JP2008195318A - Crawler-type working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler-type tractor with improved work performance and safety that reliably reduces vibrations of a cabin by vibration-proof members, while preventing fall of or damage to a coupling member for coupling a fuel tank due to the vibrations. <P>SOLUTION: The crawler-type tractor includes a cabin 4 containing a driver's seat 8 arranged on an upper portion of a chassis 1, and a plurality of vibration-proof members 105 arranged below the cabin 4. Left and right fuel tanks 6L and 6R are arranged in left and right side portions of the cabin 4 locating on the left and right sides of the driver's seat 8, a center-of-gravity position of the cabin 4 is moved to align the center-of-gravity position of the cabin 4 with a vibration-proof position of the vibration-proof member 105. The left and right fuel tanks 6L and 6R are coupled with a coupling member 113 having a shape to allow absorption of the vibrations. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a crawler-type work vehicle including a cabin in which a driver's seat disposed in the upper part of the fuselage is installed, and a plurality of vibration isolation members installed below the cabin, and more specifically, located on both sides of the driver's seat. The present invention relates to aligning the center of gravity of the cabin with the vibration isolating position of the anti-vibration member by disposing left and right fuel tanks on both sides of the cabin and moving the center of gravity of the cabin.

  In a conventional crawler type tractor (work vehicle), for example, as shown in FIG. 10, a front center position 202 that is the front end of the cabin 201 and substantially the center of the left and right, and a rear left position 203 that is the rear end and the left end of the cabin 201. The anti-vibration support member 205 is interposed between the frame 206 and the cabin 201 of the fuselage so that the anti-vibration support member 205 is disposed at the rear right position 204 which is the rear end and the right end of the cabin 201, respectively. As a result, noise and vibration with a large frequency (frequency) that are unpleasant for the operator can be reduced (Patent Document 1), and similarly between the cabin bottom and the fuselage frame, There are some which provide vibration isolation members at a total of four locations in the vicinity of both side portions and in the vicinity of both side portions of the rear portion of the cabin to provide anti-vibration support for the cabin. In addition, since the left and right fuel tanks installed on the left and right sides of the clutch housing are substantially symmetrical and each fuel tank is substantially point symmetrical, the fuel tank can be manufactured by simple sheet metal bending and welding, There is a tank in which the basic member of the tank can be made common to the left and right, and the cost can be reduced (Patent Document 2).

JP 2006-027342 A JP 2004-330798 A

However, in such a crawler type tractor (work vehicle), the front part of the cabin is larger than the rear part, the center of gravity of the cabin is biased to the front part, and it is located near the center of the cabin by the anti-vibration rubber provided below the cabin. Since the center of gravity of this cabin is deviated from the anti-vibration position, the problem is that the anti-vibration function of the anti-vibration rubber is not fully demonstrated because the cabin is not synchronized with the anti-vibration position. was there. In addition, there is a problem that the connecting member that connects the fuel tanks divided and installed on the left and right sides of the fuselage is squeezed by the vibration of the fuselage, is detached and damaged, and the fuel leaks.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a crawler with improved workability and safety that can reliably reduce the vibration of the cabin by the vibration isolating member and can prevent the connecting member that connects the fuel tank from being detached or damaged by the vibration. It is to provide an expression tractor.

  For this reason, the invention described in claim 1 is a crawler type work vehicle including a cabin in which a driver's seat arranged at the upper part of the fuselage is installed, and a plurality of vibration isolation members installed below the cabin. Left and right fuel tanks are disposed on both sides of the cabin located on both sides, and the center of gravity of the cabin is moved to match the position of the center of gravity of the cabin with the vibration isolating position of the anti-vibration member. It is characterized by that.

  According to a second aspect of the present invention, in the crawler work vehicle according to the first aspect, the left and right fuel tanks are connected by a connecting member having a shape capable of absorbing vibration.

