drawings.

  As shown in FIG. 1, the body 1 of the cultivator 100 includes a mission case 2 formed in a substantially square shape in a side view and a support frame 3 provided on the front side of the mission case 2. Among these, the axle 4 is projected from the lower part of the front case 2a of the transmission case 2 to support the left and right traveling wheels 4L, 4R, and the tilling shaft 5 is projected from the lower part of the rear case 2b to cultivate the claws 6, 6,. The tilling device 7 is provided.

  The top surface of the tillage device 7 is configured to be covered with a rotary cover 8, and the rear surface is configured to be covered with a rear cover 9. A resistance rod holder 10 is provided on the rear end side of the rotary cover 8, and the resistance rod 11 is connected and held so that its height can be adjusted. A tail wheel holder 12a is integrally connected to the resistance rod holder 10, and a tail wheel 13 is provided so that the vertical height can be adjusted.

  The support frame 3 is provided with an engine 15 and transmits the engine output to the transmission mechanism in the transmission case 2 via a belt transmission mechanism 200 (see FIG. 5). A belt cover 16 covers the belt transmission mechanism. A fuel tank 19 is provided above the engine 15.

  At the upper part of the mission case 2, a base portion of an operation handle 17 is mounted, and the operation handle 17 is provided obliquely upward and rearward and is formed in a loop shape in plan view (see FIG. 2). Reference numeral 18 denotes a main clutch lever which can be interlocked with the on / off operation of the main clutch 210 (see FIG. 5) in the belt transmission mechanism 200 by rotating up and down around the first horizontal shaft 18a (see arrow α in FIG. 1). When the operator pushes down the main clutch lever 18 so as to overlap with the gripping portion 17a of the operation handle 17, the main clutch 210 is "on", and when released, the main urging force of the spring (not shown) is applied by the return biasing force. The clutch 210 is “disengaged”.

  In the present embodiment, the driving force from the engine 15 is transmitted to both the axle 4 and the tilling shaft 5 with the main clutch 210 “on”, and the axle 4 and the tilling shaft 5 with the main clutch 210 “off”. The configuration is not transmitted to both.

  Furthermore, the right side surface of the transmission case 2 of the cultivator 100 according to the present embodiment is configured to be interlocked with the operation of the main clutch lever 18 for turning on and off the main clutch 210 (see FIG. 5). A parking brake mechanism 300 that can securely lock the drive shaft is provided. This will be further described later.

  Further, in the cultivator 100 of the present embodiment, the rotary clutch 400 (see FIG. 7) is moved to the right side of the gripping portion 17a of the operation handle 17 by rotating up and down around the second horizontal axis 20a (see arrow β in FIG. 1). And a differential / diff lock clutch lever 20 that can be linked to both on / off operations of the differential lock clutch 500 (see FIG. 6). Here, in the state where the main clutch 210 is “on”, the driving force from the engine 15 is basically transmitted to the tilling shaft 5 by the rotary clutch 400 “on” and is driven by the rotary clutch 400 “off”. This is a configuration that is not transmitted to the shaft 5. Further, when the differential lock clutch 500 is “on”, the differential lock is activated for the left and right traveling wheels 4L and 4R (ie, the differential function is stopped), and when the differential lock clutch 500 is “off”, the differential lock is released (ie, the differential is released). The function is activated). This will be further described later.

  Here, the differential function refers to a function that causes a difference in rotational speed between the inner wheel and the outer wheel when the tiller 100 is turned, for example, in a U-turn. . When the differential function is activated, the cultivator 100 turns smoothly.

  The main clutch lever 18 of the present embodiment is an example of the main clutch on / off device of the present invention.

  Here, the main clutch 210 and the belt transmission mechanism 200 described above will be further described with reference to FIG.

  FIG. 5 is a schematic left side view for explaining the belt transmission mechanism 200 and the main clutch 210, which is a main part of the cultivator 100 with the belt cover 16 removed. In addition, a part of the outer shape of the engine is omitted.

