JP2008017803A - Lifting operation device for implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting operation device for an implement, furnished with a plurality of indication means to direct the change of the height of an implement connected to the rear part of a tractor, enabling smooth lifting and lowering operation of the implement by quick selection and preventing malfunction. <P>SOLUTION: The lifting operation device for an implement is provided with an operation tool to lift or lower the implement connected to the rear part of a tractor and placed on an armrest 21 supported at a side of an operator's seat 7. The operation tool is composed of two series of indication means 21a, 21b to direct the change of the height of the implement and these indication means are placed on the upper surface of the front end of the armrest 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work implement lifting operation device for lifting and lowering a work implement connected to the rear portion of a tractor.

As shown in Patent Document 1, a work implement lifting operation device for raising and lowering a work implement connected to a rear portion of a tractor includes an operation tool for raising and lowering a work implement, and the operation implement on a side portion of a driver seat. It is provided on the supported armrest. The operating tool incorporates two knobs and two-push button type indicating means at the front end of the armrest, so that the operating position can be changed as needed to change the height position of the work implement. Can be directed.
JP 2005-335429 A

However, since the two-selection push button type operation tool of the two-system instruction means is arranged on the inner surface of the armrest (FIG. 3), the work implement lifting and lowering operation device is operated by groping. Or, since it is necessary to confirm the position of the operation tool by moving the line of sight, there will be a timing delay between them, and a series of field work flow accompanied by lifting and lowering of the work machine required for each turn of the machine for reciprocating work travel May be disturbed, and the stacking may cause a reduction in work efficiency.
Also, in the tractor, depending on the type of work, the operator takes various postures, such as taking a standing posture or changing the direction of the body. The button-type operation tool may be touched, causing malfunction.

  An object of the present invention is to provide a plurality of instruction means for instructing to change the height position of a work machine connected to the rear part of a tractor, and to enable a smooth raising / lowering operation of the work machine by its quick selection and to malfunction. An object of the present invention is to provide a work machine lifting operation device that can prevent the above.

  The invention according to claim 1 provides an armrest (21) supported on the side of the driver's seat (7) with an operating tool for raising and lowering a working machine connected to the rear part of the tractor. It comprises two systems of instruction means (21a, 21b) for instructing to change the height position, and these are arranged on the upper surface of the front end portion of the armrest (21).

  With the above configuration, when instructing to change the height position of the work implement, two types of instruction means can be properly used according to the situation, and both are arranged on the upper surface of the front end portion of the armrest, and both are simultaneously Within the operator's field of view. Further, the two-system instruction means do not touch the body even if the operator's working posture changes.

According to a second aspect of the present invention, in the configuration of the first aspect, the operating tool moves the height position of the work implement from a low position to a high position corresponding to a sliding operation in the stroke range (S) in the front-rear direction of the armrest (21). A slide type instruction means (21a) for instructing a change within a predetermined range up to the position, a lowering operation instruction section (D) for instructing an ascending / descending operation of the work implement by a two-select push button operation, and an ascent operation instruction section (U) The armrest (21) is configured by two-selection indicating means (21b) arranged at the front-rear direction position.
The work implement lifting / lowering operation device having the above configuration can be arranged within the width of the armrest by aligning the longitudinal direction of the two systems of instruction means by the slide operation and the two-select push button operation, and the direction of the operation flow line And the working direction of the work machine are shared.

  According to the configuration of claim 1, when instructing to change the height position of the work implement, two types of instruction means can be properly used depending on the situation, both of which are arranged on the upper surface of the front end portion of the armrest. Since both of them are within the operator's field of view, smooth lifting and lowering operation of the work machine is possible by quick selection at any time without requiring groping or line-of-sight switching. Efficient work can be performed without disturbing the flow of a series of field work accompanied by the lifting and lowering of the work implement, and malfunction due to the work posture of the operator in the cabin can be prevented.

