JP6343551B2 - Management machine - Google Patents

Description

  The present invention relates to a technique for interlocking a work clutch for turning a work of a tillage device of a management machine and a differential lock device for releasing a left and right connection of an axle supporting left and right traveling wheels.

  2. Description of the Related Art Conventionally, an engine is mounted on the front part of a management machine, power from the engine is transmitted to an input shaft of a transmission case via a belt transmission mechanism, and a transmission and a differential lock housed in the transmission case from the input shaft The power is transmitted to the axle with the wheels fixed via the device, and the power can be transmitted from the input shaft to the tillage shaft via the work clutch. The working clutch can be turned on and off by sliding a sliding body on the PTO shaft, and the sliding body is slid by a shifter. The differential lock device has an engaging claw formed on the differential case, supports the sliding body on one side of the axle by spline, and engages the engaged claw formed on the sliding body with the engaging claw of the differential case. A technique that enables an axle to rotate integrally is known (for example, see Patent Document 1).

JP 2014-103941 A

  The conventional work clutch and differential lock device can be turned on and off by operating an operation lever disposed on the side of the mission case, and the operation lever, the shifter, and the sliding body are linked via an operation wire. That is, an operation lever is provided at the rear part of the handle that extends rearward from the mission case, and one end of the operation wire is connected to the operation lever, and the other end of the operation wire is connected to the two sub operation wires via a bifurcated fitting. And one of the two sub-operation wires is linked to the work clutch, and the other is linked to the differential lock device.

  Therefore, in order to operate the work clutch and the differential lock device, two systems of wires and two systems of links on the outside of the mission case are required. Therefore, in order to properly operate the work clutch and the differential lock device, adjustments are required at the time of manufacture, and it is also necessary to adjust them even when elongation occurs due to aging. In addition, operation shafts for operating the respective sliding bodies of the work clutch and the differential lock device are arranged so as to protrude sideways through the transmission case so that oil leakage does not occur in the respective shaft portions. For this reason, a sealing member is provided, which increases the cost. The present invention has been made in view of the above situation, and it is intended to provide an operation structure that can operate a work clutch and a differential lock device with a single wire, has a simple configuration, and can reduce the risk of oil leakage. And

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
That is, according to the first aspect of the present invention, there is provided a management machine in which a handle protrudes rearward from the mission case of the management machine, a work lever is arranged at a rear portion of the handle, and a work clutch and a differential lock device are arranged in the mission case. An operation arm is coupled to a shifter shaft of a work shifter that engages and disengages the work clutch, and the operation arm is fixed to one end of the shifter shaft protruding from the transmission case, The operation arm is connected to the work lever via a connecting member, and the diff lock shifter for turning on and off the differential lock device and the work shifter are connected via a link mechanism in the transmission case. It is.

  According to a second aspect of the present invention, the link mechanism is disposed in the space of the branch portion between the traveling case and the tilling case that constitute the mission case.

  By adopting the above-described configuration, the present invention can reduce the length of the labor by adjusting the length of the wire by one wire compared to the prior art, and can simplify the cooperative configuration between the work clutch and the differential lock device, thereby reducing the cost. it can. Moreover, the shaft for penetrating the mission case can be reduced, and the risk of oil leakage can also be reduced.

The side view of a management machine. A side view of a mission case. The side view which shows the inside of a mission case. Front sectional drawing of a mission case traveling part. Front sectional view of the tillage part of the mission case. The perspective view of a work shifter, a diff lock shifter, and a differential apparatus.

  Below, one Embodiment of the management machine 1 provided with the operating device of the working clutch and differential lock apparatus which concerns on this invention is described. In the following description, the direction of the arrow F in the figure is defined as the forward direction.

  A management machine 1 shown in FIG. 1 includes a mission case 10 arranged at the front and rear center of the machine, an engine 20 arranged on the front part of the machine, wheels 30 and 30 supported on the lower part of the mission case 10, and a rear part of the machine. The rotary cultivating device 4 that is disposed and enables the cultivating work, the control unit 60 disposed above the rotary cultivating device 4 at the rear of the machine, and the like are provided.

