Two-stroke engine crankshaft tail end bearing sealing structure

Abstract

The utility model discloses a two-stroke engine crankshaft tail end bearing sealing structure which comprises a crankcase, a ball bearing with a contact type sealing cover, an O-shaped ring and a crankshaft and is characterized in that the ball bearing with the contact type sealing cover is assembled in the crankcase in an interference mode, and the O-shaped ring is assembled in a groove of the crankshaft and limited through a circular bead and a cylindrical surface. The ball bearing with the contact type sealing cover is installed on the crankshaft in a clearance fit mode. By the adoption of the crankshaft tail end bearing sealing structure, the crankshaft of an engine can be simply assembled, and meanwhile shaft end sealing is achieved.

Description

Technical Field

[0001] The present invention relates to a sealing structure for the bearing at the end of the crankshaft of a two-stroke engine. Background Art

[0002] The two-stroke engine is an important power type for the UAV system, which puts forward higher requirements for the weight and light weight of the engine and each subsystem. The crankshaft system is an accessory system that is an important part of the two-stroke engine. In order to shorten the length of the crankshaft, one or more ball bearings with contact seals are usually used. The assembly method is mostly that the outer ring is interference-fitted on the crankcase, and the inner ring is interference-fitted by cold-fitting the crankshaft, and at the same time, the shaft end seal is realized. This leads to difficult assembly of the crankshaft of the two-stroke engine and cumbersome assembly process. As a result, the engine has poor maintenance performance.

[0003] In view of the above problems, the present invention provides a sealing structure for the bearing at the end of the crankshaft of a two-stroke engine. Summary of the Invention

[0004] The purpose of the present invention is to provide a sealing structure for the bearing at the end of the crankshaft of a two-stroke engine.

[0005] In order to achieve the above purpose, the present invention is implemented as follows: A sealing structure for the bearing at the end of the crankshaft of a two-stroke engine, including a crankcase, a ball bearing with a contact seal, an O-ring, and a crankshaft, is characterized in that: the ball bearing with a contact seal is interference-fitted in the crankcase, the O-ring is assembled in the groove of the crankshaft and is limited by a fillet and a cylindrical surface, and the ball bearing with a contact seal is installed on the crankshaft by clearance fit. Sealing is achieved through the interference of the outer ring of the ball bearing with a contact seal and the cooperation of the inner ring O-ring.

[0006] Preferably, the sealing structure for the bearing at the end of the crankshaft is characterized in that: the crankshaft is provided with a groove, and a fillet and a cylindrical surface are provided in the groove, and the O-ring is limited by the fillet and the cylindrical surface.

[0007] Preferably, the sealing structure for the bearing at the end of the crankshaft is characterized in that: the outer ring of the ball bearing with a contact seal is interference-fitted in the crankcase, and the inner ring is assembled on the crankshaft with a clearance.

[0008] Preferably, the ball bearing must be a ball bearing with a contact seal.

[0009] In addition, a sealing structure for the bearing at the end of the crankshaft of a two-stroke engine includes the above-mentioned sealing structure for the bearing at the end of the crankshaft of a two-stroke engine, and is characterized in that: according to the following sequential steps:

[0010] (1) Install the ball bearing with a contact seal into the crankcase by press-fitting;

[0011] (2). Install the O-ring into the crankshaft groove.

[0012] (3). Install the crankshaft with the O-ring installed into the crankcase.

[0013] Beneficial effects:

[0014] A sealing structure for the end bearing of a two-stroke engine crankshaft of the present invention has the following remarkable advantages:

[0015] 1. The outer ring of the ball bearing with a contact-type seal cover is press-fitted into the crankcase, and the inner ring is clearance-fitted onto the crankshaft, with simple assembly.

[0016] 2. The outer ring of the ball bearing with a contact-type seal cover is selected for press-fitting and the inner ring is combined with an O-ring, having a certain sealing ability. Description of the drawings

[0017] Figure 1 It is a sealing structure for the end bearing of a two-stroke engine crankshaft;

[0018] Figure 2 It is a crankshaft structure diagram.