  According to the configuration of claim 2, by aligning the longitudinal direction of the two-system indicating means by the slide operation and the two-selection push button operation, it can be compactly arranged within the width of the armrest. Since the relationship between the position and the operation direction of the work implement is common, a smooth ascending / descending instruction based on common elevating operation recognition can be performed even by switching the operation mode.

Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
An agricultural tractor 1 as an example of a work vehicle according to the present invention is attached to a bonnet that covers a front portion of an airframe having front wheels 2, 2 and rear wheels 3, 3 as shown in FIG. The engine 4 shown in the figure is mounted, the rotational power of the engine 4 is transmitted to the transmission transmission 5a in the transmission case 5, and the power appropriately decelerated by the transmission transmission 5a is transmitted to the front wheels 2, 2 and the rear wheels 3, 3 And a rear output to a working machine connected to a 3P link (illustrated) via a PTO shaft (illustrated).

F2 / cabin As shown in the plan view of the main part of FIG. 2, a driver's seat 7 is disposed in the upper position of the mission case 5 in the cabin, and gently on one side of the driver seat 7. In addition to the armrest 21 having an outer curved surface and an operation panel device 22 on the outer side thereof, a parking brake 7b and first and second PTO change levers 7c and 7d are arranged on the other side of the driver seat 7. Thus, a forward / reverse switching lever 11a is disposed in the vicinity of the steering handle 11, and traveling operation tools such as a clutch pedal 11b, left and right brake pedals 11c and 11d, and an accelerator pedal 11e are disposed at the base.

  The first PTO change lever 7c changes the PTO rotation according to the position of “2nd speed” − “N (neutral)” − “1st speed” from the front. The second PTO change lever 7d is for forward / reverse switching (forward rotation on the front side and reverse rotation on the rear side). As a variation, the economy PTO switching lever (front side is “OFF”, rear side is “ON”) When “ON” is selected, the rotation of the PTO is reduced by a predetermined amount. When the ground PTO switching lever is on (“OFF” on the front side and “ON” on the rear side), the rotation of the PTO is synchronized with the vehicle speed.

F3 / Driver Seat As shown in the perspective view of the main part of the driver seat 7 in FIG. 3, the armrest 21 is provided with a work implement elevating lever 21a and a work implement elevating lever so that the operator can operate it with his / her fingers without discomfort. The operation tools for work travel such as the switch 21b and the travel shift switches 21c and 21d are configured to be embedded in the position closer to the front end without protruding from the outer shape surface of the armrest.

  More specifically, as shown in FIG. 4, an enlarged side view of the main part of the armrest 21 is used for the work implement lift switch 21 b, so that the two-select push button type seesaw switch is embedded in the groove 21 e in the forwardly lowered posture. The working machine is moved up and down to the upper and lower end positions of the set lifting range by a two-selection indicating means in which a lowering operation instructing section D and a lifting operation instructing section U are arranged in the front and rear positions. It is an operating tool.

  The operation of the work implement lifting / lowering switch 21b is lowered and held at the set lower end position by the one-push operation of the lowering movement instruction unit D on the front side, and is set to the upper end position set by the one-push operation of the rearward movement operation instruction unit U. Hold up. The ascending position is set separately with the adjustment dial, and the descending position is set at the height corresponding to the slide operation set and adjusted with the work implement elevating lever 21a. The machine is raised and lowered.

  The work implement lifting / lowering switch 21b is configured such that when the front side of the work implement lift switch 21b is pushed down, the work implement is lowered, so that the length of the armrest 21 itself can be reduced as much as possible, and the forward protrusion can be reduced. Further, it is possible to prevent erroneous operation by configuring the top of the work implement lifting switch 21b to be below the height of a partition 21s described later.

