JP2013032081A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working vehicle that has good maintainability and reduces transmission of vibration from a vibration generating source to an operation lever.SOLUTION: The working vehicle includes: an engine 3; a vehicle body frame 22 to which the engine 3 is fixed; a HST (hydraulic stepless transmission) operation lever 30 that is attached to the vehicle body frame 22 and supported for operating the vehicle; and a grommet 43 between the HST operation lever 30 and the vehicle body frame 22. The grommet 43 suppresses the vibration caused by power for travelling from the engine 3 and a hydraulic stepless transmission 4.

Description

  The present invention relates to a working vehicle that includes an engine, a vehicle body frame on which the engine is fixed, and an operation lever that is attached to and supported by the vehicle body frame.

  Conventionally, a working vehicle such as a tractor is provided with an operation lever for driving operation, but vibration is transmitted from a vibration generating source such as an engine to the operation lever, and the driver is uncomfortable when holding the operation lever. There was a problem. In addition to the engine, the tractor includes a hydraulic continuously variable transmission (HST) as another vibration source. The hydraulic continuously variable transmission includes a hydraulic motor and a pump, and the pump is operated by the hydraulic motor. The oil discharge amount from the pump is increased or decreased by an HST operation lever provided on the side of the driver's seat. The HST operation lever is connected to the hydraulic continuously variable transmission through a link mechanism. Therefore, the vibration of the hydraulic motor (vibration generating source) of the hydraulic continuously variable transmission is transmitted to the HST operation lever via the link mechanism, and further, the vibration is transmitted to the driver holding the HST operation lever. There was a problem that the operation was uncomfortable.

  In order to solve this problem, in Patent Document 1, a rubber vibration isolating member for vibration reduction is arranged in the link mechanism.

JP 2001-171386 A

  However, in the working vehicle having such a configuration, since the vibration isolating member is arranged in the link mechanism covered with the vehicle body cover, when the rubber vibration isolating member deteriorates, the vibration isolating member is replaced. The body cover must be removed. For this reason, there existed a problem that the replacement | exchange operation | work of a vibration proof member will become large. SUMMARY OF THE INVENTION An object of the present invention is to provide a work vehicle that has good maintainability and has reduced transmission of vibration from a vibration source to an operation lever.

Therefore, the invention according to claim 1 is an engine,
A body frame on which the engine is fixed;
In a working vehicle provided with an operation lever for driving operation, attached to and supported by the vehicle body frame,
A vibration isolating member is provided between the operation lever and the vehicle body frame,
The vibration-proof member suppresses vibration from a vibration source that causes vibration due to power for traveling.

The invention according to claim 2 is an engine,
A body frame on which the engine is fixed;
An operation lever for driving operation, attached to and supported by the vehicle body frame;
In a working vehicle including a link member connected to a lower end of the operation lever and transmitting the operation of the operation lever to an operated portion.
A boot is provided so as to cover the lower part of the operation lever,
The boot is a working vehicle fixed to the body frame,
The boot is formed of an anti-vibration member;
The boot suppresses vibration from a vibration source that causes vibration due to power for traveling.

The invention according to claim 3 is an engine,
A body frame on which the engine is fixed;
An operation lever for driving operation, attached to and supported by the vehicle body frame;
In a working vehicle including a link member connected to a lower end of the operation lever and transmitting the operation of the operation lever to an operated portion.
A rigid support portion for slidably supporting the link member;
The rigid support portion is fixed to the body frame,
The rigid support portion suppresses vibration from a vibration generation source that causes vibration caused by power for traveling.

The invention according to claim 4 is an engine,
A body frame on which the engine is fixed;
In a working vehicle provided with an operation lever for driving operation, attached to and supported by the vehicle body frame,
A weight is provided at the bottom of the operation lever,
The weight suppresses vibration from a vibration source that causes vibration due to power for traveling.

According to invention of Claim 1, an engine,
A body frame on which the engine is fixed;
In a working vehicle provided with an operation lever for driving operation, attached to and supported by the vehicle body frame,
A vibration isolating member is provided between the operation lever and the vehicle body frame,
The vibration isolating member suppresses vibration from a vibration generating source that causes vibration due to driving power.

