JP3930173B2 - Support structure for transmission case in traveling vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a transmission case in a traveling work vehicle in which wheels of an engine are driven via a transmission case.
[0002]
[Prior art]
Conventionally, the spreading work vehicles proposed in Japanese Patent Application Laid-Open Nos. 10-80243 and 10-42711, etc. do not damage the crops because they travel across the crops to be planted in the field. The ground clearance of the abdomen is required to be increased. For this purpose, the transmission case for converting power from the engine to the axle and the working unit such as the spraying device is located above the fuselage frame that connects the front axle case with the front wheels on the left and right and the rear axle case with the rear wheels on the left and right. It is constructed in an intrusive structure.
[0003]
[Problems to be solved by the invention]
However, the transmission case mounting structure in the conventional traveling work vehicle as described above is reinforced by directly attaching both sides of the transmission case to the airframe frame, and further attaching the front and rear of the transmission case with mounting members provided on the airframe frame. To do. For this reason, processing distortion of the fuselage frame produced by welding the pipe member will affect the mounting state of the transmission case, which requires installation adjustment work and becomes complicated and external force that the frame receives during use Because the transmission is subjected to distortion caused by the transmission, it may be easy to cause a transmission failure or the like.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a transmission case support structure for a traveling work vehicle according to the present invention includes an engine 1c and a control unit 3 installed in a body frame 2 having a front wheel 1a and a rear wheel 1b. The transmission case 4 is transmitted to the working device mounted on the front wheel 1a or the rear wheel 1b or the machine body frame 2 via the transmission case 4, and the transmission case 4 is connected to the machine body frame 2 on both sides and the upper part thereof. Are attached and supported by a three-point support structure that connects the two, and further, the upper surface of the end portion of the front axle case 6a that supports the front wheel 1a on the lower surfaces of the left and right body side frames 20 that are the main outer frames of the body frame 2 And a work vehicle that connects the upper surface of the end of the rear axle case 6b that supports the rear wheel 1b. In the transmission case support structure in the transmission case, the transmission connection case 40 at the front of the transmission case and the front axle case 6a are directly connected to each other, and the joint 41a and the connection are connected from the traveling output shaft 41 protruding from the rear surface of the transmission case 4. The rear axle case 6b is detachably connected via a shaft 42, and the upper portion of the transmission case 4 is fixed to a bracket frame 22 that connects the two machine body side frames 20, and the transmission case 4 Are fixed between case brackets 61a protruding rearward from the front axle case 6a.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the form of the support structure of the transmission case in the traveling work vehicle of the present invention will be described with reference to the drawings.
[0007]
In the drawing, reference numeral 1 denotes a spraying work vehicle. The spraying work vehicle 1 is mounted on a body frame 2 having a front wheel 1a and a rear wheel 1b by covering the engine 1c with a bonnet 1d from the front, and various operation levers and operations are mounted on the rear thereof. A traveling work vehicle 1s including an operation unit (operation panel) including a switch, a steering unit 3 including a handle 3a and a seat 3b, which will be described later, and a transmission case 4 connected to the engine 1c and the transmission mechanism 10 is provided. On the other hand, a spraying part 5a that is mounted on the front part of the machine body so as to be movable up and down and sprays a sprayed substance such as a medicine, a storage tank 5b that is placed on the rear part of the machine body and stores the sprayed substance, and a sprayed substance from the storage tank 5b. The spraying device 5 is composed of a feeding device 5c that sends out the water, and the spraying device 5 efficiently spreads the sprayed material to the paddy field or the field crops by the spraying device 5 while self-propelled. So that it is Rukoto.
[0008]
The detailed configuration and operation of each part will be described below. First, the airframe 2 and its supporting structure and wheel transmission structure will be described with reference to FIGS.
The airframe frame 2 in the illustrated example connects two airframe side frames 20 that are main outer frames on the left and right sides of the airframe at the front and rear ends thereof with a front horizontal frame 21 and a rear horizontal frame 23, and a midway portion on the transmission case 4. Are connected by a downward U-shaped bracket frame 22, and the position of the control unit 3 is connected by horizontal frames 23, 23 a to form a rectangular rigid frame that encloses the transmission case 4 in plan view. Further, an attachment piece 20b is provided at the rear part of the control unit 3 to form a flat frame, and the storage tank 5b is detachably installed in this part. Further, the machine body frame 2 is provided with an auxiliary outer frame 20 f in parallel to the outside of the machine body side frame 20.
[0009]
The body frame 2 formed as described above can be easily disassembled and attached to the front axle case 6a, the rear axle case 6b, the transmission case 4 and the like by the support structure 6 as described below. Can be supported stably.
