JP2000201505A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a power transmission structure to a front-attached working machine when the front-attached working machine is connected to a working machine as a rear-attached working machine. SOLUTION: This working vehicle is constituted so that the power may be transmitted from a power output part 35 arranged at the rear part of a car body through a power transmitting structure M for a front-attached working machine B to the front-attached working machine B attached to the front of the car body. The power transmitting structure M for the front-attached working machine B has a gear case 71 synchronously connected through a chain case 76 to the power output part 35, and the front working machine B is connected to the gear case 71 through an intermediate shaft extended in the front and rear direction at the lower part of the car body, and a swingable shaft 84 swinging to follow the lifting and lowering movement of the front-attached working machine B, to the front-attached working machine B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a working vehicle.

[0002]

2. Description of the Related Art Conventionally, there is a working vehicle in which a rear working machine such as a cultivator is connected behind a vehicle body.

[0003]

However, it is conceivable that the work vehicle is used to perform work by connecting a front work machine such as a snow blower to the front of the work vehicle. Since the power take-out part for transmitting power is provided at the rear of the vehicle body, to transmit power to the front work machine,
It is necessary to separately provide a power take-out part in the front part of the vehicle body, and there is a problem that the work vehicle body needs to be remodeled and the production cost increases.

[0004]

Therefore, according to the present invention, power is supplied from a power take-out portion disposed at a rear portion of a vehicle body to a front work machine connected to the front of the vehicle body via a power transmission mechanism for the front work machine. The power transmission mechanism for the pre-installed working machine is configured such that a gear case is interlocked to the power take-out section via a chain case, the lower portion of the vehicle body extends in the front-rear direction to the gear case, and the front end portion is The front working machine is interlocked and connected via an intermediate shaft supported by an intermediate bearing provided on the lower surface of the frame and a swing shaft that swings following the lifting / lowering operation of the front working machine. It is intended to provide a work vehicle characterized by a work vehicle to be used.

[0005] The present invention also has the following features.

[0006] The gear case is disposed below a hitch body for a retrofit work machine connected to the rear of the vehicle body.

The intermediate shaft and the oscillating shaft are interlockingly connected via a universal joint, and the universal joint is disposed close to the vertical rotation center of a working machine support frame for supporting a front working machine. Further, the lower surface of the front end portion of the body frame is bent obliquely forward and upward.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are as follows.

A front work machine (snow removal machine) is connected to the front of the work vehicle so as to be able to move up and down, and a power take-out portion (PTO shaft) for driving the rear work machine provided at the rear of the vehicle body is inclined from the power take-out portion. Via a chain case that extends rearward and downward, it is operatively connected to a gear case that is arranged below the hitch body for connecting a retrofitting work machine, and an intermediate shaft that extends forward from the gear case is inserted through the lower part of the vehicle body. The front end of the shaft is linked to a swing shaft that swings following the elevating operation of the pre-installed work machine via a universal joint, and the universal joint is supported by the pre-installed work machine that supports the pre-installed work machine By arranging the power transmission mechanism for the front-mounted working machine easily in the existing work vehicle for the rear-mounted working machine, by disposing the power transmission mechanism for the front-mounted working machine close to the pivot, which is the center of rotation of the frame body.

In addition, a gear case is arranged below the hitch body so that the power transmission mechanism for the front working machine can be mounted while the rear working machine is connected.

[0011] Further, a universal joint between the intermediate shaft and the swinging shaft is arranged close to the vertical rotation center of the pre-installed working machine so as to maintain smooth power transmission irrespective of the up-and-down operation of the pre-installed working machine. ing.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a work vehicle A according to the present invention, in which a snow blower B as a front work machine is provided in front of the work vehicle A.
And a rotary cultivator C as a retrofitting work machine is connected to the rear.

As shown in FIG. 1, the work vehicle A has a vehicle body frame 2 interposed between a pair of left and right crawler traveling parts 1, 1 and, on the vehicle body frame 2, a driving part 3 is provided at a front part. The engine unit 4 and the transmission unit 5 are vertically arranged at the rear, and the running units 1 and 1 are interlocked to the motor unit 4 via the transmission unit 5.