  Thereby, the replacement work of the vibration isolating member, which has conventionally been a large scale, becomes easy. Therefore, it is possible to provide a work vehicle that has good maintainability and has reduced vibration transmission from the vibration source to the operation lever.

According to invention of Claim 2, an engine,
A body frame on which the engine is fixed;
An operation lever for driving operation, attached to and supported by the vehicle body frame;
In a working vehicle including a link member connected to a lower end of the operation lever and transmitting the operation of the operation lever to an operated portion.
A boot is provided so as to cover the lower part of the operation lever,
The boot is a working vehicle fixed to the body frame,
The boot is formed of an anti-vibration member;
The boot suppresses vibration from a vibration source that causes vibration due to power for traveling.

  Thereby, the replacement work of the vibration isolating member, which has conventionally been a large scale, becomes easy. Therefore, it is possible to provide a work vehicle that has good maintainability and has reduced vibration transmission from the vibration source to the operation lever.

According to invention of Claim 3, an engine,
A body frame on which the engine is fixed;
An operation lever for driving operation, attached to and supported by the vehicle body frame;
In a working vehicle including a link member connected to a lower end of the operation lever and transmitting the operation of the operation lever to an operated portion.
A rigid support portion for slidably supporting the link member;
The rigid support portion is fixed to the body frame,
The said rigid support part suppresses the vibration from the vibration generation source which causes the vibration resulting from the motive power for driving | running | working.

  Thereby, it is not necessary to arrange a rubber vibration isolating member or the like inside the vehicle body frame and to perform replacement work due to deterioration of the vibration isolating member. Therefore, it is possible to provide a work vehicle that improves maintainability and reduces the transmission of vibration from the vibration source to the operation lever.

According to invention of Claim 4, an engine,
A body frame on which the engine is fixed;
In a working vehicle provided with an operation lever for driving operation, attached to and supported by the vehicle body frame,
A weight is provided at the bottom of the operation lever,
The weight suppresses vibration from a vibration source that causes vibration due to power for traveling.

  Thereby, the replacement work of the vibration isolating member, which has conventionally been a large scale, becomes easy. Therefore, it is possible to provide a work vehicle that has good maintainability and has reduced vibration transmission from the vibration source to the operation lever.

It is a side view of the tractor as an example of the working vehicle of this invention. It is a figure for demonstrating the principal part inside FIG. It is a figure for demonstrating the principal part of FIG. It is a figure for demonstrating another principal part of FIG. It is a perspective view of an operation lever. (A) is a figure which shows attachment of the case of a HST operation lever, and a driver's seat frame, (b) is the figure which removed the driver's seat frame in (a), (c) is a perspective view of a grommet. It is a figure which shows another example of this invention, (a) is a figure which shows a boot, an HST operation lever, and arrangement | positioning, (b) is a figure which shows attachment of a boot and an HST operation lever. It is a figure which shows another example of this invention, (a) is a side view of the rigid support part attached to the mission case, (b) is A arrow sectional drawing of (a). It is a figure which shows another example of this invention, (a) is a side view of the case of the operation lever which added the weight, (b) is an expansion perspective view of a case.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a side view of a tractor 21 as an example of a working vehicle according to the present invention. The tractor 21 includes a pair of front tires (wheels) 23 and 23 on the front side of the body frame 22 and a pair of rear tires (wheels) 24 and 24 on the rear side. A bonnet 25 is disposed above the front tires 23 and 23, and an engine is provided inside thereof. And the box-shaped driving | running cabin 26 is arrange | positioned in the rear part of the bonnet 25 continuously. The rear portion of the driving cabin 26 is arranged in the vicinity of the rear tire 24. The rear tire 24 is driven by the driving force of the engine via a mission. Further, the front tire 23 rotates following the tractor 21 that travels by the driving force of the rear tire 24.

  The driving cabin 26 includes a windshield on the front surface and a rear glass 33 on the rear surface. Further, glass doors 31 are provided on the left and right side portions, respectively. Mirrors 36, 36 for rearward confirmation are provided on both sides of the front part of the driving cabin 26, respectively, headlights 34, 34 are provided on the left and right of the front upper end of the driving cabin 26, respectively, and both sides of the rear part of the driving cabin 26 are provided. The rear lamps 35 and 35 are provided. Further, below the left and right doors 31, a step ST for the driver to go up and down to the driving cabin 26 is fixed and attached to the vehicle body frame 22.