  According to the first aspect of the present invention, in a crawler-type work vehicle including a cabin in which a driver's seat disposed in the upper part of the fuselage is installed, and a plurality of vibration isolation members installed below the cabin, both sides of the driver's seat are provided. The left and right fuel tanks are arranged on both sides of the cabin located at the position of the cabin, and the center of gravity of the cabin and the vibration isolating position of the anti-vibration member are matched by moving the center of gravity of the cabin. The fuel tank can be moved from the front part of the cabin to the rear part of the cabin, so that the cabin and the fuel tank can be reliably and efficiently vibration-proofed at the vibration-proof position. Furthermore, by disposing the fuel tanks on both sides of the driver's seat, part of the surrounding noise can be blocked by the left and right fuel tanks, and the operator in the driver's seat can work comfortably. Therefore, a crawler tractor with improved workability and safety can be provided.

  According to the invention described in claim 2, since the left and right fuel tanks are connected by the connecting member having a shape capable of absorbing vibration, the connecting member of the left and right fuel tanks that vibrates together with the cabin on the vibration isolating member is provided. Since the vibration is absorbed without being detached or damaged by the vibration, the left and right fuel tanks can be reliably connected. Therefore, a crawler tractor with improved workability and safety can be provided.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 is a left side view of a crawler tractor according to an embodiment of the present invention, FIG. 2 is a plan view of the tractor, FIG. 3 is a cross-sectional side view of the drive unit, and FIG. 4 is a cross-sectional plan view of the drive unit.

  First, a schematic configuration of the crawler tractor 1 will be described. As shown in FIG. 1, a bonnet 2 that covers an engine 3 at the front of the vehicle 1 and has a headlight 12 at the front end, and a vehicle 1 on the steering column 16 at the rear of the dashboard 17 is located behind the bonnet 2. A cabin 4 having a steering section of a vehicle in which a steering handle 9, a brake 7, a driver's seat 8 and the like are arranged to be disposed on the left and right body frames 11. On the left and right sides of the driver's seat 8, various levers such as a main transmission lever, a sub transmission lever, and a PTO operation lever for operating the vehicle 1 and raising / lowering a working machine (not shown) are disposed.

  Further, the cabin 4 is formed of a roof 13, a front / rear glass 12, a side glass door 14 and the like so as to cover the entire driver's seat 8. The left and right fuel tanks 6 and the left and right flasher lamps 15 are disposed on both sides of the driver's seat 8 and outside the cabin 5. Further, a step 10 for raising and lowering to the driver's seat 8 is provided below the cabin 4, and the working machine that can be removed depending on the work is attached to the rear of the vehicle 1. Work such as a rotary. In addition, a pair of left and right crawler type traveling devices 80 for traveling the vehicle 1 are disposed below the vehicle 1.

  The crawler type traveling device 80 includes a left and right crawler frame 81 extending in the traveling direction and two side frames 79 that connect the crawler frame 81. A left and right front axle case 82 is fixed to the front end of the crawler frame 81. The left and right drive sprocket 60 is supported on the left and right axles 89 supported by the left and right front axle cases 82. A left and right driven idler 85 is rotatably supported at the rear end of the crawler frame 81, and a crawler belt 88 is wound between the outer periphery of the driving sprocket 60 and the driven idler 85. The four equalizer wheels 86 are rotatably supported between the driven idler 85 and the front and rear.

  Hereinafter, first, the traveling and transmission system of the crawler tractor 1 will be described with reference to FIGS. The left and right axles 89 of the crawler type traveling device 80 are connected to the output shaft of the engine 3 via the forward / reverse switching mechanism 21, the main transmission gear transmission mechanism 22, the auxiliary transmission gear transmission mechanism 23, the traveling transmission shaft 24, and the differential mechanism 25. The PTO output shaft 29 that projects the rear transmission case 30a to the forward / reverse output shaft 26 of the forward / reverse switching mechanism 21 via the PTO clutch 27 and the PTO speed change gear transmission mechanism 28 while driving the vehicle 1 while being connected. Power is transmitted to the work machine that is connected and installed behind the machine body.

  Further, a forward / reverse switching mechanism 21 and a main transmission gear transmission mechanism 22 are provided in a transmission case 30b between the rear transmission case 30a and the engine 3, and the input shaft 31 of the forward / reverse switching mechanism 21 is connected via a damper 32. The main transmission shaft 33 of the main transmission gear transmission mechanism 22 is connected to the forward / reverse output shaft 26 of the forward / reverse switching mechanism 21 while being connected to the output shaft of the engine 3.