As shown in FIG. 1, the traveling section 1 has a front driven wheel 7 and a rear driven wheel 8 attached to the front and rear ends of a traveling frame 6 extending in the front and rear direction, respectively. The connected drive wheels 9 are arranged closer to the rear than the center position between the front and rear driven wheels 7, 8 and
At the lower side, three rolling wheels 10 are axially supported at an interval in the front-rear direction.
There are 11 windings.

As described above, the front driven wheel 7 on the upper surface of the crawler belt 11 is
And the drive wheels 9 are inclined forward and downward.
Even if the interval between 1,1 is made as narrow as possible, various operation levers provided in the operation unit 3 described later and an interlocking coupling mechanism interposed between the various operation levers and the transmission unit 5 are arranged without difficulty. can do.

As shown in FIGS. 1, 2 and 3, the body frame 2 refracts a round pipe so as to have a substantially rectangular annular shape in plan view.
The vehicle body frame 2 is formed in a substantially elliptical shape which is slightly inclined forward when viewed from the side. The front end 2a of the vehicle body frame 2 is raised diagonally forward and upward, and a floorboard is stretched. Has been established.

In order to support the vehicle body frame 2, a pair of front and rear left and right connecting frames 13, 13 extending in the left and right direction are provided between the front and rear portions of the running frames 6, 6.
On the front left and right side of the front left and right connecting frame 13,
Front support for supporting the left and right front lower portions of the body frame 2
14 and 14, and rear supports 15, 15 for supporting the rear portion of the body frame 2 are provided on the left and right sides of the rear left and right connecting frame 13.

A transmission front support 16 for supporting the front end of the transmission unit 5 is erected at the center of the rear surface of the front left and right connection frame 13. A pair of right and left motor support columns 17, 17 for supporting the motor 4 are erected.

Then, a PTO shaft case 18 extending in the left-right direction is horizontally suspended between the left and right rear supports 15, 15 and the front end of the lifting link 19 is mounted on the outer peripheral surface of the central portion of the PTO shaft case 18. A hydraulic cylinder 20 for elevating and lowering the retrofitting machine is interposed between a middle portion of the elevating link 19 and the center of the rear surface of the body frame 2 so as to be rotatable. The cultivator C connected to the rear end of the lifting link 19 via the hitch body 21 is moved up and down by the expansion and contraction operation of the link 20, and in this embodiment, power is transmitted to a snow blower B described later. In order to mount the power transmission mechanism M for the pre-installed working machine,
20 is retracted to position the rotary tiller C above.

As shown in FIGS. 1 and 2, the driving unit 3
A steering column 22 is erected on the front of the body frame 2, and a steering wheel 23 is disposed on the upper surface of the steering column 22 so as to be steerable and rotatable. In the figure, 24 is a forward / reverse switching lever, 25 is a brake pedal, 26 is a shift lever, 27
Is a PTO clutch lever.

The motor unit 4 includes an engine E and a radiator, an air cleaner, and the like (not shown) disposed near the engine E. The output shaft 30 of the engine E is connected to the drive wheel 9 on the left side. Arranged upward, the output shaft 30 is connected to the input ends of a running belt transmission mechanism 31 and a PTO belt transmission mechanism 32 arranged inside the crawler belt 11 in a plan view, and each belt transmission mechanism 31, 32 output terminals are arranged before and after the output shaft 30.

As shown in FIG. 1, the transmission section 5 is provided between the transmission front support 16 and the motor support 17 and is located below the engine E.

The lower end of the traveling chain case 33 is operatively connected to the front left side of the transmission unit 5, and the upper end of the traveling chain case 33 is operatively connected to the traveling belt transmission mechanism 31 for traveling. The transmission of power to the transmission unit 5 is interrupted by a traveling clutch 31a attached to the belt transmission mechanism 31.
On the other hand, the driving wheel 9 described above is arranged at the rear of the left side surface of the transmission unit 5 while making contact with the transmission unit 5.

Although not shown, the transmission unit 5
Is a mechanical transmission that changes the gear ratio by operating the shift lever 26, a hydrostatic continuously variable transmission that changes the gear ratio by operating the steering wheel 23, and the left and right drive wheels 9,
9 has a built-in planetary gear mechanism that is linked to each other, and a power distribution mechanism that transmits the output of the hydrostatic continuously variable transmission to each planetary gear mechanism in a complementary manner. The output of the distribution mechanism is combined with each of the planetary gear mechanisms and transmitted to the left and right drive wheels 9, 9 so that the work vehicle A can move forward and backward and turn.