  Further, fenders 38 for covering the rear tire 24 from above are provided at lower ends of both sides of the rear portion of the driving cabin 26. A blinker and a stop lamp are provided at the rear part of the fender 38.

  As shown in FIGS. 2 and 3, the engine (drive source for traveling) 3 is fixed and supported by a pair of vehicle body frames 22 and 22 arranged on the left and right of the tractor 21. The vehicle body frame 22 includes a vehicle body frame 22A disposed in the front portion and a vehicle body frame 22B disposed in the rear portion, and both are fixed by bolts. The rear ends of the pair of left and right body frames 22B, 22B are fixed to both side surfaces of the transmission case 7 by bolts. In this way, the body frame 22 and the transmission case 7 constitute the tractor 21 body. The driving cabin 26 is fixed on the airframe.

  A hydraulic continuously variable transmission (HST) 4 is connected to the front side of the transmission case 7. An output shaft 12 from the engine 3 is attached to the entry side of the hydraulic continuously variable transmission 4 via a clutch 13. The output from the hydraulic continuously variable transmission 4 is transmitted to the mission in the mission case 7. Then, the rotational power of the transmission is transmitted to the rotating shaft 24A of the rear tire 24, and is also transmitted to the rotating shaft 23A of the front tire 23 via the transmission shaft 11 (that is, the tractor 21 can be driven by four wheels. ).

  A hydraulic case 8 is attached on the transmission case 7, and a lift arm 9 that is rotated by a driving force in the hydraulic case 8 is attached to a side portion of the hydraulic case 8. A lower link is attached to the lift arm 9 via a lift rod (not shown), and a rotary work machine or the like is attached so as to be movable up and down. Reference numeral 10 denotes a PTO axis.

  On the other hand, in the driving cabin 26, there are an operation key such as an engine key, an accelerator pedal, a clutch pedal, and a brake pedal, a shift lever, a handle 5, a driver's seat 6, and a display unit for displaying speed, fuel, alarm, and the like. Provide. Further, an HST operation lever 30 is provided on the right side of the driver's seat 6. By operating the HST operation lever 30, the trunnion shaft (described later) is rotated via the link mechanism, the angle of the swash plate in the hydraulic continuously variable transmission 4 is changed, and the hydraulic oil discharge amount of the discharge pump is reduced. Increase or decrease.

  As shown in FIGS. 4 and 5, the HST operation lever (operation lever for driving operation) 30 includes a grip 30A, a shaft 30B, a protection unit 30C, a case 30D, and the like. The lower end portion of the shaft 30B is fixed to the upper portion of the link bar 32 by welding or bolts. The link bar 32 is rotatably attached to the side surface of the mission case 7 by a fixing pin 33. One end of a link shaft 34 is rotatably attached to the lower part of the link bar 32. The other end of the link shaft 34 is rotatably attached to the upper part of the trunnion arm 35. A trunnion shaft 36 is fixed to the lower portion of the trunnion arm 35. The link bar 32 and the link shaft 34 are collectively referred to as a link mechanism. The shaft 30B extends downward from the case 30D.

  With such a configuration, the driver grips the grip 30A and moves (tilts) it forward, whereby the link bar 32 rotates counterclockwise in FIG. 4 with the fixed pin 33 as a fulcrum via the shaft 30B. In conjunction with this, the link shaft 34 is pulled rearward, and the upper portion of the trunnion arm 35 is pulled rearward to rotate the trunnion shaft 36 clockwise. On the other hand, when the grip 30A is gripped and moved (tilted) later, the link bar 32 rotates clockwise in FIG. 4 with the fixing pin 33 as a fulcrum via the shaft 30B. In conjunction with this, the link shaft 34 is pulled forward, and the upper portion of the trunnion arm 35 is pulled forward, thereby rotating the trunnion shaft 36 counterclockwise.

