JP3080789B2 - Passenger work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-wheel-drive passenger work vehicle having a main clutch and a side-clutch type differential mechanism in a rear-wheel drive unit.

[0002]

2. Description of the Related Art Conventionally, transmission to a traveling device is intermittently performed by a main clutch, and a side clutch type or differential type differential mechanism is interposed on left and right rear wheel drive shafts to link front and rear wheels in an interlocking manner. Wheel-driven passenger work vehicles are already known.

[0003]

Among the known passenger work vehicles, those in which the differential mechanism of the rear wheel drive unit is of a side clutch type have better straightness than the differential type and have a power loss during turning. However, if the left and right side clutch pedals are depressed simultaneously to stop the aircraft when traveling on the road, the transmission to the left and right rear wheel drive shafts is cut off by separate side clutches, and then the rear brake Is activated and the rear wheels stop, but the front wheels are not braked, which is dangerous if the road surface is concrete and downhill.

[0004]

According to the present invention, a front wheel drive shaft 1 is provided.
Traveling device in which the rear wheel 6 and the rear wheel transmission shaft 20 are linked and connected,
Main clutch that interrupts transmission to the device, and rear wheel transmission
Left and right rear wheel drive shafts 23a, 23 driven by the drive shaft 20
b, in the four-wheel-drive passenger work vehicle having a side clutch type differential mechanism interposed, the rear wheel drive shafts 23a, 23
3b, the input gear 22 of the differential mechanism for transmitting power to the left and right
Side clutches 27a and 27b are provided so as to be able to engage and disengage.
And interlock with the side clutches 27a and 27b.
Side brakes 30a and 30b are provided, and
Between the clutch and the input gear 22, the two are disengaged.
The brake clutch 33 is interposed, and the brake clutch 3
3 interlockingly connected to the main clutch pedal, brake clutch 33 is entered when the cut of the main clutch 12 gear 2
When the main clutch is depressed, the main clutch is disengaged, and both side clutches of the rear wheel drive shaft are disengaged and braking is performed, so that the brake clutch is engaged and the front wheel drive shaft also stops. Thus, the above-described problem has been solved.

[0005]

When the vehicle is stopped on the road, when the main clutch pedal is depressed, the transmission to the traveling device and the work machine is cut off. When both side clutch operating members are turned off, the left and right side clutches are disengaged. , Respectively, the brakes operate. At that time, depressing the main clutch pedal causes the brake clutch to engage the input gear, and the two are integrated, so the front wheel drive shaft linked to the rear wheel transmission shaft also stops, and eventually the front and rear wheels In either case, the vehicle is braked.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a riding rice transplanter shown in the drawings.
Also, the rear wheels 3, 3 are pivotally supported on both sides of the rear, a transmission case 4 is arranged between the front wheels 2, 2, an engine 5 is mounted on an upper part thereof, and a driver's seat 6 is provided on an upper part near the rear, The planting device 8 is attached to the column 7 with the top link 9 and the lower link 10, 10.
Are connected so as to be able to move up and down.

[0007] A main clutch 12 is interposed on the input shaft 11 of the transmission case 4, and a gear attached to the cylinder shaft is connected to a traveling transmission system and a work machine transmission system, and the work machine transmission shaft 13 is provided with a planting device. 8, the final transmission shaft 1 of the traveling transmission system
5 is transmitted to a ring gear 18 of a front wheel differential mechanism 17 and a bevel gear of a rear wheel transmission shaft 20 interposed on the front wheel drive shafts 16, 16.

In the rear axle case 21, an input bevel gear 22 serving as a center gear and a pair of left and right rear wheel drive shafts 23a and 23b each having an inner end inserted through a shaft hole thereof are supported.
Gears attached to both ends drive the axles of the rear wheels 3 and 3 via a plurality of reduction gears. The input bevel gear 22 has a clutch claw 25 on the end face of the boss and a radius on the end face of the gear. The left and right side clutches 27a and 27b spline-fitted to the center of the rear wheel drive shafts 23a and 23b are provided at the inner ends of the left and right clutches 25 and double clutch pawls. clutch pawls 28a that meshes with the shaft center side of the 26, engraved and 28b, the side clutch 27a, de the outer end of the 27b is urged pressed by the compression spring inwardly disc type parking brake 3
The bosses 0a and 30b are in contact.

The one side clutch 27a
Has a clutch claw 31 at its inner end, which engages with and disengages from the outer periphery of the double clutch claw 26.
For example, the brake clutch 33 urged by 2 is spline-fitted so as to rotate integrally but slide in the axial direction.

The left and right brake pedals 36 and 37 adjacent to the brake petal shaft 35 supported near the front of the fuselage are fixed, and the right one is rotatably mounted on the left and right. An arm 38 protrudes, and this arm 38 is operatively connected to a brake arm 39 attached to the side clutch 27a by a rod 40, and an arm 41 rising from the boss of the right brake pedal 37 is attached to the side clutch 27b by a rod 42. The right arm 48 protruding from a clutch petal shaft 47 to which a clutch pedal 46 is attached is connected to the clutch arm of the main clutch 12 by a rod 50, and the left arm protrudes to the left. 5
1 is connected to a clutch arm 52 attached to the brake clutch 33 via a rod 53 and a spring 54.

