JPS6313932Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to the configuration of a differential gear case, which constitutes a differential gear device, or a differential device for short, used in an agricultural tractor, and a differential ring gear.

(b) Prior Art The technology of a differential case that simply constitutes a differential gear device for an agricultural tractor has been well known.

For example, as in Japanese Utility Model Application Publication No. 55-171625.

Furthermore, as shown in FIG. 2, conventionally, the differential gear case 26 is bowl-shaped, and the lid part uses the boss part of the differential ring gear 25 to form the differential gear case as a whole, and the differential side gears 9L and 9R are also formed on one side by the differential gear case. 26, but the other was supported at the boss portion of the differential ring gear 25.

For this purpose, the differential gear case 26 and the differential ring gear 25 have their differential side gear bearing surfaces machined separately.
It was assembled into an integrated differential gear case.

Therefore, the linearity of the left and right differential side gear bearing surfaces and the bearing surfaces of the front axle cases 1 and 2 to the differential gear case support walls 1 m and 2 m cannot be achieved, and there is a possibility that the axis center will be misaligned during assembly. Between the side gears 9L and 9R, there is a bearing metal 27.
Without the addition of 28, mutual rotation would not be possible.

In this way, conventionally, the differential gear case was assembled into one unit from two parts, so when assembled, the axes may not match or the axes may be bent, resulting in problems with the gear system. This resulted in resistance to rotation and excessive force being applied to the bearings.

(c) Problems that the invention aims to solve The differential gear case has a differential ring gear fixed on the outside and a differential pinion and differential side gear meshed inside. This is a part that requires precise assembly precision. In addition, since it is a part that supports the end of an output shaft such as an axle that projects left and right, a differential side gear shaft, or a front axle shaft, strength is also required.

The present invention has a differential gear case with a cross-sectional shape,
The left and right bearing bearing surfaces are integrally constructed, and the bearing surfaces to the external bearing support wall and the bearing surfaces to the internal differential side gear are both integrally machined at the same time to align the axes.

In addition, whereas conventionally the differential pinion and differential side gear were separated to be inserted into the interior of the differential gear case, by creating a large opening on the side of the differential gear case, it is now possible to insert and assemble the differential pinion and differential side gear from there. It is something.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

The differential gear case 11 is attached to the support surfaces 11f and 11g on the left and right differential gear case support walls 1m and 2m.
The ring gear 3 is integrally formed with a flange 11e that has a cross-sectional shape, and openings 11c and 11c are provided on the front and rear surfaces into which the differential side gears 9L and 9R and the differential pinions 8 and 8 can be inserted.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is a front sectional view of a front wheel drive device of an agricultural tractor.

Front axle cases 1 and 2 are connected near the center to form a single front axle case, and the center part of the front axle case 1 on the right side in the direction of travel is bulged to form a differential case.
Center pin insertion hole 1 is provided in the upper part of the differential case part.
A is provided. Front axle case 2.1 on left and right front axle case 2.1
Rotation stoppers 2d and 1d are provided in a protruding manner as contact parts to the front axle bracket when the front axle bracket rotates, and a lubricating oil filler port 1g is provided in the front axle case 1 on the right side to supply lubricating oil to the entire front wheel drive device.
is provided, and an oil dipstick and lubrication tap 4 is provided.

Power is transmitted from a front wheel power transmission shaft, and a pinion gear at the tip of the front wheel power transmission shaft meshes with a ring gear 3 of a differential device.

The ring gear 3 is fixed to the differential gear case 11 and rotates the differential gear case 11. A pinion pin 7 is fitted into the differential gear case 11, and the differential pinions 8 and 8 are attached to the pinion pin 7.
is fitted.

Differential pinion 8, 8, left and right differential side gear 9
If L and 9R are always in mesh and the rolling resistance of the left and right front wheels is the same, the differential pinions 8 and 8 will not rotate, and only the differential gear case 11 will revolve and the left and right rotations will be the same to the front axle shafts 10L and 10R. When a difference in rolling resistance occurs between the left and right front wheels, the differential pinions 8 and 8 rotate, creating a rotation difference between the left and right front axle shafts 10L and 10R.

Power is transmitted from the front axle shafts 10L and 10R to a bevel gear 12 at the end, the bevel gear 12 is always meshed with a bevel gear 13 fixed on a king pin 14, and power is transmitted via the king pin 14 to a bevel gear 15 at the lower end. The bevel gear 15 is always in mesh with the bevel gear 17, and the bevel gear 17 is fixed to the axle 18.
Rotate 9.

The above is the power transmission system.The front wheels need to be rotated around the king pin 14 for steering, and in order to be able to rotate while transmitting power, the front axle case 1 and 2 ends A fixed gear case 5 is fixedly installed, and a rotating gear case 6 is installed below it.
A rotary gear case 6 is made rotatable around a king pin 14. This rotary gear case 6 is rotated by a knuckle arm 21, whose center of rotation is the same as the center of the king pin 14, and a pivot pin 22a is provided protruding from the lid 22 of the fixed gear case 5. ing.

The tip of the Katsukuru arm 21 is the rotating gear case 6
It is fixed to the upper mounting surface. 23 is the axle 18
This bearing case is fixed to the outer surface of the rotating gear case.

