JPH01203748A - Power transmission in mobile working vehicle - Google Patents

Abstract

PURPOSE:To let reverse driving force escape by installing each driving belt with a clutch between a transmission case and a prime mover as well as between this case and a farm working machine respectively, and making them so as to be disengaged if the clutch on one side is made off, the clutch on the other also comes off simultaneously. CONSTITUTION:A driving belt 5 is rolled on an input pulley 16 of a transmission case 2 and an output pulley 11 of a prime mover, and a tension roller 20 presses the driving belt 5 with a travel clutch 4 engaged whereby rotation is transmitted. Likewise, a driving belt 8 is rolled on the input pulley 16 and also a working machine input pulley 18, and a tension pulley 27 is pressed with a working machine clutch 7 inputted whereby rotation is transmitted as well. A turning shaft of a support arm 28 of the pulley 27 is installed as covering the circumference of a turning shaft 22 of a support arm 21 of the pulley 20, and when this support arm 21 is rotated in the off direction, the turning shaft of the support arm 28 is interlocked in the off direction with the projection and thus rotated. Consequently, even if reverse driving force occurs in the wheels on a sloping road, it is made to set free.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power transmission device for a mobile work vehicle.

[Prior art]

Conventionally, mobile work vehicles have been equipped with a prime mover to drive the vehicle, a transmission, a running latch, and a work equipment clutch, and the power drive shaft of the work equipment is also used as the input shaft of the transmission of the traveling section. is publicly known. In the above-mentioned known vehicle, when the running latch is released, power transmission to the transmission is cut off, so even if the work implement clutch is engaged, power is not transmitted to the work implement.

[Problem that the invention seeks to solve]

However, in the known method, when the machine is tilted forward and backward and the latch is released, a force to move the machine forward and backward is exerted by the weight of the machine. The driving force will be transmitted to the work machine via the work machine clutch.

However, since a considerable amount of force is required to drive the work equipment, braking force is applied to the input shaft of the transmission from the work equipment side, and the reverse driving force transmitted from the wheels is It will be concentrated between the axle and the input shaft of the transmission.

As a result, if there is a gear change mechanism between the axle and the input shaft of the transmission, a large amount of force is required to operate the gear, etc.
There was a problem that interfered with gear changes.

[Means for solving problems]

Therefore, the technical problem of the present invention is to provide a power transmission device for a mobile work vehicle that prevents the reverse driving force from the wheels from being transmitted to the work machine, thereby allowing smooth gear shifting operations. The technical means of the present invention to solve this technical problem includes a clutch device 4 between a transmission case 2 and a prime mover 3, which are internally equipped with a transmission gear interlockingly connected to a traveling device 1. A running belt 5 is provided, and a working belt 8 having a clutch device 7 is wound and provided between the mission case 2 and the working machine 6, and the clutch device i! of the running belt 5 is provided. This is a power transmission device for a mobile work vehicle, in which when the clutch device 7 of the work belt 8 is operated to disengage, the clutch device 7 of the work belt 8 is interlocked and disengaged.

[Effects of the Invention] The present invention provides a running belt 5 having a clutch device 4 between a transmission case 2 and a prime mover 3, which are internally equipped with a transmission gear interlockingly connected to a running device 1. A work belt 8 having a clutch device 7 is wound around and provided between the drive belt 5 and the work implement 6, and when the clutch device 4 of the traveling belt 5 is operated to disconnect, the clutch device 7 of the work belt 8 is interlocked to disconnect the clutch device 7. Since this is a power transmission device for a mobile work vehicle that has a configuration of Because of this, the reverse driving force is missed, and there is no need to concentrate on the gear change mechanism, which has the effect of allowing smooth gear change operations.

〔Example〕

An embodiment of the present invention in a combine harvester will be described with reference to the drawings. Reference numeral 9 indicates a frame of the combine, 10 indicates a driver's seat, and 3
is the engine attached to the frame 9, 11 is the output pulley, 2 is the transmission, 12 is the input shaft of the transmission 2,
13 is an axle provided below the mission 2;
A driving sprocket 15 for the crawler 14 is provided.

An input pulley 16 that pairs with the output pulley 11 and an output pulley 17 for one working section are attached to the input shaft 12, and a work machine input pulley 18 is provided near the output pulley 17. The work machine input pulley 18 is attached to an input shaft 19.

A tension belt 5 is wound between the output pulley 11 and the input pulley 16, and a tension roller 20 is in contact with the tension belt 5.

21 is a support arm of the tension roller 20;
is coupled to a rotating shaft 22 that is pivotally supported by the mission case 2, and the rotating shaft 22 is provided with a hydraulic cylinder 23. The hydraulic cylinder 23 is extended by turning on a switch 25 provided on the speed change lever 24, and is used to turn off the latch 4 for running. 26 is a spring that makes the tension roller 20 hit the tension belt 5.

The reaping section tension belt 8 is wound between the output pulley 17 and the working machine input pulley 18, and the tension roller 27 comes into contact with it. Reference numeral 28 denotes a support arm of the tension roller 27, and the boss portion 29 of the support arm 28 is the boss portion 3 of the support arm 21 of the tension roller 20 which is supported by the shaft 22.
It is loosely fitted around the outer periphery of 0. Further, a projection 31 is fixed to a boss 30 of the support arm 21 of the tension roller 20, and the projection 31 is connected to the tension roller 27.
It is located in the notch of the boss portion 29 of the support arm 28. When the support arm 21 of the tension roller 20 is rotated to the clutch disengaged state, the protrusion 31 comes into contact with the end surface of the notch of the boss 29, and the support arm 21 and the support arm 28 rotate together. The reaping latch 7 is also disconnected. In addition,
32 is a reaping latch lever, 33 is a tension spring, and 34 is a rod.

