JPH0692158A - Main clutch following turn preventing brake for tractor - Google Patents

Abstract

(57) [Summary] [Purpose] Control of the anti-rotation brake 2 according to the traveling power transmission state in order to prevent the traveling power transmission system on the driven side from rotating when the main clutch 1 in the traveling power transmission of the tractor is disengaged. To perform. A braking force of an anti-rotation brake 2 for braking a driven side of a wet main clutch 1 is controlled by an oil temperature of lubricating oil of the main clutch 1, a shift position of a transmission 3, a vehicle speed, or the like. The structure of the anti-rotation brake with the main clutch of the tractor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-rotation brake with a main clutch for braking in order to prevent rotation of the tractor with the main clutch.

[0002]

2. Description of the Related Art In a traveling transmission device for a tractor having a wet type multi-plate type main clutch, if the main clutch is not properly disengaged, transmission gears and the like are accompanied, It may be difficult to shift smoothly. According to the present invention, when such a wet type main clutch is disengaged, a turn prevention brake is provided to prevent turning by braking the driven side. Moreover, since this rotation depends on the viscosity of the lubricating oil of the wet main clutch, the speed reduction ratio of the traveling power transmission rotation, etc., the effectiveness of the rotation prevention brake for preventing this rotation is controlled. Therefore, the turning of the driven side when the main clutch is disengaged is accurately prevented.

[0003]

According to the present invention, the braking force of an anti-rotation brake 2 for braking the driven side of a wet main clutch 1, the oil temperature of lubricating oil of the main clutch 1 and the speed change device 3 are used. A rotation preventing brake with a main clutch of a tractor characterized by being controlled by a shift position, a vehicle speed, or the like.

[0004]

By the driving of the engine, it is transmitted to the traveling wheels via the main clutch 1, the transmission 3, and the like. When the main clutch 1 is turned off, the frictional force in the wet multi-disc type is reduced and the power transmission is turned off. When the main clutch 1 is disengaged, the turn prevention brake 2 is braked on the driven side, and the turn of the main clutch 1 to the traveling wheels of the transmission 3 and the like is braked and prevented.

When the braking force of the rotation prevention brake 2 is controlled by the oil temperature of the lubricating oil of the wet main clutch 1, when the oil temperature is low, the braking force becomes strong and when the oil temperature is high. Controls to reduce the braking force. Further, when controlling by the shift position of the transmission 3 or the traveling speed of the wheels or the vehicle body, that is, the vehicle speed, the braking force is controlled to be strong at low speed and weak at high speed.

As described above, the turning prevention brake 2 of the main clutch 1 controls the braking force of the turning prevention brake 2 for braking the driven side of the main clutch 1 according to the turning force of the wet multi-plate. Therefore, the main clutch 1 can be accurately disengaged irrespective of changes in the transmission through the main clutch 1, running conditions, and the like, and the gear shift operation of the transmission 3 can be smoothly performed.

[0007]

[Example] The tractor body 4 is provided with a front engine E,
The clutch housing 5, the transmission case 6, the rear transmission case 7 and the like are integrally connected to each other over the rear portion, and a front wheel bracket 8 is provided on the front side of the clutch housing 5, and the front axle bracket 8 is provided. On the lower side, a front axle housing 1 which can be freely rolled by a center pivot 9
0 is supported, and front wheels 12 are rotatably mounted on both ends of the front axle housing 10 by steering 11.
I have three. Further, rear axle housings 14 are provided on both the left and right sides of the rear transmission case 7, and rear wheels 15 are provided at the left and right ends thereof.
Is mounted on the shaft 16 so that four-wheel drive can be performed by driving the engine E. Reference numeral 17 is a lift arm, and 18 is a driver's seat.