On the other hand, the output end of the PTO belt transmission mechanism 32 is operatively connected to the left end of a PTO shaft 35 as a power take-out portion through which the PTO shaft case 18 is inserted. The power can be transmitted to the machine C via a detachable belt (removed in this embodiment), and the PTO attached to the PTO belt transmission mechanism 32
The clutch 32a disconnects and connects the power transmission. In the figure, 36 is a tiller frame, 37 is a tiller-side input shaft, 38 is a rotary, and 39 is a rotary cover.

As shown in FIGS. 1 and 2,
Inside a casing 40 opened forward, a scraper auger 41 having a shaft extending in the left-right direction and a thrower are arranged, and the scraper auger 41 and the thrower are connected to a snowplow-side input shaft described later. Interlockingly connected to 42, by the power input to the snowplow-side input shaft 42, the snow raked by the scraper auger 41 passes through the snow removal cylinder 43 erected at the side end of the casing 40 with a thrower. Release to the outside. In the figure, reference numeral 44 denotes a sled body for holding the snow blower B at a constant ground height.

The snow blower B is connected to the front of the work vehicle A as follows. That is, the front support 1 described above
Axis 45,45 with bases 4, 4
In addition, the base end of the working machine support frame 46 is pivotally connected to the snow removing machine B via a snow removing machine mounting board 50 fixed to the distal end of the working machine support frame 46. .

As shown in FIGS. 1 to 4, the snow removing machine mounting board 50 is provided with a large-diameter hollow snow removing machine mounting shaft 51 projecting from the front of the snow removing machine mounting board 50 with its axis in the front-rear direction. Snow removal machine mounting shaft
A bearing body 52 protruding from the rear surface of the casing 40 is rotatably fitted on the casing 51, and the snow blower B is connected to be able to tilt left and right, and a hydraulic cylinder for tilting is supported on one side of the snow remover mounting board 50. body
53 protruding outward, and the tilting hydraulic cylinder support 53
Rod supporting body protruding from the tip of the shaft and above the bearing body 52
54, an electric hydraulic pump 55 for tilting which is formed by connecting an electric hydraulic pump 55 and a hydraulic cylinder 56 for tilting left and right
H1 is interposed, and the snow plow B is tilted left and right by the expansion and contraction operation of the tilting electric hydraulic cylinder H1.

Further, a work machine mounting base 57 is suspended from the center of the front end of the body frame 2, and the peripheral edge is bent forward on the front surface of the work machine mounting base 57 to increase bending rigidity. The lower part of a vertically-elongated rectangular plate-shaped hydraulic cylinder stay 58 is detachably mounted, and an elevating hydraulic cylinder support 59 is protruded from an upper front surface of the elevating hydraulic cylinder stay 58, and the elevating hydraulic cylinder support is provided. Between the snow removing machine mounting board 50 and 59, an elevating electric hydraulic cylinder H2 configured by connecting and connecting the electric hydraulic pump 60 and the elevating hydraulic cylinder 61 is interposed, and the elevating electric hydraulic cylinder H2 is connected to the elevating electric hydraulic cylinder H2. The snow removing machine B is moved up and down by the expansion and contraction operation.

A switch support rod extending outward is provided on the upper end of the right rear surface of the lifting hydraulic cylinder stay 58.
The base end of the switch support rod 62 is fixed, and the rear half of the switch support rod 62 is bent at a substantially right angle in the rearward direction.A switch box 63 is connected to the rear end of the switch support rod 62 as a lifting / lowering / tilting operation unit. Then, the switch box 63 is connected to the steering wheel 23.
Switch box 63
A tilt switch 64 for controlling the expansion / contraction operation of the hydraulic cylinder 56 for tilting left and right, and a lifting / lowering switch 65 for controlling the expansion / contraction operation of the hydraulic cylinder 61 for raising / lowering are arranged on the upper surface.

