JPH02120131A - Multipurpose farm working vehicle - Google Patents

Abstract

PURPOSE:To make longitudinal balance so better by setting up a change gear in an almost central part in the longitudinal direction of a machine body, and projecting both rear and front power take-off shafts in the longitudinal direction from this gear shifter, in a multipurpose farm working vehicle capable of attaching farm working machery to front, web and rear parts. CONSTITUTION:A change gear C is set up in an almost central position in the longitudinal direction of a body frame 5, and an engine E and a radiator 56 are set up at the rear side in order. Covering those parts of change gear C, engine E and radiator 56, a frame cover 4 is covered on top of the body frame 5 so as to cover a part of a front steering case 55 in addition, and a seat S is set up on top of this cover 4. The change gear C is constituted so as to project a power take-off shaft 6 and an all-wheel drive shaft 7 in front and in the rear of the change gear, and a rear farm working machine such as a rotary plower R or the like is connected to a rear power take-off shaft 6b via a joint shaft 73 or the like. In addition, a front-wheel drive shaft 57 and a rear-wheel drive shaft 58 are connected to both front and rear ends of the all-wheel drive shaft 7.

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a method for carrying out simple management work such as lawn mowing, tilling, and transportation by attaching a wide variety of working machines to the front, abdomen, and rear of the lawn. This is about a multi-purpose work vehicle that can be used.

(B) Prior Art Conventionally, the technology relating to tractors with work implements attached to the front, abdomen, and rear of the tractor has been known.

(c) Problems to be solved by the invention However, in conventional tractors, the front PT○ extracts power from the engine crankshaft, and is equipped with a speed reducer or clutch device to reduce or stop the rotation. It is. For this reason, it was extremely disadvantageous in terms of space and cost.

In order to enable work equipment to be placed at the front, abdomen, and rear of the aircraft, and to enable efficient work, the present invention places the transmission in the center of the aircraft in the longitudinal direction, and places the seat above it. By lowering the seat, there are no obstructions such as the transmission in front of the seat, so visibility is improved, and the center of gravity is placed approximately at the center of the aircraft in the longitudinal direction, resulting in good longitudinal balance.

In addition, the rotation of the Freon) PTO extraction shaft is the rotation that has already been changed in the transmission, and also passes through the main clutch device, so there is no need to provide a separate device for stopping or decelerating.
This makes it possible to increase the types and uses of front-mounted work equipment.

In addition, the transmission C, the front differential axle device, and the rear differential axle device are separated, and the differential axle devices are arranged in the front and rear, so the length of the transmission case can be shortened, and the differential axle device and rear differential axle device can be separated. The space between them was widened and could be widely used as steps.

In addition, the front differential axle device and rear differential axle device π, which are located apart from the transmission, can be driven and operated independently.
By making it possible to steer and swing, it is possible to switch drive, steering, and swing in a variety of ways, such as when working with the front work machine, when using the abdominal work machine, and when using the rear work machine, making work more efficient. This is what I did.

Furthermore, by making the front and rear differential axle devices common parts, costs are reduced, and the brake device and differential lock device can be used for both the front and rear wheels.

In addition, in order to be able to use the sector shaft 81 rotated by the steering handle 76 as it is to steer the front 152 FQ, the sector shaft 81 is protruded left and right and fixed to the left and right sides of the sector shaft 81. By connecting the pitman arms 77 and 78 and the drag rods 79 and 80, it is possible to construct a four-wheel steering vehicle efficiently in a small space and at low cost.

Furthermore, by attaching and detaching the drag rod 79, it is possible to steer only the front and rear directions, thereby expanding the range of uses.

In addition, in order to enable front and rear four-wheel drive, the front and rear wheel drive shafts 7 are projected forward and backward from the transmission C, and when the rotation after deceleration is projected back and forth by the PTo shaft 6 through the main clutch device in the transmission. , the transmission case 1 becomes longer vertically, the vertical stroke of the mid-mount mower attached to the abdomen becomes smaller, and it interferes with the PTO axis and front and rear wheel drive axles.
The engine flywheel may have a small diameter, but this is an improvement.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the structure for achieving the objects will be explained.

A transmission C is disposed at a substantially central position in the longitudinal direction of the aircraft body, and a rear PTO extraction shaft 6b and a fluorocarbon) PT○ extraction shaft 6a protrude from the transmission C in the longitudinal direction.

