JP2013170654A - Walking type cultivator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walking type cultivator with a parking brake which improves the stabilization and handleability of tillage operation by the cooperation of a deadman lever type clutch and a parking brake, and enables efficient and stable tillage operation by securing wide responsiveness depending on conditions.SOLUTION: A brake device (9) for parking includes a brake member (13) making a braking force act on an output shaft (3a) of a clutch device (8), an over-fulcrum spring (14) for holding the brake member (13) to a braking position and a not-braking position, respectively, and a retracting member (15) integral with the brake member (13) to retract the brake member from the braking position according to received action. The movable range of the clutch member (12) is provided in a position where the clutch member (12) at a transmission position acts on the retracting member (15) of the brake member (13) at a braking position within a range where the brake member is held at the side of the braking position, whereby braking can be controlled in conjunction with the operation of a clutch lever (8a).

Description

  The present invention relates to a walking-type field cultivator for performing field cultivation work by a body operation of a walking worker.

  The walking type tiller of Patent Document 1 includes a clutch lever and a brake lever, performs a tilling operation by operating the clutch lever, and can stably hold the machine body at the stop position by operating the brake lever during parking. In addition, by providing a linkage mechanism for the alternate operation of the clutch lever and brake lever, it is possible to prevent danger due to unstable behavior of the aircraft due to power transmission due to erroneous operation of the lever and competitive operation of the brake, and transmission system Damage can be avoided.

JP 2011-182758 A

  An object of the present invention is to provide a walk-type field cultivator with a parking brake that enables interlocking operation of a parking brake while ensuring operability of a deadman clutch lever.

  The invention according to claim 1 includes an engine (2), a traveling device (5), a tilling device (6), and a transmission device (3) for transmitting engine power to the traveling device (5) and the tilling device. In order to transmit engine power to the transmission device (3), the transmission is turned on and off by a belt tension type clutch device (8). The clutch device (8) is connected to the handle (7) for walking operation. The clutch member (12) is configured to switch between a non-transmission position and a transmission position by operating a clutch lever (8a) provided. When the clutch member (12) grips the clutch lever (8a), the clutch member (12) is switched to the transmission position. ) Is a deadman type structure that switches to the non-transmission position when released, and is provided with a parking brake device (9) that brakes the transmission device (3). The braking device (9) creates braking force on the transmission device (3). A brake member (13) for switching to a non-braking position where no braking force is applied to the braking position or transmission device (3) is provided, and when the brake member (13) is switched to the non-braking position, the clutch member (12) is not transmitted When the brake member (13) is switched to the braking position, the clutch member (12) in the transmission position is switched to the non-transmission position or the clutch member (12 in the non-transmission position). In order to restrict the switch to the transmission position, a retractable member (15) connected to the brake member (13) acts on the clutch member (12).

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a brake lever (9a) for switching the position of the brake member (13) is provided extending rearward from the clutch device (8). .

  According to a third aspect of the present invention, in the first or second aspect of the present invention, an adjustment member for changing a working position is provided at a portion where the clutch member (12) acts on the retracting member (15). It is characterized by that.

  The invention according to claim 4 is characterized in that, in the invention according to claim 3, the adjustment member is constituted by an adjustment bolt (15a) for adjusting the protrusion length.

  According to the first aspect of the invention, while ensuring safety and operability due to the deadman-type lever structure, it is possible to prevent erroneous operation that causes the clutch member (12) to enter when the braking device (9) is operated to the braking position. can do.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the transmission switching operation can be performed by the clutch lever (8a) provided on the handle (7), and the brake extending from the clutch device (8) to a position spaced downward is provided. Since the brake switching operation can be performed by the lever (9a), transmission and braking can be operated without confusion.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, when the transmission position of the clutch member (12) in the belt tension type clutch device (8) fluctuates due to secular change or the like. By adjusting the operating position with the adjusting member, the cooperative relationship between the clutch member (12) and the retracting member (15) can be ensured.