  As shown in FIG. 5, the belt transmission mechanism 200 includes a first sprocket 201 a fixed to the engine output shaft 201, a second sprocket 202 a fixed to the mission input shaft 202, and a transmission laid loosely between them. The main clutch 210 for transmitting or not transmitting the output from the engine 15 to the transmission mechanism in the transmission case 2 by adjusting the tension of the belt 203 and the transmission belt 203 that is loosely mounted. It is equipped with.

  In addition, as shown in FIG. 5, the main clutch 210 is disposed such that a tension roller 211 that is rotatable at the tip thereof can be brought into contact with the transmission belt 203, the other end is rotatably supported, and the rotation shaft A tension arm 213 provided with a spring member 212 that constantly applies a turning force that rotates the tension roller 211 in a direction to separate the tension roller 211 from the transmission belt 203, and a front end 221 of the main clutch cable 220 connected to the main clutch lever 18 side. The tension spring 214 is connected to the center of the tension arm 213.

  With the above configuration, when the operator pushes down the main clutch lever 18 so as to overlap with the gripping portion 17a of the operation handle 17 (see FIG. 1), the main clutch 210 is turned “ON”, as shown in FIG. The cable 220 is pulled in the direction of arrow A, the tension arm 213 rotates clockwise (see arrow C in FIG. 5), and the tension roller 211 pushes up the transmission belt 203, so that the transmission belt 203 is The sprocket 201a and the second sprocket 202a are in close contact with each other. Thereby, the rotational power from the engine output shaft 201 is transmitted to the mission input shaft 202. At this time, the tension spring 214 is extended, and a force acts on the torque spring 212 on the side on which the torque acts.

  In addition, with the above configuration, when the operator releases his hand from the state where the main clutch lever 18 is pushed down so as to overlap the grip portion 17a of the operation handle 17 (see FIG. 1), the torque of the torque spring 212 is increased. When the tension spring 214 is released and the main spring 210 is contracted, the main clutch 210 is “disengaged”. As shown in FIG. 5, the main clutch cable 220 is pulled in the direction of arrow B, and the tension arm 213 rotates counterclockwise. (See arrow D in FIG. 5) When the tension roller 211 is separated from the transmission belt 203, the transmission belt 203 becomes loose between the first sprocket 201a and the second sprocket 202a. Thereby, the rotational power from the engine output shaft 201 is not transmitted to the mission input shaft 202.

  Next, the differential lock clutch 500 and the rotary clutch 400 provided in the mission case 2 will be described with reference to FIGS.

  FIG. 6 is a schematic cross-sectional view of the mission case 2 for explaining the differential lock clutch 500, and FIG. 7 is a schematic cross-sectional view of the mission case 2 for explaining the rotary clutch 400.

  As shown in FIG. 6, in the mission case 2, an input shaft 21 having a mission input shaft 202 fixed at one end, and a traveling first shaft to which a driving force from the input shaft 21 is transmitted via a predetermined gear mechanism. 30, a traveling second shaft 40 in which the driving force from the traveling first shaft 30 is transmitted to the traveling system through a predetermined gear mechanism, and a driving force from the traveling second shaft 40 through the predetermined gear mechanism. A traveling third shaft 50 that is transmitted to the traveling system is disposed. Further, in the transmission case 2, a differential mechanism 60 provided in the center with respect to the left-right direction of the axle 4 of the traveling wheel, and a differential lock provided in the vicinity of the differential mechanism 60 to turn on and off the differential function of the differential mechanism 60. A clutch 500 is disposed, and a traveling chain belt 51 that transmits driving force is laid between the traveling third shaft 50 and the differential mechanism 60.

  Note that one end portion 41 of the traveling second shaft 40 protrudes outward from the right side surface of the transmission case 2, and a parking brake groove 41a is formed at the tip thereof. This will be further described later.

  Here, the traveling second shaft 40 of the present embodiment is an example of a driving shaft of the traveling system of the present invention, and the parking brake groove 41a of the present embodiment is an example of a recess of the driving shaft of the traveling system of the present invention. It hits.