  The skeleton of the driving cabin 26 is constituted by cabin frames 26A, 26B, 26C, 26D, 26E and the like, and is fixed to the aircraft body by bolts or the like at the cabin frame 26B. A driver's seat frame 31 for attaching the driver's seat 6 is fixed to the cabin frames 26B and 26D with bolts.

  As shown in FIGS. 6A to 6C, the case 30 </ b> D of the HST operation lever 30 is fixed to the upper surface portion 31 </ b> B of the driver seat frame 31 (note that reference numeral 31 </ b> A is a front portion of the driver seat frame 31. is there). The case 30D is a metal cylinder formed in a square cylinder shape, and a rubber (resin) protection part 30C is attached to the upper part. The protection part 30C is formed in a substantially quadrangular pyramid shape, and includes a jaw part in the lower part thereof. The protective portion 30C is attached to the case 30D so that the jaw portion is fitted to the outer periphery of the upper end of the case 30D. A bracket 41 is fixed to the outer periphery of the lower portion of the case 30D with a bolt BT1. The bracket 41 is formed by bending a metal plate at two positions at substantially right angles so as to be substantially U-shaped in plan view. Then, another bracket 42 is passed over both ends, and both are fixed together by welding. The bracket 42 includes an upright portion 42A and a flat portion 42B. The bracket 42 is fixed to the bracket 41 at both ends of the upright portion 42A. Three through holes for penetrating the bolt BT2 are formed in the flat portion 42B.

  The upper surface 31B of the driver's seat frame 31 is formed with a through hole at a position corresponding to the three through holes and a notch slightly larger than the case 30D. Recesses 43B of grommets (vibration isolation members) 43 are fitted in the three through holes of the upper surface portion 31B. The grommet 43 is made of rubber (made of resin), and an upper portion 43A, a concave portion 43B, and a lower portion 43C are integrally formed, and a through hole for allowing the bolt BT2 to pass through is provided at the center portion. The outer periphery of the recess 43B is formed like the outer periphery of a cylinder.

  In order to fix the case 30 </ b> D to the driver's seat frame 31, first, the recess 43 </ b> B of the grommet 43 is fitted into the three through holes (described above) formed in the upper surface portion 31 </ b> B of the driver's seat frame 31. On the other hand, a bracket 41 is attached to the lower side surface of the case 30D with a bolt BT1. Since the bracket 42 is integrated with the bracket 41, the bracket 42 is also fixed to the case 30D at the same time. In this state, the case 30 </ b> D is caused to pass through and protrude from the notch formed in the upper surface portion 31 </ b> B of the driver's seat frame 31. Next, the bracket 42 </ b> B is positioned so that the through hole thereof matches the through hole of the grommet 43. Then, after fitting the washer WS, the bolt BT2 is penetrated and screwed to the nut NT. The nut NT is disposed on the back surface side of the flat portion 42B of the bracket 42 and fitted to the through hole, and is welded.

  By arranging the grommet 43 in this manner, the vibration of the engine 3 disposed on the vehicle body frame 22 is transmitted to the vehicle body frame 22 and is then passed through the cabin frames 26B and 26D attached to the vehicle body frame 22. When transmitted to the frame 31, the grommet 43 absorbs (or reduces) this vibration and does not transmit it to the case 30D (or reduces the transmitted vibration). For this reason, vibration is not transmitted (or reduced) to the protection unit 30C, the shaft 30B, and the grip 30A, and the driver operates comfortably without receiving vibration from the engine 3 when operating the HST operation lever 30. be able to.

  Further, vibration generated inside the hydraulic continuously variable transmission 4 (for example, vibration of a hydraulic motor provided in the hydraulic continuously variable transmission 4) is transmitted via the trunnion arm 35, the link shaft 34, and the fixed pin 33. Even when the signal is transmitted to the case 7 and transmitted to the driver's seat frame 31 via the vehicle body frame 22 connected to the transmission case 7, the grommet 43 absorbs (or reduces) this vibration as described above. ), It is not transmitted to the case 30D (or the transmitted vibration is reduced). For this reason, vibration is not transmitted to the protection unit 30C, the shaft 30B, and the grip 30A, and the driver can operate comfortably without receiving vibration from the engine when operating the HST operation lever 30. Therefore, when the grommet 43 of this example is used, transmission of vibration to the shaft 30B and the grip 30A can be prevented or reduced regardless of whether the vibration source is the continuously variable transmission 4 or the engine 3. In addition, the vibration isolating member of this example is not limited to a grommet.

