JP2009262668A - Continuously variable transmission mechanism operating device of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To share a single shift pedal link unit in a plurality of types, in a working vehicle provided with a continuously variable transmission mechanism. <P>SOLUTION: A floor F is disposed on an upper side of a transmission case 11 internally fitted with the continuously variable transmission mechanism 8. A forward pedal 1a and a backward pedal 1b for operating the continuously variable transmission mechanism 8 are journaled in a juxtaposed state by a shaft in a lateral direction on a bracket 12 mounted in a lateral one side lower face of the floor F. Stepping operation parts of the forward pedal 1a and the backward pedal 1b are arranged to be projected to an upper side of the floor F, and offset from the bracket 12 toward the lateral outside in a plane view. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a continuously variable transmission operating device for a work vehicle.

In a tractor shift operation configuration configured to operate a hydraulic continuously variable transmission by pedal operation, an operation arm swinged by a shift pedal, a shift arm provided for a shift operation shaft of the hydraulic continuously variable transmission, Are linked with the connecting rod, and a damper is installed between the connecting point of the transmission arm and the connecting rod and the fixed part on the fuselage side, reducing the number of components for vibration isolation and reducing the number of parts assembly man-hours. What has been made is known.
JP 2005-233260 A

  In the configuration as described above, the shifting pedal for operating the hydraulic continuously variable transmission is directly supported on the right side of the foot of the driving unit in the tractor machine. When the sizes are different, there is a problem in that a shift pedal link unit having the same configuration cannot be used as a common part.

  In view of the above, the present invention is intended to solve such problems and allow the same shift pedal link unit to be shared by a plurality of types.

  According to the first aspect of the present invention, a floor (F) is disposed on the upper side of the transmission case (11) in which the continuously variable transmission mechanism (8) is housed, and is attached to the lower surface of one side of the floor (F). A forward pedal (1a) and a reverse pedal (1b) for operating the continuously variable transmission mechanism (8) are pivotally supported on a bracket (12) in a laterally parallel state with a horizontal axis, and the forward pedal (1a) And a work vehicle characterized in that the stepping operation portion of the reverse pedal (1b) is disposed so as to protrude above the floor (F) and is offset to the left and right outer sides in plan view than the bracket (12). The continuously variable transmission mechanism operating device.

  According to the above configuration, when the forward pedal (1a) and the backward pedal (1b) arranged side by side on the left and right sides of the floor (F) are operated to rotate about the left and right axis, the continuously variable transmission mechanism (8) is shifted to the forward or reverse side.

  In the invention of claim 2, the bracket (12) supported near the center of the floor (F) near the transmission case (11) has the forward pedal (1a), the backward pedal (1b), the forward rod ( 2. A continuously variable transmission mechanism operation of a work vehicle according to claim 1, wherein a pedal link unit comprising 2a), a reverse rod (2b), front and rear crank levers (3a, 3b) and a pedal sensor (3s) is attached. A device.

  According to the above configuration, the pedal link unit including the forward pedal (1a), the reverse pedal (1b), the forward rod (2a), the reverse rod (2b), the front and rear crank levers (3a, 3b) and the pedal sensor (3s). Is firmly supported by the bracket (12) supported near the center of the floor (F) near the transmission case (11).

  According to the first aspect of the present invention, a forward pedal (1a) and a reverse pedal (8) for operating the continuously variable transmission mechanism (8) are provided on the floor (F) attached to the transmission case (11) via a bracket (12). By supporting 1b), the forward pedal (1a), the backward pedal (1b), and the bracket 12 can be configured in a single configuration even when the floor (F) is different in height from the mission case (11). Therefore, it is possible to reduce the number of parts and rationalize production while reducing costs.

  In addition to the above-mentioned effect of the invention of claim 1, the invention of claim 2 includes a forward pedal (1a), a reverse pedal (1b), a forward rod (2a), a reverse rod (2b), a front and rear crank lever (3a). 3b) and the pedal link unit comprising the pedal sensor (3s) can be firmly supported.

A concretely configured embodiment of the present invention will be described below with reference to the drawings.
A tractor, which is an example of a continuously variable work vehicle, is equipped with a transmission 1 having a continuously variable transmission mechanism installed at a floor position of a control unit, and a forward pedal 1a and a backward pedal 1b at lateral positions thereof. Deploy. The transmission 1 shifts the driving power transmitted from the engine steplessly and transmits it to the traveling wheels to adjust the forward and backward traveling vehicle speed. The transmission 1 is controlled according to each pedal depression operation. A transmission speed control device is provided.