  According to the invention according to claim 4, in addition to the effect of the invention according to claim 3, the length adjustment bolt (15a) having a simple structure enables adjustment by a simple operation with a simple structure.

Side view of the walking type tiller of the present invention Mechanism operation diagram of clutch device when not transmitting (a) and transmitting (b) Mechanism diagram of action relationship between clutch member and brake member Side view of the relationship adjusting section between the clutch member and the brake member Linkage mechanism diagram between clutch member and brake member Linking mechanism diagram by cable Transmission configuration development diagram of the transmission Transmission configuration development diagram of another example transmission device Plan view (a), side view (b), shift guide diagram (c) of transmission operation mechanism

Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
As shown in a side view of FIG. 1, a walking type tiller 1 to which the present invention is applied has an engine 2 mounted on the front part of the machine body and a transmission device 3 provided with various transmission gears on the rear side. The transmission case 4 is configured to transmit to the traveling device 5 and the rotary tilling device 6 using a pair of left and right traveling wheels, and includes a handle 7 for operating the machine body that extends rearward from the transmission case 4.

  A belt tension type clutch device 8 is provided between the engine 2 and the transmission case 4, and a clutch lever 8 a for operating the clutch device 8 is configured to be a deadman type on the handle 7 for traveling and tilling. The shift lever 3s extends rearward from the transmission device 3.

A braking device 9 for parking is formed adjacent to the clutch device 8, and a brake lever 9 a is extended rearward from the braking device 9 and arranged below the clutch lever 8 a.

  The clutch device 8 includes a first pulley 11 a provided on the main shaft 2 a of the engine 2 and a first transmission shaft of the transmission device 3, as shown in FIG. 2 when the mechanism is in non-transmission (a) and transmission (b). An idle pulley arm configuration comprising a transmission belt 11 wound around a second pulley 11b provided on 3a and adjusting a belt tension for switching between a non-transmission position and a transmission position via a connecting wire 8b by a clutch lever 8a The clutch member 12 is provided, and the engine power can be connected and disconnected by operating the clutch lever 8a.

  The braking device 9 includes a brake member 13 that switches between a braking position where a braking force is applied to the input side of the transmission device 3 such as the second pulley 11b and a non-braking position by a brake lever 9a, and the brake member 13 that is a pivot fulcrum. A fulcrum overspring 14 elastically held at a braking position or a non-braking position with the position of 13a as a boundary, a retracting member 15 configured to rotate integrally with a brake member 13 described later, and an adjusting member attached to the retracting member 15 (Bolt) 15a is provided.

2 (a) and 2 (b) will be described in detail.
When the brake lever 9a is operated in a state where the brake member 13 and the second pulley 11b are not in contact with each other, that is, in a non-braking position, the clutch lever 8a is operated, that is, when the operator grips the clutch member by the connecting wire 8b. 12 switches to a transmission position (refer FIG.2 (b)). When the operator releases the clutch lever 8a, the clutch member 12 is switched to the non-transmission position.

  When the clutch member 12 is in the transmission position, the brake lever 9a is operated to rotate the brake member 13 around the rotation fulcrum 13a and contact with the second pulley 11b, that is, the brake position. The member 15 rotates integrally with the brake member 13, and the retracting member 15 (adjustment member 15a) contacts the clutch member 12 to switch the clutch member 12 to the non-transmission position (see FIG. 2A). In this state, even if the operator holds the clutch lever 8a, the clutch member 12 abuts on the retracting member 15 (adjustment member 15a), and the clutch member 12 is restricted from switching to the transmission position. That is, the vehicle is parked.

  The transmission position of the clutch member 12 changes due to, for example, the extension of the transmission belt 11 over time. Therefore, by adjusting the adjustment member 15a, it is possible to cope with a change in the transmission position by adjusting the operation position of the clutch member 12 and the retracting member 15 (adjustment member). The adjustment member 15a of this embodiment can be easily adjusted by using a bolt.