[0011] When one of the brake pedals 36, 37 is depressed shallowly while working with the above-mentioned passenger work vehicle, the side clutch 27a,
Or 27b is disengaged and the transmission to the rear wheel 3 on that side is cut off, so that the traveling direction can be corrected, and when the pedal is fully depressed, the side brake is activated after the side clutch is disengaged and the rear side of that side is actuated. Since the wheel 3 is stopped, the aircraft can circulate with a small turning radius. Also, when driving on the road,
When the clutch pedal 46 is depressed to disengage the main clutch 12 and the adjacent left and right brake pedals 36 and 37 are simultaneously fully depressed to operate the left and right side brakes 30a and 30b, the left and right side clutches 27a are stopped. , 27b are turned off, the left and right brakes are actuated, and the depression of the clutch pedal 46 causes the clutch arm 52 to rotate, causing the brake clutch 33 to slide toward the center against the spring 32 and the clutch pawl 31 to move. The double clutch pawl 26 meshes with the outer periphery of the double clutch pawl 26 and becomes integral with the input bevel gear 22, so that the final transmission shaft 15 in the transmission case 4 does not rotate, and the brake is applied to the front wheel drive shafts 16 and 16 which are interlocked and connected thereto. The road surface is slippery as if it were concrete, and the vehicle faces downhill on the front wheels. Without a large load to slip even when the loaded Te can be reliably stopped.

As in the above-described embodiment, the brake clutch 3
If 3 is mounted on only one side clutch 27a, the structure can be simplified, and the operation can be performed more reliably without a shift in the operation timing than those mounted on both. Further, since the spring 54 is interposed at the rear end of the rod 53, the brake clutch 33 can be reliably operated even if the operation amount of the clutch arm 52 is different from the operation amount of the main clutch. Further, the double clutch pawl 26 engraved on the input bevel gear 22 serving as the center gear can be shared only by lengthening it in the radial direction. When the side clutch 27a on that side is disengaged, the brake clutch 33 can be used. Since it is biased by the spring 32, it does not mesh with the double clutch pawl 26.

[0013]

According to the present invention, the front wheel drive shaft 16 and the rear wheel transmission shaft
20 and a traveling device linked to the traveling device, and transmission to the traveling device.
Drive from the intermittent main clutch and rear wheel transmission shaft 20
Power is transmitted to the rear wheel drive shafts 23a and 23b in a four-wheel drive type passenger work vehicle in which a side clutch type differential mechanism is interposed between left and right rear wheel drive shafts 23a and 23b to be moved.
The input gear 22 of the differential mechanism
The hooks 27a and 27b are provided so as to be able to engage and disengage with each other.
Side brake linked to id clutches 27a, 27b
30a and 30b, and engage with the side clutch.
Between the force gears 22, there is a brake clutch for engaging and disengaging the two.
The main clutch 12 is disengaged by interlocking the brake clutch 33 with the main clutch pedal.
Sometimes the brake clutch 33 is engaged with the input gear 22.
Having urchin configuration, by operating the left and right brake pedals, turn off the one side clutch 27a, yet one which can be steering maneuver or brake the hand brake in this state, when the road When the main clutch 12 is disengaged and the left and right side brakes are operated for braking, the brake clutch 33 is engaged with the disengagement of the main clutch 12 and enters the center gear which is interlocked with the front wheel drive system, and they are integrated. As a result, the brakes can be applied to the front wheel drive system. It is possible to stop the vehicle securely and safely without stopping.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of the steering operation device.

FIG. 3 is a transmission system diagram.

FIG. 4 Rear axle case (right side clutch disengaged)
FIG.

FIG. 5 is a plan view partially broken away from the above.

FIG. 6 is a sectional view of the same left clutch disengaged state.

FIG. 7 is a cross-sectional view showing a state in which both side clutches are disengaged and a brake clutch is engaged.

[Explanation of symbols]

 2 front wheel 3 rear wheel 15 final transmission shaft 16 front wheel drive shaft 20 rear wheel transmission shaft 22 input bevel gear 23a, 23b rear wheel drive shaft 25 clutch pawl 26 double clutch pawl 27a, 27b side clutch 28a, 28b clutch pawl 30a, 30b clutch Claw 33 Brake clutch 36, 37 Brake pedal 46 Clutch pedal

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B60K 41/24 B60K 17/344 B62D 6/00

Claims (1)

(57) [Claims] 1. A front wheel drive shaft 16 and a rear wheel transmission shaft 20 are connected.
A traveling device connected to the vehicle, and a mechanism for interrupting transmission to the traveling device.
The left side driven from the in-clutch and the rear wheel transmission shaft 20
In a four-wheel drive type passenger work vehicle in which a side clutch type differential mechanism is interposed on the right rear wheel drive shafts 23a and 23b, a differential for transmitting power to the rear wheel drive shafts 23a and 23b.
The left and right side clutches 27 are connected to the input gear 22 of the driving mechanism.
a and 27b are provided so as to be able to be disengaged and disengaged.
Side brake 30 linked to latches 27a, 27b
a, 30b, and the side clutch and input teeth
Between the cars 22, a brake clutch 3 for engaging and disengaging the two
3 interposed, in conjunction coupling the brake clutch 33 to the main clutch pedal, riding work vehicle, characterized in that the brake clutch 33 is configured to engage the input gear 22 when cutting the main clutch 12.