In the clutch housing 5, a flywheel shaft 21 is driven from a crankshaft 19 of an engine E via a flywheel 20, and a wet multi-disc type main clutch is located on the axis of the flywheel shaft 21. 1, the main clutch shaft 22, the reverser input shaft 25 that is constantly transmitted from the rear end of the main clutch shaft 22 by meshing with the gears 23, 24, and the direct meshing with the gears 24, 26 of the reverser input shaft 25. A reverser shaft 30 having a reverse gear 29 indirectly meshed via a forward gear 27 and a back counter gear 28,
A shaft 31 of the back counter gear 28, a PTO input shaft 34 having a gear 33 that meshes with the gear 32 on the flywheel shaft 21, and a gear 3 at the rear end of the PTO input shaft 34.
5, a PTO clutch shaft 38 having a gear 36 that meshes with the gear 5, a PTO clutch 37 in the form of a wet multi-plate, and the front axle 1
The front portion of the front wheel transmission shaft 39 that is transmitted to the shaft 3 and the like are respectively mounted.

In addition, the transmission case 6 is forwardly or reversely transmitted from the reverser shaft 30 to be transmitted to each transmission input gear 4.
0 to 43, a main transmission shaft 49 having transmission gears 45 to 48 that are constantly meshed with the transmission input gears 40 to 43, a transmission gear 50 located on the axis of the main transmission shaft 49, A rear wheel output shaft 53 having a front wheel take-out gear 51 and a rear wheel output gear 52 at the rear end, the main transmission shaft 49
It has a transmission gear 55 that constantly meshes with the gear 54 at the rear end, a transmission gear 56 that constantly meshes with the transmission gear 50, and gears 57, 58 that rotate integrally with the front-wheel take-out gear 51.
And a rear portion of the front axle transmission shaft 39 having a front wheel clutch gear 60 capable of meshing with the gear 58 of the auxiliary transmission shaft 59, a PTO transmission shaft 61 rotatably inserted in the auxiliary transmission shaft 59, and A reduction shaft 65 having a gear 62 meshing with the gear 54 and a gear 64 integrally meshing with the transmission gear 50 and meshing with the gear 63 are mounted.

Further, the rear transmission case 7 has a differential device that is transmitted from the rear wheel output gear 52 and is transmitted to the rear wheels 15, and is also a PTO that transmits the speed change from the PTO transmission shaft 61 to the rear end PTO shaft. It has a transmission and the like. The main clutch 11 moves the shifter 67 along the main clutch shaft 22 by the operation of the shifter arm 66, and presses it into the main clutch 1 via the spring 68.
By pushing the operation panel 70 in 9, the main clutch 1 can be operated from always ON to OFF.

An oil passage 71 formed in the main clutch shaft 22 is passed between the wet multi-plates of the main clutch 1,
Lubricating oil is supplied through the hydraulic pump P, the shunt valve 72, the brake control solenoid valve 73, and the like. 7
Reference numeral 9 is an inlet of the oil passage 71, and 74 is an outlet. When the main clutch 1 is disengaged, the pressure disc 69 on the driven side and the clutch shaft 22 which rotates integrally with the driven disc 69 tend to be rotated by the frictional force between the wet type discs. By forming a brake drum 75 on the clutch housing 5 and pressing the brake shoe 76 provided on the clutch housing 5 against the spring 77 by the hydraulic piston 78, the rotation of the pressure disk 69 can be braked. The preventive brake 2 is configured. This hydraulic piston 78 is the solenoid valve 7 of the hydraulic circuit.
3 is switched and supplied. The solenoid valve 73 is
This hydraulic piston 78 and the main clutch 1 passing through the oil passage 22
Change to lubrication and lubricate.

An oil temperature sensor S1 for detecting the oil temperature of the lubricating oil to the main clutch 1 can be input to a controller CPU having a microcomputer, and the solenoid valve 73 can be output. Further, instead of the oil temperature sensor S1, or together with the oil temperature sensor S1, a shift position sensor S2 for detecting the shift position of the transmission 3, and an axle 16 of the rear wheel 15.
The vehicle speed sensor S3, which detects the number of revolutions and detects the vehicle speed, is input and controlled.

The control relationship in the controller CPU is
As shown in FIG. 2, depending on the vehicle speed or the gear shift position, the piston 7 is designed to exert a greater braking force as the reduction ratio becomes larger.
The output is controlled so that the hydraulic pressure of 8 is increased. A pressure control valve such as a proportional pressure reducing valve may be used to control the pressure of the piston 78. Further, when the oil temperature of the lubricating oil of the main clutch 1 is used, the braking force is controlled to be strong when the oil temperature is low and weak when the oil temperature is low, depending on the value detected by the oil temperature sensor S1.

