JPS5946812B2 - Transmission case in tractor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the mounting center alignment of a differential case that pivotally supports a bevel gear for wheel drive on a tractor, and a transmission case that pivotally supports a bevel pinion that meshes with this bevel gear. This relates to a transmission case that can be improved.

In conventional systems, the meshing position of the bevel pinion and bevel gear is adjusted by adjusting the thickness and number of shims that are fitted into the respective shaft supports of the bevel pinion and bevel gear, thereby ensuring smooth meshing. Appropriate backlash was provided.

However, such shim adjustment is a tedious task of checking the engagement status of both gears while inserting or removing the shim into the shaft support, which takes a lot of time. This is the current situation.

Therefore, the present invention has been devised to make it extremely easy to adjust the tooth contact of both gears.The configuration will be explained based on the first embodiment shown in the figures. The rotation of the input shaft 1 to be driven is changed by the transmission gear group 3I in the mission case 2, and the bearings 4, 5, 6 of the transmission case 2
A drive pinion shaft 8 is provided so that the bevel pinion 7 on the ridge protrudes rearward from the transmission case 2, and is rotatably driven by the transmission gear group 3j. The bevel gear 9 that drives the wheels is supported by the differential case 10E, and the differential case 1
The LJj transmission case is configured such that the mounting flange 10a provided around the front end opening of the transmission case 2 is joined to the mounting flange 2a provided around the rear end opening of the transmission case 2, and the bevel gear 9 is engaged with the bevel pinion 7. %3rd in
As shown in Figure I, installing the differential case 10 7 langes 10
Insert the dowel pin 11 in the lower part of the transmission case 2, and as shown in FIG.
This is the dowel pin hole 2b.

Then, as shown in Fig. 4 A1B, a rotor 12 having a bolt head 12a and a cylindrical part 12b is formed, and a circular shape is eccentrically eccentric with respect to the column center of the cylindrical part 12b. An eccentric hole 12C is opened in the columnar part 12b, and the rotor 12 is attached to the mounting flange 2ag at the t part on the opposite side from the knock pin hole 2b so that the eccentric hole 12C opens rearward. A snap ring 13 is fitted to the cylinder HB12b which is rotatably fitted and protrudes from the mounting flange 2a to prevent it from coming off in the front-back direction.

Further, as shown in FIG. 5A, a guide pin 14 is formed in the front part of the mounting part 14a, and is provided with a guide part 14b having a flat cross section that can be fitted into the mating core hole 12c. Mounting flange 10 in one part on the opposite side
Fit the mounting part 14a of this guide pin 14 into J.
:, make the guide part 14b protrude forward from the front end surface of the mounting flange 10a so that the downward direction is flat, and fit the knock pin 11 of the differential case 10 into the knock pin hole 2b of the transmission case 2 to join the mounting flanges 2a and 10a. When the rotor 12 is attached, the eccentric hole 12C of the rotator 12 loosely fits into the guide portion 14b of the guide pin 14 and the rotor 12 is rotated, the eccentric hole 12C rotates and the guide pin 14 is rotated. The differential case 10 is rotated slightly in the left-right direction about the dowel pin 11 that serves as a pivot point relative to the mission case 2, and the bevel pinion 7 on the mission case 2 side and the bevel gear "9" on the differential case 10 side are rotated slightly. This is a fine adjustment mechanism that allows the meshing position of the two to be adjusted minutely.

After the rotation adjustment of the rotor 12 is completed, a lock bolt 15' screwed into the outer periphery of the mounting flange 2a is used to prevent the rotor 12 from being driven.

Note that, contrary to the embodiment shown in FIG.
Alternatively, the dowel pin 11 and the dowel pin hole 2 may be provided.
Even if the rotor 12 and the guide pin 14 are provided at the lower part while the rotor b is provided on the hill, the same effect as in the example shown in FIG. 1 can be obtained.