  As shown in FIG. 6, the diff lock clutch 500 is provided with a diff lock clutch main body 510 that is provided so that the second pawl 511 can be fitted to the first pawl 61 provided on the differential mechanism 60 side and is splined to the axle 4. A spring member 512 that is arranged between the differential mechanism 60 and the differential lock clutch main body 510 and constantly urges the differential lock clutch main body 510 in a direction away from the differential mechanism 60; The rotary shaft 514 is supported so as to be rotatable about a rotation shaft 514, and one end portion is connected to the differential lock clutch main body 510, and the other end portion is a differential lock arm shaft 540 described later (see FIGS. 4 and 13B). The differential lock clutch arm connected to the differential lock connecting member 513 It is constructed from 520.

  In FIG. 6, the second pawl 511 of the differential lock clutch main body 510 is separated from the first pawl 61 of the differential mechanism 60, and the differential lock clutch 500 is in the “off” state, that is, the differential function is activated. Show.

  Further, as shown in FIG. 7, in the transmission case 2, a tilling first shaft 45 in which driving force from the traveling first shaft 30 is transmitted to the tilling system via a predetermined gear mechanism, and a tilling first shaft 45. A tilling second shaft 55 is arranged in which the driving force from the power is transmitted to the tilling system via a predetermined gear mechanism. Further, in the transmission case 2, a tilling first sprocket 56 that is loosely connected to a substantially central portion with respect to the left and right direction of the tilling second shaft 55, and a tilling first sprocket 56 from the tilling second shaft 55 to the tilling first sprocket 56. And a rotary clutch 400 for turning on and off the transmission of the driving force.

  Further, as shown in FIG. 7, the rotary clutch 400 is spline-connected to the second tillage shaft 55 and arranged so as to be able to be engaged with the first tiller sprocket 56a provided on the first tilling sprocket 56. The rotary clutch main body 410 which has 410a, and the rotary clutch shifter 420 which shifts the rotary clutch main body 410 along the axial direction of the tilling 2nd axis | shaft 55 are comprised. One end portion 421a of the shifter shaft 421 constituting the rotary clutch shifter 420 protrudes outward from the transmission case 2 and is connected to a rotary clutch arm 440 (see FIG. 13A) described later.

  When the shifter shaft 421 slides in the direction of the arrow K, the tillage first sprocket claw 56a and the rotary clutch claw 410a are engaged with each other, the rotary clutch 400 is in the “on” state, and the shifter shaft 421 is moved in the direction of the arrow J. By sliding, the first sprocket pawl 56a and the rotary clutch pawl 410a are separated from each other, and the rotary clutch 400 is in the “disengaged” state.

  Further, as shown in FIG. 7, the tiller shaft 5 is driven between the tiller first sprocket 56 disposed on the tiller second shaft 55 and the tiller second sprocket (not shown) disposed on the tiller shaft 5. A cultivating chain 57 for transmitting power is laid.

  Next, it demonstrates still more concretely centering around the structure of the parking brake mechanism 300 using FIGS. 8-10.

  8 is a partially enlarged right side view of the mission case 2 provided with the parking brake mechanism 300, FIG. 9 is a partially enlarged schematic plan view of the mission case 2 provided with the parking brake mechanism 300, and FIG. It is a disassembled schematic perspective view of a unit. Note that FIG. 9 shows a main part necessary for explaining the parking brake mechanism 300, and other configurations (for example, a rotary clutch arm support part 335 and a return spring hook part 336 described later) are illustrated. Omitted.

  As shown in FIGS. 8 and 10, one end portion 41 of the traveling second shaft 40 protrudes outward from the right side surface of the mission case 2 through a hole 330 a provided in a bracket 330 described later, and an outer peripheral surface at the tip thereof. The two parking brake grooves 41a are formed at axially symmetrical positions.

  In addition, a parking brake lever unit 310 having a parking brake pin 301 in which a tip portion 301a that enters the parking brake groove 41a is formed in a spherical surface is fixed to the right side surface of the transmission case 2 with a bolt 310a. The parking brake pin 301 is rotatably attached to the parking brake lever unit 310 by an attachment pin 302.