  FIG. 1A is a system configuration diagram of a transmission speed control device for a continuously variable work vehicle. This transmission speed control system adjusts the speed of the continuously variable transmission mechanism 8 so as to correspond to the input side for detecting the stepping operation of the forward pedal 1a and the reverse pedal 1b disposed so as to be capable of stepping, and the pedal operation. It comprises an output side that adjusts and drives the unit to the target speed position, and a controller 5 that performs device control processing on the output side based on the detection signal on the input side.

  On the input side, the forward pedal 1a and the backward pedal 1b, the forward rod 2a and the backward rod 2b connected from the respective pedals 1a and 1b, and the forward and backward movements of the forward rod 2a and the backward rod 2b are rotated in common. It is composed of crank levers 3a and 3b that convert to pivoting motions in different directions around the shaft 3, and a pedal sensor 3s that detects the pedal position based on the rotation angle of the crank levers 3a and 3b. Thus, a vehicle speed sensor 4a, a throttle sensor 4b, an oil temperature sensor 4c, and the like are provided, and respective detection signals are input to the digital controller (transmission speed control unit) 5.

  On the output side, a hydraulic cylinder 6a that is an actuator that expands and contracts by the electromagnetic hydraulic control valve 6b, a crank lever 7 that rotates around the support shaft 7a in response to the expansion and contraction operation, and a rotation angle of the crank lever 7 The trunnion sensor 7s for detecting the rotational position of the speed adjusting unit by the trunnion shaft 8a and the continuously variable transmission mechanism 8 connected from the crank lever 7 via the rod 7b. The continuously variable transmission mechanism 8 is a hydrostatic forward / reverse continuously variable transmission mechanism, abbreviated as HST, and the work speed is adjusted by the rotation angle of the trunnion shaft 8a, which is the speed adjusting unit. Adjusts the forward / backward travel speed and the running speed continuously.

  In this case, as for the adjustment speed of the continuously variable transmission mechanism 8, as shown in FIG. 1 (b), if necessary, the crank lever can be replaced with an electric motor 6c instead of the hydraulic cylinder 6a. 7 can be constituted by an electric actuator for gear driving.

  Next, a specific configuration will be described. As for the input side of the controller 5, as shown in FIG. 2, the forward pedal 1a, the backward pedal 1b, the forward rod 2a, the backward rod 2b, the rotating shaft 3, the crank levers 3a, 3b, and The pedal sensor 3s is configured as a single pedal link unit so that it can be retrofitted to the aircraft. As shown in the side view of FIG. 3, the internal configuration of the pedal link unit includes a continuously variable transmission 8 and a side portion of the transmission 1 that adjusts the speed of a work vehicle such as a tractor. The forward pedal 1a and the reverse pedal 1b are arranged close to each other in parallel by a common supporting shaft 1c, and a crank lever is provided at the rear end of the forward rod 2a and the reverse rod 2b with adjusters connected from the respective pedals 1a and 1b. 3a and 3b are connected, and these crank levers 3a and 3b convert the forward and backward movements of the forward rod 2a and the backward rod 2b around the common rotational shaft 3 into rotational movements in different directions, and are integrally provided. A pedal sensor 3s is arranged at 3e, and its swing angle is detected. Since the pedals 1a, 1b, the pedal sensor 3s, the forward rod 2a, and the reverse rod 2b are mounted on the floor F that is mounted and supported by the transmission 1, the vibration from the transmission 1, that is, the machine body The vibration from the side is suppressed, and the detection accuracy of the pedal sensor 3s can be improved.

  The input-side unit, which is the pedal link unit, is operated in common through the corresponding forward rod 2a, reverse rod 2b, and crank levers 3a, 3b when one of the forward pedal 1a and the reverse pedal 1b is depressed. The pedal sensor 3s is rotated around the moving shaft 3, and the pedal sensor 3s is moved corresponding to the pedal pedaling operation via the action arm 3e to detect the rotation angle. Further, when the other pedal is depressed, the corresponding crank levers 3a and 3b are rotated in the reverse direction, and as a result, the rotation angle in the reverse direction is detected by the pedal sensor 3s.

  On the output side, as shown in FIG. 4, a hydraulic cylinder 6a is arranged along the side surface of the transmission 1 and a crank lever 7 connected to the piston rod is pivotally supported by a support shaft 7a. A trunnion sensor 7s for detecting a swing angle of the trunnion 7 is disposed, and a trunnion arm 8b, which is a crank lever integrated with the trunnion shaft 8a of the transmission 1 at the front end of a rod 7b that pivotally extends from the crank lever 7. Are connected to the side surface of the transmission 1 and arranged so as to line up with the input-side pedal link unit. Further, a cam 8c is formed on the trunnion arm 8b, and a neutral arm 8e that acts on the cam 8c by a neutral spring 8d is attached so as to return the trunnion arm 8b to the neutral position.