[0010]
That is, the front axle case 6a connected to and supported by the front left and right front wheels 1a with respect to the front portion of the body frame 2 is detachably attached and supported, and the left and right rear wheels 1b with respect to the rear portion of the body frame 2. By detachably attaching the vicinity of both ends of the rear axle case 6b to be connected and supported, both the axle cases 6a and 6b are also used as a reinforcing member for firmly connecting the front and rear portions of the two machine body side frames 20. Further, both axle cases 6a and 6b can be easily attached to and detached from both body side frames 20 from below with mounting screws.
[0011]
The front axle case 6a and the rear axle case 6b are attached to the end portions of the respective cases by mounting pieces 20a (FIG. 4) projecting outward from the two body side frames 20, and are connected to the transmission case 4 from the front. The case 40 is detachably connected to the traveling output shaft 41 protruding from the rear surface of the transmission case 4 via a joint 41a and a connecting shaft 42. As a result, the front axle case 6a is connected to the front side of the fuselage. To the fuselage frame 2 so as to be detachable. Further, the rear axle case 6b can be detachably attached to the body frame 2 from the rear side of the body and can be connected to the body frame 2.
[0012]
With this airframe assembly structure, maintenance work such as overhaul and cleaning of the airframe and assembly work can be efficiently and easily performed from the front and rear without lifting the airframe as in the conventional apparatus. Further, since the front axle case 6a and the rear axle case 6b are supported by the body side frame 20 near the ends of the cases, the moment due to the reaction force (the body weight) between the front wheels 1a and the rear wheels 1b can be reduced as much as possible. The light-weight and simple structure has a feature such that a stable support structure can be obtained.
[0013]
The front axle case 6a and the rear axle case 6b of the present embodiment support the front wheel 1a and the rear wheel 1b so as to be movable up and down via the damper-type vertical axis rotation support portion 60 at the case ends. The support structure does not give a large impact to the airframe due to unevenness or inclination of the ground during traveling, and the horizontal posture of the aircraft is always maintained in a substantially horizontal posture, so that the spraying work by the spraying unit 5a is good. To be able to do it.
[0014]
Further, as shown in FIGS. 5 and 6, the left and right vertical rotation support portions 60 on the front axle case 6a side are connected by the front steering cylinder 30, and the left and right vertical rotations on the rear axle case 6b side are further connected. The support portion 60 is connected to each other by a rear steering cylinder 30, and the front and rear steering cylinders 30, 30 are handle operation amounts of an all-hydraulic power steering 31 provided at a shaft end of a handle 4 a described later. The front and rear wheels 1a and 1b are expanded and contracted by feeding pressure oil based on the above, and the steering operation of the airframe is performed by rotating the front wheel 1a and the rear wheel 1b continuously at a cutting angle about the desired vertical axis rotation support portion 60. To be able to do it. In addition, 61 is an angle sensor which detects the cutting angle of the front wheel 1a and the rear wheel 1b.
[0015]
Next, the support structure of the transmission case 4, its transmission structure, the installation structure of the handle 3a, etc. will be described.
The transmission case 4 is attached and supported stably with a simple structure by attaching the transmission case 4 to the body frame 2 with a three-point support structure connecting both sides and the upper part of the transmission case 4.
[0016]
That is, as shown in FIGS. 5 and 6, the transmission case 4 is fixed to the lower U-shaped bracket frame 22 that connects the machine body side frames 20 provided on both sides of the transmission case 4 with mounting screws. Then, both sides of the transmission case 4 are fixed to the case bracket 61a extended from the front axle case 6a attached and fixed to the fuselage side frame 20 with mounting screws, and are attached to appropriate positions with high accuracy. Further, the transmission case 4 can be easily removed from the fuselage side frame 20 simply by loosening the three attachment screws, thereby facilitating maintenance work.
[0017]
The transmission case 4 may be mounted directly from the airframe side frame 20 on both sides. However, as shown in the example, the case bracket is provided on the front axle case 6a so as to protrude rearward from the airframe side frame 20. By mounting the transmission case 4 between 61a and 61a so as to be fitted, it floats from the body frame 2, and even if this body frame 2 has a processing distortion or twist at the time of welding or the like, this has an effect. Without being received, it can be accurately positioned at an appropriate position.
[0018]
In addition, since the distortion due to the external force applied to the body frame is not transmitted to the transmission, the transmission of the spraying device 5 as a wheel or a working device can be performed well. Since it is fixed in a suspended form via the bracket frame 22, it can be stably supported without being greatly hindered by processing distortion.