  Furthermore, the length of the armrest itself is shortened by setting the travel shift switches 21c and 21d so that the position of the travel shift switches 21c and 21d is near the rear end of the R-shaped portion of the armrest for forming the front work implement lifting operation lever. In addition, since the speed increasing / decreasing operation can be performed only by moving the finger slightly backward from the vicinity of the work equipment lifting / lowering operation portion that is a normal operation target, the operability can be improved. In addition, the travel shift switches 21c and 21d are arranged behind the lifting / lowering operation unit arranged side by side with the work implement lifting / lowering operation lever, whereby the length of the armrest itself can be shortened.

  The pair of travel shift switches 21c and 21d are formed by a work implement lift lever 21a and a work implement lift switch 21b in order to ensure operability when shifting the travel speed of the machine body according to the work load in work travel. It arrange | positions on the armrest 21 in the back of a working machine raising / lowering operation part. Specifically, the travel shift switches 21c and 21d are arranged in the outer surface of the armrest 21 by being embedded in a groove 21f formed to be slightly inclined inward of the driver's seat 7 in the upper surface area of the armrest 21, and each of them is 1 Each time the switch is pressed, the main gear shift stage is changed by one stage to shift up and down, and the low speed is 8 speeds, the medium speed is 8 speeds, the high speed is 8 speeds, and the road speed is 4 speeds (high speed 8 speeds, 4 speeds) Adjust the speed within the range.

  The travel shift switches 21c and 21d can be prevented from being erroneously operated due to their embedded configuration. In addition, since the shift switch can be easily operated with the thumb by arranging the armrest 21 closer to the upper surface, the armrest having a limited length can be configured in a compact manner, and the inner surface of the armrest 21 can be arranged. Compared with the case, it is not necessary to release the hand during operation to search for the switch, and the operability can be ensured.

  The work implement elevating lever 21a is an operating tool for setting and adjusting the lower end position of the elevating range of the work implement, and the configuration thereof is as shown in FIG. 5 showing a side view of the internal configuration with the outer cover of the armrest 21 removed. A slide knob 21p for sliding operation is provided at an end portion at a position adjacent to the switch 21b and is supported by a support shaft 21q. By providing a sensor 21r such as a rotary potentiometer for detecting the rotation angle of the arc-shaped range S in the front-rear direction, the armrest 21 is provided with a sensor 21r on the rear side from the “low position” L on the front side of the operation range S. The height of the work implement is adjustable up to “high position” H.

  Further, the work implement elevating lever 21a has a slide knob 21p arranged in the outer surface of the armrest 21 so as to be embedded in the groove 21t, and a gentle outer shape of the armrest 21 between the adjacent work implement elevating switch 21b and the groove 21e. They are separated by a partition 21s that forms a surface. By placing a hand on the partition 21s, it is possible to distinguish the two systems of operating tools without requiring line-of-sight movement.

  Further, the height of the top of the slide knob 21p is substantially the same as the height of the partition 21s, and the difference in the shape and height of the partition 21s is substantially the same in the entire range S of the slide operation. In addition, the partition 21s serves as a guide during operation, and operability can be ensured. Moreover, since the upper surface of the armrest 21 can be formed in an arcuate shape by configuring the work implement elevating lever 21a with a rotating structure, the forward bulge can be reduced.

  With the above configuration, when changing the height position of the work implement, two types of instruction means can be properly used depending on the situation, both of which are arranged on the upper surface of the front end portion of the armrest. Because it is within the operator's field of view and can be moved up and down by quick selection at any time without requiring groping or line-of-sight switching, it is accompanied by the lifting and lowering of the work machine required for each turn of the machine during reciprocating work travel. Efficient work traveling is possible without disturbing the flow of a series of field work.

  In addition, by aligning the longitudinal direction of the two systems of instruction means by the slide operation and the two-select push button operation, it can be arranged in a compact manner within the width of the armrest. Since the relationship with the operation direction of the machine is common, it is possible to give a smooth ascending / descending instruction by recognizing the common ascending / descending operation even by switching the operation mode.

  In addition, regarding the upper surface of the armrest 21, by placing the work implement lifting lever 21a on the outside and the work implement raising / lowering switch 21b on the inside, respectively, it causes a sense of incongruity due to a cramped slide stroke operation or push button operation when arranged on the reverse side. And can be easily operated with fingers.