  Further, a sub-transmission gear transmission mechanism 23 is provided in the front part of the rear transmission case 30a, and a PTO transmission gear transmission mechanism 28 is provided in the rear part of the rear transmission case 30a. The main transmission shaft 33 is provided with the sub-transmission gear transmission mechanism 23. The auxiliary transmission shaft 34 is connected, the brake shaft 37 of the traveling brake device 36 is connected to the rear end of the auxiliary transmission shaft 34 via a pair of bevel gears 35, and the transmission is transmitted to the front end of the auxiliary transmission shaft 34 via the intermediate shaft 38. The rear end of the shaft 24 is connected.

  Next, the front mission case 30c is provided with a differential mechanism 25 including a left and right planetary gear mechanism 39, and a left and right sides are connected to the front end of the traveling transmission shaft 24 via a differential input shaft 40, a bevel gear 41, and a planetary gear input shaft 42. The planetary gear mechanism 39 is connected, and the traveling shift output from the traveling transmission shaft 24 is transmitted to the left and right axles 89 via the left and right planetary gear mechanisms 39 and the planetary gear output shaft 43, so that the left and right crawler type traveling devices 80 are identical at substantially the same speed. It is set as the structure which drives to a direction and makes the vehicle 1 drive forward or backward.

  Further, the turning HST pump 44 and the turning HST motor 45 of the turning hydraulic transmission mechanism (HST) for turning the machine body are separately arranged. For example, the turning HST pump 44 is arranged on the right outer side of the transmission case 30b. The pump shaft of the turning HST pump 44 is connected to the front end of the main transmission shaft 33 via a set of three transmission gears 46 so that the power after the main transmission is input to the pump shaft, and the front transmission case 30c The turning HST motor 45 is fixed to the front surface of the motor, and the motor shaft of the turning HST motor 45 is connected to the left and right planetary gear mechanism 39 via the left and right reversing bevel gear 49 and the left and right gear shafts 50. Steering output to be shifted by the turning HST motor 45 is transmitted to the left and right axles 89 via the left and right planetary gear mechanism 39, and the left and right crawler traveling Device 80 is driven at a substantially constant speed, and the rotational difference of the left and right crawler type traveling device 80 is proportional to the traveling speed of the main gear shift stage, and the left or right at the same turning radius even if the main gear shift stage is switched. It is set as the structure which turns a body in a direction.

  Furthermore, an air conditioner (not shown) or the like can be provided in the cabin 4 of the vehicle 1. In this case, since the engine 3 is loaded by the air conditioner drive, a controller (not shown) that electronically controls the rotational speed of the engine 3 is provided. With this controller, the number of revolutions of a cooling fan that cools a condenser (not shown) of the air conditioner is proportional to the number of revolutions of the engine 3, and the controller sets the idling speed of the engine 3 to be less than that when the air conditioner is stopped. When the engine 3 is idling up, the speed of the engine 3 is increased so that the controller 3 is proportional to the height of the refrigerant pressure detected by a pressure sensor (not shown). You may make it the structure which sets this.

  Next, a specific configuration of the vibration isolating structure for the cabin according to the present invention will be described. FIG. 5 is a perspective view of the vicinity of the fuel tank installed on the left side of the fuselage, FIG. 6 is a perspective view showing the vibration isolator provided below the fuel tank installed on the left side of the fuselage (when the fuel tank is removed), and FIG. FIG.

  As shown in FIGS. 5 to 6, the left and right fuel tanks 6 </ b> L and 6 </ b> R (only the left and right fuel tanks 6 </ b> L are shown in FIG. 5) are configured by a metal double structure, and the cabin 4 located on both sides of the driver's seat 8. It is placed on the pedestal 100 via the vibration isolator 101 on the mount 102 attached to the rear part of the left and right airframe frames 11 at both sides, and is detachable with a fastener 4b provided on the side plate 4a of the cabin 4, etc. Fixed to.

  As shown in FIG. 1, the anti-vibration part 101 is provided below the cabin 4 and between the front and rear of the left and right body frames 11 and the cabin 4 in total.

