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Crank assembly method of two-stroke engine

An assembly method and engine technology, applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve the problem of large axial movement of the crankshaft, and achieve the effect of reducing failure, reducing the possibility of failure, and good lubrication

Active Publication Date: 2009-09-30
CHONGQING ZONGSHEN ENGINE MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem of large axial displacement of the two-stroke engine crankshaft, and provide a two-stroke engine crankshaft assembly method that controls the axial displacement of the crankshaft to 0.03-0.12mm

Method used

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  • Crank assembly method of two-stroke engine
  • Crank assembly method of two-stroke engine
  • Crank assembly method of two-stroke engine

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: as Figure 1 to Figure 4 As shown, a two-stroke engine crankshaft assembly method is characterized in that the method is carried out as follows: (1) press two bearings 4 onto the left and right crankshaft handles respectively, so that the inner ring of the bearing and the crankshaft are in an interference fit (2) Assemble the crankshaft 1 to the left crankcase 2 and the right crankcase 3, so that the outer rings of the left and right bearings on the crankshaft are in interference fit with the left and right crankcases respectively.

[0034] Assemble in step (2) as follows:

[0035] a. After heating the bearing hole of the left crankcase 2 to 110°C, assemble the crankshaft 1 to the left crankcase 2 within 2 seconds;

[0036] b. After heating the bearing hole of the right crankcase 3 to 110°C, assemble the right crankcase 3 to the left crankcase 2 within 2 seconds.

[0037] In steps a and b, the bearing hole is heated to 110° C. by partially energizing the...

Embodiment 2

[0041] Embodiment 2: as image 3 As shown, a two-stroke engine includes a left crankcase 2 and a right crankcase 3, the crankshaft 1 arranged on the left and right crankcases 2, 3 and the crankshaft 1 arranged on the crankcase 1 Two bearings 4, characterized in that: the inner ring of the bearing 4 is interference fit with the crankshaft 1, and the outer ring of the bearing 4 is interference fit with the left and right crankcases 2, 3, and the tolerance range 0.017-0.047mm.

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Abstract

The invention relates to a crank assembly method of a two-stroke engine. The method is carried out by the following steps that: (1) two bearings are respectively pressed on the handles of a left crank and a right crank to realize interference fit between the inner rings of the bearings and the cranks; and (2) the cranks are arranged on a left crank box body and a right crank box body to ensure that the outer rings of the left bearing and the right bearing on the cranks are in interference fit with the left crank box body and the right crank box body respectively. Meanwhile, the invention also relates to a two-stroke engine with both inner ring and outer ring in interference fit. When adopted to assemble cranks, the crank assembly method ensures that axial float of the cranks can be controlled within a reasonable scope so as to realize effective lubrication of crank bearings; therefore, the two-stroke engine has high operating reliability.

Description

technical field [0001] The invention relates to a method for assembling a crankshaft of a two-stroke engine, in particular to a method for assembling a bearing of the two-stroke engine by using heating. Background technique [0002] In the prior art, the crankshaft of a two-stroke engine is assembled in the following steps: 1. Press the right crankshaft bearing onto the right crank of the crankshaft in a conventional manner; 2. Press the left crankshaft bearing into the bearing hole of the left crankcase body in a conventional manner ;3. Assemble the crankshaft that has been press-fitted with the right crankshaft bearing to the left crankcase normally; 4. Combine the right crankcase and the left crankcase. Wherein: the right crankshaft bearing and the right crankcase are clearance fit; the left crank and the left crankshaft bearing are clearance fit. However, with such an assembly method, the crankshaft will move a lot in the axial direction. During the working process of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P19/04
Inventor 卢佳李方鹏
Owner CHONGQING ZONGSHEN ENGINE MFG
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