[0019]
Further, according to the support structure of the transmission case 4 configured as described above, the front axle case 6a and the transmission case 4 are assembled in three-dimensional parts in advance and inserted between the fuselage side frames 20 to attach the mounting pieces 20a, There is an advantage that both can be efficiently and firmly supported by a simple assembling operation of simply fastening the 20a and the bracket frame 22 portions with mounting screws.
[0020]
As shown in FIG. 4, when transmission operation systems such as the main transmission shifter 45, the auxiliary transmission shifter 45a, and the work machine transmission shifter 46 are collectively provided on the front side of the transmission case 4, various operation levers on the control unit 3 side ( (Not shown) and can be connected with good operability by a simple connecting means at a short distance.
The work machine output shaft 47 projecting from the rear surface of the transmission case 4 is detachably connected to a belt transmission mechanism 49 via a joint 48a and a connecting shaft 48 as shown in FIG. The feeding device 5c is driven.
[0021]
On the other hand, with the configuration described above, the transmission case 4 can be disposed at the lower rear of the engine 1c by mounting the engine 1c on the front lateral frame 21 and the fuselage side frame 20 directly above the front axle case 6a. A large space can be formed behind the engine 1c and above the transmission case 4 (FIG. 1).
[0022]
Then, it is possible to stably attach the all-hydraulic power steering 31 in this space portion to a mounting frame 22a (FIG. 5) extended upward using the bracket frame 22 so as to have a posture suitable for driving. it can. Further, since the all-hydraulic power steering 31 does not extend the steering shaft downward like a mechanical steering device, the lower and front sides of the power steering 31 can be easily opened, and the rear portion of the engine 1c can be easily opened. The transmission mechanism 10 composed of a belt and a pulley can be installed below the power steering 31 between the transmission case 4 and the transmission case 4, and further, the machine body can be compactly configured with a margin.
[0023]
In this way, the transmission case 4 is provided at the lower rear portion of the engine 1c, and the handle 3a of the control unit 3 is used as an all-hydraulic power steering 31, and the transmission case is separated from the engine 1c in a space formed below the power steering 31. 4 is configured to transmit power from the engine 1c to the transmission case 4, thereby reducing the overall length of the fuselage and preventing an overhang on the engine 1c side. This can be done without biasing. Furthermore, if an operation system such as a shift shifter for operating the transmission case 4 is collectively provided at the front part of the transmission case 4, the operation system is concentrated in one place and the structure for connecting with the operation levers is simple. It has the advantage that it can be made.
[0024]
Next, with reference to FIG. 1, FIG. 2, FIG. 5 and FIG.
First, the seat 3b is attached to the upper part of the box frame 24 installed on the horizontal frames 23 and 23a at the center in the width direction of the body frame 2, and the fuel tank 1e for the engine 1c is placed in the box frame 24. (FIGS. 1 and 2) are installed, and a fuel tank 1e is provided on the fuselage frame 2 so that the ground height of the fuselage frame 2 can be made as high as possible.
[0025]
And in the space part formed in the both sides of the seat 3b, the feeding device which consists of a feed pump etc. of the sprays, such as a chemical | medical solution accommodated in the storage tank 5b provided in the rear in the space part on the left side 5c and an elevating valve 5v for an elevating cylinder 5s (FIG. 6), which will be described later, which operates the elevating operation of the spraying part 5a by hydraulic pressure are arranged. Further, a switching valve (switching cock) 51 for switching and feeding the sprayed material operated by the feeding device 5c to the spraying pipe 50 of the spraying unit 5a constituting the spraying device 5 described later is disposed in the right space. Then, each weight structure is put together in the central abdomen of the fuselage in consideration of operability and maintenance workability, and the weight balance on the left and right of the fuselage is greatly increased due to fluctuations in the fuel in the fuel tank 1e and the scattered matter in the storage tank 5b. We are trying to improve without being affected.
[0026]
Further, the feeding device 5c is placed close to the storage tank 5b placed on the mounting piece 20b of the body frame 2 behind the seat 3b, and is connected to the discharge port by a short delivery pipe 52. As a result, the sprayed material is reliably delivered by the suction negative pressure generated when the feeding device 5c is driven, and the negative pressure line resistance can be reduced.
[0027]
Then, the switching valve 51 is interposed in the middle of the long delivery pipe 53 provided in the delivery section of the feeding device 5c, and is connected to the spray pipe 50 of the spray section 5a. The sprayed material can be sprayed from the nozzle 50a of the spray pipe 50 in a spray state without causing clogging of the pipe line or the like by the static pressure of the feeding device 5c.