  This anti-vibration member 105 is a shear type, and is attached to the upper surface 106a and the lower surface 106b of the plate 106 by heat welding or the like as shown in FIG. 7, for example, natural rubber, chloroprene rubber, nitrile rubber, butyl rubber, etc. Anti-vibration members 105 a and 105 b made of synthetic rubber or the like are fastened to the bracket 103 via the plate 106 with bolts 110.

  At this time, the anti-vibration member 105 b protrudes downward from a hole 103 a provided in the vicinity of the center of the bracket 103, and the upper surface of the anti-vibration member 105 a is brought into contact with the pressing plate 107 attached to the lower surface of the cabin bottom plate 104. . Since the plate 106 is bolted to the bracket 103, the vibration isolation member 105 does not fall downward. The bracket 103 is fastened to the mount 102 by a bolt 109 around the hole 103a.

  Further, a through hole h is provided in the vicinity of the center of the pressing plate 107, the vibration isolating members 105a and 105b, and the plate 106, and the fastener 108a is attached to the through hole from below the hole 102a provided in the vicinity of the center of the mount 102. The upper end of the fastener 108a is inside the hole 104a provided near the center of the cabin bottom plate 104, and is fastened by a fastener 108b such as a nut on the upper surface of the pressing plate 107. It is attached between the cabin bottom plate 104 and the mount 102, and the vibration isolator 101 is configured. Since the diameter of the lower end umbrella portion of the fastener 108a is larger than the diameter of the hole portion 102a of the mount 102, the lower end umbrella portion of the fastener 108a does not pass through the hole portion 102a, and the vibration isolating member 105b is received by the fastener 108a. Are fixed to the mount 102 and the bracket 103.

  With the above configuration, first, the left and right fuel tanks 6L and 6R are arranged on both sides of the cabin 4 located on both sides of the driver's seat 8, and therefore, part of the surrounding noise is transferred to the left and right fuel tanks 6L and 6R. Therefore, the operator of the driver's seat 8 can work comfortably. The left and right fuel tanks 6L and 6R move the center of gravity of the cabin 4 at the front part to the rear part of the cabin 4 because the front part of the cabin 4 is large. In addition, the cabin 4 and the left and right fuel tanks 6L and 6R can be efficiently damped.

  Furthermore, the vertical vibration of the airframe 1 is absorbed and reduced by the shear type vibration isolating member 105 of the vibration isolating portion 101, and the bracket 109 on which the bolt 109 is fastened on the mount 102 into which the vibration isolating member 105b is inserted. 103, vibrations in the front-rear and left-right directions of the body 1 are also absorbed and reduced by the vibration-proof member 105b, and the front-rear, left-right direction of the body 1 of the vibration-proof member 105 is reduced by the bracket 103 and the plate 106 fastened to the bracket 103 with bolts 110. Transition to can be prevented.

  Next, a specific configuration of the fuel tank connecting member according to the present invention will be described. FIG. 8 is a schematic back view of the vicinity of the left and right fuel tanks, and FIG. 9 is a schematic plan view showing the space between the left and right fuel tanks.

  The left and right fuel tanks 6L, 6R installed on both sides of the cabin 4 located on both sides of the driver's seat 8 are the front part of the bottom of either the fuel tank 6L or the fuel tank 6R (the fuel tank 6L in FIG. 9). The other end of the fuel extraction pipe 111 whose one end is connected to the engine 3 is connected to a fuel supply port (not shown) included in the above. Although not shown, the left and right fuel tanks 6L and 6R are connected to one end of a breather hose for releasing air when fuel is injected into the left and right fuel tanks 6L and 6R and for releasing pressure applied to the inside of the fuel tanks 6L and 6R to the outside. From the hose connected to the breather port of either the fuel tank 6L or the fuel tank 6R, with the other end attached to the breather port provided in each upper part with the other end facing the appropriate direction You may branch and provide a breather hose.

  The fuel in the left and right fuel tanks 6L and 6R can be circulated to the oil passage ports 112L and 112R provided in the rear portions of the bottoms of the left and right fuel tanks 6L and 6R. Both ends 113a and 113b of the connecting member 113, which is a hose made of a rubber material and metal, preferably having flexibility, are connected (a connecting tool (not shown) or the like may be used).

