JP2587616Y2 - Passenger work vehicle braking device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a passenger work vehicle equipped with side clutches and side brakes in drive units for left and right rear wheels.

[0002]

2. Description of the Related Art Conventionally, riding work machines in which side clutches and side brakes are provided in drive units for left and right rear wheels are already known.

[0003]

The known riding work machine is configured such that when stopping the body, the left and right side clutches are disengaged and then the side brake is braked. In some cases, only the rear wheels are braked and the front wheels are free, so if the body weight is heavily loaded on the front wheels as on a downhill, the vehicle slips and is dangerous.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a riding work machine in which a side clutch A and a side brake B are respectively mounted on left and right rear wheel driving units, and a front wheel and a rear wheel are interlocked and connected to each other. The clutch shafts 30 and 30 are interlockedly connected to both sides of the distribution shaft 23 driven by the clutches via a side clutch A and a side brake B, respectively, and the left and right clutch arms for operating the left and right side clutches A and B are mutually connected. And a linkage member, and a linkage mechanism is interlocked with each of the separate brake pedals. A lock mechanism is interposed between at least one of the clutch shaft 30 and the distribution shaft 23, and a brake arm of the lock mechanism is provided in the middle of the connection member. The above-mentioned problem has been solved without complicating the operation mechanism by interlocking and linking the sections.

[0005]

When the traveling direction is corrected during the operation, if one of the brake pedals is lightly depressed, the side clutch associated therewith is disengaged and the traveling direction is corrected. Also, when one of the brake pedals is fully depressed, the side brake is activated, and the aircraft can be rotated with a small turning radius. During such a steering operation, the connecting member connecting the left and right clutch arms moves back and forth by about の of the front and rear movement amount of the activated clutch arm. Further, when stopping the fuselage, when the clutch pedal and both brake pedals are depressed, the left and right side clutches are disengaged, the side brakes are activated, and the left and right rear wheels are stopped. The rotation of the arm causes the arm to rotate forward by substantially the same amount, thereby causing the brake arm to activate the lock mechanism and the clutch shaft and the distribution shaft to be integrated, so that the front wheel, which is interlocked with the rear wheel, Can be 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.
It is connected so that it can go 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 interposed between the front wheel drive shafts 16 and 16 and a bevel gear at a front end of a rear wheel transmission shaft 20, and a rear end of the rear wheel transmission shaft 20 is a rear axle case 21. To the rear wheel input shaft 22 protruding forward from the shaft.

[0008] The bevel gear 24 b mounted in the middle of the distribution shaft 23 of the rear axle case 21 meshes with a bevel gear 24 a mounted to the rear end of the rear wheel input shaft 22, both ends of the distribution shaft 23 Of the claw clutches 25 and 25a engaged so as to rotate integrally with each other, only the right claw clutch 25 slides in the axial direction, and is urged by the compression spring 26 toward the rear wheel input shaft 22. The claws are thicker in the radial direction and longer in the axial direction. Passive pawl clutches 27, 27a always meshing with the pawl clutches 25, 25a are mounted on the outside of the pawl clutches 25, 25a. Friction plates 28,... For example, as shown in FIG. 5, the clutch is spline-fitted so as to rotate integrally with the clutch shaft 30 on which the passive pawl clutches 27 and 27a are fitted, as shown in FIG.
Clutch case 31 boss portion 31a that has splined as shown has a cutout groove of the two rows, these notches 32, the friction plate 33, fitted with the protrusion 23a of the outer circumference slidably Are interposed between the friction plates 28 with the inner end being received by the ring 34, and the two plates are interposed via the spacer 36 which comes into contact with the body 30a of the clutch shaft 30. It is urged by a disc spring 35.

A groove 37 formed on the outer periphery of a boss 31a extending outward from the clutch case 31 has a friction plate 3 which is a component of a side brake B composed of a friction brake.
The projections 38a projecting from the inner periphery of 8... Are loosely fitted, and the projections 38 projecting from the outer periphery of the friction plates 40. 40a
Are loosely fitted and interposed between the friction plates 38... Two disc springs 41 received by a ring-shaped plate 42 are interposed in an extended state on the outside, and as a result, The side clutch A and the side brake B could be integrated. A bearing 44 is mounted on a pin at the tip of a shift arm 43a fixed to the lower end of a side clutch shifter shaft 43 rotatably supported on the upper outside of the rear axle case 21. A clutch arm 45 is mounted on the upper end of the clutch shaft 30. A gear 46 mounted on the outer end of the clutch shaft 30 drives a rear axle 47 via a plurality of reduction gears.

A lock clutch 50 which constitutes a lock mechanism comprising a pawl clutch spline-fitted to the inner end of the clutch shaft 30 is provided in a bore 48 on the inner end side of the right passive pawl clutch 27. The claw clutch 2
5 is urged in the release direction by the compression spring 26, so that only the pawl of the passive pawl clutch 27 meshes with the pawl of the pawl clutch 25 and does not mesh with the pawl of the lock clutch 50 at all times. A lock shift shaft 51 is supported on the rear axle case 21 near the lock clutch 50, and a lower end of the lock shift shaft 51 has a shift arm that engages with a step on the outer periphery of the pawl clutch 25. 5
2 and a brake arm 53 is mounted on the upper end.

Next, the operation device will be described. A clutch pedal 55 disposed on the front left side of the driving section is integrally mounted on a shaft 56, and an arm 57 projecting from the shaft 56 is One of a pair of left and right brake pedals 59, 60, which are interlockingly connected to the main clutch 12 and are disposed on the right side of the driving unit, are mounted so as to rotate integrally with the shaft 61, and the other is rotatably mounted. 59 and 60 are interlockingly connected to the left and right clutch arms 45 and 45 by rods 64 and 64, and these clutch arms 45 and 45 are interlockingly connected by a rod-shaped connecting member 65. It is linked to the brake arm 53 by a connecting rod 66.

