JPH065246Y2 - Defrosting device for mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a front wheel differential lock release device applicable to mobile agricultural machines such as tractors and riding rice transplanters. The present invention relates to a diff lock releasing device for a mobile agricultural machine, which is brought into a diff lock state by steering, and is brought into a differential state by turning operation of a machine body.

[Prior art]

This type of conventional tractor / passenger rice transplanter adopts a four-wheel drive system in which both front and rear wheels are driven, and the front and rear wheels have a differential mechanism (hereinafter simply referred to as a differential mechanism). It is driven from the engine respectively. This diff mechanism has a diff lock state that prevents the aircraft from meandering and improves straight running performance, and a differential state that releases this diff lock state and facilitates normal road traveling and aircraft turning. A diff lock mechanism for switching is attached.

[Problems to be solved by the invention]

However, when switching the diff mechanism by manual (or foot movement) operation so that the diff mechanism is in the diff lock state when the aircraft is traveling straight and is in the diff lock release state when the aircraft is traveling, The switching operation of (1) is accompanied by a lifting operation of the working machine performed at the same time as this switching operation, and the operation timings thereof are interrelated, so there is a problem that the switching operation is very troublesome.

There is an automatic type that eliminates the disadvantages of this type of manual type, but this automatic type is automatically generated by the torque difference between the left and right front wheels when the aircraft is traveling or traveling on the road. Because the differential lock state is set, the traveling range is narrow in the differential state where there is no torque difference between the left and right front wheels when the aircraft is traveling, and the tires are forced to slip. Had the drawback of being particularly intense.

On the other hand, conventionally, a switching lever for connecting and disconnecting power to the front wheels,
Since a switch and a lever for switching between the operating state and the non-operating state of the differential mechanism were provided independently of each other, the number of parts was increased and the operation thereof was very troublesome.

Therefore, the present invention was devised to solve the above-mentioned conventional problems.The diff mechanism is brought into the diff-lock state by the straight-ahead steering of the body, and the diff-lock state of the diff mechanism can be released by the turning operation of the body. It is an object of the present invention to provide a diff lock releasing device for a mobile agricultural machine, which can easily perform the operation of connecting / disconnecting power to the front wheels and switching the operating / non-operating state of the diff mechanism in an interlocking manner and reduce the number of parts.

[Means for solving problems]

The differential lock release device for a mobile agricultural machine according to the present invention to achieve the above object is a mobile agricultural machine configured to be steerable by a steering mechanism in which a pair of left and right front wheels driven via a differential mechanism are connected by a tie rod. The diff mechanism is configured to switch between a diff lock state when the tie rod is detected and a diff lock release state when the tie rod is not detected, and the diff mechanism is switched between the actuated and deactuated states of the diff mechanism at the same time. When a switching lever for connecting / disconnecting the power to the front wheel is provided by switching the switching lever, the diff mechanism is deactivated regardless of whether the tie rod is detected or not. , When the steering mechanism is turned in a diff-locked state under power transmission to the front wheels, the diff-locked state of the diff mechanism is released. It is characterized in that it has to be.

[Operation] Therefore, by operating the switching lever, it is possible to switch between the operating state and the non-operating state of the differential mechanism at the same time when the power to the front wheels is interrupted. Furthermore, the diff mechanism that drives the front wheels can be switched between a diff lock state and a diff lock release state by detecting the position of the tie rod that is displaced by operating the steering mechanism, and the diff mechanism is restricted to the diff lock state by steering the aircraft straight. Therefore, it is possible to satisfactorily perform straight traveling of the airframe. Also, since the diff lock state of the diff mechanism is released by the steering operation of the airframe by the steering mechanism, the traveling range in the differential state of the front left and right wheels can be widened,
It is possible to prevent forced slippage of the tire and reduce wear of the front tire.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment.

FIG. 1 is a power transmission path diagram of a differential mechanism for driving front wheels, FIG. 2 is a schematic plan view of a front axle, FIG. 3 is an electric circuit diagram, and FIG. 4 is an overall side view of an agricultural tractor.