F3 / Supporting Base Next, the operation panel device 22 will be described.
As shown in an enlarged perspective view of FIG. 3, the operation panel device 22 has an operation unit such as a work machine, a traveling system, and an engine rotational speed arranged on one side of the driver seat 7 in order to improve operability. ) And are arranged on one side of the driver's seat 7 by supporting the operation tools 23a to 25e for controlling and operating the traveling system and work system devices constituting the tractor. The support base 22t is arranged centrally.

  The support base 22t is composed of a flat shape adjacent to the driver's seat 7, a middle step portion 24 that rises steeply from the back side, and an upper step portion 25 that gently leans from the upper end to the back height and recedes, respectively. Place the operation tool on That is, the support base 22t that covers the upper surface with an integral lever guide is formed, and a flat portion is formed by the base step portion 23 near the driver's seat 7, and is slightly inclined far from the seat on the back side from this flat portion. In addition, an inclined portion is provided by the upper step portion 25 at a position higher than the flat portion, and the arrangement surface is connected so that the inclined portion and the flat portion are connected by the inclined surface of the intermediate step portion 24 having a tight inclination angle from the inclined portion. It is configured, and operation tools such as operation switches and levers are arranged on all surfaces.

  In particular, the base step portion 23 and the middle step portion 24 that are close to the driver's seat 7 are provided with electric operation tools such as switches, and the upper step portion 25 that is relatively far away is provided with an operation tool using levers that perform a stroke operation. Thus, centralized arrangement is possible while ensuring operability according to the operation tool.

F10 / base step 23
Specifically, as shown in FIG. 10, the base step portion 23 directly performs transmission and cut-off of transmissions such as a PTO on / off switch 23 a, a PTO manual automatic switch 23 b, and a differential lock switch 23 c. Arrange the operation switch. Unlike the mode setting switch, which is relatively complicated to operate, these switches are simple to operate, and can be easily operated even in a relatively cramped posture with the arm bent.

F11 / middle section 24
As shown in FIG. 11, a panel surface sketch is shown in the middle section 24. Two engine speed storage switches 24a, 24b, a draft ratio adjustment dial 24c, a raising adjustment dial 24d, a tilt adjustment dial 24e, a 4WD changeover switch 24f, a horizontal A cylinder manual up / down switch 24g and the like are arranged.

Upper section 25
On the upper stage 25 of the support base 22t, there are disposed a throttle lever 25a, a sub-transmission lever 25b, sub-control levers 25c and 25d for taking out hydraulic pressure supplied to the working machine, an optional sub-control lever 25e, and the like.

  The auxiliary transmission lever 25b is provided with positions of low speed, medium speed, high speed, and road traveling speed by XY operation levers in the front and rear, right and left directions. For each position, it covers the shift band of 8 speeds at low speed, 8 speeds at medium speed, 8 speeds at high speed, and 4 speeds on the road (upper 4 speeds of 8 speeds).

  In the operation panel device 22 having the above-described configuration, the operation tool can be arranged within the range of the width of the base step portion 23 and the upper step portion 25, and the operation tool is arranged in the middle step portion 24 according to the standing height dimension. Therefore, various device operations can be performed in a compact manner with a large number of operating tools without impairing the operability of the operating tools on one side of the driver seat.

  Further, the upper portion 25 is provided with operation tools 25a to 25e having a lever for tilting operation, and is disposed relatively far from the driver's seat at the position where the arm is extended, so that a lever type requiring a large stroke operation is required. The operability of the operation tool can be ensured. Therefore, the operation tool in the upper stage is provided with a mechanical link mechanism that transmits the stroke operation by lever operation, and is configured to transmit to the actuator and the final operating part, thereby setting a large stroke corresponding to the on / off operation feeling. can do.