When one of the brake pedals 59 and 60 is depressed shallowly while working with the above-described riding work machine, first, the shift arm 43 interlocked therewith.
Since a rotates and pushes the clutch case 31 against the disc spring 35 via the plate 42, the side clutch A on that side is disengaged and the transmission to the rear wheel 3 is interrupted, so that the traveling direction is corrected. When the pedal is fully depressed, the side brake B is operated after the side clutch A is disengaged and the rear wheel 3 is stopped, so that the vehicle can be rotated with a small turning radius. At this time, since only one end of the rod 65 is moved forward by the clutch arm 45 on the side thereof and the other end is not moved, the moving amount of the connecting rod 66 is の of that of the clutch arm 45. In this state, the pawl clutch 25 does not engage with the lock clutch 50.

When the vehicle is traveling on the road, the clutch pedal 55 is depressed to stop the aircraft, and then the left and right brake pedals 59 and 60 are fully depressed.
The main clutch 12 is disengaged, and the transmission of the traveling system and the working machine transmission system is cut off.
45 rotates and the side brakes B, B are operated after the side clutches A, A are disengaged, and the clutch arms 45,
With the rotation of 45, the rod 65 moves the clutch arm 4
5 and 45, the brake arm 53 pivots greatly via the connecting rod 66, so that the pawl clutch 25 moves against the compression spring 26 and meshes with the lock clutch 50. As a result, the distribution shaft 23, the left and right clutch shafts 30, 30 and the rear wheel transmission shaft 20 are integrated, so that the final transmission shaft 15 in the transmission case 4 does not rotate, and the front wheel drive shaft 1 linked to and linked to the transmission shaft 15 is connected.
The brakes are applied to the wheels 6 and 16, the road surface is slippery like concrete, and even if a large load is applied to the front wheels on a downhill, the vehicle can be stopped without slipping. it can.

Further, the distribution shaft 23 and the clutch shaft 3
0, 30 are on a straight line, and the side clutch A, side brake B, and lock clutch 50 interposed therebetween are also arranged on the same axis as their shafts 23, 30, 30, so that the configuration is extremely simple. The rear axle case 21 can be reduced in size and weight, and furthermore, the assembly is easy.

FIG. 11 shows another embodiment, in which a spring 66a is used instead of the connecting rod 66 in the above embodiment. With such a configuration, even when the tops of the opposing clutch claws are overlapped, the same pedal stroke as that at the time of normal engagement can be maintained, so that the operation feeling is good.

[0016]

According to the present invention, the front working wheels 2 and the rear wheels 3 are interlocked and connected by a rear wheel input shaft 22 in a riding work machine in which a side clutch A and a side brake B are respectively mounted on left and right rear wheel driving units. The clutch shafts 30, 30 are interlockingly connected to both sides of the distribution shaft 23 via a side clutch A and a side brake B, respectively, and left and right clutch arms for operating the left and right side clutches A and B are interconnected. It is connected by a member 65 and is also connected to separate brake pedals 59 and 60, respectively, and a lock mechanism is interposed between at least one of the clutch shaft 30 and the distribution shaft 23, and a brake arm of the lock mechanism is connected to the connection member. 65, which is linked to the middle part of the vehicle, so that the operating device of the lock mechanism can be simplified and the cost can be reduced. By depressing the brake pedals 59 and 60, the left and right rear wheels are braked, and the moving amount of the connecting member 65 is increased to operate the lock mechanism, whereby the distribution shaft 23 and the clutch shaft 30 are integrated, and The front wheel 2 interlocked with the rear wheel 3 is also braked and safe. Moreover, the side brakes 59, 6
The operation timing of 0 and the lock mechanism does not get out of order.

[Brief description of the drawings]

FIG. 1 is a plan view of a steering operation device of a riding rice transplanter.

FIG. 2 is a developed sectional view of a rear wheel drive unit.

FIG. 3 is a cross-sectional view of a main part.

FIG. 4 is a plan view in which a part of a side clutch and a side brake operation unit of a rear wheel is cut away.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view taken along line BB of FIG. 3;

FIG. 7 is a side view of the riding rice transplanter.

FIG. 8 is a transmission system diagram.

FIG. 9 is a plan view showing the operation of the connecting member and the brake arm when both brake pedals are depressed.

FIG. 10 is a plan view of the same when one of the brake pedals is depressed.

FIG. 11 is a plan view of another example of the lock mechanism operating device.

[Explanation of symbols]

 2 Front wheel 3 Rear wheel 12 Main clutch 15 Final transmission shaft 16 Front wheel drive shaft 20 Rear wheel transmission shaft 25, 25a Claw clutch 27.27a Passive claw clutch 30 Clutch shaft 33, 38, 40 Friction plate 41 Disc spring 50 Lock clutch 65 Connection Member 66 Connecting rod A Side clutch B Side brake

Claims (1)

(57) [Scope of request for utility model registration] In a riding work machine in which a side clutch A and a side brake B are respectively mounted on left and right rear wheel driving units, a front wheel and a rear wheel are interlocked and a distribution shaft 23 driven by a rear wheel input shaft 22 is provided. The clutch shaft 30 on each side,
The left and right clutch arms for actuating the left and right side clutches A and B are connected to each other by a connecting member 65 and linked to separate brake pedals. A passenger vehicle having a lock mechanism interposed between at least one of the clutch shaft 30 and the distribution shaft 23, and a brake arm of the lock mechanism interlockingly connected to an intermediate portion of the connection member 65. Brake equipment.