Further, the transmission C is arranged approximately in the center of the aircraft in the longitudinal direction, and a front differential axle device and a rear differential axle device are arranged separately from the transmission C, and a front wheel drive shaft 57 and a rear wheel drive shaft protrude from the transmission C in the longitudinal direction. It is configured to transmit power through a wheel drive shaft 58.

Furthermore, the front differential axle device and the rear differential axle device can be independently rotated for steering, rotation for swinging, and driving the axle.

Further, the sector shaft 81 of the steering gear case 55 is protruded left and right, and the left and right protruding portions of the sector shaft 81 are provided with 1. Drag rods 80, 79 are pivotally connected to knuckle arms 82, 83 of front wheels 8, 8 and rear wheels 9, 9.

In addition, in a configuration in which the PTO shaft 6 and the front and rear wheel drive shafts 7 protrude in the longitudinal direction from the transmission C directly connected to the engine E,
The PTO shaft 6 and the front and rear wheel drive shafts 7 are arranged on substantially the same circular arc centered on the clutch shaft 12.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

First, with reference to FIGS. 1 and 2, the overall configuration of the multi-purpose work vehicle of the present invention will be explained.

The fuselage frame 5 supports the entire fuselage, and has a rectangular frame structure.

A transmission C is fixed to the body frame 5, and an engine E is fixed to the rear surface of the transmission C. The radiator 56 of the engine E is arranged at the rear.

Further, a frame cover 4 that covers the transmission bag MC, engine E, and radiator 5G, further covers the front steering case 55, and also serves as a step is placed on the upper surface of the fuselage frame 5. The frame cover 4 is a cover made of FRP resin or the like.

A seat S is arranged above the transmission bag Hc on the upper surface of the acid frame cover 4, and the upper surface of the engine E and radiator 56 is used for luggage! 12 devices H, and the cargo platform H is surrounded by a cargo platform frame 10.

In addition, a front wheel drive shaft 57 and a rear wheel drive shaft 58 protrude from the front and rear of the transmission C, and the shafts inside the case drive the front and rear differential axle devices, driving the front wheels 8, 8 and rear wheels 9, 9. has been done. The front and rear differential axles (D) can use common parts.

The safety frame 3 has a frame structure as disclosed in FIG. Safety frame support frame 47.4 protruding from
It is placed and fixed on top of 7.

This multi-purpose work vehicle is a low-floor, four-wheel drive, four-wheel steering vehicle, and the work equipment can be mounted in three positions: front, abdomen, and rear.

In the embodiment shown in FIG. 1, a forklift device F is installed as a front working device, a mid-mount mower N4 is installed as an abdominal working device, and a rotary tiller R is installed as a rear working device.

The forklift device F changes the inclination angle back and forth by a tilting cylinder 11, and a wire 50 is pulled as the lift arm 38 pivotally supported by the lift hydraulic case 2 rotates.
Forklift' by extending it through the pulley
The AHF lift platform can be moved up and down. In the case of a work machine other than the forklift device F that requires PTO rotation, the front PTO take-out shaft 6 of the transmission C, which will be described later, is used.
It is also possible to drive the front working machine from a through the joint shaft.

Further, the rotary tillage bag HR as a rear working device is supported by a three-point link by a top link 59 and lower links 60, 60, and can be raised and lowered by a lift arm 38. It is also driven via a joint shaft from a rear PTO shaft 41 connected to the rear PTO take-off shaft 6b of the transmission C via a joint shaft.

In addition, the Midmount Mower M, which is used as an abdominal work machine, is the first
As shown in the figure, a guide support rod 54 is pivotally supported at the front end, and the rear part of the mid-mount mower M is pulled by a wire 50 that is suspended by an elevating support rod 53 and linked to the lift arm 38. , a mid-mount mower M is configured to be lifted up by a lifting support rod 53 and a guide support rod 54.

The mid-mount mower M is driven by a pulley 45 fixed to the rear end of the mid-PTO intermediate shaft 42 of the lift hydraulic case 2, and a belt interposed between the pulley 45 and the mid-PTO shaft 43. A mid PTO shaft 43 is driven, and a joint shaft 51 is interposed between the front end of the mid PTO shaft 43 and the bevel gear box 52 of the mid mount mower M.

The mid-PTO shaft 43 has a bearing sleeve 62 fixedly attached to a support plate 61 hanging from the lift hydraulic case 2 and the fuselage frame 5, and is supported by the bearing sleeve 62.