F6 / Sub-transmission link A sub-transmission lever link mechanism will be described as a specific example of the above configuration.
As shown in FIG. 6, the auxiliary transmission lever 25b includes an XY arm mechanism 27 that operates in the front-rear and left-right directions. The other end of the two push-pull cables 27a and 27b to be connected is connected to the transmission case. It connects to the bracket 28 on the 5th side.

F7 / XY detection unit The XY arm mechanism 27 includes a first oscillating body 27c for detecting the X-direction stroke of the front / rear shift operation of the auxiliary transmission lever 25b and the auxiliary transmission lever 25b, as shown in an enlarged perspective view in FIG. And a second oscillating body 27d that supports the shaft and detects the Y-direction stroke of the left and right sliding operation, and separates the X-direction stroke and the Y-direction stroke through these oscillating bodies 27c and 27d, respectively. 27a and 27b are provided.

  These two push-pull cables 27a and 27b constitute a link by their respective holder portions being completely fixed to the body frame side regardless of the movement of the auxiliary transmission lever 25b. In this case, by providing the first rocking body 27c with guide members 27g and 27g made of a round bar in contact with the auxiliary transmission lever 25b, it is possible to smoothly follow the XY direction stroke operation.

  In this way, the arm 5b coming out of the transmission case 5 is moved in two directions using the two push-pull cables 27a and 27b as links, and the movement in the shift direction (front-rear direction) is transmitted in the operating lever mechanism of the tractor that performs shifting. The holder portions of both the cable 27a and the cable 27b for transmitting the movement in the sliding direction (left-right direction) are completely fixed regardless of the movement of the lever.

  In the conventional configuration, either one of the holders follows the movement of the lever 25b, so that the cable itself moves when the lever is operated, and the operation feeling is deteriorated. Since the lever 25b and the cable 27a are connected, the cable 27a moves following the movement of the lever 25b because the holder of each cable 27a is completely fixed regardless of the position of the lever 25b. And the feeling of operation is improved.

F8 / Bracket part The bracket 28 on the mission case 5 side receives the two push-pull cables 27a and 27b, and transmits the transmission converted into the turning operation and the advancing / retreating operation of the shift rod 5b for switching the transmission gear ratio of the transmission transmission unit 5a. A mechanism and a check mechanism that regulates its operating range are integrally formed.

  That is, as shown in the enlarged side view of FIG. 8, the push-pull cable 27a that receives the X-direction stroke rotates the shift rod 5b around its axis by connecting to the arm 5c integrated with the shift rod 5b. The push-pull cable 27b that receives the stroke in the Y direction is converted into the axial movement of the shift rod 5b via the L-shaped link 28b and is connected to the arc-shaped arm 5d integrated with the shift rod 5b. The rod 5b is advanced and retracted in the axial direction.

  The bracket 28 that constitutes the transmission mechanism facilitates the routing of the push-pull cable in the front-rear direction by providing the L-shaped link 28b, thereby enabling a natural and efficient layout. Further, since the arc-shaped arm 5d extends along a concentric circle with the shift rod 5b as the center, the contact point position of the L-shaped link 28b is not dependent on the rotation angle of the shift rod 5b, and the arm ratio is ensured by a constant radial distance. can do.

  As described above, since all the parts related to the speed change link are assembled in a single bracket, the assembling accuracy is improved, and variations can be minimized. In addition, since the arm ratio of the L-shaped link 28b is maintained regardless of the rotational angle position of the shift rod 5b, it is possible to ensure the slide rod 5b in the sliding direction in proportion to the movement of the auxiliary transmission lever 25b. it can.

  With respect to the check mechanism, the arm 5c is provided with a pin 5e, and the check member 28a with a hole 28c is erected on the bracket 28 side, so that the left and right slide positions at a predetermined front and rear shift position of the sub-shift lever 25b. It constitutes the restraining means that restrains with. That is, when the shift rod 5b is slid by the push-pull cable 27b that transmits the Y-direction stroke at a position where the arm 5c is swung to a predetermined angle by the push-pull cable 27a that transmits the X-direction stroke, the check on the bracket 28 side is suppressed. The restraining means is configured in a positional relationship that fits into the hole 28c of the member 28a and restrains the swinging motion. By this checking means, it is possible to separately set a “road running” position in the “high speed” position and check the direct shift to the neutral position.