In FIG. 4, reference numeral 1 denotes an agricultural tractor, a hood 3 for covering the engine 2 is provided in front of the agricultural tractor 1, a steering wheel 4 is arranged behind the bonnet 3, and a driver's seat 5 is provided behind this. Is provided.

A clutch housing 6 is integrally connected and fixed to the rear of the engine 2, and a front portion of a transmission case 7 extending rearward is integrally connected and fixed to the rear of the clutch housing 6, and extends forward and backward for agricultural purposes. Tractor 1
The airframe 9 is constructed. Behind the mission case 7, a pair of left and right rear wheels 11 arranged so as to be positioned on the left and right sides of the driver's seat 5 are pivotally supported.
A front wheel drive shaft 12 whose rear is supported extends forward and is supported by an axle housing 13 for the front wheels. The axle housings 13 are fixed to both sides of the engine 3 and fixed to a chassis 14 extending forward. Behind the mission case 7 is a lift arm 15 on the upper side and a lower link on the lower side.
16 is provided, a lift rod 17 that connects the lift arm 15 and the lower link 16 is provided, and further a top link 18 that is pivotally connected to the hitch is provided. This working machine is configured to move up and down as the lift arm 15 is hydraulically moved up and down.

A diff mechanism 20 for driving the front wheels is installed in the axle housing 13, and the diff mechanism 20 is configured as follows. That is, 21 is a bevel gear integrally fixed to the differential case 22, and this bevel gear 21 is driven from the mission case 7 by meshing with a bevel gear 23 fixed to the shaft end of the front wheel drive shaft 12. Both ends of the differential case 22 are supported through left and right bearings (not shown), and a clutch portion 25 for connecting and disconnecting the left and right differential shafts 24, 32 and the differential case 22 is provided at one end thereof.

Inside the differential case 22, differential pinions 27, 29 rotatably mounted on a shaft 26 fixed to the differential case 22,
Differential gears 30 and 31 that mesh with the differential pinions 27 and 29 are provided. One of the differential gears 30 and 31 is spline-fitted to the left differential shaft 32, and the other differential gear 31 is spline-fitted to the right differential shaft 24. The diff shafts 24, 32 are supported on the other end side of the axle housing 13 via bearings (not shown).

The bevel gears 33 fixed to the shaft ends of the differential shafts 24 and 32 respectively mesh with the upper bevel gear 34 fixed to the vertical axis 35 shared by the king pins, and fixed to the vertical axis 35. Front bevel gear 36 on which the lower bevel gear 36 supports the front wheel 40
The left and right front wheels 40, 40 are driven by the differential mechanism 20 into a differential state by meshing with the fixed bevel gear 39.

The differential mechanism 20 includes a differential lock mechanism 45 for switching the differential mechanism of the front wheels between a differential lock state and a differential state.
Are opposed to each other, and the differential lock mechanism 45 is as follows. That is, the clutch portion 25 provided at one end of the differential case 22 is provided with the clutch plate 41 facing the clutch portion 25 so as to be slidable only on the differential shaft 24. The coil 43 is provided opposite.

Further, the left and right front wheels 40, 40 are configured to be steerable about a vertical axis 35 shared with the kingpin. That is, below the both sides of the axle housing 13, right and left swing cases 46, 46 that respectively support the front axle 37 and bevel gears 36 and 39 and swing around the respective vertical axes 35.
The left and right knuckle arms 47, which are integrally fixed to the rocking cases 46, 46, are pivotally connected by a tie rod 49. The tie rod 49 is interlockingly connected to the steering wheel 4 via a connecting mechanism (not shown), and the left and right front wheels 40, 40 can be steered by operating the steering wheel 4.

The tie rod 49 is provided with a proximity switch 50 that is provided on the machine body so as to be adjustable in the front-rear position and fixed. The proximity switch 50 and the electromagnetic coil 43 described above are connected to a power source 51 by an electric circuit shown in FIG. 52 in the figure.
Is a key switch, and 53 is a changeover switch. This changeover switch 53 is a changeover mechanism inside the transmission case 7 (not shown).
To the switching lever 54 that is switchably fixed to switch the power of the front wheel drive shaft 12 to the ON state when the front wheel drive shaft 12 is in the "ON" position by operating the switching lever 54. It is placed opposite to the OFF state at the "cut" position.

