JP3715484B2 - Tractor three-point link storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a three-point tractor having a front working machine such as a front loader at the front of a vehicle body, a mounting part for mounting a rear working machine such as a backhoe at the rear, and a three-point link mounting part. The present invention relates to a link storage device.
[0002]
[Prior art]
In the tractor, an engine, a radiator, a muffler, etc. are arranged at the front part of the tractor body, and an engine room is formed by covering these with a bonnet, and a steering part having a steering handle and a driver's seat is provided on the rear side. Are known.
A work vehicle called a TLB (tractor / front loader / backhoe) having a front loader at the front of the tractor vehicle body and a backhoe at the rear is also known.
[0003]
[Problems to be solved by the invention]
This type of tractor mainly employs a suction-type (backward sweep-type) radiator, which makes it easy for heat from the engine compartment to flow to the rear driver's seat. There was a problem that the environment (livability) deteriorated.
Further, when the exhaust of the muffler is swept from the side of the engine room, the working environment of the driver is also deteriorated by the exhaust flowing to the driver's seat side.
[0004]
On the other hand, in a work vehicle such as a TLB, the three-point link must be removed from the tractor body when the backhoe is installed. It is necessary to consider.
According to the present invention, the lower link constituting the three-point link can be stored between the support member of the front work machine and the engine room, and heat from the engine room can be shielded using the stored lower link. By doing so, an object of the present invention is to provide a three-point link storage device for a tractor that can solve the above-mentioned problems all at once.
[0005]
[Means for Solving the Problems]
The present invention takes the following technical means to achieve the above object.
That is, the present invention includes an engine room provided with an engine on the front side of the driver's seat, a support member that supports the front work machine on the side of the engine room, and a three-point link mechanism at the rear part of the vehicle body. In a tractor equipped with
A holding tool for holding the pair of lower links is provided so as to close the space between the support member and the engine room by the pair of lower links of the three-point link mechanism removed from the mounting portion at the rear of the vehicle body. It is what.
[0006]
According to this, it becomes possible to store the lower link between the engine room and the support member via the holder, and it becomes possible to eliminate the loss of the lower link and the troublesome storage. At the same time, it is possible to block the heat flowing from the engine room through the side to the driver's seat by the lower link, which improves the working environment for the driver.
In the above case, it is preferable that the holder can hold the plate surface portion in the front-rear direction in a state where a pair of lower links are arranged side by side.
[0007]
As a result, the space between the support member and the engine room is blocked to the maximum by the lower link, so that heat can be shielded more reliably.
When the engine room includes a muffler that exhausts from the side of the engine room, the holder has a pair of lower links between the engine room side of the muffler exhaust side and a support member. It is preferable to provide it so as to hold it.
As a result, the exhaust from the engine room can be blocked by the lower link held by the holder, and the working environment of the driver is further improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 11 shows a so-called TLB (tractor / front loader / backhoe) in which a front loader 2 and a backhoe 3 are respectively attached to the front and rear portions of the tractor 1.
The tractor 1 mainly comprises a vehicle body 7 by connecting an engine 4, a clutch housing, a transmission case 6 and the like to the front and rear. The vehicle body 7 is driven by a pair of left and right front wheels 8 and a pair of left and right rear wheels 9. Supported as possible.
[0009]
On the rear upper surface of the vehicle body 7, a hydraulic device 10 and a floor sheet 11 that covers the hydraulic device 10 are provided. As shown in FIG. 8, the rear surface of the vehicle body 7 is provided with a mounting portion 16 that can mount a three-point link mechanism 15 having a top link 12, a lower link 13, and a lift rod 14. The three-point link mechanism 15 can be moved up and down by the lift arm 10A.
A driver's seat 17 is provided on the floor seat 11, and the driver's seat 17, the steering handle 18, the pedal 19, and the like constitute the steering unit 20 of the tractor 1.
[0010]
Further, the driver's seat 17 is supported so as to be rotatable about the vertical axis, and the posture can be freely changed between a forward posture where the tractor 1 and the front loader 2 are steered and a rearward posture where the backhoe 3 is steered.
As shown in FIGS. 1 and 2, the engine 4 is covered with a bonnet 21 that forms an engine room A. In the bonnet 21, an exhaust muffler 22 is disposed on the upper left portion of the head of the engine 4 via an exhaust manifold. The exhaust pipe 22A of the muffler 22 is configured to extend downward and to the left front, and to protrude from the side surface of the bonnet 21 to exhaust.
