JP2001187584A - Transmission mechanism of travel device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traveling vehicle improved in turning performance, making turns steplessly from a slow turn to a spin turn. SOLUTION: This transmission mechanism of a travel device for a working machine shifts power from an engine and transmits the shifted power to lateral axles through a clutch and a differential mechanism. In this constitution, the rotation of the differential mechanism is shift-controlled by a shift means to change the rotating ratio of the lateral axles to thereby permit turning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission mechanism for a traveling device of a working machine.

[0002]

2. Description of the Related Art Conventionally, a transmission mechanism of a traveling device of a working machine has a structure in which power from an engine is shifted to a predetermined gear ratio by gears to turn left and right axles.

[0003]

In the above-described configuration, the gears are shifted to a predetermined gear ratio, and the gears cannot be changed in a stepless manner.

[0004]

The above object of the present invention is achieved by the following constitution. That is, in a transmission mechanism of a traveling device in which the power from the engine is shifted and the shifted power is transmitted to the left and right axles via a clutch and a differential mechanism, the rotation of the differential mechanism is shifted by a speed changing means. This is a transmission mechanism of a traveling device of a working machine, characterized in that it is controlled to be able to turn by changing the rotation ratio of the left and right axles.

[0005]

According to the present invention, there is provided a transmission mechanism for a traveling device in which power from an engine is shifted and the shifted power is transmitted to left and right axles via a clutch and a differential mechanism. The rotation of the differential mechanism is controlled by the speed change means, and the transmission mechanism of the traveling device of the working machine is characterized in that it is configured to be able to turn by changing the rotation ratio of the left and right axles. When controlled, the axle inside the turning direction stops slowly and the axle inside the turning direction stops when the work machine is turned in either the left or right direction, with the axle inside the turning direction rotating at a lower speed in the same direction with respect to the axle outside the turning direction. The pivot turning and the spin turn in which the axle inside the turning direction is reversely rotated with respect to the axle outside the turning direction can be continuously and continuously executed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 to 6, an output shaft 60 for outputting an output from an engine to a hydraulic continuously variable transmission 3 is mounted in a transmission case 1, and the output shaft 60 has a driving gear. An external gear 62 constantly meshing with the drive gear 61 is rotatably mounted on the input shaft 2 via a mounting member 63. Internal teeth 64 are formed on the external gear 62. A central gear 65 is fixed to the input shaft 2, and a plurality of planetary gears 66 mesh between the central gear 65 and the internal teeth 64 of the external gear 62. Each planetary gear 66 is rotatably mounted on a shaft 96 provided on a rotating body 95 that rotates integrally with the intermediate gear 67 loosely fitted on the input shaft 2. 68 is an intermediate gear that meshes with the intermediate gear 67 loosely fitted to the intermediate shaft 8, 69
Is a gear loosely fitted to the side clutch shaft 13.

The swing clutches 26a, 26a 'of this embodiment
Are located on the left and right sides of a central partition member 72 in a rotating drum 71 fixed to the rotating shaft 25 '.
Are respectively formed, and the left and right turning cylinder chambers 73 and 7 are formed.
3 ′, pistons 74, 74 ′ are provided, and discs 75, 75 ′ are provided on the left and right inner surfaces of the rotating drum 71, and the discs 75, 75 ′ are rotatable with respect to the turning shaft 25 ′, Discs 77 and 7 that rotate together with 76 '
7 'is slidably contacted and separated. The gears 76, 76 'always mesh with the gears 22, 22', and the gears 76, 76 'are provided with integral or separate gears 78, 78'. A turning passive gear 79 is fixed to the turning shaft 25 ', and the turning passive gear 79 always meshes with the gear 69. Therefore,
The gears 22 and 22 'of the side clutch shaft 13 and the gear 7
6, 76 'and gears 78, 78' constitute a traveling transmission path, and the drive gear 61 of the output shaft 60, the external gear 6
2, the internal transmission gear 64, the central gear 65, the planetary gear 66, the intermediate gears 67, 68, 69, and the turning passive gear 79 mesh to form a turning transmission path.

The left and right clutches 14 and 14 ′ are provided in a rotary drum 15 fixed to the side clutch shaft 13. A partition member 16 that is orthogonal to the axial direction of the rotary drum 15 and rotates integrally is provided at a central portion in the rotary drum 15, and a left clutch cylinder chamber 17 is provided on the left side of the partition member 16. A right clutch cylinder chamber 17 'is formed on the right side of the left and right clutch cylinder chambers 17', respectively.
8 'is provided. The pistons 18, 18 ′ are tightly fitted to the side clutch shaft 13 and
Is slidable in the axial direction. Clutch discs 20 and 20 ′ that rotate with the rotary drum 15 are provided on the left and right inner surfaces of the rotary drum 15.
0 'is slidably contacted with the clutch disks 21 and 21' so as to be able to freely contact and separate. The clutch discs 21, 21 'are mounted on gears 22, 22' rotatable with respect to the side clutch shaft 13. Accordingly, when the left and right clutches 14 and 14 'are engaged, the side clutch shaft 13 rotates the gear 2
2. Rotate 22 '.

A brake shaft 80 which is fixed to the transmission case 1 and has a non-rotatable structure is provided in the vicinity of the turning shaft 25 ', and a central portion of the brake shaft 80 is similar to the left and right clutches 14, 14'. The formed left brake 81 and right brake 81 'are provided. 82 is a brake cylinder that cannot rotate with the brake shaft 80; 83 is a partition member provided in the brake cylinder 82; 84 and 84 'are left and right cylinder chambers;
5, 85 'is a piston, 86, 86' is a disc, 8
Reference numerals 7 and 87 'denote disks which rotate integrally with the gears 88 and 88' rotatable with respect to the brake shaft 80. Gear 8
8, 88 'always mesh with the gears 78, 78'.