  In this way, when the brake member 13 is set to the non-braking position, transmission of the transmission by the deadman type clutch lever 8a can be made freely. Further, when the brake member 13 is set to the braking position, the clutch member 12 is switched to the non-transmission state when the clutch member 12 is in the transmission state, and is switched to the transmission state when the clutch member 12 is in the non-transmission state. It is possible to prevent an erroneous operation of performing the tilling work as it is.

  Further, by disposing the clutch lever 8a on the handle 7 and disposing the brake lever 9a extending from the clutch device 8 below the handle lever 7, it is possible to avoid erroneous operation due to the close arrangement of the levers and to ensure the respective operability.

  FIG. 3 shows another embodiment of FIG. 2, and the operation relationship between the clutch member 12 and the brake member 13 in the clutch device 8 is within the holding range on the brake position side with respect to the retracting member 15 of the brake member 13 in the brake position. By providing a movable range around the fulcrum 12b by pivotally supporting the clutch member 12 at a position where the action portion 12a of the clutch member 12 in the transmission position acts, the clutch device 8 and the braking device 9 are operated according to the operation of the clutch lever 8a. Can be adjusted in conjunction with.

  That is, when the brake member 13 is elastically held at the braking position by the fulcrum spring 14 by the operation of the brake lever 9a, the clutch member 12 moves to the transmission position from the positional relationship between the clutch member 12 and the brake member 13. By acting on the retracting member 15 at this time, the brake member 13 is retracted from the braking position within the holding range on the braking position side in accordance with the amount of the action, so that the transmission power of the transmission belt 11 by the clutch member 12 can be reduced. The braking force by the brake member 13 is adjusted complementarily.

  In this case, when the clutch lever 8a is released, the vehicle travel is stopped and the braking device 9 is interlocked to operate the parking brake. The transmission operation of the clutch lever 8a is started again and the parking brake is interlocked. Canceled. This interlocking relationship is canceled by switching the brake member 13 to the non-braking position by an arbitrary release operation of the brake lever 9a.

  FIG. 4 shows another embodiment of FIG. 2, and for adjusting the relationship between the clutch member 12 and the brake member 13, as shown in a side view of the relationship adjusting portion in FIG. By disposing the brake member 13 along the retracting member 15 and providing an adjustment bolt 15a for adjusting the position between the two members and adjusting the relative positions thereof, the transmission belt 11, the brake member 13, and other changes due to changes over time. Interlocking can be ensured by adjusting the displacement of the operating position.

(Floating link type)
Next, a linkage mechanism using a floating link between the clutch member 12 and the brake member 13 will be described.
FIG. 5 shows another embodiment of FIG. 2, in which a floating link 21 is provided integrally with the clutch member 12, and a pin 22 having a long hole 21 a formed in the floating link 21 is provided in the retracting member 15. The same linkage mechanism as described above can be configured.

  Further, when the brake member 13 is in the braking position, the idle link 21 is configured so that the clutch member 12 in the transmission position retracts the brake member 13 to the non-brake position side via the idle link 21. The parking brake being operated by the operation of the lever 9a is released in conjunction with the transmission operation of the clutch lever 8a, and is held at the non-braking position without requiring the operation force of the brake member 13, and the clutch lever 8a thereafter The operation load is reduced.

  FIG. 6 shows another embodiment of FIG. 2, in which a connecting wire 31 is branched from a clutch lever 8 a that is connected to the clutch member 12 and is connected to the retracting member 15 of the brake member 13. The connecting portion of the retracting member 15 is configured to be able to act on the retracting member 15 in one direction by providing a locking member 32 such as a ball at the end of the connecting wire 31.

  With the above-described configuration, the clutch member 12 is moved to the transmission position by the operation of the clutch lever 8a, and the brake member 13 is moved to the non-braking side via the connecting wire 31 and the locking member 32. Since the parking brake is held in the non-braking position, the parking brake can be released in conjunction with the operation of the clutch lever 8a, and can be held in the non-braking position without requiring the operating force of the connecting wire 31.