  With the configuration on the output side, when the piston rod of the hydraulic cylinder 6a that is hydraulically controlled moves forward and backward, the trunnion shaft 8a that is integral with the trunnion arm 8b is rotated via the crank lever 7 and the rod 7b, so that the transmission 1 The swash plate of the variable hydraulic motor of the continuously variable transmission 8 is rotated to adjust the transmission speed, and the expansion / contraction control of the hydraulic cylinder 6a is performed based on the signal of the trunnion sensor 7s that detects the adjustment position of the trunnion shaft 8a. By doing so, the required speed can be adjusted. Further, when the control hydraulic pressure of the hydraulic cylinder 6a is released, the trunnion arm 8b is returned to a predetermined neutral position by the cam 8c that receives the acting force of the neutral arm 8e, and the vehicle travel is stopped.

  When the pedal sensor 3s detects the stepping operation of the forward pedal 1a and the backward pedal 1b, the transmission speed control unit 5 determines the target speed position of the trunnion shaft 8a according to the signal and the trunnion shaft 8a is the target. The hydraulic cylinder 6a is controlled by the electromagnetic hydraulic control valve 6b based on the signal from the trunnion sensor 7s until it becomes equal to the speed position. As a result, the traveling speed of the aircraft can be adjusted according to the pedal operation.

  The transmission speed control unit 5 detects the amount of stepping motion of the forward pedal 1a and the backward pedal 1b via the common pedal sensor 3s by the configuration on the detection side. The transmission speed control device for adjusting the vehicle speed in a stepless manner according to the amount of depression of the pedals 1a and 1b can reduce the manufacturing cost and maintenance load while ensuring common operability with a simple configuration. it can.

Next, the support structure of the forward pedal 1a and the backward pedal 1b shown in FIGS. 5 to 9 will be described.
A floor F is disposed on the upper side of the transmission case 11, the handle post 13 is raised from the center of the front side of the floor F, the steering handle 14 is attached to the upper end of the handle post 13, and the upper surface of the handle post 13 An operation panel 15 is provided on the rear side, and a seat 16 is provided on the rear side of the floor F.

  Further, when the floor F is disposed on the upper side of the mission case 11, the left and right center portions of the mission case 11 are formed as projecting portions 11 a projecting in the front-rear direction, and floor mounting frames are provided on both left and right sides of the mission case 11. The left and right floors Fa and Fb are attached via 19. The left and right fenders 17a and 17b are attached to the rear sides of the left and right floors Fa and Fb, and the left and right side steps 18a and 18b are attached to the left and right sides of the front side of the left and right floors Fa and Fb.

  Also, a pedal support bracket 12 is fixed to the lower surface of the right and left center portion of the right floor Fb, and the left and right pivot shaft 3 is attached to the bracket 12 at a lower portion of the right floor Fb and to the right side of the mission case 11. It arrange | positions so that it may be located in a side, and the forward pedal 1a and the backward pedal 1b are pivotally supported by this rotation axis | shaft 3 in the left-right parallel form. Then, a stepping portion is provided at the upper end extension portion of the forward pedal 1a and the backward pedal 1b so as to protrude above the right floor Fb, and the stepping portion is offset to the right side of the bracket 12. .

  According to the above configuration, by supporting the forward pedal 1a and the backward pedal 1b via the bracket 12 on the right floor Fb, the shape of the mission case 11 and the floor F differs depending on the type of the tractor. Even when the heights between the Fb are different, the forward pedal 1a, the backward pedal 1b, and the bracket 12 can be manufactured with a single-piece pedal link unit, thereby reducing the number of parts and reducing the cost. it can.

  Further, when the forward pedal 1a and the backward pedal 1b are disposed on the right side of the transmission case 11, the right side step 18b and the transmission case 11 are located between the right side step 18b and the right side step 18b. It is necessary to reinforce the side step 18b. However, the right floor Fb close to the center portion of the mission 11 is strongly supported by the upper center portion of the mission case 11, so that there is no need for reinforcement, and the support structure of the forward pedal 1a and the backward pedal 1b is strengthened. Cost can be reduced.