[0011]
A radiator 23 is disposed in front of the engine 4, and fresh air is taken in from the front grill 25 and both left and right sides of the bonnet 21 by a radiator fan 24 that is rotationally driven by power from the engine 4. Heat is exchanged and swept backwards.
The crankshaft of the engine 4 protrudes forward to serve as a power take-out shaft 27, and the rear end of the transmission shaft 28 is connected to the take-out shaft 27, and a hydraulic pump 29 for power steering is attached to the front end of the transmission shaft 28. Are connected, and the power from the take-out shaft 27 is transmitted to the hydraulic pump 29 via the transmission shaft 28.
[0012]
Referring to FIG. 4 showing this detail, a pulley 30 is attached to the base end side of the take-out shaft 27 so that the radiator fan 24 is driven via a belt 31 wound around the pulley 30. It has become.
Further, a rear coupling joint 32 having a flange 32A is spline-coupled to the distal end portion of the take-out shaft 27, and a bolt 33 is fastened to the flange 32A and the side surface of the pulley 30.
A rear connection disk 35 is fastened to the rear connection joint 32 via a spacer 34, and a bolt 37 is fastened to the rear connection disk 35 and a rear end plate 28 </ b> A of the transmission shaft 28. A front connection disk 38 is fastened to the plate 28B by a bolt 39, and a front connection joint 41 fitted to the input shaft 29A of the hydraulic pump 29 is fastened to the front connection disk 38 via a spacer 40 by a bolt 42. It has become so.
[0013]
According to the above configuration, power transmission between the take-out shaft 27 and the rear coupling joint 32 is performed not only through the spline coupling portion between the two but also through the bolt 33 fastening portion between the pulley 30 and the rear coupling joint 32. Therefore, the transmission loss can be reduced, and fretting wear at the spline joint portion due to torque fluctuation can be prevented. Furthermore, since power transmission is distributed in two systems, the spline coupling part and the bolt fastening part, the load applied to each part can be reduced and the coupling joint 32 can be downsized (the flange 32A and the spline part can be downsized). It has become.
[0014]
As shown in FIG. 11, the tractor vehicle body 7 is provided with a mounting frame 51 for mounting the front loader 2 and the backhoe 3.
The mounting frame 51 has a front side fixed to the side of the vehicle body 7 and a rear side connected to a rear axle case 52 that protrudes left and right outward from the transmission case 6. As shown in FIG. 8, the left and right side frame members 53 extending in the front-rear direction along the vehicle body 7 and the pair of left and right front loaders 2 provided to protrude from the front side of the side frame members 53 to the left and right sides. A mounting portion (front mounting portion) 54 and a mounting portion (rear mounting portion) 55 for the backhoe 3 provided on the rear side of the side frame member 53 are provided.
[0015]
The rear mounting portion 55 includes a receiving tool 55B provided at the rear lower portion of the mounting frame 51 and a connecting pin 55C provided at the upper portion.
As shown in FIGS. 8 and 11, the backhoe 3 includes a machine frame 56 and an excavator 57 provided at the rear part of the machine frame 56, and the upper part of the machine frame 56 is directed toward the tractor vehicle body 7 side. A step 68 protruding forward is provided, and an operation box (operation portion) 69 having an operation lever 69A and the like is provided upright on the rear side of the step 68.
[0016]
The excavator 57 includes a swing bracket 58 pivotally supported by the machine frame 56 so as to swing left and right, a boom 59 pivotally supported by the swing bracket 58 so as to swing up and down, and front and rear of the boom 59. It has an arm 60 pivotally supported at its base and a bucket 61 pivotally supported at the front end of the arm 60 so as to swing back and forth. The swing bracket 58, boom 59, arm 60, and bucket 61 Are swung by a swing cylinder 62, a boom cylinder 63, an arm cylinder 64, and a bucket cylinder 65, each of which is a hydraulic cylinder. A stabilizer 66 is provided on both the left and right sides of the machine frame 56 so as to be swingable up and down by a swing cylinder 67 via brackets.
[0017]
Connecting plates 70A are provided on both the left and right sides of the front portion of the machine frame 56. A connecting bar 70B that is fitted to the receiving device 55B from above is provided at the lower portion of the connecting plate 70A. A holder 70C for holding the connecting pin 55C from above and below is provided. Then, in a state where the connecting bar 70B is fitted to the receiver 55B, the machine frame 56 is rotated forward around the axis of the connecting bar 70B, and the connecting pin 55C is sandwiched from above and below by the holder 70C. The backhoe 2 is detachably mounted on the rear mounting portion 55 of the mounting frame 51.