  The engine 20 is a drive source. The engine 20 is fixed on an engine frame 21 fixed to the front portion of the mission case 10. Power from the engine 20 is transmitted to the transmission case 10 via the belt transmission mechanism 2. The belt transmission mechanism 2 includes an output pulley 26 fixed on the output shaft of the engine 20, an input pulley 27 fixed on the input shaft 13 protruding from the upper portion of the transmission case 11, the input pulley 27, and the output A belt 28 wound between the pulley 26 and a tension pulley 29 that tensions or relaxes the belt 28. The tension pulley 29 is interlocked with the main clutch lever 63 to perform an "on" operation of the main clutch lever 63. Thus, the belt 28 is tensioned so that power can be transmitted from the engine 20 to the transmission case 11, and the belt 28 is relaxed by an “off” operation of the main clutch lever 63 so that power transmission is interrupted.

  The mission case 10 is configured in a “h” shape when viewed from the side, and is disposed at substantially the center of the left and right sides of the management machine 1. An axle 31 (31L / 31R) is supported on the front lower portion of the traveling case 11 extending forward and downward, Wheels 30 and 30 are fixed to both sides of the axles 31L and 31R. A rotary tiller 4 is provided at the rear part of the mission case 10, and the rotary tiller 4 has a tiller shaft 41 horizontally mounted on the rear lower part of the tiller case 12 that extends downward and rearward of the mission case 10. .. Are fixed at appropriate intervals. The upper part of the rotation trajectory of the cultivation claws 42, 42... Is covered with a cultivation cover 43. A resistance rod 44 and a tail wheel 45 are provided at the rear of the tillage cover 43. A transmission, a clutch, and the like, which will be described later, are housed in the upper part of the mission case 10, and the power from the engine 20 is shifted and transmitted to the wheels 30 and the rotary tiller 4.

  The control unit 60 is for performing various operations for causing the management machine 1 to travel and work. The steering unit 60 has a handle 61 and a shift lever 62 projecting upward and backward from the upper part of the mission case 10. The rear part of the handle 61 is a control part 60, and a main clutch lever 63, a work lever 64, an accelerator lever, and the like are arranged at the rear part of the handle 61.

  Next, the configuration within the mission case 10 will be described with reference to FIGS. In the transmission case 10, an input shaft 13, a transmission shaft 14, an intermediate shaft 15, a travel output shaft 16, a PTO shaft 17, a shifter shaft 18, a diff-lock shifter shaft 19, an axle 31, a tilling shaft 41, etc. are horizontally mounted, via bearings. And is supported rotatably.

  One end of the input shaft 13 protrudes laterally (leftward), and an input pulley 27 that constitutes a belt transmission mechanism is fixed. An input gear 70 is slidably fitted on the input shaft 13 in the mission case 10, and the input gear 70 is connected to a first transmission gear 71, a second transmission gear 72, a transmission gear 73 and a counter gear 74, which will be described later. It is arranged so that it can be engaged.

  A first transmission gear 71 and a second transmission gear 72 are slidably fitted on the transmission shaft 14 in a splined manner. A shifter fork is fitted to each of the input gear 70, the first transmission gear 71, and the second transmission gear 72. The shifter forks are respectively fixed to a shifter shaft (not shown), and the shifter shaft is slid by the operation of the transmission lever 62. Is done. The first transmission gear 71 is disposed so as to be able to mesh with the input gear 70, the transmission gear 73, and a travel input gear 75 described later, and the second transmission gear 72 can be engaged with the input gear 70 and a counter gear 74 described later. It is arranged.

  A transmission gear 73, a counter gear 74, and a tooth portion 15a are disposed on the intermediate shaft 15. The transmission gear 73 is fixed on the intermediate shaft 15, and the counter gear 74 is rotatably supported via a bearing. The part 15 a is formed on the intermediate shaft 15. The transmission gear 73 is disposed so as to be able to mesh with the input gear 70 and the first transmission gear 71. The counter gear 74 is always meshed with the input gear 70 and a PTO input gear 77 described later. The tooth portion 15a is always meshed with the traveling input gear 75.

  A travel input gear 75 and a travel output sprocket 76 are fixed on the travel output shaft 16. The travel input gear 75 can be meshed with the first transmission gear 71, and is always meshed with the tooth portion 15a. The traveling output sprocket 76 is wound around one side of the traveling transmission chain 80. The other side of the traveling transmission chain 80 is wound around a sprocket 33 formed on the outer periphery of the differential case 32a of the differential device 32 provided on the axles 31L and 31R.

