JPH0516685A - Differential gear for tractor, etc. - Google Patents

Abstract

PURPOSE:To miniaturize a differential gear for use in a tractor, etc., and to reduce the cost of the differential gear by using right and left differential side gears in common. CONSTITUTION:The differential gear of a tractor, etc., comprising differential side gears 3, 4 engaged with the right and left sides of a differential pinion gear 2 disposed inside a driven differential gear case 1, and a differential lock clutch 6 provided between the differential gear shaft 5 of the differential side gear 3 and the differential gear case 1, the lock clutch 6 being freely switched from its engaged state to its disengaged state and vice versa.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diff device such as a tractor. It can be used not only for four-wheel traveling mode but also for two-wheel traveling mode traveling transmission device, and further for transmission device for work shaft of agricultural work management machine such as cultivator.

[0002]

2. Description of the Related Art In a diff device used for transmitting a wheel of a tractor or the like, diff side gears meshing with the left and right sides of a pinion gear housed inside a diff case have different forms. The diff gear is supported on the diff shaft, and the diff lock clutch is provided between the diff side gear and the diff case. As a diff device, the diff gear tends to be large, and the left and right diff gears are manufactured separately. ..

[0003]

According to the present invention, the differential side gears 3 and 4 are meshed with the left and right sides of a differential pinion gear 2 disposed inside a driven differential case 1, of which the differential side gear 3 on one side is differential. A diff device such as a tractor is provided with a diff lock clutch 6 between the shaft 5 and the diff case 1, which can be selectively engaged and disengaged.

[0004]

By the driving of the differential case 1, the pair of left and right differential side gears 3 and 4 are differentially rotated via the differential pinion gear 2. When the diff lock is performed, by engaging the diff lock clutch 6, the diff shaft 5
The differential case 1 and the differential case 1 are integrally rotated and differentially locked, and differential transmission is not performed.

Since the differential lock clutch 6 is engaged and disengaged between the differential shaft 5 and the differential case 1 as described above, the pair of left and right differential side gears 3 and 4 simply rotate integrally with the differential shaft. The configuration is simple because the same gear can be manufactured as the same gear to reduce the cost, and the form of the differential case covering the outer peripheral surfaces of the differential side gears 3 and 4 from the left and right outer surfaces is unnecessary. It can be miniaturized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The example shown in the figure shows the case where the present invention is applied to an agricultural work management machine. 1 to 3, in the transmission case 7, the engine 8 is mounted on the above, and a pair of left and right differential shafts 9,
5 is mounted on the shaft, and the chain 12 is transmitted between the drive shaft 11 driven by the engine 8 via the gear 10 and the differential case on the differential shaft 9 and 5 cores. Reference numeral 13 is a sprocket on the drive shaft 11 side, and 14 is a sprocket on the differential case 1 side.

The differential shafts 9 and 5 are coaxially and rotatably supported by a shaft pin 15, and the differential side gears 4 and 3 of the same shape are fixed to the inner ends of the differential shafts 9 and 5 to be integrated. It is a rotating structure. Also, on this one side differential shaft 5,
The diff lock clutch 6 fitted with the spline is the spring 1
6 is constantly repulsed to the outside so that the differential lock clutch 6 and the differential case 1 can be engaged or disengaged by axial movement.

The diff case 1 is formed in a cylindrical shape on the outer circumference of a diff pinion gear 2 meshed between the left and right diff side gears 4 and 3, and has the sprocket 14 formed on the outer circumferential surface thereof, and the diff lock clutch 6 has a side surface facing the diff lock clutch 6. The clutch engagement part 17 is formed. A diff lock shifter 18 for operating the diff lock clutch 6 is pivotally attached 19 to the inside of the transmission case 7, and is interlocked with an operation handle 22 through a diff lock arm 20 on the upper portion of the transmission case 7 and a rod 21.

The differential shafts 9 and 5 are borne by the left and right side portions of the transmission case 7, and the mounting shaft portion 23 is projected at the outer end so that wheels can be mounted or the work shaft 24 can be connected.
As the working shaft 24, the cult nail 25 and the cult disc 2 are used.
Wear 6 etc. Reference numeral 27 is an engine starter, 28 is a fuel tank for the engine 8, 29 is a muffler, 30 is a fender, 31 is a handle frame, and 32 is an inlet tube extending rearward along the handle frame 31. 33 is a resistance rod provided at the rear of the transmission case 7,
Reference numeral 4 is a throttle lever, and 35 is a stop switch for stopping the engine 8.

4 and 5, the difference from the above example is that
The transmission mechanism in the transmission case 7 is a shaft transmission mechanism based on the vertical axis 36 instead of the chain 12 transmission mechanism, and a deadman clutch lever 37 is provided on the handle 22. From the clutch shaft 38 of the engine 8 to the centrifugal clutch 3
The vertical axis 36 is driven via 9 and the worm gear 41 is transmitted from the lower end of the vertical axis 36 to the worm wheel gear 40 on the peripheral surface of the differential case 1 to transmit the differential shafts 9 and 5.

In the management machine in which power is transmitted by the centrifugal clutch 39, the throttle wire 4 is rotated by rotating the throttle lever 34 in the handle 22.
3 is configured to shift from the idling position N to the low speed position L and the high speed position H, and the receiving arm 45 of the outer wire 44 of the throttle wire 43 is moved to the centrifugal clutch 39 engagement position O of the deadman clutch lever 37.
N and cutting position OFF operation and lever mechanism 46 interlock,
When the disengaged position of the centrifugal clutch 39 is OFF, the throttle wire 43 is loosened, and when the engaged position is ON, the throttle wire 43 is pulled. Reference numeral 47 is a return spring of the receiving arm 45. Reference numerals 48 and 49 are stoppers that lock the rotation position of the receiving arm 45. 42 is an operation panel. Reference numeral 50 is a support shaft of the receiving arm 45, and 51 is a support shaft of the throttle lever 34 and the deadman clutch lever 37.

Since the receiving arm 45 is pulled toward the stopper 48 by the spring 47 and works to loosen the outer wire 44, the deadman clutch lever 37 is
Since the clutch disengaged position is OFF, the engine 8 is rotating at a low speed and the centrifugal clutch 39 is disengaged. or,
When the deadman clutch lever 37 is gripped to turn the clutch into the ON position, the outer wire 44 is pushed by the receiving arm 45 and the throttle wire 43 is stretched, so that the engine 8 rotation speed increases and the centrifugal clutch 39 is in the on state. You can work.

The throttle lever 34 can be operated independently of the deadman clutch lever 37 to adjust the rotation of the engine 8.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a front sectional view of a transmission case portion.

FIG. 2 is a side view of a part thereof.

FIG. 3 is a perspective view of the entire work machine.

FIG. 4 is a side cross-sectional view of another embodiment.

FIG. 5 is a side view of the handle operating portion.

[Explanation of symbols]

 1 differential case 2 differential pinion gear 3 differential side gear 4 differential side gear 5 differential shaft 6 differential lock clutch

Claims (1)

Claims: 1. Differential side gears 3, 4 are provided to the left and right of a differential pinion gear 2 disposed inside a driven differential case 1.
The differential shaft 5 of one of the differential side gears 3
A diff device such as a tractor having a diff lock clutch 6 that is switchable between occlusion and separation between the diff case and the diff case.