When adding lubricating oil to a front wheel drive device having such a configuration, the oil dipstick/oil filler plug 4 is removed and the lubricating oil is gradually poured in from there. The lubricating oil flows from the lubricating oil passage 1c of the differential gear case supporting wall 1m of the front axle case 1 to the differential gear case supporting wall 2m of the front axle case 2.
The lubricating oil passage 2 provided under the bearing at the outer end of the front axle case 2 passes through the lubricating oil passage 2a of the
It enters the lubricating oil passage 5a of the fixed gear case 5 from c, passes between the outer periphery of the king pin and the narrow part of the fixed gear case, and enters the rotating gear box.

A portion of the oil enters the drain reservoir 6f below the bearing of the rotary gear box 6, and the remaining oil gradually raises the oil level and ascends through the chamber of the bevel gear 17.

However, the upper part of the chamber of the bevel gear 17 is sealed and there is no escape route for air, so the oil level will not rise if this continues. Therefore, an air vent hole is provided, and an air vent bolt 20 is screwed into the hole, which is removed when lubricating.

Also, when the oil level approaches the lower limit position indicated by B, the lubricating oil passages 1c and 1 of the front axle cases 1 and 2
2a is also closed, and if there is no air vent hole in the left half, lubricating oil will no longer enter the left half, so air vent passages 1d and 2b are also provided at the top of the front axle cases 1 and 2, and from here Air recirculates inside the front axle case 1,
It escapes to the atmosphere from the oil filler port. A is the upper limit of the lubricant level, and B is the lower limit. Also, arrow D indicates the flow of lubricating oil. The C arrow indicates the air flow.

FIG. 3 is an enlarged front sectional view of the front differential device of the present invention, FIG. 4 is a plan view of the differential gear case 11,
Figure 5 is a cross-sectional view taken along line R-R in Figure 6, Figure 6 is a front sectional view of the differential gear case, and Figure 7 is S in Figure 6.
-S cross-sectional view, FIG. 8 is a side view of the differential ring gear 3, and FIG. 9 is a front sectional view.

In the present invention, as shown in the enlarged sectional view of FIG. 3, the differential gear case 11 is configured to have a cross-sectional shape, and the differential gear case 11 is supported on the bearing support surfaces 11a and 11b of the differential side gears 9L and 9R and the differential gear case support surfaces 1m and 2m. Surfaces 11f and 11g are provided on both the left and right sides of the differential gear case 11.

Further, the differential ring gear 3 consists only of gear teeth, and a flange 11e is provided protruding from the differential gear case 11 so that the boss portion can be replaced by the differential gear case 11, and is fixed to and integrated with the flange 11e.

Also, since there is no longer an opening on the side of the differential gear case, the front and rear surfaces are configured with a large opening 11c, into which the differential side gears 9L and 9R and the differential pinions 8 and 8 are inserted, and the differential pinion pin 7 and front axle are inserted from the outside. It is configured to insert and assemble the shafts 10L and 10R.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, when the differential gear case is divided into left and right parts, and the differential side gear and differential pinion are integrated after insertion, as in the conventional differential gear case described in Japanese Utility Model Application Publication No. 55-171625, Since the support surfaces for the left and right differential gear case support walls are provided separately, the axes may not match up or the axes may be bent, causing the bearings to fail when the entire differential gear device rotates. Distortion and rotational resistance were occurring.

In the present invention, the bearing surfaces 11f and 11g of the differential gear case support walls 1m and 2m of the differential gear case 11 are integrally configured and processed, so that the shaft center will not shift, and when the differential gear case 11 rotates, the bearings will not be distorted or rotated. This is achieved without the generation of resistance.

Second, since the bearing support surfaces 11a and 11b on the outer periphery of the left and right differential side gears 9L and 9R are also integrally formed with the differential gear case 11, the axis position will not shift, and there is no need to provide separate bearings. This makes it possible to support differential rotation by bearings without uneven wear occurring only on the bearing support surfaces 11a and 11b of the differential gear case 11.

Thirdly, the front and rear surfaces of the differential gear case 11 are largely opened to provide insertion holes for the differential side gears 9L and 9R and the differential pinions 8 and 8, so that the differential side gears 9L and 9R and the differential pinions 8 and 8 are integrated. It is easy to assemble by simply fitting it into the differential gear case 11, and assemble the differential side gears 9L and 9R and the differential pinions 8 and 8, just like in the past.
After the differential gear case 11 is assembled into a half case, it is no longer necessary to perform adjustments such as axis alignment when assembling the left and right differential gear cases again.

[Brief explanation of the drawing]

1 is a front sectional view of the front wheel drive device, FIG. 2 is a rear sectional view of a conventional front differential device, FIG. 3 is an enlarged front sectional view of the front differential device of the present invention, and FIG. 4 is a front sectional view of the differential gear case 11. A plan view, FIG. 5 is a sectional view taken along line RR in FIG. 6, FIG. 6 is a front sectional view of the differential gear case, FIG. 7 is a sectional view taken along line S-S in FIG. 6, and FIG. 8 is a differential ring gear. FIG. 9 is a front sectional view. 1, 2...Front axle case, 1m, 2
m...Differential gear case support wall of front axle case, 11...Differential gear case, 11a, 11
b...Bearing support surface of differential side gear, 11c...
Front and rear openings, 11e...flange, 11f・1
1g...Supporting surface to the differential gear case support wall, 3...
...Differential ring gear.

Claims (1)

[Scope of utility model registration request] The differential gear case 11 is attached to the support surfaces 11f and 11g on the left and right differential gear case support walls 1m and 2m.
and a flange 11e for fixing the ring gear 3 are integrally configured to have a cross-sectional shape, and openings 11c and 11c are provided on the front and rear surfaces into which the differential side gears 9L and 9R and the differential pinions 8 and 8 can be inserted. A differential device for agricultural tractors.