Next, the internal structure of mituramine 2 will be explained.

Inside the mission 2, from the top to the bottom, there is an input shaft 12.
, a speed change shaft 35, an output shaft 36, a clutch shaft 37, a pair of left and right axles 13, and the like are rotatably supported.

The speed change shaft 35 is rotatably provided with forward and reverse speed change gears 38 having different diameters, and a transmission gear 39 is provided between these gears to rotate together. Further, one end of this speed change shaft 35 forms a clip groove 40 on the side, and a speed change shifter 41
A key slider 42 is provided so as to be slidable in the axial direction, and a convex portion of a speed change key 43 is provided inside this key slider 42 so as to be freely rotatable around a pin. By fitting the clip force 1144 formed at the end into the clip groove 40, the variable speed wind 45 at the tip is
It can be swung outward, or it can be swung toward the axis by slidingly contacting the peaks between the clip grooves 40, and the clip at the speed change position engages and disengages the speed change air 45. This is a configuration that allows

A key groove 46 is formed on the outer peripheral surface of the shift shaft 35 over its entire length, into which the shift key 43 is fitted and slidably guided in the axial direction.

By forming an engagement groove 47 in which the shift wind 45 is engaged in the fitting surface of each shift gear 38 with respect to the shift shaft 35, and by engaging the shift wind 45 with the engagement groove 47 of the shift gear 38, The engaged transmission gear 38 is configured to rotate together with the transmission shaft 35. Further, the transmission gear 39 is provided with an annular ring groove 48, and when the speed change air 45 is located in the ring groove 48, the transmission gear 39 is in a neutral position where no speed change transmission is performed.

The input shaft 12 has an input gear 50 that directly meshes with each of the speed change gears 38 on the forward side and indirectly meshes with each of the speed change gears 38 on the reverse side through a rotatable gear 49 on the output shaft 36. are provided in a constant meshing transmission state, and the input shaft 12
An input pulley 16 and an output pulley 17 to the working device 6 are provided at the shaft end of the shaft.

The output shaft 36 has a transmission gear 39 and a gear 5 that is always in mesh with the transmission gear 39.
1 and a gear 52 are provided, and the center gear 53 on the clutch Il & 37 is meshed and transmitted.

Clutch gears 54 are provided on the left and right sides of the center gear 53 on the clutch shaft 37 so as to be slidable in the axial direction by shifters 55, and engage and disengage from the clutch pawls of the center gear 53 to transmit steering power. A pair of left and right steering clutches are configured to be turned on and off, and a steering brake 56 is braked by moving the clutch gear 54 outward from the steering clutch disengagement position.

The axle 13 is provided with a running gear 57 that is always in mesh with a clutch gear 54, and a sprocket 15 for transmission driving the crawler 14 is provided at the end of the shaft.

With the above configuration, when the engine 3 is started and the extension of the hydraulic cylinder 23 is released, the tension roller 20 is pressed against the tension belt 5 by the elasticity of the spring 26, so the tension belt 5 is tensed, and the input pulley is 16, the input shaft 12 is rotated, the axle 13 is rotated, and the vehicle moves forward and backward. When the operator in the cockpit 10 operates the reaping latch lever 32, the support arm 28 is rotated by the elasticity of the spring 33, so the reaping latch 7 is pressed against the reaping section tension belt 8, and the output pulley 17 is operated. Rotation can be transmitted to the machine-powered pulley 18 to drive the reaping section 6.

However, even when the aircraft is tilted forward or backward, the running latch 4 may be disconnected, but when the running latch 4 is disconnected, a force is applied to the aircraft to move it forward or backward due to its own weight, and this force is applied to the crawler. 14, sprocket 15, axle 13, running gear 57, clutch gear 54, center gear 53. It is transmitted to the speed change shaft 35 via the gear 52, the output shaft 36, the gear 51, and the transmission gear 39, and is further transmitted to the input gear 50, the input shaft 12. It is transmitted to the output pulley 17. In this state, if the reaping latch 7 is closed, a braking force will act on the output pulley 17 due to the load for driving the reaping section, and the reverse driving force will be generated by the speed change wind 45 and the speed change gear. The contact surface pressure between the engagement grooves 47 of 38 and the contact surface pressure between the shift key 43 and the keyway 46 are excessively increased, and a large force is required for shift operation, and the shift wind 4S
This may cause problems such as difficulty in entering the engagement groove 47 of the transmission gear 38. However, in the present invention, when the running latch 4 is cut, the boss portion 30 of the support arm 21 of the tension roller 20
The protrusion 31 fixed to the boss 29 comes into contact with the notch end face of the boss 29 and rotates the support arm 28 of the tension roller 27 integrally to the clutch disengaged state, so the above-mentioned problem does not occur. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a side view of its main parts, FIG. 3 is a plan view of its main parts, and FIG. FIG. 5 is a front view, and FIG. 6 is a partial front sectional view. 1... Traveling device 2... Mission case 3
... Prime mover 4... Latch for running 5...
Travel belt 6...Work machine 7...Work machine (reaping) clutch 8...Work belt

Claims (1)

[Claims] A clutch device 4 is disposed between the transmission case 2 and the prime mover 3, which include a transmission gear interlocked with the traveling device 1.
The transmission case 2 is provided with a running belt 5 having a
A work belt 8 having a clutch device 7 is wound around and provided between the drive belt 5 and the work machine 6, and when the clutch device 4 of the traveling belt 5 is operated to disengage, the clutch device 7 of the work belt 8 is disengaged.
A power transmission device for a mobile work vehicle, which is configured to cut in conjunction with each other.