[0018]
As shown in FIGS. 8 and 9, a protective cover 71 is attached to the lower rear surface of the boom 59 of the backhoe 2 via a lateral support shaft 72 so as to be swingable back and forth. The protective cover 71 is formed in a plate shape from an elastically deformable rubber material or the like, and its lower end protrudes downward from the lower end of the boom 59.
Here, in the TLB, the backhoe 3 protrudes rearward with respect to the tractor 1, so that the backhoe 3, particularly the lower part of the swing bracket 58 and the boom 59 may come into contact with the outside when the front loader 2 is moving backward. In some cases, the paint peels off due to this contact and causes rust, or sand or the like enters the fulcrum pin 58A of the swing bracket 58 or the fulcrum pin 59A of the boom 59 to cause wear.
[0019]
Therefore, in this embodiment, by providing the protective cover 71 as described above, the lower part of the boom 59 and the swing bracket 58 are covered from behind to protect them from contact with the outside, and the protective cover 71 can be elastically deformed. By providing a member so as to protrude downward from the lower end portion of the boom 59, it is possible to prevent the sand and the like from entering because the fulcrum pins 58A and 59A are covered and covered when elastically deformed. ing.
Further, since the protective cover 71 is elastically deformable and can be swung back and forth, the start angle α of the tractor 1 can be sufficiently secured by the rocking or elastic deformation.
[0020]
As shown in FIGS. 1 to 3, the front loader 2 includes a pair of left and right masts (support members according to the present invention) that are detachably connected to the front mounting portion 54 of the mounting frame 51 via pins 73 and the like. 74 is provided. The mast 74 is provided upright on both right and left sides of the rear portion of the bonnet 21 (engine room A), and a boom 75 is supported on the upper portion of each mast 74 so as to be swingable up and down.
A bucket 76 (see FIG. 11) is pivotally supported at the front end of the boom 75 so that it can be scooped and dumped. A brace 77 is installed between the upper side of the mast 74 and the front part of the vehicle body 7. The bucket 76 is driven to swing by a boom cylinder 78 and a bucket cylinder 79, respectively.
[0021]
The mast 74 may be fixed to the front mounting portion 54 so as not to be detachable.
The left side of the pair of left and right masts 74 is provided with a storage portion (first storage portion) 81 for storing the pair of lower links 13 removed from the three-point link mounting portion 16.
The left side frame member 53 has a second storage portion 82 for storing the top link 12 on the upper surface thereof, and the right side frame member 53 has a third storage space for storing the pair of left and right lift rods 14. A storage portion 83 is provided.
[0022]
The first storage portion 81 has a pair of upper and lower holders 84 protruding from the left and right inner surfaces of the mast 74 toward the bonnet 21 of the tractor vehicle body 7. Protrusively provided.
As shown in FIG. 3, the left and right coupling pins 84 </ b> A provided on the upper holding tool 84 are inserted into the ball joint 13 </ b> A at one end of each lower link 13, and the left and right coupling provided on the lower holding tool 84. The pin 84 </ b> A is configured to be held in the lower link 13 by the upper and lower holders 84 by being inserted into a hole 13 </ b> B that is formed in the middle in the longitudinal direction of the lower link 13 and used for coupling with the lift rod 14. Yes.
[0023]
Further, a pair of left and right connecting pieces 85 are provided on the upper surface of the left side frame member 53 so as to protrude upward, and the free end of the check chain 86 attached to the lower link 13 is connected to the connecting piece 85 and the turnbuckle is connected. By tensioning the check chain 86 via 86A, the coupling of the lower link 13 to the holder 84 is strengthened, and the lower link 13 is prevented from coming off or rattling due to vibration of the tractor 1 or the like. ing.
The second storage portion 82 is provided with a pair of left and right clip members 87 formed by spring plates or the like at a plurality of front and rear locations along the side frame member 53, and holds the top link 12 by sandwiching the top link 12 by the clip members 87. It is composed.
[0024]
The third storage portion 83 is provided with two pairs of left and right clip members 88 formed by spring plates or the like at a plurality of front and rear locations along the side frame member 53, and sandwiching the pair of lift rods 14 by the left and right clip members 88. It is configured to hold.
As described above, when the backhoe 3 is mounted on the rear portion of the tractor vehicle body 7, the lower link 13, the top link 12, and the lift rod 14 are removed from the three-point link mounting portion 16, and these are connected to the first to third storage portions 81-1. By storing it in 83, it is possible to eliminate the loss and troublesome storage.
[0025]
Further, when the lower link 13 is attached to the holder 84 as described above, the pair of lower links 13 are arranged side by side with the plate surface portions facing in the front-rear direction. The left and right sides of the mast 74 and the bonnet 21 (engine room A) are closed.