  As shown in FIG. 8, the connecting member 113 between the left and right fuel tanks 6L and 6R has, for example, a substantially U-shape that protrudes upward in the rear view so as not to come into contact with the lower object while the aircraft is running. Further, as shown in FIG. 9, in the front-rear direction of the fuselage 1 between the left and right fuel tanks 6L, 6R, the vicinity of the center of the connecting member 113 has a bottom view, for example, a substantially S-shape (substantially reverse S in bottom view). The shape may be a letter shape). The fuel supply port and the breather port are not limited to the above, and are appropriately provided in the left and right fuel tanks 6L and 6R. Further, the connecting member 113 is not limited to a substantially U shape in rear view or a substantially S shape in bottom view, and may have any shape that can absorb the vibration of the connecting member 113 in the three-dimensional direction. Further, the connection of the fuel take-out pipe 111 is not limited to the front part of the bottom part of either the fuel tank 6L or the fuel tank 6R, and may be connected to the middle part of the connecting member 113.

  With this configuration, the anti-vibration member 105 that vibrates via the left and right fuel tanks 6L and 6R that vibrate in synchronization with the vibration of the cabin 4 installed on the anti-vibration member 105 is arranged in the vertical direction of the body 1. The vibration is absorbed and reduced by the degree of freedom of the substantially U-shaped rear view of the connecting member 113, and the vibration in the front-rear and left-right directions of the fuselage 1 is substantially S-shaped (substantially reverse S-shaped in bottom view). Therefore, it is possible to prevent the connection member 113 from being damaged or the connection member 113 and the left and right fuel tanks 6L and 6R from being loosened or detached.

  As described above in detail, the crawler tractor 1 of this example is a crawler that includes the cabin 4 in which the driver's seat 8 disposed in the upper portion of the fuselage 1 is installed, and the vibration isolation members 105 that are installed below the cabin 4. In the type work vehicle, left and right fuel tanks 6L and 6R are arranged on both sides of the cabin 4 located on both sides of the driver's seat 8, and the center of gravity of the cabin 4 is moved by moving the center of gravity of the cabin 4. The vibration isolating position of the vibration isolating member 105 is matched. In addition, the left and right fuel tanks 6L and 6R are connected by a connecting member 113 having a shape capable of absorbing vibration.

  In the above-described example, a crawler tractor (agricultural work machine) has been described as an example of a work machine. However, the present invention is not limited to this, and a combiner or the like as a farm work machine or a backhoe as a construction work machine. Therefore, it can be applied to all working machines equipped with fuel tank and cabin, such as bulltoza.

It is a left view which shows the crawler type tractor as an example of this invention. It is a top view of a crawler type tractor. It is a cross-sectional side view of a drive part. It is a cross-sectional top view of a drive part. It is a perspective view of the fuel tank vicinity installed in the left side of the body. It is a perspective view which shows the vibration isolator which has a fuel tank lower part installed in the body left side. It is an assembly drawing of a vibration isolator It is a back surface schematic diagram of the left-right fuel tank vicinity. It is the plane schematic diagram which showed between left-right fuel tanks. It is a schematic diagram which shows the cabin provided with the vibration isolator of the conventional tractor.

Explanation of symbols

4 Cabin 4a Side plate 4b, 108a, 108b Fastener 6L, 6R Left and right fuel tank 8 Driver's seat 100 Receiving base 101 Vibration isolator 102 Mount 102a, 103a Hole 103 Bracket 104 Cabin bottom plate 105, 105a, 105b Anti-vibration member 106 Plate 106a Upper surface 106b Lower surface 107 Press plate 109, 110 Bolt 112L, 112R Oil passage port 113 Connecting member 113a, 113b Both ends h Through hole

Claims (2)

A cabin with a driver's seat located at the top of the aircraft,
A plurality of vibration isolation members installed below the cabin;
In a crawler type work vehicle comprising:
Left and right fuel tanks are arranged on both sides of the cabin located on both sides of the driver seat, and the center of gravity of the cabin is moved by moving the center of gravity of the cabin. A crawler-type work vehicle characterized in that   The crawler work vehicle according to claim 1, wherein the left and right fuel tanks are connected by a connecting member having a shape capable of absorbing vibration.

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