  Next, another example will be described with reference to FIGS. In this case, the grommet 43 is not disposed on the upper surface portion 31B. Therefore, the through hole formed in the upper surface portion 31B is formed to be slightly larger than the outer diameter of the bolt BT2 (it is not necessary to form the through hole in consideration of fitting the grommet 43). Then, a boot (vibration isolation member) 51 is fitted to the lower end of the rectangular cylindrical case 30D. The boot 51 is formed in a substantially quadrangular pyramid shape, and a circular opening for passing the shaft 30 </ b> B is formed at the top thereof, and a jaw portion is provided at the lower portion. When attaching to the case 30D, the boot 51 is attached to the case 30D so that the upper and lower sides are turned upside down and the jaw portion is fitted to the outer periphery of the lower end of the case 30D. At this time, the lower portion of the shaft 30B is covered with the boot 51.

  Note that the size of the opening of the boot 51 is substantially the same as the outer diameter of the shaft 30B so that the shaft 30B always contacts the opening of the boot 51. By forming in this way, vibrations generated within the hydraulic continuously variable transmission 4 (for example, vibrations of a hydraulic motor provided in the hydraulic continuously variable transmission 4) are generated by the trunnion arm 35, the link shaft 34, the link. When the vibration is transmitted to the lower portion of the shaft 30B via the bar 32, the vibration is absorbed by the boot 51 and is not transmitted to the upper portion of the shaft 30B. Even if vibration is transmitted, the vibration is transmitted upward by reducing the vibration by the boot 51, so that the vibration transmitted to the driver holding the grip 30A can be reduced.

  Further, the vibration of the engine 3 arranged on the vehicle body frame 22 is transmitted to the vehicle body frame 22, transmitted to the transmission case 7, and is transmitted to the link bar 32 via a fixing pin 33 attached to the side surface of the transmission case 7. Even if it is transmitted and transmitted to the lower part of the shaft 30B, the boot 51 absorbs this vibration and does not transmit it to the upper part of the shaft 30B. Even if vibration is transmitted, the vibration is transmitted upward by reducing the vibration by the boot 51, so that the vibration transmitted to the driver holding the grip 30A can be reduced. Therefore, when the boot 51 of this example is used, transmission of vibration to the shaft 30B and the grip 30A can be prevented or reduced regardless of whether the vibration source is the continuously variable transmission 4 or the engine 3.

  Further, it is possible to prevent the dust from the lower part from being transmitted into the driving cabin 26 by the boot 51. The structure of the other tractor 21 is the same as that of the above-mentioned example. Reference numeral 30DH is a through hole for allowing the bolt BT1 to pass therethrough. When the boot 51 shown in FIGS. 7A and 7B is applied to the examples of FIGS. 1 to 6, vibrations from the vibration source can be more effectively reduced.

  Another example for preventing the transmission of vibration from the hydraulic continuously variable transmission 4 will be described with reference to FIGS. In this example, first, the anti-vibration rubber 62 is provided between the hydraulic continuously variable transmission 4 and the transmission case 7. By doing so, it is possible to prevent the vibration generated in the hydraulic continuously variable transmission 4 from being directly transmitted to the transmission case 7. In addition, the rigid support portion 61 formed of a highly rigid material is fixed to the mission case 7. The rigid support portion 61 is formed in a substantially cylindrical shape with metal or the like, and its side surface is fixed to the side surface of the mission case 7 by welding or the like. The inner diameter of the rigid support portion 61 is formed to be slightly larger than the outer diameter of the link shaft 34 so that the link shaft 34 can slide relative to the rigid support portion 61. By doing so, the vertical vibration generated in the hydraulic continuously variable transmission 4 is propagated to the link shaft 34, but the vertical movement of the link shaft 34 is restricted by the rigid support portion 61 (the link shaft 34 is a rigid support portion). Only slides longitudinally relative to 61). Therefore, the vertical vibration from the link shaft 34 to the link bar 32 can be prevented (or reduced). Thereby, transmission of vibration to the HST operation lever 30 can be prevented (or reduced). The structure of the other tractor 21 is the same as that of the above-mentioned example.