  As shown in FIG. 5, a PTO input gear 77 is rotatably supported on the PTO shaft 17, a PTO output sprocket 78 is fixed, and a work clutch 79 is further provided. The working clutch 79 is provided with an engaging claw on a sliding body that is spline-fitted so as to be slidable on the PTO shaft 17, and the engaging claw is configured to be engageable with an engaging claw formed on the PTO input gear 77. Yes. The PTO input gear 77 is always meshed with the counter gear 74. The tillage transmission chain 81 is wound around the PTO output sprocket 78. The other side of the tillage transmission chain 81 is wound around a sprocket 46 fixed on the tillage shaft 41.

  In such a configuration, by operating the speed change lever 62, the speed is changed at the high speed stage, the low speed stage, the reverse speed stage, and the work stage. In the high speed stage, the power transmitted to the input shaft 13 is input gear 70 → first transmission gear 71 → travel input gear 75 → travel output shaft 16 → travel output sprocket 76 → travel transmission chain 80 → sprocket 33 → diff device 32. → It is reported as axle 31L / 31R. At the low speed stage, the input gear 70 → the transmission gear 73 → the intermediate shaft 15 → the tooth portion 15a → the traveling input gear 75 → the traveling input gear 75 → the traveling output shaft 16 → the traveling output sprocket 76 → the traveling transmission chain 80 → the sprocket 33 → the differential device. 32 → Axle 31L / 31R. In the reverse gear, the input gear 70 → the first transmission gear 71 → the transmission gear 73 → the intermediate shaft 15 → the tooth portion 15a → the traveling input gear 75 → the traveling output shaft 16 → the traveling output sprocket 76 → the traveling transmission chain 80 → the sprocket 33 → the differential Device 32 → axes 31L and 31R are transmitted. In the working stage, the input gear 70, the counter gear 74, the PTO input gear 77, the PTO shaft 17, the PTO output sprocket 78, the tilling transmission chain 81, the sprocket 46, and the tilling shaft 41 are transmitted.

  Next, the interlocking structure of the working clutch and the differential lock device will be described with reference to FIGS. The shifter shaft 18 is disposed below the intermediate shaft 15 and at substantially the center of the transmission case 10 between the traveling output shaft 16 and the PTO shaft 17 in the front, rear, top and bottom. One side (right side) of the shifter shaft 18 protrudes laterally from the mission case 10, and one end of the operation arm 67 is fixed on one end (right end) of the shifter shaft 18. A wire 68 is connected to the other end of the operation arm 67, and the other end of the wire 68 is connected to the working lever 64 of the control unit 60.

  A work shifter 5 is provided on the shifter shaft 18 in the mission case 10. The work shifter 5 includes a shifter shaft 18, a shift fork 82, a cam 83, a spring 84, and a pin 85, and a first link 51 constituting the link mechanism 50 is fixed on the shifter shaft 18. The cam 83 is slidably fitted onto the shifter shaft 18, and a cam profile is formed at one end (left side) of the cam 83 and is brought into contact with a pin 85 inserted and fixed in the diameter direction of the shifter shaft 18. A shift fork 82 is fitted on the other side of the cam 83 and urged by a spring 84 so as to slide toward the pin 85 side. The front end of the shift fork 82 is fitted into the fork groove of the work clutch 79 and is biased toward the clutch “on” side by the biasing force of the spring 84.

  The first link 51 extends downward from between the travel output shaft 16 and the PTO shaft 17, and one end of the second link 52 is connected to the tip via a pivot shaft. The other end of the second link 52 extends forward, and one end of the third link 53 is connected to the tip via a pivot shaft. The other end of the third link 53 extends downward and is fixed to the differential lock shifter shaft 19. Thus, the link mechanism 50 is disposed in the space divided from the upper part of the mission case 10 into the traveling case 11 and the tilling case 12, and is disposed on the left side of the traveling transmission chain 80.

  A differential lock shifter 6 is provided on the differential lock shifter shaft 19 in the mission case 10. The diff lock shifter 6 includes a cam 86, a shift fork 87, a spring 88, a pin 89, and a diff lock shifter shaft 19, and the third link 53 is fixed on the diff lock shifter shaft 19. The cam 86 is slidably fitted onto the differential lock shifter shaft 19, and a cam profile is formed at one end (left side) of the cam 86 and abuts against a pin 89 inserted and fixed in the diameter direction of the differential lock shifter shaft 19. A shift fork 87 is fitted on the other side of the cam 86 and is urged by a spring 88 so as to slide toward the pin 89 side. The third link 53 and the shift fork 87 are disposed on opposite sides of the traveling transmission chain 80.