Between the PTO shaft 35 and the snow blower B, a power transmission mechanism M for the front work machine is interposed, and the power transmission mechanism M for the front work machine is attached to the snow removal machine mounting shaft. While the snow removal machine-side input shaft 42 is inserted into the inside of 51, the rear struts 15, 1
5 Gearbox support extending obliquely rearward and downward at the bottom of
The gear box 71 is attached to the lower end of the gear box support 70, and the gear box 71 is attached to the hitch body 21.
It is located below.

As shown in FIG. 5, the gear box 71 is fitted with a driving bevel gear 73 at the inner end of a gear box input shaft 72 which passes through the right side wall of the gear box 71 in the left and right direction. Gearbox output shaft with 71 front wall inserted
A passive bevel gear 75 is fitted to the inner end of the
Is meshed with the driving bevel gear 73.

The gear box input shaft 72 and the PTO shaft
Between 35 and bolt with knob
The work equipment chain case 76 is detachably mounted via a 77, as shown in FIG.
An input end of the gear box 76 is detachably attached to a right end of the PTO shaft case 18, and an output end of the working machine case 76 is detachably attached to a right end of the gear box 71. At the right end of the 35, a work implement chain case 76
The sprocket 78 inside the input end of the gearbox is spline-fitted, and the passive sprocket 79 inside the output end is spline-fitted to the right end of the gearbox input shaft 72.
A chain 80 is wound between 78 and 79.

The gear box output shaft 74 extends in the front-rear direction below the left and right connecting frames 13 and 13 and has a front end portion supported by an intermediate bearing 81 provided behind the pivot 45. And a front end of the intermediate shaft 82 is interlocked to the snow removal machine-side input shaft 42 via a swing shaft 84 having universal joints 83, 83 connected to both ends. In particular, a universal joint 83 between the intermediate shaft 82 and the swing shaft 84 is spline-fitted to the intermediate shaft 82, and the universal joint 83 is disposed as close as possible to the pivot 45 so that Power is transferred to the PTO belt transmission mechanism 32 → PTO shaft 35 → work equipment chain case 76 → gear box 71 → intermediate shaft 82 → universal joint 83 →
Oscillating shaft 84 → Universal joint 83 → Snow remover side input shaft
We communicate in the order of 42.

With this configuration, the base end of the working machine support frame 46 is detached from the left and right pivots 45, 45, and the working machine mounting base 57 is mounted.
By simply attaching and detaching the lifting hydraulic cylinder stay 58 from the vehicle, the snow removing machine B can be detached from the work vehicle A, and this operation can be facilitated.

Since the switch box 63 is provided close to the steering wheel 23, the tilt switch
Since the operation of the lifting and lowering switch 65 and the lifting and lowering switch 65 are facilitated, and the switch box 63 is supported only by the lifting and lowering hydraulic cylinder stay 58 via the switch support rod 62, the work vehicle A is integrated with the lifting and lowering hydraulic cylinder stay 58. And the snow removing machine B can be easily attached and detached.

Since the front end of the vehicle body frame 2 is raised obliquely forward and upward, interference between the front end of the vehicle body frame 2 and the work machine support frame 46 is avoided, and the lifting and lowering operation range of the snow blower B is reduced. Can be widely secured.

Further, the working machine connected to the front of the work vehicle A is driven from the PTO shaft 35 for transmitting power to the work machine connected to the rear of the work vehicle A. Clutch provided in the belt transmission mechanism 32
The power transmission structure can be simplified without the need for a separate clutch mechanism because the connection and disconnection can be performed with the 32a.

Further, a universal joint 83 between the intermediate shaft 82 and the swing shaft 84 is connected to a pivot
45, the change in the distance between the front end of the intermediate shaft 82 and the rear end of the snowplow-side input shaft 42 due to the lifting and lowering operation of the snowplow B is minimized. The power can be smoothly transmitted regardless of the lifting / lowering operation of B.

Further, since only the steering column 22 and the hydraulic cylinder stay 58 for elevating and lowering are erected in the front view from the driving section 3, the visibility in the forward direction during the snow removing operation is good.

Also, since the electric hydraulic cylinder H2 for lifting and lowering and the electric hydraulic cylinder H1 for tilting are used to raise and lower and tilt the snow blower B left and right, hydraulic piping between the snow remover B and the work vehicle A is required. The operation of the cylinders H1 and H2 can be electrically controlled by turning on / off the tilt switch 64 and the elevating switch 65. Can be easily moved up and down and tilted.