(Shift lever type linkage mechanism)
Next, the linkage mechanism of the parking brake by the shift lever will be described.
This linkage mechanism is configured such that the braking device can be operated and released by the shift lever 3 s by attaching a braking device to the transmission device 3. Specifically, as shown in a transmission configuration development diagram of the transmission device 3 in FIG. 7, the transmission device 3 includes a first transmission shaft 3a that receives engine power, a forward F1 gear 50a, and a reverse R1 gear 50b. A transmission gear 51 to the tilling device 6 is provided, and a shift gear 43 and a transmission gear 53 to the traveling device 5 are provided on the second transmission shaft 42 in parallel with the first transmission shaft 3a. When the shift gear 43 is moved by the shifter 43 a and engaged with the traveling forward gear 50 a or the reverse gear 50 b, the power of the first transmission shaft 3 a is transmitted to the transmission gear 53 to the traveling device 5 and travels. . Transmission to the cultivating device 6 is switched on and off with the transmission gear 51 by means of a cultivating shift gear 54.

A restraining member 44 that restrains the shift gear 43 at a predetermined shift position is pivotally supported on the second transmission shaft 42 and is engaged with a detent 45a provided on the gear case 45 side so as to be a fixed side. A plurality of gear docks 46 are formed between the restraining member 44 and the concave and convex portions.

  By configuring the transmission device 3 as described above, the shift gear 43 is engaged with the restraining member 44 on the fixed side at the position P of the shift guide 47 for position selection by the operation of the shift lever 3s coupled via the shifter 43a. By doing so, the transmission system from the shift gear 43 to the traveling device 5 is restrained, and the vehicle body can be parked. Therefore, the transmission device 3 has a simple configuration in which a braking device is configured, and by a simple operation of the shift lever 3s. Driving and parking can be switched by operating the transmission system and switching the restraint.

  In this case, the neutral position T that is non-transmission is provided between the shift output position of the shift guide 47 and the position P where the restraint member 44 is fitted and the parking brake operates, thereby switching from the transmission state to the parking brake. Unnecessary load due to sudden change in power transmission can be kept small. Further, the parking brake device can be simply configured by engaging the locking member 44 with the second transmission shaft 42 and engaging with the rotation stop 45a on the gear case 45 (transmission case 4) side of the transmission device 3. Can do.

  Further, the shift guide 47 of the present embodiment is configured so that the tillage shift gear 54 is the transmission gear when the parking brake is at the position P by changing the position from the forward F1 position to the tillage (rotary) state. 51 does not engage, and there is no malfunction which a tilling apparatus drives with a parking brake applied.

In addition, as shown in a transmission configuration development diagram of the transmission device in FIG. 8, another configuration example is a first transmission shaft that receives engine power via a belt tension type clutch device 8 interposed between the main shaft 2 a and the engine. A shift gear 43 is slidably provided on 3a by a shifter 43a operated by a shift lever 3s, and the shifter 43a clutch member 12 is connected by a connecting wire 52.
A transmission gear 55 is provided on the second transmission shaft 42 and is configured to transmit to the traveling device 5 and the tilling device 6 although not shown.

  That is, the restraint member 44 with which the shift gear 43 is fitted at a predetermined transmission position is pivotally supported on the first transmission shaft 3a and engaged with a rotation stopper 45a provided on the gear case 45 (transmission case 4) side of the transmission device 3. Thus, a braking device for parking brake that does not transmit to the subsequent process from the shift gear 43 to the traveling device 5 is configured, and is connected to the clutch member 12 of the clutch device 8 from the shifter 43a of the shift gear 43 via the connecting wire 52. It is a configuration.

  The clutch device 8 and the transmission device 3 configured as described above operate the shift gear 3s with the shift lever 3s to disengage the transmission gear 55, and engage the shift gear 43 on the first transmission shaft 3a with the restraining member 44. By doing so, the first transmission shaft 3 a is restrained and is not transmitted to the traveling device 5 and the tilling device 6. At the same time, transmission of the clutch device 8 is released via the connecting wire 52 which is a linking member. Therefore, the walking type tiller configured as described above can be parked by a simple operation of the shift lever due to the simple configuration of the braking device by the restraining member 44 configured in the transmission device 3 and the linkage member 52 of the clutch device 8. . Further, since the clutch member 12 is disengaged when the shift gear 43 is in the parking position, the power from the engine 2 is not transmitted to the first transmission shaft 3a that is constrained, so that damage can be prevented.

