JP2969777B2 - Steering and turning devices such as combines - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering turning device used as a steering transmission device for a combine or a tractor.

[Prior art and problems to be solved by the invention]

In a traveling vehicle body having a pair of left and right steering clutches,
In order to improve the turning performance, there is a mode in which when the steering clutch is disengaged, a steering brake for braking the rotation of the steering clutch gear is provided after the steering clutch is disengaged. When the steering brake is made of a wet friction plate, the oil to be circulated is heated by friction between the friction plates of the steering brake even when the steering brake is not effective, and the oil viscosity is easily reduced. . The present invention seeks to eliminate such defects.

[Means for solving the problem]

According to the present invention, a brake housing 4 of a steering brake 3 in the form of a wet friction plate for disengaging and braking the steering clutch 2 on the steering clutch shaft 1 is provided with a steering clutch gear when the steering clutch 2 is engaged. 5, a steering and swivel device such as a combine provided to rotate in the same direction.

[Action and effect of the invention]

When the steering clutch 2 is engaged, the power is transmitted to the traveling shaft 10 via the steering clutch 2 and the steering clutch gear 5. By moving the steering clutch gear 5 outward in the axial direction, the steering clutch 2 is disengaged to stop the transmission of the steering clutch gear 5, and the transmission to the traveling shaft 10 is also stopped.

However, since the steering clutch gear 5 is interlocked with the traveling shaft 10 even after the transmission is turned off, the steering clutch gear 5 may be rotated by the rotation of the traveling shaft due to inertia or the like. At this time, the steering clutch gear 5 is further moved outward in the axial direction from the disengaged position of the steering clutch 2, whereby the steering brake 3 is pressed to be braked.

By returning the steering clutch gear 5 inward in the axial direction, the steering brake 3 is released, and the steering clutch 2 returns to the engaged state. At this time, the brake housing 4 of the steering brake 3 is rotated in the same direction as the steering clutch gear 5.

Thus, while the steering clutch 2 is engaged and the steering brake 3 is not braked, the brake housing 4 of the steering brake 3 is rotated in the same direction as the steering clutch gear 5. In addition, the frictional action of the oil between the friction plates in the steering brake 3 is reduced, so that the heating of the oil and the decrease in the viscosity due to the oil can be prevented, and the steering braking effect can be maintained satisfactorily.

〔Example〕

In the traveling transmission case 8, a transmission shaft 11, a steering clutch shaft 1, an intermediate shaft 12, and the like are arranged between an upper input shaft 9 and a lower pair of left and right traveling shafts 10, and one end of the input shaft 9. ,
Hydraulic continuously variable transmission mounted outside this traveling transmission case 8
By connecting the output shaft 13 of the HST and operating the shift shaft 14, the main shift can be performed by continuously changing the speed from the neutral position N to the forward shift position F or the reverse shift position R. Reference numeral 15 denotes an input shaft driven from the engine. Also, the input shaft 9
A power take-off pulley 16 is provided at the other end of the pulley. In addition, a sprocket 17 is provided at an outer end of each of the left and right traveling shafts 10 to transmit a traveling device in the form of a crawler.

The transmission gears L, M, and H on the input shaft 9 and the respective gears 18 on the transmission shaft 11 that can mesh with them constitute a subtransmission, and the gear 19 of the transmission shaft 11 is mounted on the steering clutch shaft 1. Is always meshed with the center gear 7 at the center of. The center gear 7 and the steering clutch shaft 1 are configured to rotate integrally with each other, and the clutch pawls 20 on both left and right sides of the center gear 7 are rotatably fitted to the steering clutch shaft 1 so as to be freely rotatable in the axial direction. A pair of left and right steering clutches 2 is constituted by the clutch claws 21 at the inner end of the clutch gear 5.

The steering clutch gear 5 can be moved in the axial direction by a shifter 22, and always meshes with the intermediate gear 23 of the intermediate shaft 12 regardless of the movement of the steering clutch gear 5. Meshed with the gear 24, and each steering clutch gear 5
Are linked to the opposing traveling shaft 10.

The steering brake 3 is formed between a brake housing 4 rotatably provided on the steering clutch shaft 1 and an outer end of the steering clutch gear 5. Pressure desk 25 fitted over the tip
A friction plate fitted to the brake housing 4 side is interposed between the steering clutch gear 5 and the friction plate.
By moving outwardly at 22 and pressing the pressure desk 25 outward, each friction plate can be moved in the axial direction and pressed against the brake housing 4 so that the steering clutch gear 5 can be braked. . When driving with power transmission,
A part of the oil in the traveling transmission case 8 is circulated in the steering brake 3 in the brake housing 4.

A clutch 6 that rotates integrally in the same direction as the shaft 1 is provided at the distal end of the steering clutch shaft 1 so as to be freely movable in the axial direction of the steering clutch shaft 1 by operating a shifter 26, and is rotatable at the distal end. The gear 27 provided on the steering wheel 3 or the brake housing 4 of the steering brake 3 can be engaged. Further, a gear 28 is provided in the brake housing 4, and the gear 28 and the gear 28 are provided.
The reverse gears 29 and 30 are always meshed with each other.