  Further, the front end of the forward rod 2a and the reverse rod 2b are pivotally connected to the rear ends of the forward pedal 1a and the backward pedal 1b, and the rear end thereof is extended rearward, so that the forward movement toward the inner side of the body. A neutral return spring 21 is attached to the pedal 1a side, and a reverse rod 2b nearer to the outer side of the machine body is disposed at a lower position on the left and right outer sides away from the right floor Fb.

  According to the above configuration, the forward pedal 1a closer to the inner side of the fuselage is attached with the spring 21 for returning to the neutral position, and the reverse rod 2b closer to the outer side of the fuselage is disposed at the lower side farther from the floor F and at the left and right outer side parts. The position of the pedal 2b can be adjusted easily without the spring 21 getting in the way.

  Further, a mounting bracket 20 is attached to the right front side portion of the transmission case 11, and the electromagnetic pressure is applied to the mounting bracket 20 so as to be positioned below the right floor Fb and above the lower surface of the transmission case 11. A control valve 6b and a hydraulic cylinder 6a that is expanded and contracted by an electromagnetic hydraulic control valve 6b are attached. The mount bracket 20 supports the front side portion of the right floor Fb.

  According to the above configuration, the heavy-duty hydraulic cylinder 6a and the electromagnetic hydraulic control valve 6b are supported on the strong mounting bracket 20 supported on the transmission case 11, thereby reinforcing the electromagnetic hydraulic control valve 6b. Can be eliminated, and a compact configuration can be obtained. Further, when the hydraulic cylinder 6a is manually operated, the hydraulic cylinder 6a and the electromagnetic hydraulic control valve 6b are close to each other. Therefore, the solenoid (not shown) is pressed to operate the electromagnetic hydraulic control valve 6b to operate the hydraulic cylinder 6a. This makes it easy to perform maintenance work. In addition, since the electromagnetic hydraulic control valve 6b and the hydraulic cylinder 6a are located above the lower surface of the mission case 11, it is possible to prevent hitting an obstacle and enhance durability.

  Further, an electromagnetic hydraulic control valve 6b and a hydraulic cylinder 6a are disposed below the right floor Fb on the right side of the mission case 11, and an electromagnetic wave is disposed below the left floor Fa on the left side of the mission case 11. A controller 5 for controlling the hydraulic control valve 6b is provided.

  According to the above configuration, by disposing the hydraulic component and the controller 5 for control separately on the left and right sides of the mission case 11, it is possible to prevent the hydraulic pressure from being scattered to the controller 5 and to improve the durability even when the hydraulic component is in trouble. . Further, by arranging the electromagnetic hydraulic control valve 6b, the hydraulic cylinder 6a and the controller 5 below the left and right floors Fa and Fb, these parts can be retrofitted after completion of the tractor, and the type can be easily changed. Become.

  Further, when the pedal sensor 3s and the hydraulic cylinder sensor 6s are disposed below the right floor Fb on the right side of the mission case 11, the forward pedal 1a, the backward pedal 1b, and the hydraulic cylinder 6a are disposed behind the hydraulic pedal 6a. It is arranged near the lower side of the right floor Fb, and the pedal sensor 3s and the hydraulic cylinder sensor 6s are arranged close to each other. According to the said structure, even if water jumps up from the front wheels 22 and 22, it is hard to be applied to a sensor, the contact with the obstruction of a sensor can be avoided, and the misdetection of a sensor can be prevented.

  Also, a pedal support bracket 12 is detachably fixed to the bottom surface of the right and left central portions of the right floor Fb with bolts and nuts, and the forward pedal 1a and the backward pedal 1b are pivotally supported on the bracket 12 in a laterally parallel state. Yes.

  According to the said structure, the mounting position of the forward pedal 1a and the backward pedal 1b can be easily changed in the front-back direction by changing the bolt hole for bracket 12 attachment in the right floor Fb in the front-back direction. The configuration of the pedal link unit can be shared by a plurality of models, and the cost can be reduced while reducing the number of parts.

  Further, the left and right center part of the mission case 11 is formed as a projecting part 11a projecting in the front-rear direction, and the floor mounting frame body 19 for mounting the floor F is made up of left and right front-rear direction mounting frame bodies 19f, 19f along the front-rear direction. The left and right front / rear direction mounting frame bodies 19f and 19f are formed in an L shape in side view by left and right vertical direction mounting frame bodies 19r and 19r extending downward from the rear end portions. The front end portions of the left and right front / rear mounting frames 19f and 19f are attached to the left and right upper portions of the transmission case 11 with bolts and nuts via left and right mount brackets 20 and 20, respectively. The left and right front / rear mounting frame 19f is attached to the center of the transmission case 11 with bolts and nuts, and the left and right vertical mounting frames 19r and 19r are attached to the rear of the transmission case 11 with bolts and nuts. Yes.