Next, the operation will be described. The rotation of the input shaft 2 causes the intermediate shaft 8 to rotate via the switching gear group 6 (two-speed transmission with the large gear 4 and the small gear 4), and the passive gear 11 via the fixed gear 12 fixed to the intermediate shaft 8. To rotate the side clutch shaft 13. Small gear 5 of the switching gear group 6
Meshes with a large gear 10 fixed to the lower intermediate shaft 8,
The large gear 4 of the switching gear group 6 meshes with a small gear 9 fixed to the intermediate shaft 8 on the lower side, and the intermediate gear 8 is selected at a selected gear ratio.
Is driven. On the other hand, the rotation of the output shaft 60 is
1, transmitted to the intermediate gear 68 via the external gear 62, the mounting member 63, the planetary gear 66, and the intermediate gear 67,
The rotation of No. 8 is transmitted to the turning shaft 25 ′ via the gear 69 and the reverse rotation passive gear 79.

Since the side clutch shaft 13 is rotated by the rotation of the input shaft 2, when both the left and right clutches 14 and 14 'are engaged during normal traveling, the rotation is performed by the gears 22 and 22'. , The gears 76, 76 ', the gears 78, 78', and the gears 88, 88 'are transmitted to the counter shafts 52, 52' via a transmission transmission path, and the rotation of the counter shafts 52, 52 'is performed. It is transmitted to the left and right axles and travels forward and backward.

Next, one of the left and right clutches 14 and 14 'is disengaged, and the corresponding left and right brakes 81 and 81' are disengaged.
Is turned on, one of the disks 86, 86 'of the fixed brake cylinder 82 and one of the disks 87, 87' on the side of the gears 88, 88 'come into contact with the brake shaft 80, so that one rotation of the gears 88, 88' Brake, correct the direction, disengage both left and right clutches 14, 14 ',
When both the left and right brakes 81, 81 'are turned on, the gear 8
The brake is applied to the rotation of 8, 88 ', the rotation of the left and right axles is stopped, and the brake is applied.

Although the rotation of the output shaft 60 is constant, the rotation speed of the input shaft 2 is changed by the hydraulic continuously variable transmission 3, so that the external gear 62 meshing with the drive gear 61
The relative number of rotations of the external gear 62 and the central gear 65 changes, and the planetary gear 6 located between the internal gear 64 of the external gear 62 and the central gear 65.
6 changes from normal rotation to reverse rotation by this change. Therefore,
Planetary gear 66 by changing the rotation speed of input shaft 2
, The turning shaft 25 'is reversed. In this state, one of the left and right clutches 14, 14 'is disengaged, and the corresponding turning clutches 26a, 26a of the turning shaft 25' are turned off.
When one of a ′ is turned on, the gear 53 and the gear 53 ′ rotate in opposite directions to each other, and perform a spin turn by rotating the left axle and the right axle in opposite directions.

In this case, since the rotation is smoothly changed from forward rotation to reverse rotation by the characteristics of the planetary gear 66, one of the left and right clutches 14 and 14 'is disengaged, and the corresponding turning clutch of the turning shaft 25' is turned off. When the rotation speed of the input shaft 2 is changed by the hydraulic continuously variable transmission 3 in a state where one of 26a and 26a 'is turned on, the left axle and the right axle are rotated in opposite directions while gradually increasing the speed. To make a spin turn.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a deployed state of an embodiment.

FIG. 2 is a sectional view of the main part.

FIG. 3 is a sectional view of the main part.

FIG. 4 is a side view of the planetary gear.

FIG. 5 is an explanatory diagram of the embodiment.

FIG. 6 is an explanatory diagram of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transmission case, 2 ... Input shaft, 3 ... Hydraulic continuously variable transmission, 4 ... Large gear, 5 ... Small gear, 6 ... Switching gear group, 8
... Intermediate shaft, 9 ... Small gear, 10 ... Gear gear, 11 ... Passive gear, 12 ... Drive gear, 13 ... Side clutch shaft, 14 ...
Left clutch, 14 '... right clutch, 15 ... rotating drum,
16: Partition member, 17: Left clutch cylinder chamber, 1
7 ': cylinder chamber for right clutch, 18, 18': piston, 20, 20 ', 21, 21': clutch disk,
22, 22 '... gear, 25' ... revolving shaft, 26a, 26
a ': revolving clutch, 52, 52': counter shaft, 5
3, 53 ': gear, 60: output shaft, 61: drive gear, 6
2 external gear, 63 mounting member, 64 internal gear, 65 central gear, 66 planetary gear, 67 intermediate gear, 68 intermediate gear, 69 gear, 71 rotating drum, 72 partition member, 73, 73 '... left and right turning cylinder chambers, 74, 74'
... piston, 75, 75 '... disk, 76, 76' ...
Gear, 77, 77 '... disk, 78, 78' ... gear,
79: passive passive gear, 80: brake shaft, 81: left brake, 81 ': right brake, 82: brake cylinder, 83 ...
Partition member, 84, 84 '... left and right cylinder chambers, 85, 8
5 ': piston, 86, 86', 87, 87 ': disk, 88, 88': gear.

Claims (1)

[Claims] In a transmission mechanism of a traveling device, the power of an engine is shifted, and the shifted power is transmitted to left and right axles via a clutch and a differential mechanism. A transmission mechanism for a traveling device of a working machine, characterized in that the transmission is controlled by means and the vehicle can be turned by changing the rotation ratio of the left and right axles.