  The front end of the shift fork 87 is fitted to the sliding body 34 of the differential lock device 90 provided on the axles 31L and 31R. The differential lock device 90 fixes the differential device (differential device) 32 (so as not to operate) and integrally rotates the left and right axles 31L and 31R. In this embodiment, the differential case 32a is driven by the sliding body 34. The inner pinion 35 is fixed to the axle 31R. The differential device 32 inserts the inside of the left and right axles 31L and 31R into the differential case 32a, fixes the pinions 35 and 35 to the inner ends of the axles 31L and 31R, and can freely rotate to the differential case 32a on the left and right pinions 35 and 35. The pinions 36 and 36 pivoted on the teeth are engaged with each other. And the latching | locking part of the sliding body 34 spline-fitted on the axle shaft 31R is arrange | positioned at the latching | locking part of the right side pinion 35 so that engagement is possible. The shift fork 87 and the sliding body 34 are urged in the differential lock direction by the spring 88. However, the configuration of the work shifter 5 and the differential lock shifter 6 is not limited, and may be a configuration in which the shaft and the shift fork are slid. Further, the configuration of the differential lock device 90 is not limited.

  In the above configuration, when the work lever 64 is rotated in the “in” direction, the operation arm 67 is rotated downward via the wire 68, and the shifter shaft 18 is also rotated. By this rotation, the cam 83 is rotated and the shift fork 82 is moved to the left by the urging force of the spring 84, the work clutch 79 is turned “on”, and the power of the engine 20 is transmitted to the rotary tiller 4. It is done.

  Simultaneously with the rotation of the shifter shaft 18, the differential lock shifter shaft 19 is rotated through the link mechanism 50 (the first link 51, the second link 52, and the third link 53), and the cam 86 is rotated by this rotation. Then, the shift fork 87 is moved to the left by the urging force of the spring 88, the sliding body 34 of the differential lock device 90 is moved and engaged with the pinion 35 and differentially locked, and the axles 31L and 31R are simultaneously driven in the same rotation. The straightness during tillage work is improved.

  As described above, the handle 61 is protruded rearward from the upper portion of the mission case 10 disposed in the center of the management machine 1, the work lever 64 is disposed at the rear of the handle 61, and the work clutch is disposed in the mission case 10. 79 and a diff lock device 90 are arranged, and an operation arm 67 is connected to the work shifter 5 that engages and disengages the work clutch 79. The operation arm 67 is connected to the operation lever 64 via a connecting member, and the diff lock device 90 is connected. Since the diff lock shifter 6 to be turned on and off and the work shifter 5 are connected via the link mechanism 50 in the mission case 10, one wire can be reduced compared to the conventional case, and the labor for adjusting the length can be reduced, and the work clutch 79 And the diff lock device 90 can be simplified, and the cost can be reduced. Moreover, the axis | shaft for penetrating the mission case 10 can be reduced, and the risk of oil leakage can also be reduced.

  Further, since the link mechanism 90 is arranged in the space of the branching portion between the traveling case 11 and the tilling case 12 constituting the mission case 10, the link mechanism 90 uses a space that does not interfere with the transmission and the chain transmission mechanism. Can be placed. Further, the link mechanism 50 can be connected in the shortest without being enlarged.

DESCRIPTION OF SYMBOLS 1 Control machine 5 Work shifter 6 Differential lock shifter 10 Mission case 50 Link mechanism 61 Handle 64 Work lever 67 Operation arm 68 Wire 79 Work clutch 90 Differential lock device

Claims (2)

A management machine in which a handle protrudes rearward from the mission case of the management machine, a work lever is arranged at the rear part of the handle, and a work clutch and a differential lock device are arranged in the mission case,
An operation arm is connected to the shifter shaft of the work shifter that turns on and off the work clutch,
The operation arm is fixed to one end of the shifter shaft protruding from the mission case, and is disposed outside the mission case.
The operating arm is connected to the work lever via a connecting member,
The diff lock shifter for turning on and off the diff lock device and the work shifter are connected through a link mechanism in the mission case.   The management device according to claim 1, wherein the link mechanism is disposed in a space of a branch portion between a traveling case and a tilling case that constitute the mission case.

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