  Left and right floors Fa and Fb are attached to the upper surfaces of the left and right front and rear direction attachment frames 19f and 19f. The electromagnetic hydraulic control valve 6b and the hydraulic cylinder 6a are attached so as to be positioned below the right floor Fb via a mount bracket 19a attached to the lower surface near the center of the right floor Fb. Also, a pedal link unit comprising a forward pedal 1a, a backward pedal 1b, a forward rod 2a, a backward rod 2b, and crank levers 3a and 3b is attached to the bracket 12 attached to the lower portion of the right front / rear direction mounting frame 19f. Is attached. A controller 5 for controlling the electromagnetic hydraulic control valve 6b is disposed below the left floor Fa on the left side of the mission case 11.

According to the above-described configuration, the related parts can be concentrated in a compact manner by concentrating and arranging the related parts on the left and right sides of the mission case 11, and the assembling work is facilitated.
Further, the continuously variable transmission mechanism 8, the forward rod 2a and the backward rod 2b linked to the forward pedal 1a and the backward pedal 1b, and the forward and backward movements of the forward rod 2a and the backward rod 2b are used as a common rotating shaft 3. A pedal link unit made up of crank levers 3a and 3b, which are converted into rotational movements in different directions around each other, is arranged on the right side of the transmission case 11, and the forward pedal 1a and the backward pedal 1b are stepless in plan view. The transmission mechanism 8 is arranged near the right outer side.

  According to the said structure, the height of these members can be made low, and it can attach easily also to several types with high and low between the mission case 11 and the floor F, and can aim at common use of components.

  Further, the right floor Fb is attached to the mission case 11, and the forward pedal 1a, the backward pedal 1b, which are the pedal link units, and the forward rod are connected via a bracket 12 attached to the lower surface of the right floor Fb near the center. 2a, a reverse rod 2b, and crank levers 3a, 3b for converting the forward and backward movements of the forward rod 2a and the reverse rod 2b to rotation operations in different directions around a common rotation shaft 3 are attached.

  According to the above configuration, the pedal link unit can be attached to a plurality of types without changing the configuration of the mission case 11. Further, these members can be assembled without removing the right floor Fb, and the recombination work becomes easy.

  Further, the forward rod 2a and the reverse rod 2b constituting the pedal link unit, and a crank lever for converting the forward and backward movements of the forward rod 2a and the backward rod 2b into rotational motions in different directions around the common rotational shaft 3. 3a, 3b and a pedal sensor 3s for detecting the pedal depression position based on the rotation angle of the crank levers 3a, 3b are arranged on the inner side of the front wheel 22 and the rear wheel 23 in a plan view. According to the said structure, even if water and mud are splashed up from the front wheel 22 and the rear wheel 23, it is hard to start, durability can be improved and the false detection of the pedal sensor 3s can be prevented.

(A) System configuration diagram of transmission speed control device (b) System configuration diagram showing another embodiment of transmission speed control device Perspective view of transmission speed control device Mission case side view Mission case side view Overall side view of work vehicle Overall plan view of work vehicle Side view of the work vehicle mission case Plan view of the middle part in the front-rear direction of the work vehicle Perspective view of transmission speed control device

Explanation of symbols

1a forward pedal 1b reverse pedal 2a forward rod 2b reverse rod 3a front crank lever 3b rear crank lever 3s pedal sensor 8 continuously variable transmission mechanism 11 mission case 12 bracket F floor

Claims (2)

  A floor (F) is disposed on the upper side of the transmission case (11) in which the continuously variable transmission mechanism (8) is housed, and the bracket (12) attached to the lower surface on one side of the left and right sides of the floor (F). The forward pedal (1a) and the reverse pedal (1b) for operating the step shifting mechanism (8) are pivotally supported by the left and right shafts in a side-by-side arrangement, and the forward pedal (1a) and the reverse pedal (1b) are stepped on. A continuously variable transmission mechanism operating device for a work vehicle, characterized in that an operating portion is disposed so as to protrude above the floor (F) and is offset to the left and right outer sides in plan view than the bracket (12).   The forward pedal (1a), the reverse pedal (1b), the forward rod (2a), the reverse rod (2b) are mounted on the bracket (12) supported near the center of the floor (F) near the transmission case (11). 2. The continuously variable transmission mechanism operating device for a work vehicle according to claim 1, further comprising a pedal link unit comprising a front and rear crank lever (3a, 3b) and a pedal sensor (3s).

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