Then, in the drive state of the front wheel drive shaft 12 in which the switching lever 54 is operated to the “ON” position, the changeover switch 53 is also in the ON state at the same time, so that the steering wheel 4 is steered in the straight traveling direction of the vehicle body. Is driving straight ahead,
Since the tie rod 49 connecting the left and right front wheels 40, 40 approaches the proximity switch 50 as shown by the solid line in FIG. 3, the proximity switch 50
Is turned on, a current flows through the electromagnetic ring 43 through the electric circuit, and the electromagnetic ring 43 operates. By the operation of the electromagnetic ring 43, the clutch plate 41 constituting the diff lock mechanism 45 and the clutch portion 25 of the diff case 22 are restricted to the diff lock state with no rotation difference, so that a traction force is required and the meandering of the machine body that prevents meandering is required. When traveling straight ahead, the left and right front wheels 40, 40 are regulated and driven in a diff lock state.

On the other hand, when the steering wheel 4 is steered to the turning state of the body and the body is turning, the tie rod 49 connecting the left and right front wheels 40, 40 as shown by the dotted line in FIG.
Since the proximity switch 50 is turned off by separating from 50, no current flows in the electromagnetic ring 43, and the diff lock state by the diff lock mechanism 45 is automatically released. That is, when the electromagnetic ring 43 is turned off, the clutch plate 41 and the diff case 22 that form the diff lock mechanism 45.
Since the clutch 25 is disconnected from the clutch unit 25, and a differential state in which there is a rotation difference between the two, the left and right front wheels 40,
The 40 rotates while being driven in the differential state by the differential mechanism 20, and the range of rotation of the front wheels 40 in the differential state is expanded to prevent forced slip of the front tires.

As described above, since the position of the tie rod 49 is changed by the operation of the steering wheel 4, the proximity switch 50 for detecting the position of the tie rod 49 should have its front and rear positions adjustable and fixed to the tie rod 49. This makes it possible to switch the diff mechanism 20 between the diff lock state and the diff lock release state at a desired operation angle of the front wheels 40 by this adjustment, so that the differential range of the diff mechanism 20 at the time of traveling can be widened. There is an advantage, and it is not necessary to provide the proximity switches 50 on both the left and right sides, and there is an advantage that the operating angle of the front wheel 40 in the left and right direction can be detected only by providing one pair on the tie rod 49.

Further, by operating the changeover lever 54 to the “OFF” position, the front wheel drive shaft 12 is brought into a non-driving state, and at the same time, the changeover switch 53 is turned off and the electromagnetic coil 43 is turned off.
Since the electric circuit linked to is automatically turned off, the single switching lever 54 is used to disconnect the interlocking state with the diff lock mechanism 45 by operating the steering wheel 4, and the front wheel in the non-driving state. 40, 40 can also be used for simultaneous switching to the idling state via the differential mechanism 20. As a result, the members such as the switch and the switching lever for switching to the differential lock release state by disconnecting the interlocking with the turning operation can be used for the front wheel drive shaft.
There is an advantage that the structure is simplified because it is not necessary to provide it separately from the switching lever 54 that connects and disconnects 12.

Next, as shown in FIG. 4, the agricultural tractor 1 is provided with a clutch pedal 55 for connecting and disconnecting a main clutch (not shown) provided in the clutch housing 6, and a main pedal is provided near the clutch pedal 55. A changeover switch 60 is provided for changing over the speed change lever 56 between the forward drive position and the reverse drive position. As shown in detail in FIGS. 5 and 7, the changeover switch 60 is fixed to a bracket 59 fixed to the deck plate 57 at a position where it can be depressed in conjunction with the depression operation of the main clutch pedal 55. There is.

As shown in FIG. 4, a shift lever 56 is provided on the side of the cockpit 5 so as to be swingably fixed in the front-rear direction about the support shaft of the mission case 7.
Is connected to a transmission gear (not shown) in the transmission case via a connecting rod. As shown in FIG. 6, a mounting seat 61 is fixed to the gear shift lever 56 in a direction projecting in the front-rear direction, and solenoids 63 and 64 each having an operating rod 62 are attached to the transmission case 7 at a neutral position of the gear shift lever 56. The operating rods 62 are pivotally connected to the mounting seat 61 of the speed change lever 56 via the connecting rods 65, respectively.

