Engine speed-regulation gear mounting structure

Abstract

The invention discloses a speed regulating gear installation structure of an engine. A mandrel collar, a speed regulating gear, a flat pad and a speed regulating gear pressing plate are sequentially installed on the speed regulating mandrel, and one end of the speed regulating mandrel is pressed into the speed regulating mandrel by a press. Inside the gear plate. A locating sleeve is arranged on the crankcase cover, and the locating sleeve is located in the through hole of the speed regulating gear pressure plate bolt, and the fastening bolt passes through the positioning sleeve to fix the speed regulating gear pressure plate and the crankcase cover. The invention can improve the matching precision of the speed-regulating gear and the camshaft gear, so that the gap between the teeth of the two gears and the axial movement of the speed-regulating gear can be effectively controlled and the operation requirements of workers can be reduced.

Description

Technical field [0001] The invention relates to a mounting structure of an engine speed regulating gear. Background technique [0002] The purpose of the speed control gear is to mesh with the camshaft gear to change the engine speed. The general installation method is shown in Figure 1: First, fix the speed-adjusting gear 4 on the speed-adjusting mandrel 5, and then put the speed-adjusting mandrel 5 into the pre-set mandrel positioning groove on the crankcase cover 1. The upper speed-regulating gear pressing plate 2, the positioning notch 9 on the speed-regulating gear pressing plate 2 is locked into the positioning boss 10 on the crankcase cover 1, and the speed-regulating gear pressing plate 2 is embedded in the limiting groove on the speed-regulating spindle 5 to prevent The speed control mandrel 5 moves axially, and then the speed control mandrel 5 is clamped between the speed control gear pressing plate 2 and the crankcase cover 1 by the tightening bolt 7, thereby installin...

AI Technical Summary

Problems solved by technology

The existing installation method is difficult to prevent the axial movement of the speed regulating mandrel (or the speed regulating gear), and at the same time, the meshing gap between the speed regulating gear and the camshaft gear cannot be well controlled. This is because: 1. Although through the speed regulating The gear pressing plate 2 is embedded in the limit groove on the speed regulating mandrel 5 to prevent the speed regulating mandrel 5 from moving axially. The limit is dead, that is, the speed regulating mandrel 5 will still produce axial movement relative to the speed regulating gear pressure plate 2; 2. The size of the positioning hole on the speed regulating gear pressure plate 2 will be slightly larger than the size of the fastening bolt for ease of assembly Therefore, before the speed regulating gear pressure plate 2 is fixed, the speed regulating gear pressure plate 2 may move forward, backward, left, and right relative to the crankcase cover 1, that is, the positional relationship between the two is not fixed.

[0003] Although the movement caused by the above two reasons is very small, the superposition of the two will have a relatively large impact on the meshing clearance between the speed regulating gear and the camshaft gear, which requires high matching precision, and affect the use of parts life, and increase the engine speed fluctuation rate

Moreover, the existing installation method relies entirely on manual operation, and the gap between the teeth of the two gears is greatly affected by the operator, so the proficiency of the workers and the installation requirements are high, otherwise it is difficult to ensure the consistency of the product

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