Therefore, the lower link 13 divides the bonnet 21 and the control unit 20 (driver's seat 17) at the side positions thereof, and the heat discharged from the engine room A (the heat of the engine and the radiator) The function of shielding the exhaust wind) from reaching the driver's seat 17 is achieved.
[0026]
In other words, according to the present invention, the lower link 13 removed from the three-point link mounting portion 16 is not simply stored between the mast 74 and the engine room A, but is stored so as to close the space between the engine room A and the engine room A. Therefore, the driver's working environment (livability) can be improved.
Further, when the rear sweep-out type radiator 23 is provided in the engine room A, the exhaust air from the radiator 23 can easily flow backward, so that it is particularly preferable to store the lower ring 13 as described above. It will be useful.
[0027]
Since the first storage portion 81 is provided not for the right mast 74 but for the left mast 74 on the same side as the exhaust side of the muffler 22, the lower link 13 may block the exhaust from the muffler 22. It is possible.
In addition, in the above, the structure of the holder 84 in the 1st accommodating part 81 is not restricted to the pin form inserted in the ball joint 13A and the hole 13B of the lower link 13, but as a clip form by a leaf spring, a bolting form, etc. Alternatively, the second and third storage portions 82 and 83 for storing the top link 12 and the lift rod 14 may be arranged in the left-right direction, or these may be provided for the left and right braces 77.
[0028]
As shown in FIG. 5, the front grill 25 of the bonnet 21 is detachable from the front opening 21A of the bonnet 21, and the lower edge of the front grill 25 protrudes from the lower edge of the opening 21A. The upper edge of the front grill 25 is fixed by a lock 90 provided on the upper edge of the opening 21A.
In FIG. 6 showing the details of the locking device 90, a vertical groove 91 is formed at the upper edge of the front grill 25, and a projecting piece 92 protruding downward is formed at the upper edge of the opening 21A. Yes. A shaft portion 90A of the locking device 90 is inserted in the protrusion 92 in the front-rear direction, and a washer 93 and a retaining pin 94 are attached to the rear end of the shaft portion 90A, and a shaft between the washer 93 and the protrusion 92 is attached. A compression coil spring 95 is fitted on the portion 90A.
[0029]
A finger hook portion 90B formed by bending a bar in a U-shape is provided at the tip of the shaft portion 90A. Both ends (positioning protrusions 90C) of the finger hook portion 90B are opposed to the front grill 25, and the front grill 25 It can be inserted into the positioning hole 96 formed in the above. The locking device 90 is in a locked state when the finger hook portion 90B is in a horizontal posture, and is in an unlocked state when in a vertical posture.
In the above configuration, when the front grill 25 is aligned with the opening 21 </ b> A of the bonnet 21 with the finger hook 90 </ b> B in the vertical orientation, the finger hook 90 </ b> B protrudes forward from the groove 91 of the front grill 25. Then, the lock 90 is rotated 90 degrees laterally while pulling forward via the finger hook portion 90B, and is locked by pressing the finger hook portion 90B against the front grill 25 by urging the compression coil spring 95.
[0030]
At this time, since the positioning projection 90C of the finger hook portion 90B is inserted into the positioning hole 96, the rotation of the locking device 90 around the shaft portion 90A is prevented, and the locking device 90 is naturally locked by vibration of the tractor 1 or the like. The situation is prevented from being released. Further, since the U-shaped finger hook portion 90B is provided, the locking device 90 can be easily pulled against the spring 95, and the positioning protrusion 90C is formed using the finger hook portion 90B. Simplification and cost reduction.
[0031]
The transmission case 6 incorporates a hydrostatic transmission (HST) that performs forward / reverse shifting of the tractor 1, and an operating pedal 98 for the HST is provided in the control unit 20. As shown in FIG. 9A, the operation pedal 98 includes a pair of front and rear arms 100 attached to the mission case 6 and the like via a pivot 99 so as to be able to swing back and forth. A plate 101 is fixed, and a pedal 102 is detachably attached to the attachment plate 101.
[0032]
As shown in FIG. 9B, the pedal 102 is formed by covering the upper surface portion of the base plate 103 with a tread plate 104 such as a rubber material, and a bolt 105 protrudes from the lower surface of the base plate 103. An insertion hole 106 is formed substantially at the center of the mounting plate 101, and a bolt 105 is inserted into the insertion hole 106, and a wing nut 107 is screwed into a lower end portion of the bolt 105, whereby the pedal 102 is attached. It can be attached to the plate 101.