[0028]
Accordingly, the feeding device 5c is disposed in the vicinity of the storage tank 5b and connected to the storage tank 5b, and the feeding device 5c and the spraying portion 5a are connected by the long delivery pipe 52, thereby reducing the suction negative pressure. While reducing the pipe resistance, there is an advantage that the spatter can be reliably sent even by the long delivery pipe 53 by the discharge pressure, and the spraying work can be performed satisfactorily.
[0029]
In addition, the seat 3b of the control unit 3 is provided in the approximate center of the body width, the fuel tank 1e is installed in a space formed below the seat 3b, and the space formed on both sides of the seat 3b. In the section, the feeding device 5c and the switching valve 51 for the sprayed material delivered from the feeding device 5c are arranged in a distributed manner, so that traveling and spraying operations are suppressed while suppressing fluctuations in the center of gravity accompanying fuel fluctuations. There is a feature that can be performed smoothly.
[0030]
Further, on the outside of the feeding device 5c and the elevating valve 5v and on the outside of the switching valve 51, a handle 9 for getting on and off is erected from the body frame 2, and assists the auxiliary outer frame 20f on both sides of the seat 3b. Step 20 s is provided to make it easy for the operator to get on and off the control unit 3.
[0031]
In this embodiment, the handle 9 is a receiving member that can stably receive and support the folding movable boom 55a of the spraying portion 5a in its retracted position as shown in FIG. 1, FIG. 2, and FIG. 90 is provided.
[0032]
The battery 91 for the engine 1c is attached to the left auxiliary step 20s in consideration of the weight balance. A microcomputer unit 92 that controls the electrical control of each part is provided below the left handle 9.
[0033]
The aircraft body frame 20 on the right side of the aircraft frame 2 formed in a square shape is provided with various harnesses 93 wired to the microcomputer unit 92 and the control unit 3 inserted therein, and the left auxiliary outer frame 20f. The oil pipes 95 and the like of the hydraulic apparatus are provided together so that the maintenance work can be easily performed without confusion between the piping and the wiring (FIG. 6). Note that the hydraulic pump 96 of each hydraulic device is integrally provided on the engine 1c side as shown in FIG.
[0034]
Next, means for installing the spraying device 5 on the traveling work vehicle 1s configured as described above will be described.
The spraying device 5 is provided with the storage tank 5b, the feeding device 5c, and the switching valve 51 as described above, and the spraying unit 5a is mounted on the support columns 21a planted on the left and right sides of the front horizontal frame 21 on the lifting cylinder. A parallel link type lifting link 54 that is operated up and down by expansion and contraction of 5 s is provided, the left and right lifting links 54 are connected by a fixed boom 55, and the movable boom 55 a is shown by a solid line in FIG. 2 on both sides of the fixed boom 55. The storage posture can be switched to the extended working posture indicated by a dotted line. The movable boom 55a and the fixed boom 55 are provided with a spray pipe 50 with a nozzle connected to the delivery pipe 53 over the entire length, and the spray section 5a is lowered to expand and expand the movable boom 55a. When the posture is set, the nozzle of the spray pipe 50 is directed downward so that the predetermined sprayed material can be sprayed satisfactorily. It is to be noted that the supply switching of the sprayed material to the spray pipe 50 attached to the fixed boom 55 and the movable boom 55a can be performed as desired by the switching valve 51 disposed in the control unit 3.
[0035]
Next, a description will be given of the control work of storing the chemical liquid as sprayed material in the storage tank 5b and controlling rice cultivation in the paddy field with the spraying work vehicle 1 configured as described above. First, the front wheel 1a and the rear wheel 1b are placed between the rice strips. When the machine body is made to travel after being disposed and the spraying unit 5a is in the working posture, the sprayed material in the storage tank 5b is sucked out through the delivery pipe 52 by the driving of the feeding device 5c, and the switching valve 51 and the delivery pipe 53 are discharged. Can be pumped through the spray pipe 50 and sprayed evenly from the nozzles to a plurality of rice plants, so that the control work can be performed efficiently.
[0036]
At this time, the engine 1c and the storage tank 5b are respectively positioned directly above the front axle case 6a and the rear axle case 6b, and the overall length of the airframe is reduced while preventing overhang.
[0037]
Furthermore, since the fuel tank 1e is provided below the seat 3b and the feeding device 5c and the switching valve 51 are arranged in a balanced manner on both sides of the fuel tank 1e, the running performance is deteriorated even with respect to fluctuations in fuel and spatter. It is possible to prevent the paddy field that can be prevented and the paddy field from sinking smoothly and smoothly.
