Shift gear replacement in place to prevent falling off presets
1 Reasons for the shifting of the shifting gear shifting mechanism The main reason for the shifting of the shifting gear shifting mechanism is that the spline fit clearance is large and the spline stress point deviates from the spline center.
As shown in Fig. 1, when the gear is stressed, the gear is tilted due to the presence of the spline hole and the spline shaft. The force point A on the left side of the spline (point A represents the spline of the left spline. The set of stress points on the surface is displaced when it reaches the A position after the rotation 180, and the axial force FA to the right is generated. The right side of the spline is the force point B (the point B represents the right side of the spline midpoint spline) The set of the force points on the force surface) is displaced after reaching 180 and the displacement is generated. The axial force FB.FA and FB are proportional to the force on the key side, and the gear is biased to the left end. The force on the left side of the spline is greater than the force on the right side of the spline, so that FA is greater than FB, and when the difference is greater than the locking force of the spring, the gear is slipped and disengaged.
2 The improved design example is the power output structure of the CF35 series tractor (hooking in the low gear state), which is also the typical structure of the tractor power output slip gear shifting. When the sliding gear moves to the left to hang the low gear, since the force at the point A is greater than the force at the point B, the axial force FA is greater than the axial force FB, and when the difference is greater than the spring locking force, the sliding gear Sliding to the right produces disengagement: Similarly, when the sliding gear is hung to the right, because the force at point B is greater than the force at point A, the axial force FB is greater than the axial force FA, when the difference is When it is larger than the spring locking force, the sliding gear slides to the left to cause the shift.
The improved structure is shown in the section line of the middle spline shaft, and the CD section of the spline shaft is pressed into the side of the CD section by 0.10.2 mm (the part of the spline shaft that is sectioned), when the sliding gear moves to the left. In the low speed gear, only the side of the AC segment is stressed, the force point of the spline is the midpoint of the gear, slightly to the right end of the midpoint of the force spline, and the force at the C point is greater than the force at the point A. The axial force FC is greater than FA and does not cause a shift. When the sliding gear moves to the right and the high speed gear is moved, only the side of the DB segment is stressed, and the force point of the spline is slightly biased to the left end of the midpoint of the force spline, which does not cause the dislocation.
3 Ending the method described in this article can be applied to all tractor slip gear shifting structures. Especially for small four-wheel tractors with belt transmission, the transmission gearbox and power output disengagement rate are high due to the low precision of spline machining. The use of interlocking devices or sleeve shifting devices can prevent the removal of gears, but it is bound to increase the cost of small tractors with low prices. By adopting the method described in this paper, the problem of the shifting of the shifting gear shifting device is effectively solved without increasing the cost.
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