  The parking brake lever unit 310 is curved in a substantially U shape in a plan view, and is a rectangular plate-like member extending in a direction protruding from the transmission case 2 from one side thereof. The parking brake lever 311 that rotates counterclockwise, the through hole 312 into which the bolt 310a is inserted, and one end of the fulcrum spring 320 are hung on the rear part of the through hole 312 (the rotation fulcrum of the parking brake lever 311). And a parking brake lever 311 which crosses both sides curved in a substantially U shape in plan view and is fixed to the rear upper side of the through hole 312 and parallel to the rotation axis of the bolt 310a. Stopper pin that acts as a stopper by hitting a part of a bracket 330, which will be described later, when rotated in the releasing direction. 14, and a connecting hole 315 for connecting the front end portion 230a of the brake cable 230 for connecting the main clutch lever 18 side.

  Further, on the right side surface of the transmission case 2, a spring front pin 331 curved in a substantially L shape for hooking the other end of the fulcrum spring 320 is provided in front of the through hole 312 (the rotation fulcrum of the parking brake lever 311). The brackets 330 are fixedly welded so as to be positioned at the same position, and brackets 330 having an L-shaped plate 332 having a hole 332a for slidingly supporting the parking brake pin 301 so as to be slidable are provided on the surface. The fixing holes 333a to 333d are used for fixing with bolts. The bolt 310a that rotatably supports the parking brake lever unit 310 also serves as a bolt that fixes the bracket 330 to the transmission case 2 using the bolt fixing hole 333a.

  Thereby, the number of parts can be reduced.

  In addition, since the L-shaped plate 332 is formed in a substantially L-shape when viewed from the side, even if the driving force of the traveling second shaft 40 is applied to the parking brake pin 301, the strength is higher than that of a simple flat plate. Is strong and difficult to deform.

  Further, since the spring front pin 331 curved in a substantially L shape is welded and fixed to the bracket 330 together with the L shape plate 332, in addition to the L shape plate 332 having excellent strength, the L shape spring front pin By using 331 as a strength increasing member, it is possible to prevent deformation when the driving force of the traveling second shaft 40 is applied to the parking brake pin 301.

  In addition, the fulcrum passing spring 320 having one end hooked on the post-spring pin 313 and the other end hooked on the pre-spring pin 331 is arranged in a substantially horizontal direction with respect to the body 1.

  This also improves the efficiency because the tension of the fulcrum spring 320 acts in the direction of pressing the parking brake pin 301 against the traveling second shaft 40 when the parking brake lever 311 is on the “on” side.

  This also ensures a clearance with the tire at the minimum tread. That is, when the parking brake is released, the post-spring pin 313 is lowered downward as shown in FIG. Since the outer periphery of the tire of the right traveling wheel 4R comes below the rear spring pin 313, by arranging the rear spring pin 313 as horizontally as possible, a clearance with the tire can be secured, and the rear spring pin 313 is connected to the tire. Contact can be prevented. Normally, the left and right positions of the cultivator tire can be easily changed with respect to the axle 4 (this is referred to as tread change). In the cultivator configuration according to the present embodiment, the tire is located below the pin 313 after the spring. When it comes to, it is when the tread is minimum.

  Further, the rear portion of the bracket 330 is separated into upper and lower parts, and the lower end 334a of the stopper pin 314 on the side close to the transmission case 2 hits the upper end edge 334 of the lower rear portion. When the lever 311 is rotated in the releasing direction, it functions as a stopper.

  Thereby, since a part of the bracket 330 also serves as a stopper, an independent new part is unnecessary, and the configuration is simplified.

  The other end portion 220b of the main clutch cable 220 and the other end portion 230b of the brake cable 230 are combined into one main clutch / brake cable 240 and coupled to the main clutch lever 18 as shown in FIG. (See FIGS. 2 and 3).