[0038]
In the present invention, an engine 1c and a control unit 3 are installed on a body frame 2 having a front wheel 1a and a rear wheel 1b, and the power of the engine 1c is transmitted to a front wheel 1a or a rear wheel 1b or a body frame 2 via a transmission case 4. In the traveling work vehicle 1 s that drives the work device to be mounted, the transmission case 4 is supported to the body frame 2 by a “three-point support structure” that connects both sides and the upper part of the transmission case 4.
[0039]
Thus, the upper part of the transmission case 4 is fixed to the bracket frame 22 for connecting the machine body side frames 20 provided on both sides of the transmission case 4, and both sides of the transmission case 4 are fixed to the machine body side frame 20. Since it is fixed so as to be sandwiched between the case bracket 61a extended from the front axle case 6a, it can be accurately fixed at a predetermined position without being hindered by the processing distortion of the machine body frame 2, etc. Further, since distortion due to external force applied to the body frame is not transmitted to the transmission, smooth transmission can be performed.
[0040]
【The invention's effect】
As described above, in the support structure for a transmission case in a traveling work vehicle according to the present invention, the engine 1c and the control unit 3 are installed in the fuselage frame 2 having the front wheels 1a and the rear wheels 1b, and the power of the engine 1c is transmitted. In a traveling work vehicle 1 s that drives a work device mounted on the front wheel 1 a or the rear wheel 1 b or the body frame 2 via the case 4, the transmission case 4 is connected to the body frame 2 on both sides and an upper portion of the transmission case 4. It is characterized by being supported by a three-point support structure that connects the two. Therefore, the transmission case 4 can be easily and stably supported while being enclosed in the body frame 2.
[0041]
Further, the upper part of the transmission case 4 is fixed to a bracket frame 22 for connecting the machine body side frames 20 provided on both sides of the transmission case 4, and both sides of the transmission case 4 are fixed to the machine body side frame 20. Since it is fixed by a case bracket 61a extended from the axle case 6a, the transmission case 4 is supported in a state of being lifted from the body frame 2 and is not affected by the processing distortion of the body frame 2 or the like. Since the distortion due to the external force applied to the fuselage frame is not transmitted to the transmission, smooth transmission can be performed.
[0042]
Further, the transmission case 4 can be easily and efficiently assembled to the body frame 2 in a state where the parts are assembled with the front axle case 6a in advance.
[Brief description of the drawings]
FIG. 1 is a side view of a traveling work vehicle according to an embodiment of the present invention.
2 is a plan view of FIG. 1. FIG.
3 is a side view showing a configuration of a main part of a body frame of the traveling work vehicle of FIG. 1. FIG.
4 is a plan view of FIG. 3;
FIG. 5 is a side view showing the configuration of the traveling work vehicle of FIG. 1;
6 is a plan view of FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spreading work vehicle 1a Front wheel 1b Rear wheel 1c Engine 1e Fuel tank 1s Traveling work vehicle 2 Airframe frame 3 Steering part 3a Handle 3b Seat seat 4 Transmission case 5 Spreading device 5a Scattering part 5b Storage tank 5c Feeding device 5s Lifting cylinder 6a Front Axle case 6b Rear axle case 9 Handle 10 Transmission mechanism 20 Machine body side frame 22 Bracket frame 31 Power steering 42 Connection shaft 50 Spreading pipe 51 Switching valve 52, 53 Delivery pipe 61a Case bracket

Claims (1)

An engine 1c and a control unit 3 are installed in a body frame 2 having a front wheel 1a and a rear wheel 1b, and a working device is mounted on the front wheel 1a, the rear wheel 1b or the body frame 2 with the power of the engine 1c via a transmission case 4. Further, the transmission case 4 is attached to and supported by the three-point support structure for connecting the both sides and the upper part of the transmission case 4 to the body frame 2, and the main body frame 2 Traveling in which the upper surface of the end portion of the front axle case 6a that supports the front wheel 1a and the upper surface of the end portion of the rear axle case 6b that supports the rear wheel 1b are connected to the lower surfaces of the left and right airframe side frames 20 as outer frames. In a transmission case support structure for a work vehicle, a transmission train in front of the transmission case is provided. The case portion 40 and the front axle case 6a are directly connected, and the rear axle case 6b is detachably connected from a traveling output shaft 41 protruding from the rear surface of the transmission case 4 via a joint 41a and a connecting shaft 42. In addition, the upper part of the transmission case 4 is fixed to a bracket frame 22 that connects the two machine body side frames 20, and both sides of the transmission case 4 are protruded rearward from the front axle case 6a. A structure for supporting a transmission case in a traveling work vehicle fixed between case brackets 61a .

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