In addition, as another embodiment of the fine adjustment mechanism shown in FIG.
As shown in the figure, if the rotor 16 equipped with the eccentric pin 16b having a circular cross section that is eccentric by the amount of eccentricity with respect to the cylinder FiB 16a is arranged, this cylinder part will be placed on the mission case 2 side. A cylindrical guide pin 17 that is rotatably fitted into the center of the differential case 16 and has a vertically long hole 17a in which the L-shaped core pin 16b can freely move as shown in Figure 7 A1 is attached to the mounting flange of the differential case 10. 10a to attach the mounting flange 2a.
10a and insert the eccentric pin 16b' into the elongated hole 17a, the eccentric pin 16b will slide up and down in the elongated hole 17a as the rotor 16 rotates, while the guide Since the pin 17 is an eccentric pin 16b, it may be configured to be able to rotate slightly left and right about the knock pin 11.

Since the transmission case of the tractor according to the present invention is constructed as described above, when assembling the transmission case, the notch holes 2b of the transmission case 2 in which the bevel pinion 7 is incorporated are inserted into the differential case 10 in which the bevel gear 9 is incorporated. When the dowel pin 11 is inserted, the eccentric hole 12C of the rotator 12 is inserted into the guide portion 14b of the guide pin 14, and the bolt head 12a is turned with a spanner I, the old The guide portion 14b, which is flattened in the downward direction, can be slightly rotated left and right around the dowel pin 11, and in this way, the meshing position between the bevel pinion 7 and the bevel gear 9 can be adjusted slightly. It will become.

The fact that the tooth contact can be easily adjusted in this way is the same in the embodiments using the combination of the rotator 16 and the guide pin 17 shown in FIGS. 6 and 7. By adjusting the rotation angle of the rotator mentioned above, it is extremely easy to set a suitable backlash, and furthermore, the backlash value can be adjusted steplessly according to this rotation angle. It is very convenient because it can be done.

[Brief explanation of drawings]

Fig. 1 is a side view of a tractor to which the transmission case of the present invention is applied, Fig. 2A is a longitudinal sectional side view of the main part of the same transmission case,
The opening in the figure is a sectional view taken along line A-A in figure A, Figure 3 is a perspective view showing the disassembled state of the transmission case, and Figures 4 A and d.
FIG. 6A is a front view showing each embodiment of the rotator used in this invention □, FIG. 4 and FIG. 6 are a side view in FIG. Figure A is a front view of the guide pin used in the present invention, and Figures 5 and 7 are side views in Figure A, respectively. Code explanation % 1... Input shaft % 2... Mission case, 2a, 10a... Mounting flange, 2b... Dowel pin hole % 3'... ...
Gear group, 4, 5.6...Bearing, 7
...Bevel pinion, 8...Drive pinion shaft, 9...Bevel gear, 10.
... Differential case, 11 ... Dowel pin,
12゜16...Rotator, 12a...Bolt head, 12b. 16a...Cylindrical part, 12c...Eccentricity L
13...Snap ring, 14,17...
··guide pin. 14a... Mounting part, 14b... Guide part, 15... Lock bolt, 16b...
・Eccentric pin, 11a... Long hole, D...
Amount of eccentricity.

Claims (1)

[Claims] 1. A transmission case with a structure in which a bevel pinion that is pivotally supported on a mission case meshes with a bevel gear that is pivotally supported on a desk that is attached and attached to this mission case.
Here, a rotation fulcrum is provided on either side of the hill below the joint surface l to allow the transmission case to rotate in the left-right direction relative to the differential case, and the joint 1 on the side opposite to this rotation fulcrum is 1. A fine adjustment mechanism consisting of either an eccentric hole in the rotor and a guide pin that can be fitted into the eccentric hole, or an eccentric pin in the rotor and a long hole in the guide pin that can be fitted into the eccentric pin is installed in the mission case. A transmission case for a tractor, characterized in that the transmission case is configured to be provided in the differential case so that the differential case is rotated relative to the transmission case by rotation of a rotor, thereby slightly adjusting the meshing position of the bevel pinion and the bevel gear.