  Further, the distal end portion 230 a side of the brake cable 230 is held by one stay 250 that is a member for fixing the operation handle 17. The stay 250 has a rotary clutch cable 430 disposed outside the differential lock clutch cable 530 in a plan view of a distal end portion 430a side of the rotary clutch cable 430 and a distal end portion 530a side of the differential lock clutch cable 530, which will be described later. It is the structure to hold | maintain (refer Fig.13 (a)).

  As a result, the one stay 250 is configured to hold the tip end portion 230a side of the brake cable 230, the tip end portion 430a side of the rotary clutch cable 430, and the tip end portion 530a side of the differential lock clutch cable 530. And the configuration can be simplified.

  In addition, when the rotary clutch cable 430 is disposed outside the differential lock clutch cable 530 in plan view, the amount of protrusion of the member in the lateral direction of the machine body can be reduced.

  Moreover, according to the said structure, when using only as a parking brake, it can comprise in a space-saving rather than an internal expansion type brake.

  As described above, the one end portion 41 of the traveling second shaft 40 protruding outward from the right side surface of the mission case 2, the parking brake groove 41 a formed in an axially symmetric position on the outer peripheral surface of the tip end, the parking brake lever unit 310, The bracket 330 and the like constitute the parking brake mechanism 300.

  In addition, while covering the mechanism part such as the shift shifter, the rotating part such as the one end part 41 of the traveling second shaft 40 protruding outward from the right side surface of the transmission case 2 is protected, and the safety of the design is taken into consideration. A cover 390 of a resin molded product to be improved is fixed to the mission case 2 with screws 391a and 391b.

  Next, the operations of the main clutch lever 18, the main clutch 210, and the parking brake mechanism 300 will be mainly described with reference to FIGS.

  FIG. 11A is a schematic plan view of the parking brake mechanism 300 for explaining a state in which the parking brake lever 311 is operated to the “on” side in a state where the operator has released his hand from the main clutch lever 18. FIG. 11B is a parking brake mechanism for explaining a state in which the parking brake lever 311 is operated to the “on” side in a state where the operator has released his hand from the main clutch lever 18. 3 is a schematic right side view of 300. FIG.

  FIG. 12A shows a parking brake for explaining a state in which the parking brake lever 311 is forcibly moved to the “off (release)” side when the operator depresses the main clutch lever 18. FIG. 11B is a schematic plan view of the mechanism 300. FIG. 11B shows a state in which the parking brake lever 311 is forcibly moved to the “off (release)” side when the operator depresses the main clutch lever 18. It is a schematic right view of the parking brake mechanism 300 for demonstrating.

  First, when the operator releases his hand from the main clutch lever 18, the operation is as follows.

  At this time, the lower end surface 314a of the stopper pin 314 is in contact with the rear upper end edge 334 of the bracket 330 in a state where the fulcrum passing spring 320 is over the fulcrum, and the parking brake lever 311 is turned off (released). ) "Side.

  When the operator releases his hand from the main clutch lever 18, the main clutch lever 18 rises and the main clutch / brake cable 240 tends to loosen due to the return biasing force of the tension spring 214 and the torque spring 212 shown in FIG. However, when the main clutch cable 220 is pulled in the direction of arrow B (see FIG. 5) by the restoring force of the torque spring 212 (see FIG. 5) of the spring member provided on the tension arm 213, the main clutch cable 220 is connected. The main clutch / brake cable 240 is pulled in the direction of arrow E (see FIGS. 3 and 11A).

  When the main clutch cable 220 is pulled in the direction of arrow B (see FIG. 5), the tension roller 211 rotates in the direction of pulling away from the transmission belt 203 (see arrow D in FIG. 5). State. Thereby, the output from the engine 15 is not transmitted to the transmission mechanism in the mission case 2, and the rotation of the axle 4 and the tillage shaft 5 is stopped.

  On the other hand, when the main clutch / brake cable 240 is pulled in the direction of arrow E (see FIG. 11 (a)), the brake cable 230 connected to the main clutch / brake cable 240 is also in the direction of arrow E (FIG. 11 (a)). However, since the parking brake lever 311 is located on the “off (release)” side, the distal end portion 230a of the brake cable 230 is in a slack state at a position where it comes out of the stay 250.