(Direct acting)
Next, a transmission operation mechanism according to another embodiment in which the clutch device is directly operated by the shift lever will be described.
FIG. 9 is a plan view (a), a side view (b), and a position sketch (c) of the shift guide of the transmission operation mechanism.
The shift lever 61 is formed to be bent laterally from the fulcrum (left in the example in the figure), and its base is pivotally supported by the vehicle width direction shaft 62 and supported by the vertical shaft 63 so as to be laterally movable. At the same time, a shifter 61s extending rearward is integrally formed. In the clutch device 8, the output pulley 11 b is arranged close to the side of the shift lever 61.

  The shift lever 61 is provided with a braking member 64 that elastically acts on the side output pulley 11b to suppress rotation, and the clutch member 12 is connected to the shift lever 61 on the other side when switched to the transmission position. There is provided a linkage member 65 that acts to rotate.

  With respect to the movable range of the upper stage A, middle stage B, and lower stage C of the shift lever 61 in the vertical direction, the middle stage B and the lower stage C are configured so that the shift position of traveling and tilling by the shifter 61s can be selected, and the upper stage A position is set as a braking member 64 and the linkage member 65 are configured as a shift guide 66, and the P position of the side end thereof is set as a parking brake position by the braking member 64, whereby the shift lever 61 is operated to the P position to allow the traveling device 5 to operate. When the clutch device 8 is switched to the transmission side at the P position, the shift lever 61 is rotated from the P position to the other side via the linkage member 65. Since the restraint by the braking member 64 is released, the parking brake is released in conjunction with the transmission of engine power by releasing the clutch.

DESCRIPTION OF SYMBOLS 1 Walking type tiller 2 Engine 3 Transmission device 3a 1st transmission shaft 3s Shift lever 5 Traveling device 6 Tillage device 7 Handle 8 Clutch device 8a Clutch lever 9 Braking device 9a Brake lever 12 Clutch member 13 Brake member 15 Retraction member 15a Adjustment bolt

Claims (4)

An engine (2), a traveling device (5), a tilling device (6), and a transmission device (3) for transmitting engine power to the traveling device (5) and the tilling device;
In order to transmit engine power to the transmission device (3), the belt transmission type clutch device (8) is configured to turn the transmission on and off, and the clutch device (8) is a clutch provided on the handle (7) for walking operation. The clutch member (12) is switched between a non-transmission position and a transmission position by operating the lever (8a). When the clutch member (12) grips the clutch lever (8a), the clutch member (12) is switched to the transmission position, and the clutch lever (8a) is moved. A deadman configuration that switches to a non-transmission position when released,
A parking brake device (9) for braking the transmission (3) is provided;
The braking device (9) is provided with a brake member (13) for switching to a braking position where a braking force is applied to the transmission device (3) or a non-braking position where the braking force is not applied to the transmission device (3).
When the brake member (13) is switched to the non-braking position, the clutch member (12) can be switched between the non-transmission position and the transmission position, and when the brake member (13) is switched to the braking position, the clutch is in the transmission position. A retraction member (15) coupled to the brake member (13) is a clutch to switch the member (12) to the non-transmission position or to restrict the clutch member (12) in the non-transmission position from switching to the transmission position. A walking type tiller which acts on a member (12).   The walking type tiller according to claim 1, wherein a brake lever (9a) for switching the position of the brake member (13) is provided extending rearward from the clutch device (8).   The walking type field cultivator according to claim 1 or 2, wherein an adjustment member for changing an operation position is provided at a portion where the clutch member (12) acts on the retracting member (15). .   The walk type cultivator according to claim 3, wherein the adjustment member comprises an adjustment bolt (15a) for adjusting a protrusion length.

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