Here, the bolt 105 is provided at a position eccentric from the center of the base plate 103 in the front-rear direction, and the pedal 102 is rotated back and forth by 180 ° around the bolt 105, whereby the front-rear position of the pedal 102 with respect to the mounting plate 101 is determined. Can be adjusted.
[0033]
Positioning protrusions 108 are provided on the lower surface of the base plate 103, and the mounting plate 101 is provided with a pair of positioning holes 109 for fitting the protrusions 108 on both sides of the insertion holes 106. By fitting the protrusions 106 into either of them, the pedal 102 can be positioned at the front and rear positions with respect to the mounting plate 101.
Thus, by adjusting the front and rear position of the pedal 102 with respect to the mounting plate 101, it is possible to cope with the size and length of the driver's foot. For example, as shown in FIG. When the position of the front pedal 102R is adjusted to the front side with respect to the plate 101 and the position of the rear pedal 102R is adjusted to the rear side with respect to the mounting plate 101, the distance between the front and rear pedals 102F and 102R is maximized to accommodate a large foot size.
[0034]
On the contrary, as shown in FIG. 10B, when the position of the front pedal 102F is adjusted to the rear side with respect to the mounting plate 101 and the rear pedal 102R is adjusted to the front side with respect to the mounting plate 101, the front and rear pedals 102F, The interval of 102R is minimized, and a small foot size can be handled.
Further, when the front and rear pedals 102F and 102R are adjusted to the front side with respect to the respective mounting plates 101 (see FIG. 10C), both the front and rear pedals 102F and 102R are moved away from the driver's seat 17, and conversely, the front and rear pedals 102F, 102F, If the position of 102R is adjusted to the rear side with respect to each mounting plate 101 (see FIG. 10D), both the front and rear pedals 102F and 102R come closer to the driver's seat 17, so the length of the driver's foot The present invention is adapted not only to the embodiment described above, but can be appropriately changed in design.For example, the rear work machine is not limited to the backhoe and may be other work machines, or the mounting thereof. The part may be configured by a pulling type such as a draw bar.
[0035]
【The invention's effect】
As described above in detail, according to the present invention, the lower link can be accommodated between the engine room and the support member via the holder, so that the loss of the lower link and the troublesomeness of storage are eliminated, and at the same time, the engine room. Thus, the heat flowing from the side to the driver's seat can be blocked by the stored lower link, and the working environment of the driver is improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a front side of a tractor according to an embodiment of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a perspective view showing a first storage unit.
FIG. 4 is a side view showing a power transmission mechanism of a hydraulic pump.
FIG. 5 is a front view of the bonnet.
6A is a detailed view of a portion A in FIG. 5, and FIG. 6B is a cross-sectional view taken along line BB in FIG.
FIG. 7 is a rear perspective view of the backhoe.
FIG. 8 is a side view of the backhoe.
9A is a side view showing an HST operation pedal, and FIG. 9B is a side cross-sectional view of the pedal.
FIG. 10 is a schematic plan view showing a state of pedal position adjustment.
FIG. 11 is an overall side view of a TLB.
[Explanation of symbols]
1 Tractor 2 Front loader (front work machine)
3 Backhoe (rear working machine)
13 Lower link 15 Three-point link mechanism 16 Three-point link mounting portion 17 Driver's seat 21 Bonnet 22 Muffler 54 Front mounting portion 55 Rear mounting portion 74 Mast (support member)
81 1st storage part 84 Holder

Claims (4)

An engine room equipped with an engine is arranged on the front side of the driver's seat, a support member for supporting the front work machine is provided on the side of the engine room, and a mounting part for a three-point link mechanism is provided on the rear part of the vehicle body. In the tractor
A holding tool for holding the pair of lower links is provided so as to close the space between the support member and the engine room by a pair of lower links of the three-point link mechanism removed from the mounting portion at the rear of the vehicle body. A three-point link storage device for the tractor. The retainer in a state of arranging a pair of lower over links to the left and right, three-point link housing device of the tractor according to claim 1, characterized in that it can be held toward the plate surface in the longitudinal direction. The engine room is provided with a muffler that exhausts from the side of the engine room, and the holder holds a pair of lower links between the engine room side of the muffler exhaust side and a support member. The three-point link storage device for a tractor according to claim 1, wherein the three-point link storage device is provided. The vehicle body is provided with a mounting frame for mounting a front loader and a backhoe, and a connecting piece for connecting a free end of a check chain attached to the lower link is provided on a side frame member of the mounting frame. The three-point link storage device for a tractor according to any one of claims 1 to 3.

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