Next, the configuration of the transmission C will be explained with reference to FIGS. 3 and 4.

The front part of the transmission case 1 is closed by a lid body 11, and the rear opening is closed by attaching an engine E. A main clutch device 27 is interposed between the flywheel 28 fixed to the crankshaft 75 of the engine E disposed at the rear of the transmission C and the clutch shaft 12.
The gear 15 at the front end is the fixed gear 1 on the counter shaft 14.
It meshes with 6.

The fixed gear 16 is configured with a fixed gear 19 and two fixed gears, and is loosely fitted onto the counter shaft 14.

By selectively meshing either of the acid twin fixed gears 16 and 19 with either of the sliding gears 17 and 18 on the PTO shaft 6, the PTO can be shifted high or low.

In addition, another fixed gear 63 is mounted on the counter shaft 14.
The gear 15 on the front end of the clutch shaft 12, the fixed gear 19 on the counter shaft 14, and the fixed gear 63 slide on the spline 68 on the transmission shaft 13. By selectively meshing with the gears 20 and 21, high, medium and low sub-shifts are possible.

Also, there is another IM on the gear shift shaft 13! i sliding gear 22.2
3 selectively meshes with either of the loosely fitted double gears 24 and 25 on the counter shaft 14, thereby shifting the main gear forward.
It is possible to change the speed of the two trains.

Also, the sliding reverse gear 30 on the reverse shaft 31 in FIG. It is configured in such a way that this can be done.

24 of the two loosely fitted gears 24 and 25 mesh with the fixed gear 26 on the front and rear wheel drive shafts 7 to drive the front and rear wheel drive shafts 7.

As shown in FIG. 3, the PTO shaft 6 and the front and rear wheel drive shafts 7
has protrusions at the front and rear, allowing PTO drive and traveling drive at either the front or rear. PTO axis 6
The forward protruding portion is the front PT○ take-out l1l16a, and the rear protruding portion is the rear PTO take-out shaft 6b.

Further, the forwardly projecting portion of the front and rear wheel drive shaft 7 is the front front and rear wheel drive shaft 7a, and the rearward projecting portion is the rear front and rear wheel drive shaft 7b.

A front wheel drive shaft 57 is connected to the front end of the front front and rear wheel drive shaft 7a, and is connected to a differential pinion shaft 69 of a front differential axle device. Further, a rear wheel drive shaft 58 is connected and extended to the rear end of the rear front and rear wheel drive shaft 7b, and is connected to a differential pinion shaft 69 of a rear differential axle device.

The PTO shaft 6 and the front and rear wheel drive shafts 7 are arranged at the bottom of the transmission case 1, but as shown in FIG. The diameter of the flywheel 28 is made large, and the vertical stroke of the mid-mount mower M is made large.

As shown in FIG. 4, the main shift lever 29 controls the shifter 32 of the sliding reverse gear 30 and the dual sliding gear 22.
The shifter 33 is configured to select and operate one of the 23 shifters 33, and a shifter 36 that slides the dual sliding gears 20 and 21 is operated by an auxiliary transmission arm 34.

The auxiliary gear shift and the main gear shift enable six forward gears and three reverse gears.

Further, the shifter 37 is moved back and forth by the PTO speed change lever 35, and the double sliding gears 17 and 18 are moved back and forth, thereby making it possible to change the PTO speed up and down.

Next, the configuration of the differential axle device will be explained with reference to FIGS. 5 and 6.

The differential axle device allows the use of a common device for the front wheels 8, 8 and the clutch drive device, and the power of the PTO shaft 6 is transmitted through the front wheel drive shaft 57 and the rear wheel drive shaft 58.
Differential pinion shaft 69 installed in the front and rear differential axle devices
is being communicated to.

A differential gear device 65, a differential lock device 66, and a steering brake device 67 are arranged inside the differential axle device, and a steering rotating bevel gear is provided at the king pin portion to enable turning rotation. A case 64 is arranged.

Since the differential pinion shaft 69 is pivoted to the fuselage frame 5 with the center pin position, the left and right ends of the differential axle VD itself can be swung up and down.

However, it is possible to switch the swing, steering, and drive, either all or individually.

Next, the structure of the lift hydraulic case 2 will be explained with reference to FIGS. 7 and 8.