  At this time, since the distal end portion 230a of the brake cable 230 is in a slack state, the operator can hold the parking brake lever 311 with his hand and rotate it from the “OFF (release)” side to the “ON” side. In addition, after that, it is possible to hold the parking brake lever 311 and rotate it from the “ON” side to “OFF (release)”.

  When the parking brake lever 311 is held by hand and rotated from the “off (release)” side to the “on” side, the parking brake pin 301 is moved in the direction of the arrow F (see FIG. 11 (b)), and the tip 301a of the parking brake pin 301 is always pressed against the one end 41 of the traveling second shaft 40. Then, when the operator slightly moves the tiller 100 forward or backward, the left and right traveling wheels 4L and 4R rotate, and the traveling second shaft 40 rotates, and two are formed at one end portion 41 thereof. When either one of the parking brake grooves 41a comes to the position of the tip portion 301a of the parking brake pin 301, the tip portion 301a is inserted into the parking brake groove 41a (see FIG. 11B).

  Thus, the traveling second shaft 40 can be reliably locked without slipping, and the parking brake can be reliably operated even on a slope or an inclined farm field.

  In addition, since the two parking brake grooves 41a are provided on the traveling second shaft 40, there are two places where the parking brake pins 301 can enter, and the brake is applied compared to the case where the parking brake groove 41a is one. The effective timing will be faster.

  Next, when the operator depresses the main clutch lever 18, the operation is as follows.

  Note that immediately before the main clutch lever 18 is pushed down, the parking brake lever 311 is positioned on the “on” side, and the tip portion 301a of the parking brake pin 301 is inserted into the parking brake groove 41a.

  When the operator depresses the main clutch lever 18, the main clutch / brake cable 240 is pulled in the direction of arrow G (see FIGS. 3 and 12A) and the main clutch cable connected to the main clutch / brake cable 240 is pulled. 220 and the brake cable 230 are simultaneously pulled in the direction of arrow G.

  When the main clutch cable 220 is pulled in the direction of the arrow G (see FIG. 12A), the tension roller 211 rotates in the direction of pushing up the transmission belt 203 (see the arrow C in FIG. 5). It will be in the “On” state. Thereby, the output from the engine 15 is transmitted to the transmission mechanism in the mission case 2, the rotation of the axle 4 is started, and the tilling shaft 5 can be rotated.

  On the other hand, when the brake cable 230 is pulled in the direction of the arrow G (see FIG. 12A), the parking brake lever 311 that has been positioned on the “on” side until now is forced to the “off (release)” side. Therefore, the distal end portion 301a of the parking brake pin 301 comes out of the parking brake groove 41a, and the traveling second shaft 40 is unlocked.

  As a result, when the operator performs an operation of depressing the main clutch lever 18 to bring the main clutch 210 into the “on” state, the parking brake lever 311 is always turned to the “off (release)” side, and the traveling Since the locked state of the second shaft 40 is automatically released, it is safe even if an operator neglects to operate the parking brake lever 311.

  Further, the parking brake lever 311 is forcibly moved to the “cut (release)” side, so that the lower surface 314 a of the end of the stopper pin 314 is below the bracket 330 in a state where the spring 320 for supporting the fulcrum has exceeded the fulcrum. The parking brake lever 311 is held in a state of being stopped at the position of “cut (released)” when it hits the upper edge 334 at the rear side.

  Further, in the cultivator 100 according to the present embodiment, the distance to the position of the main clutch lever 18 that the operator holds with his / her hand when the first horizontal shaft 18a that is the rotation center of the main clutch lever 18 is used as a reference ( (Arm length) is compared with the distance (arm length) to the position of the parking brake lever 311 held by the operator when the axis of the bolt 310a that is the rotation center of the parking brake lever 311 is used as a reference. Is set very long.