[0019] In the figure:

[0020] 1 - crankcase 2 - ball bearing with a contact-type seal cover

[0021] 3 - O-ring 4 - crankshaft

[0022] 41 - fillet 42 - cylindrical surface Specific embodiments

[0023] The present invention will be further described below in conjunction with the drawings and examples.

[0024] The basic idea of the present invention is to combine a sealing structure for the end bearing of a two-stroke engine crankshaft. By adopting the sealing structure for the end bearing of the crankshaft in this example, the engine can be easily assembled with the crankshaft, and at the same time, shaft-end sealing can be achieved.

[0025] Example: As Figure 1-2 shown, a sealing structure for the end bearing of a two-stroke engine crankshaft is provided.

[0026] Among them, a sealing structure for the end bearing of a two-stroke engine crankshaft includes a crankcase 1, a ball bearing 2 with a contact-type seal cover, an O-ring 3, and a crankshaft 4. It is characterized in that: the ball bearing 2 with a contact-type seal cover is press-fitted into the crankcase 1, the O-ring 3 is assembled in the groove of the crankshaft 4, and is limited by the fillet 41 and the cylindrical surface 42, and the ball bearing 2 with a contact-type seal cover is installed on the crankshaft 4 by clearance fit.

[0027] In this example, the sealing structure of the end bearing of the crankshaft is characterized in that: the crankshaft 4 is provided with a groove, and a fillet 41 and a cylindrical surface 42 are arranged in the groove, and the O-ring 3 is limited by the fillet 41 and the cylindrical surface 42.

[0028] In this example, the sealing structure of the end bearing of the crankshaft is characterized in that: the outer ring of the ball bearing 2 with a contact sealing cover is press-fitted into the crankcase 1, and the inner ring is assembled with a clearance on the crankshaft 4.

[0029] In addition, in this example, a sealing structure for the end bearing of a two-stroke engine crankshaft includes the above-mentioned sealing structure for the end bearing of a two-stroke engine crankshaft, and is characterized in that: in the following sequential steps:

[0030] (1) Install the ball bearing 2 with a contact sealing cover into the crankcase 1 by press-fitting;

[0031] (2) Install the O-ring 3 into the groove of the crankshaft 4;

[0032] (3) Install the crankshaft 3 with the O-ring 3 installed into the crankcase 1.

[0033] Beneficial effects:

[0034] The sealing structure of the end bearing of a two-stroke engine crankshaft of the present invention has the following remarkable advantages:

[0035] 1. The outer ring of the ball bearing 2 with a contact sealing cover is interference-fitted into the crankcase 1, and the inner ring is assembled with a clearance on the crankshaft 4, and the assembly is simple.

[0036] 2. The outer ring of the ball 2 bearing with a contact sealing cover is selected for interference fit and the inner ring O-ring 3 is used in cooperation, which has a certain sealing ability.

Claims

1. A sealing structure for the end bearing of a two-stroke engine crankshaft, comprising a crankcase (1), a ball bearing (2) with a contact-type sealing cover, an O-ring (3), and a crankshaft (4), characterized in that: The ball bearing (2) with a contact seal cover is press-fitted into the crankcase (1), and the O-ring (3) is assembled in the groove of the crankshaft (4) and is limited by the fillet (41) and the cylindrical surface (42). The ball bearing (2) with a contact seal cover is installed on the crankshaft (4) by clearance fit.

2. The crankshaft end bearing sealing structure according to claim 1, wherein: The crankshaft (4) is provided with a groove, and a fillet (41) and a cylindrical surface (42) are arranged in the groove to limit the O-ring (3) by the fillet (41) and the cylindrical surface (42).

3. The crankshaft end bearing sealing structure according to claim 1, characterized in that: The outer ring of the ball bearing (2) with a contact seal cover is press-fitted into the crankcase (1), and the inner ring is assembled on the crankshaft (4) by clearance fit.

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