In FIG. 1, when the clutch 6 is moved to the left and the clutch 6 and the brake housing 4 are engaged, the rotational power of the steering clutch shaft 1 is transmitted to the clutch 6, and the clutch 6 is further transmitted to the brake housing 4. Thus, the brake housing 4 is rotated in the same direction as the rotation direction of the clutch shaft 1.

Conversely, the clutch 6 is moved to the right to
When the gear 27 meshes with the gear 27, the rotational power of the steering clutch shaft 1 is transmitted to the clutch 6, and then transmitted from the clutch 6 to the gear 27 to rotate the gear 27 in the same direction as the rotational direction of the clutch shaft 1. . Further, the rotational power of the gear 27 is
The idle gear 30 is transmitted to the idle gear 29 which meshes with the idle gear 30. The idle gear 30 is transmitted from the idle gear 29 to the idle gear 30 which meshes with the idle gear 30.
The transmission is transmitted to the gear 28 of the brake housing 4 meshing therewith, and the brake housing 4 rotates in the direction opposite to the rotation direction of the steering clutch shaft 1.

These clutch 6, gear 27 and reversing gears 29, 30
It is provided in a reverse rotation transmission case 31 mounted outside the traveling transmission case 8.

The arm 32 of the steering clutch shifter 22 for operating the left and right steering clutch gears 5 and the arm 33 of the shifter 26 for operating the clutch 6 are interlocked by left and right operation levers 34, and the operation levers 34 By turning in the direction, the steering clutch 2 on the operated side is disengaged, the steering brake 3 is braked, and the clutch 6 is switched to the gear 27 side so that the rotational power of the gear 27 is changed. Is transmitted to the idler gear 29 meshing with the gear 27. The idle gear 29 is transmitted to the idle gear 30 meshing with the idle gear 29. The idle gear 30 is transmitted to the gear 28 of the brake housing 4 meshing with the idle gear 30, and the brake housing 4 is rotated in the rotational direction of the steering clutch shaft 1. And rotate in the opposite direction.

Therefore, the transmission to the steering shaft 10 on the side where the operation lever 34 is operated is turned off, and the turning of the traveling shaft 10 can be braked by the braking of the steering brake 3. By turning the traveling shaft 10 on the side in the reverse direction, a sharp steering turn can be performed.

3 to 6, the point different from the above example is that instead of the pair of left and right operation levers 34, a pair of left and right operation petals 35 is used to control the reverse rotation control valve 37 of the reverse rotation circuit 36 to each of the left and right limit switches. The shifter 26 is operated by switching control via 38, a solenoid 39 and the like, and the shifter 26 is operated by left and right switching cylinders 40 switched by a reverse rotation control valve 37.

The operation petal 35 is linked to the arm 32 of the shifter 22 of the steering clutch 2 on the opposite side. By stepping on one of the left and right operating petals 35, the opposing left (L) or right (R) steering clutch 2 is disengaged and the steering brake 3
And by turning on the limit switch 38,
The reversing control valve 37 is switched to the left and right, so that the clutch 6 that brakes the steering brake 3 is engaged with the gear 27 side.

Then, the rotational power of the gear 27 is transmitted to the idle gear 29 that meshes with the gear 27. The idle gear 29 is transmitted to the idle gear 30 meshing with the idle gear 29. The idle gear 30 is transmitted to the gear 28 of the brake housing 4 meshing with the idle gear 30, and the brake housing 4 is rotated in the rotational direction of the steering clutch shaft 1. And rotate in the opposite direction. P is a hydraulic pump, and 41 is an unload valve.

In each of the above examples, the brake housing 4 is rotated in the reverse direction, and the turning-side traveling shaft 10 is driven to rotate in the reverse direction, thereby making a sharp turn. Alternatively, it may be configured to simply fix and not rotate in the reverse direction.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a front sectional view, FIG. 2 is a partial operating mechanism diagram, FIG. 3 is a side view showing another embodiment, and FIG. FIG. 5 is a partial side view, and FIG. 6 is an electric circuit diagram. (Explanation of reference numerals) 1 ... steering clutch shaft, 2 ... steering clutch, 3 ... steering brake, 4 ... brake housing, 5 ... steering clutch gear, 6 ...
... clutch, 7 ... center gear, 8 ... travel transmission case, 9 ... input shaft, 1
0… travel shaft, 11… speed-change shaft, 12 …… intermediate shaft, 13 …… output shaft, 14 …… speed-change shaft, 15 …… input shaft 15,16 …… power take-off pulley, 17 …… sprocket, 18 … Gear, 19… Gear, 20 …… Clutch claw, 21 …… Clutch claw, 22 …… Shifter, 23 …… Intermediate gear, 24 …… Gear, 25 …… Pressure desk, 26 …… Shifter, 27… … Gear, 28… gear, 29… reverse gear, 30… reverse gear, 31… reverse transmission case, 32… arm, 33… arm, 34… operating lever, 35… operating petal, 36 … Reversing circuit, 37… Reverse control valve, 38… Limit switch, 39… Solenoid, 40… Switching cylinder, 41… Unload valve.

Claims (1)

(57) [Claims] 1. A brake housing 4 of a steering brake 3 in the form of a wet friction plate for disengaging and braking a steering clutch 2 on a steering clutch shaft 1, and a steering clutch gear when the steering clutch 2 is engaged. 5. A steering and turning device, such as a combine, provided to rotate in the same direction as 5.