  Therefore, when the main clutch lever 18 is pushed down, that is, when the main clutch 210 is in the “on” state, the parking brake lever 311 is held at the “disengaged” side position. Even if the person tries to turn the parking brake lever 311 to the “on” side with his / her hand, the “on” of the main clutch lever 18 is determined based on the relationship between the arm lengths of both the arms (the relationship of the arm ratio). The operation force for maintaining the state is much larger, and the operation force for operating the parking brake lever 311 to rotate to the “on” side cannot overcome it and cannot rotate.

  Thus, when the main clutch lever 18 is pushed down and the main clutch 210 is in the “on” state, the parking brake lever 311 can be prevented from being turned to the “on” side, and the transmission mechanism of the traveling system is protected. Is planned.

  In summary, the following can be said.

  1. That is, when the parking brake lever 311 is on the “disengaged” side, the operator can push the main clutch lever 18 down by hand to put the main clutch 210 in the “on” state. By releasing the hand, the main clutch 210 can be set to the “disengaged” state.

  2. When the main clutch lever 18 is released, that is, when the main clutch 210 is in the “disengaged” state, the parking brake lever 311 is on either the “on” side or the “disengaged” side. Can be operated.

  3. When the main clutch lever 18 is pushed down by hand, that is, when the main clutch 210 is in the “ON” state, the parking brake lever 311 is held on the “OFF (release)” side, and “ON” It cannot be operated on the side. The main clutch lever 18 cannot maintain the “on” state of the main clutch 210 unless the operator continues to push down. As a result, when the operator releases his hand from the main clutch lever 18, the main clutch 210 is automatically in the “disengaged” state, so that a safe operation can be performed.

  4). Even when the parking brake lever 311 is on the “on” side, the operator can manually push down the main clutch lever 18 to put the main clutch 210 in the “on” state. At the same time, as described above, the parking brake lever 311 is forcibly moved to the “off (release)” side and the locked state of the traveling second shaft 40 is released.

  As shown in the right side view of FIG. 13, the parking brake pin 301 is provided with a guide tube 601 through which an inner diameter portion 601a passes. The guide tube 601 is configured to be fixed to the L-shaped plate 332 by welding. Thereby, since the length of the guide guide part (receiving part) where the parking brake pin 301 is guided becomes long, the parking brake pin 301 can be prevented from tilting. Therefore, the tip 301a of the parking brake pin 301 is smoothly inserted into the parking brake groove 41a.

  A length 601L of the guide tube 601 is arranged to be close to the traveling second shaft 40. Specifically, when the distal end portion 301a of the parking brake pin 301 is inserted into the parking brake groove 41a, the entire portion of the distal end portion 301a of the parking brake pin 301 is substantially out of the guide tube 601. Configure. Accordingly, the parking brake pin 301 can be reliably held when the rotation of the traveling second shaft 40 is fixed and the parking brake is in an operating state.

  The parking brake pin 301 passes through the hole 332a of the L-shaped plate 332 and passes through the inner diameter portion 601a of the guide tube 601, but the inner diameter portion 601a of the guide tube 601 with respect to the inner diameter D1 of the hole 332a of the L-shaped plate 332. The inner diameter D2 of the head is made large.

  Specifically, the inner diameter D1 of the hole 332a of the L-shaped plate 332 is 10.5 mm, and the inner diameter D2 of the inner diameter portion 601a of the guide tube 601 is 10.9 mm. Thereby, when the parking brake pin 301 changes from the parking release position to the parking position, the parking brake pin 301 is prevented from being caught and the operation to the parking position is ensured.

  As described above, the cover 390 of the resin molded product that protects the rotating portion such as the one end 41 of the traveling second shaft 40 is provided. The cover 390 covers the guide tube 601. Thereby, generation | occurrence | production of the rust by the water at the time of a car wash or rain water can be suppressed. Further, it is possible to prevent such rust and dust from accumulating in the hole 332a of the L-shaped plate 332, the inner diameter portion 601a of the guide tube 601, the parking brake groove 41a of the traveling second shaft 40, and the like.