The solenoids 63 and 64 and the changeover switch 60 described above are connected to a power source 66 via an electric circuit shown in FIG.
In this electric circuit, 67 is a latching relay and 69 is a key switch.

As shown in FIG. 7, when the main clutch pedal 55 is depressed and the switch 60a of the changeover switch 60 is depressed at the same time, the main clutch is disengaged and a current flows through the latching relay 67 at the same time.
Switches in the direction opposite to that before shifting, and the solenoid 63
(Or 64) is actuated to automatically move the speed change lever 56 to the side opposite to that before the speed change, so that the forward and backward movements of the machine (like when performing work with the front loader optionally attached in front of the agricultural tractor ( When there are many repeated operations (shuttle speed change), the loss time due to manual operation of the speed change lever 56 can be reduced as much as possible.

Further, when the forward / backward shift operation by the shift lever 56 is not necessary, the normal operation can be performed by depressing only the main clutch pedal 55, regardless of the changeover switch 60. .

[Effects of the Invention] As described above, the present invention provides the differential mechanism for driving the front wheels,
By detecting the position of the tie rod displaced by the operation of the steering mechanism, it is possible to switch between the diff lock state and the diff lock release state, and the diff mechanism is set to the diff lock state by the straight-ahead steering of the aircraft to improve the straight running of the aircraft. In addition, it is possible to release the diff lock state of the diff mechanism by the turning operation of the aircraft, and to widen the turning range in the differential state of the left and right front wheels, preventing forced slipping of the tires and front tires. Not only can the wear of the front wheel be reduced, but the switching lever that connects and disconnects the power to the front wheels can be used to switch between the operating state and the non-operating state of the diff mechanism at the same time when the power to the front wheels is interrupted. When the switching lever is switched to disconnect the tie rod, the diff mechanism is automatically turned off regardless of whether the tie rod is detected or not. As a dynamic state, it is possible to drive smoothly with rear wheel drive, and it is not necessary to separately provide members such as a switch and a switching lever for releasing the diff lock state which is a harmful effect when traveling on the road, and due to forgetting operation It is possible to prevent the vehicle from running in the differential lock state. In addition, the number of parts can be reduced by the amount that the above mechanism is simplified.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a power train diagram of a diff lock mechanism for driving front wheels, FIG. 2 is a schematic plan view of a front axle showing arrangement of tie rods and proximity switches, and FIG. FIG. 4 is a circuit diagram, FIG. 4 is an overall side view of the agricultural tractor with a part broken away, FIG. 5 is a vertical cross-sectional side view showing the arrangement of a main clutch pedal and a changeover switch, and FIG. FIG. 7 is a side view showing the operation of the main clutch pedal and the changeover switch is depressed, and FIG. 8 is an electric circuit diagram. 1 ... Agricultural tractor, 4 ... Steering wheel, 20 ... Differential mechanism, 25 ... Clutch part, 40 ... Front wheel, 41 ... Clutch plate,
43 ... Electromagnetic coil, 45 ... Differential lock mechanism, 49 ... Tie rod, 50 ... Proximity switch, 53 ... Changeover switch, 54 ... Changeover lever.

Claims (1)

[Scope of utility model registration request] 1. A mobile agricultural machine in which a pair of left and right front wheels driven via a diff mechanism are steerable by a steering mechanism connected via a tie rod, wherein the diff mechanism (20) is used for detecting a tie rod. It is configured to switch between the diff lock state and the diff lock release state when the tie rod is not detected, and further, the diff mechanism (20) is switched between the operating and inactive states of the diff mechanism (20) and at the same time the front wheel (40 ) Is provided with a switching lever (54) for connecting and disconnecting the power, and when the power to the front wheels (40) is set to the `` disconnected '' state by switching the switching lever (54), it is related to detection and non-detection of the tie rod. Without turning the diff mechanism (20) into the non-operation state, and when the steering mechanism (4) is turned in the diff lock state under power transmission to the front wheels (40), the diff mechanism (20) Mobile farms that release the diff lock state Diff lock release device for machine.