Further, since the snow blower B can be connected while the cultivator C is connected to the rear of the work vehicle A, there is no need to remove and attach the cultivator C, and the work vehicle A has a good front-to-rear weight balance. , It is possible to improve running performance and workability.

[0044]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, power is transmitted from the power take-out portion disposed at the rear portion of the vehicle body to the front work machine connected to the front of the vehicle body via the power transmission mechanism for the front work machine. The power transmission mechanism for the pre-installed working machine has a gear case interlockingly connected to the power take-out section via a chain case, the lower portion of the vehicle body extends in the front-rear direction to the gear case, and the front end portion extends to the lower surface of the body frame. A single power take-out is achieved by interlockingly connecting the front working machine via the intermediate shaft supported by the provided intermediate bearings and the swing shaft that swings following the vertical movement of the front working machine. The power supply unit can also be used for supplying power to the front work machine and the rear work machine, so that it is not necessary to separately provide a power take-out unit for the front work machine, and the manufacturing cost can be reduced.

Further, since the intermediate shaft is inserted through the lower part of the vehicle body, the power transmission mechanism for the front work machine can be mounted on the existing vehicle body without changing the structure of the work machine. It is easy to connect the front work machine to the work vehicle for the rear work machine, and the cost for this can be reduced.

According to the second aspect of the present invention, since the gear case is disposed below the hitch body for the retrofitting machine connected to the rear of the vehicle body, the gear case for the retrofitting machine is connected with the retrofitting machine. The power transmission mechanism can be mounted on the vehicle body, eliminating the need to remove the retrofitting machine, and the retrofitting machine acts as a counterweight for the retrofitting machine, improving the front-rear weight balance of the chassis. , Running performance, operability and workability can be improved.

According to the third aspect of the present invention, the intermediate shaft and the oscillating shaft are interlockedly connected via a universal joint, and the universal joint is raised and lowered by a work machine support frame for supporting a work machine. Due to the close proximity to the center of rotation, the distance between the front end of the intermediate shaft and the front work machine due to the lifting and lowering operation of the front work machine is extremely small, and power is transmitted even when the front work machine moves up and down. Can be held smoothly, and furthermore, by bending the lower surface of the front end portion of the body frame obliquely forward and upward, interference between the work machine support frame and the lower surface of the body frame can be avoided, and The lifting range can be extended.

[Brief description of the drawings]

FIG. 1 is an overall side view of a working vehicle according to the present invention.

FIG. 2 is a side view of a snowplow and a body frame.

FIG. 3 is a plan view of a front end portion of the vehicle body frame.

FIG. 4 is a front view of a lifting hydraulic cylinder stay.

FIG. 5 is a sectional plan view of a gear case.

[Explanation of symbols]

 A Work vehicle B Front work machine (snow removal machine) C Retrofit work machine (tilling machine) M Power transmission mechanism for front work machine 2 Body frame 2a Front end 21 Hitch body 35 Power take-out part (PTO shaft) 46 Work machine support Frame 81 Intermediate bearing 76 Chain case 71 Gear case 82 Intermediate shaft 83 Universal joint 84 Swing shaft

Claims (3)

[Claims] 1. A power take-out portion (35) disposed at a rear portion of a vehicle body.
The power transmission mechanism (M) is connected to the front work machine (B) connected to the front of the vehicle body via the front work machine power transmission mechanism (M). The gear case (7) to the power take-out section (35) via the chain case (76).
1), and the gear case (71) is connected to an intermediate shaft (82) supported by an intermediate bearing (81) provided by extending the lower part of the vehicle body in the front-rear direction and having a front end on the lower surface of the body frame (2). ) And a work implement (B) interlockingly connected via a swinging shaft (84) that swings following the elevating operation of the work implement (B). 2. The work vehicle according to claim 1, wherein the gear case (71) is disposed below a hitch body (21) for a retrofit work machine (C) connected to the rear of the vehicle body. 3. The intermediate shaft (82) and the oscillating shaft (84) are interlockingly connected via a universal joint (83).
The universal joint (83) is arranged close to the vertical rotation center of the working machine support frame (46) that supports the front working machine (B), and furthermore, the front end (2a) of the body frame (2) The work vehicle according to claim 1, wherein the lower surface is bent obliquely forward and upward.