  As shown in the plan view of FIG. 14, the diameter of the tip 301a of the parking brake pin 301 is smaller than the diameter of the parking brake pin 301 main body. And the diameter part (entire part of the front-end | tip part 301a) of the front-end | tip part 301a of the parking brake pin 301 is set as the structure arrange | positioned inside from the body outer side edge part of the driving | running | working 2nd axis | shaft 40. Thereby, the front-end | tip part 301a of the parking brake pin 301 comes to enter into the parking brake groove 41a stably.

  Further, FIG. 14 shows a fuel tank 19, but the appearance of the fuel tank 19 is shaped like a hood in consideration of design. Further, the fuel tank may have a cubic shape as usual, and a hood having a different configuration may be provided so as to cover the fuel tank. And it is comprised so that the driving | running | working 2nd axis | shaft 40 may not come out with respect to the fuel tank 19 and the hood in planar view. Thereby, it is possible to prevent rust from being generated from the traveling second shaft 40.

  In addition, the cover 390 is configured to be positioned below the fuel tank 19 and the hood. However, a part of the cover 390 is configured to enter the fuel tank 19 or the hood (entrance P) in plan view. Thereby, the water that has fallen along the fuel tank 19 and the hood falls onto the cover 390 and flows to the outside of the aircraft. Thereby, the parking brake mechanism 300 can be protected.

  The cover 390 is configured to be fixed to the mission case 2 at two front and rear positions. A front fixing portion 391A and a rear fixing portion 391B are shown. The front side fixing portion 391A and the rear side fixing portion 391B are configured to be fixed by screws 391a and 391b, respectively. Thereby, the cover 390 is fixed reliably and the parking brake mechanism 300 can be protected.

  In the above-described embodiment, the configuration in which the parking brake lever 311 is provided in the vicinity of the one end portion 41 of the traveling second shaft 40 has been described. However, the configuration is not limited thereto, and the operation handle 17 may be provided anywhere. In this case, it is necessary to pull the parking brake lever 311 to the operation handle 17 with a cable or the like.

DESCRIPTION OF SYMBOLS 1 Airframe 2 Mission case 2a Front side case 2b Rear side case 3 Support frame 4L (Left) Traveling wheel 4R (Right) Traveling wheel 6 Tillage claw 7 Tillage device 15 Engine 16 Belt cover 17 Operation handle 18 Main clutch lever 20 Rotary differential lock clutch Lever 40 Traveling second axis 41a Parking brake groove 100 Pedestrian tiller 301 Parking brake pin 310 Parking brake lever unit 311 Parking brake lever 330 Bracket 332 L-shaped plate (guide member)
601 Guide tube (guide member)

Claims (3)

Traveling wheels (4L, 4R), tilling claws (6) for tilling the farm, engines (15) for rotating the traveling wheels (4L, 4R) and the tilling claws (6), and the engines (15) A transmission case (2) including a transmission mechanism for transmitting the driving force from the engine to the traveling wheels (4L, 4R) and the tilling claw (6), and the transmission of the driving force from the engine (15). A main clutch on / off device (18) for switching whether or not, and one end portion protruding outward from the transmission mechanism of the transmission case (2), and a groove portion (41a) is provided at the one end portion A travel system drive shaft (40), and a parking brake pin (301) that can be inserted into the groove (41a) of the travel system drive shaft (40), prevents rotation of the drive shaft (40). Whether or not to do In walk-behind tiller provided with a parking brake on-off device for performing changing (311),
By switching the parking brake on / off device (311) to the side that prevents the drive shaft (40) from rotating, the parking brake pin (301) is inserted into the groove (41a) to drive the traveling system. The movement of the shaft (40) is locked,
A walk-type tiller provided with a guide member for guiding and guiding the parking brake pin (301).   The walking type tiller according to claim 1, wherein a plurality of guide members for guiding and guiding the parking brake pin (301) are provided.   The walking type tiller according to claim 1 or 2, wherein the guide member is configured to the vicinity of a drive shaft of the traveling system.

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