  In this way, the bracket is rigidly fixed to the transmission case, and the cable that transmits the movement of the shift lever is directly held, so by providing a direct check mechanism on this bracket, dimensional errors and variations can be avoided. It can be suppressed to the minimum limit, and a reliable check is possible.

  In addition, the bracket 28 having the above-described configuration protrudes from the side surface of the transmission case 5, and the layout of the transmission gear on the transmission case side is facilitated and the rigidity is secured by assembling the cable holding and shifting check means, the shift sensor, and the like. Can do.

F9 / Brake Next, the brake link configuration will be described.
The left and right brake pedals 11c and 11d are connected to hydraulic cylinders 32a and 32b, which are brake actuators, via left and right relay links 31a and 31b, respectively, and from the parking brake 7b via a parking lever relay link 33 which is a single member. In the brake transmission mechanism configured to be connected to the right and left relay links 31a and 31b, the pedal when the actuator of the auto brake mechanism is operated by restricting the movement of the link arm of the parking brake using a bolt. Construct side stopper. That is, a return regulating stopper 34 is provided on the parking lever relay link 33. By this stopper 34, when the brake is operated by the shortening operation of the left and right hydraulic cylinders 32a and 32b, it is possible to restrict the front rod from moving to the cylinder side.

  In this way, by adjusting the lock bolt for the stopper 34 at one location that restricts the movement of the link arm of the parking brake, the pedal-side stopper mechanism is established, thereby reducing the man-hours. Further, during the adjustment, it is possible to easily adjust by putting a hand from the rear of the tractor by standing work. Therefore, when the stopper bolt (B) is provided on the brake arm of each of the left and right relay links 31a and 31b as in the prior art, separate adjustment man-hours for the left and right are not required, and it is necessary to sink from under the tractor for adjustment work. Troublesome work can be improved.

It is a body side view of an agricultural tractor. It is a principal part top view in a cabin. It is a principal part perspective view of a driver's seat. It is an enlarged side view of an armrest. It is an internal structure (outside) enlarged side view of an armrest. It is a connection system diagram of the link mechanism of an auxiliary gearshift lever. It is an expansion perspective view of an XY arm mechanism. It is an enlarged front view of a bracket. It is a link block diagram of a brake. It is a mounting surface sketch of a base step part. It is a panel surface sketch of a middle part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Agricultural tractor 2 Front wheel 3 Rear wheel 21 Armrest 21a Work machine raising / lowering lever 21b Work machine raising / lowering switch 21c Traveling speed change switch 21e Groove 21f Groove 21q Spindle 21s Partition 21t Groove D Lowering operation instruction part S Arc-shaped range U Ascending operation instruction part

Claims (2)

An operating tool for raising and lowering the work machine connected to the rear part of the tractor is provided on the armrest (21) supported on the side of the driver seat (7),
The operating tool comprises two systems of instruction means (21a, 21b) for instructing to change the height position of the work implement, and these are arranged on the upper surface of the front end portion of the armrest (21). Machine lifting operation device.   The operating tool is slidable indicating means for instructing to change the height position of the work implement within a predetermined range from a low position to a high position in response to a sliding operation in the longitudinal stroke range (S) of the armrest (21). (21a), and a two-choice type in which a lowering operation instructing unit (D) and an ascending operation instructing unit (U) for instructing an ascending / descending operation of the work implement by a two-selection push button operation are arranged in the front-rear direction position of the armrest (21) 2. The work implement lifting / lowering operation device according to claim 1, wherein the work implement lifting / lowering operation device comprises an instruction means (21b).

Images