A hydraulic cylinder 49 is arranged outside the lift hydraulic case 2, and the hydraulic cylinder 49 is connected to the lift arm 3.
It is pivotally supported by a pivot pin 39 at the lower end of 8. Therefore, the lift arm 38 moves up and down as the hydraulic cylinder 49 expands and contracts, and a wire 50 for raising and lowering the mid-mount mower M is also connected to the lower end of the lift arm 38.

In addition, an elevation control pulp ■ is arranged inside the lift hydraulic case 2, and the lift arm 3
It is configured to work in conjunction with 8.

The hydraulic oil that moves up and down the hydraulic cylinder 49 is obtained by suctioning the lubricating oil inside the lift hydraulic case 2 from the strainer 72, transporting it through a pipe 71 to the hydraulic pump on the side of the engine E, and converting it into pressure oil. It returns to the elevation control pulp V.

The pressure oil discharged from the lift control pulp V is flowing down into the lift hydraulic case 2 again.

In addition, the lift hydraulic case 2 supports two shafts, a rear PTO shaft 41 and a mid PTO intermediate shaft 42, and the rear PTO shaft 41 is a PTO shaft for a rear-mounted work machine such as a rotary tiller "ffR". The mid PTO intermediate shaft 42 is a shaft that transmits power to the mid PTO shaft 43 supported by the lower bearing sleeve 62 via pulleys 45 and 46 and a belt.

The rear PTO shaft 41 is a PTO shaft that protrudes rearward from the transmission = C.
It is connected to the rear end of the TO shaft 6 via a join 1 shaft 73 as shown in FIG. 9, and the filtered rotation from the rotation of the engine E is transmitted thereto.

On the other hand, the mid PTO intermediate shaft 42 transmits power for a high-speed rotating work machine such as the mid mount mower M, and the rotation of the engine E before entering the transmission C is transmitted to the crankshaft. Take it out from 75 and attach the joint shaft 74.
It is configured so that it can be transmitted via.

Therefore, although it is also supported by the lift hydraulic case 2, the rotation of the rear PTO shaft 41 is slow, and the rotation of the rear PTO shaft 41 is slow.
The rotation of the TO intermediate shaft 42 is as fast as the rotation of the engine E.

FIG. 10 is a view showing the front and rear wheel spacing device.

The steering handle 76 rotates a bevel gear within the steering gear case 55 and drives a sector shaft 81 that protrudes left and right from the steering gear case 55. Pitman arms 77 are provided on the left and right sides of the sector axis 81.
・78 is fixedly installed and can be rotated back and forth.

The pitman arm 77 rotates the knuckle arms 82 of the front wheels 8 through a drag rod 80, and the pitman arm 78 rotates the knuckle arms 82 of the front wheels 8 through a drag rod 79.
The knuckle arm 83 of No. 9 is rotated back and forth.

If you wish to steer only the front wheels, remove the joints between the pitman arm 78 and the drag rod door 9, and fix the drag rod 79 to the fuselage frame 5. It is possible to switch to a positive state. Conversely, by removing the drag rod 80 from the pitman arm 77, it is also possible to configure the vehicle so that only the rear wheels are steered and the front wheels are not steered.

FIG. 11 shows the shape of the safety frame 3.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

By configuring as claimed in claim (1), the front PT
There is no need to install a reducer or clutch device in order to extract power from the engine crankshaft through the O-axis and reduce or stop the rotation. This makes it possible to extract the rotation to the front working machine.

In addition, the transmission is placed in the center of the aircraft in the longitudinal direction, and the seat is placed above it to lower the seat, allowing the front, abdomen, and
Since the work equipment is located at the rear, it is possible to place the work equipment efficiently.There are no obstructions such as transmissions in front of the seat, so visibility is good, and the center of gravity is located approximately at the center of the aircraft in the longitudinal direction. It was possible to achieve a good front-to-rear balance by providing this.

Since the structure is configured as claimed in claim (2), the length of the transmission case can be shortened, and the space between the differential axle device and the transmission device can be widened and used widely as a step.

Furthermore, by making the front and rear differential axle devices a common part, costs are reduced and the brake device and differential lock device can be used for both the front and rear wheels.

As claimed in claim (3), since the front differential axle device and the rear differential axle device, which are arranged separately from the transmission, can be driven, steered, and swung independently, when working with the front work machine, The work can be carried out efficiently by variously switching between the abdominal work machine and the rear work machine, as well as drive, steering, and swing.

For example, it can be used in various ways as follows.

When the lift device F is used as a front working device, both the front and rear wheels are driven, the steering is performed by only the rear wheels to enable tight turning, and the swing is performed only by the rear differential axle Wp to improve the stability of the front portion.