When the anti-rotation brake 2 is braked by switching by the solenoid valve 73, the supply of the lubricating oil between the wet multi-plates to the brake 2 is stopped, so that the turning torque can be reduced and the main clutch can be reduced. The cut of 1 improves. The reverser shaft 30 is provided with a synchro-type reverser clutch 80 to rotate the forward gear 27 or the reverse gear 29 from the neutral position.
Switch to and transmit.

The main transmission shifts gears in the low speed range by switching to the shift gears 45 and 46 by the shift clutch 81 on the main transmission 49, and the shift clutch 8 of the synchronizing type is used.
It is possible to shift in the high speed range by switching to the shift gears 47 and 48 according to 2. The subtransmission device switches the transmission clutch 83 on the rear wheel output shaft 53 to the gear 54 at the rear end of the main transmission shaft 49 and the transmission gear 50 on the rear wheel output shaft 53, and also on the subtransmission shaft 59. By changing over the speed change clutch 84 between the front and rear speed change gears 55 and 56, the sub speed change can be performed.

6 to 8 differ from the above example in that
The brake plate 85 pushed by the clutch shifter 67 is brought into pressure contact with the pressure plate 69 of the main clutch 1 so that the main clutch 1 is disengaged, and then the braking is performed by the brake disc 85. The brake disc 70 has a pin hole 8 which is an elongated hole along the rotation direction.
6 is arranged at an equiangular position, and the brake disc 85 is attached through the pin 87 fitted in the pin hole 86,
It can be pressed against the pressure plate 69.

In the main clutch 1, a disc case 88 accommodating the clutch discs 89 and 90 is fixed to the flywheel shaft 21 as a drive side, and the clutch discs 89 are integrally rotated. Further, the driven side clutch core 93 has a clutch disc 90 on the outer circumference, and front and rear pressure plates 91 and 69. The clutch core 93 and the front and rear pressure plates 91 and 69 are provided.
And a clutch pin 92 that is inserted in parallel with the clutch shaft 22 across the operation panel 70, and a spring 68 that tensions the clutch connection side is fitted around each of the clutch pins 92, and the clutch pin 92 is inserted. A tension is applied between the core 93 and the operation panel 70.

The flywheel shaft 21 by the engine E
Is indicated by arrow A, the disk case 88 on the drive side of the main clutch 1 that rotates integrally with the flywheel shaft 21.
Also rotates in the same direction A. When the main clutch 1 is engaged, the clutch pin 87 has a pin hole 86 as shown in FIG.
Is located on the rear end side with respect to the rotation direction A, but when the main clutch 1 is disengaged by stepping on the clutch petal, the anti-rotation brake 2 brakes, and each pin 87 extends along the pin hole 86. The rotation angle B of 86 can be moved.

In the gap B between the pin hole 8 of the operation panel 70 and the pin 87 fitted therein, in the entrainment prevention brake 2, the reverser clutch 80 and the speed change clutches 81, 82, 83 are provided. , 84, etc. can be absorbed in the shift operation due to the meshing of the shift clutches, and a smooth shift operation can be performed.

[Brief description of drawings]

FIG. 1 is a hydraulic control block diagram.

FIG. 2 is a control graph of an anti-rotation brake.

FIG. 3 is a side view of a clutch housing portion.

FIG. 4 is a side view of a mission case portion.

FIG. 5 is a side view of the tractor.

FIG. 6 is a side view of a main clutch portion showing another embodiment.

FIG. 7 is a rear view thereof.

FIG. 8 is a side view of the clutch housing part.

[Explanation of symbols]

 1 Main clutch 2 Anti-rotation brake 3 Transmission

Claims (1)

[Claims] 1. The braking force of an anti-rotation brake 2 for braking the driven side of a wet main clutch 1 is controlled by the oil temperature of lubricating oil of the main clutch 1, the shift position of a transmission 3, or the vehicle speed. Anti-rotation brake with main clutch for tractors.