  As another example of preventing vibration from the engine 3, a case 130D is provided as shown in FIGS. 9A and 9B instead of the case 30D of the example shown in FIGS. May be. The case 130D is formed by forming a metal thick portion 130DW below the case 30D and setting the center of gravity of the entire case 130D downward. In this case, the grommet 43 is not disposed on the upper surface portion 31B. Therefore, the through hole formed in the upper surface portion 31B is formed to be slightly larger than the outer diameter of the bolt BT2 (it is not necessary to form the through hole in consideration of fitting the grommet 43). Reference numeral 130DH denotes a through hole for allowing the bolt BT1 to pass therethrough. The structure of the other tractor 21 is the same as that of the above-mentioned example.

  With this configuration, the vibration of the engine 3 disposed on the vehicle body frame 22 is transmitted to the vehicle body frame 22 and is transmitted to the driver's seat frame 31 via the cabin frames 26B and 26D attached to the vehicle body frame 22. When transmitted, this vibration is transmitted to the case 130D. Since the case 130D has a center of gravity at the bottom, the case 130D is stable against this vibration, and the vibration transmission rate is reduced. For this reason, the vibration transmitted to the protection unit 30C, the shaft 30B, and the grip 30A is reduced, and the driver can operate comfortably without feeling much vibration from the engine when operating the HST operation lever 30.

  The operation lever of the present invention is not limited to the HST operation lever 30 used in the above-described example, and may be a throttle lever of the engine 3 or the like. In this case, the link bar 32 and the link shaft 34 do not go to the hydraulic continuously variable transmission 4 but go to the engine 3. The configuration of the case 30D and the like is the same as that in the above example. Further, the operation lever may be connected to the hydraulic continuously variable transmission 4 or the engine 3 via a push-pull wire instead of the link mechanism.

  The present invention is not limited by the above embodiments, and can take any form without departing from the gist of the invention.

  The work vehicle according to the present invention can be applied to any work vehicle such as a work vehicle for agriculture such as a tractor, a combiner or a rice transplanter, or a work vehicle for construction such as a front loader or a backhoe.

3 Engine 4 Hydraulic continuously variable transmission (operated part)
21 Tractor (work vehicle)
22, 22A, 22B Body frame 30 HST operation lever (operation lever)
30D, 130D Case 32 Link bar (link member)
34 Link shaft (link member)
43 Grommet (Anti-vibration member)
51 Boots (Vibration Isolation Member)
61 Supporting part 130DW Thick part (weight)

Claims (4)

Engine,
A body frame on which the engine is fixed;
In a working vehicle provided with an operation lever for driving operation, attached to and supported by the vehicle body frame,
A vibration isolating member is provided between the operation lever and the vehicle body frame,
A work vehicle characterized in that the vibration isolating member suppresses vibration from a vibration source that causes vibration caused by power for traveling. Engine,
A body frame on which the engine is fixed;
An operation lever for driving operation, attached to and supported by the vehicle body frame;
In a working vehicle including a link member connected to a lower end of the operation lever and transmitting the operation of the operation lever to an operated portion.
A boot is provided so as to cover the lower part of the operation lever,
The boot is a working vehicle fixed to the body frame,
The boot is formed of an anti-vibration member;
The work vehicle, wherein the boot suppresses vibration from a vibration source that causes vibration caused by power for traveling. Engine,
A body frame on which the engine is fixed;
An operation lever for driving operation, attached to and supported by the vehicle body frame;
In a working vehicle including a link member connected to a lower end of the operation lever and transmitting the operation of the operation lever to an operated portion.
A rigid support portion for slidably supporting the link member;
The rigid support portion is fixed to the body frame,
The working vehicle, wherein the rigid support portion suppresses vibration from a vibration source that causes vibration caused by power for traveling. Engine,
A body frame on which the engine is fixed;
In a working vehicle provided with an operation lever for driving operation, attached to and supported by the vehicle body frame,
A weight is provided at the bottom of the operation lever,
A working vehicle characterized in that the weight suppresses vibration from a vibration generating source that causes vibration due to power for traveling.

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