In addition, when attaching the Midmount Moa M to the abdomen,
It is driven by front and rear wheel valves, steering is performed by the front and rear wheels to enable tight turning, and only the front wheels swing to maintain a constant cutting height.

In addition, when installing the low tillage device R on the rear, the front and rear wheel valves are driven, and the direction of the oak is performed using only the front wheels, and the swing is also made only at the front so that no lateral stress is placed on the tilling claws. It can be done.

As in claim (4), the sector shaft 81 of the steering gear case 55 projects left and right, and the knuckle arms 8 of the front wheels 8, 8 and the rear wheels 9, 9 are attached to the left and right projections of the sector shaft 8.
Since the drag rods 80 and 79 connected to 2 and 83 are pivotally connected, the sector shaft 81 can be used as is to steer the front and rear wheels, allowing efficient 4-wheel steering in a small space and at low cost. It was possible to construct a vehicle.

In addition, by simply attaching and detaching the drag rod 79, it is possible to perform forward and backward steering, thereby expanding the range of uses.

According to claim (5), in order to enable front and rear four-wheel drive, the front and rear wheel drive shafts protrude front and rear from the transmission, and the transmission rotates the rotation after deceleration through the main clutch device r and the PTO shaft back and forth. If the transmission case protrudes vertically, the transmission case will become longer vertically, and the vertical stroke of the mid-mount mower attached to the abdomen may become smaller. Also, since it will interfere with the PTO shaft and front and rear wheel drive shafts, the engine However, in the present invention, the flywheel of P
By arranging the TO shaft 6 and the front and rear wheel drive shafts 7 on substantially the same circular arc centered on the clutch shaft 12, this problem can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a side view of the multi-purpose work vehicle of the present invention, FIG. 2 is a plan view, FIG. 3 is a side sectional view of the transmission C, FIG. 4 is a partial front sectional view of the transmission C, and FIG. Figure 5 is a front sectional view of the differential axle device, Figure 6 is a side view, Figure 7 is a front view of the lift hydraulic case 2, Figure 8 is a side sectional view, and Figure 9 is a mid-mount. FIG. 10 is a plan view showing the four-wheel steering mechanism, and FIG. 11 is a perspective view of the safety frame 3. C...Transmission device D...Differential axle device E...Engine F...Lift device M...Mitsudou mount mower R...Rotary plowing device 6...PTO shaft 6a... Front PTO takeout shaft 6b...Rear PTO takeout 7...Front and rear wheel drive shaft 1...Transmission case 8.8...Front wheel 9.9...Rear wheel 12...Clutch shaft Applicant Yanmar Diesel Co., Ltd. Representative Patent Attorney Hisashi Yano

Claims (5)

[Claims] (1) The transmission C is arranged at a substantially central position in the longitudinal direction of the aircraft, and the rear PTO extraction shaft 6b extends from the transmission C in the longitudinal direction.
and a multi-purpose work vehicle characterized by having a protruding front PTO take-out shaft 6a. (2), the transmission C is arranged approximately in the center of the aircraft in the longitudinal direction,
The present invention is characterized in that a front differential axle device and a rear differential axle device are arranged separately from the transmission device C, and power is transmitted through a front wheel drive shaft 57 and a rear wheel drive shaft 58 that protrude from the transmission device C forward and backward. Multi-purpose work vehicle. (3), the transmission C is placed approximately in the center of the aircraft in the longitudinal direction;
A front differential axle device and a rear differential axle device are arranged separately from the transmission C, and configured to transmit power through a front wheel drive shaft 57 and a rear wheel drive shaft 58 that protrude front and rear from the transmission C, and the front differential axle device and rear differential axle device independently, steering rotation, swing rotation,
A multi-purpose work vehicle characterized by being able to drive its axles. (4) Sector shaft 81 of steering gear case 55
A multi-purpose work vehicle characterized in that track rods 80 and 79, which are connected to knuckle arms 82 and 83 of front and rear wheels 8 and 9, are pivotally connected to the left and right protrusions of the sector shaft 81. (5) In a configuration in which the PTO shaft 6 and the front and rear wheel drive shafts 7 protrude in the longitudinal direction from the transmission C directly connected to the engine E, the PTO shaft 6 and the front and rear wheel drive shafts 7 are centered around the clutch shaft 12. A multi-purpose work vehicle characterized by being arranged on approximately the same arc.