Small gasoline engine flywheel and dismounting tool

Abstract

The flywheel structurally comprises a flywheel disc, a boss is formed at one end of the flywheel disc, and limiting grooves are symmetrically machined in the two parallel side walls of the boss; the disassembling tool comprises a positioning sleeve, the upper portion of the positioning sleeve is closed, a bolt is installed in the center through threads, the lower portion of the positioning sleeve is open, an inner cavity is formed in the center, an elastic limiting mechanism is installed on the wall of the inner cavity in the radial direction, and the end of the elastic limiting mechanism is provided with a limiting block corresponding to the limiting groove. During disassembly, the boss extends into the inner cavity, the limiting block is embedded into the limiting groove in the side face of the boss, after the bolt is rotated, the bolt abuts against the end of the crankshaft, and the flywheel disc is separated from the crankshaft through the jacking force of the bolt. According to the scheme, the limiting grooves are machined in the two sides of the boss of the flywheel disc, the flywheel disc is positioned by being matched with the positioning sleeve with the elastic limiting mechanism, the flywheel disc is separated from the crankshaft through the jacking force of the bolts, disassembly is convenient, additional auxiliary holes do not need to be machined in the flywheel disc, and the flywheel disc is more stable in structure.

Description

Technical Field

[0001] The utility model relates to a small gasoline engine flywheel and a disassembly tool. Background Art

[0002] As a key power output part of the engine, the flywheel has a certain moment of inertia and functions as a kinetic energy storage device, which plays a role in regulating the crankshaft speed and responding to the generator frequency stability in a timely manner. The flywheel is installed on the crankshaft end through a key connection structure. When the crankshaft is overhauled, the flywheel needs to be removed. In order to facilitate the removal of the flywheel, a process hole is generally processed on the flywheel for subsequent positioning and removal tools. However, the opening of the process hole will affect the overall strength of the flywheel, and thus affect the service life of the flywheel. Utility Model Content

[0003] In view of the shortcomings existing in the above problems, the utility model provides a small gasoline engine flywheel and a disassembly tool.

[0004] To achieve the above-mentioned purpose, the utility model provides a small gasoline engine flywheel, including a flywheel disc, a boss is axially extended in the middle of one end of the flywheel disc, a through hole is axially processed through the center of the boss, a keyway is axially processed on the inner wall of the through hole, the cross-section of the boss is a regular hexagon, and limiting grooves are symmetrically processed on two parallel side walls of the boss.

[0005] A disassembly tool for a small gasoline engine flywheel is also provided, comprising a positioning sleeve, the upper portion of which is closed and a threaded bolt is installed at the center, the lower portion of which is open and an inner cavity is formed at the center, the shape of the inner cavity matches the shape of the boss, an elastic limiting mechanism is radially installed on the inner cavity wall, and a limiting block is provided at one end of the elastic limiting mechanism facing the center of the inner cavity, corresponding to the limiting groove;

[0006] During disassembly, the boss extends into the inner cavity, and the limit block is embedded in the limit groove on the side of the boss. After the bolt is rotated, the bolt abuts against the end of the crankshaft, and the flywheel disc is disengaged from the crankshaft by relying on the lifting force of the bolt.

[0007] As a further improvement of the utility model, the elastic limiting mechanism includes the limiting block, connecting rod and positioning head connected in sequence, the inner cavity wall is radially processed with a guide hole, the outer end of the guide hole is installed with a cover, the limiting block is slidably arranged in the guide hole, the positioning head is arranged on the outside of the cover, and the connecting rod is sleeved with a compression spring, and the two ends of the compression spring are respectively abutted against the cover and the limiting block.

[0008] As a further improvement of the present invention, the guide hole is a square hole structure.

[0009] As a further improvement of the present invention, the end of the limit block is processed to form a slope.

[0010] As a further improvement of the utility model, an internal threaded hole is processed at the center of the upper part of the positioning sleeve to match the bolt.

[0011] As a further improvement of the utility model, a cross bar is fixedly provided on the upper end of the bolt.

[0012] As a further improvement of the utility model, a bracket is radially provided on the outer side wall of the positioning sleeve.

[0013] The beneficial effects of the utility model are:

[0014] This solution processes limiting grooves on both sides of the boss of the flywheel disc, and uses a positioning sleeve with an elastic limiting mechanism to position the flywheel disc. After the boss extends into the inner cavity of the positioning sleeve, the limiting block at the end of the elastic limiting mechanism is embedded in the limiting groove on the side of the boss. Finally, the flywheel disc is disengaged from the crankshaft by using the lifting force of the bolt, which makes disassembly easy. In addition, there is no need to process additional process holes on the flywheel disc for positioning during disassembly, and the flywheel disc structure is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a working schematic diagram of disassembling a flywheel of a small gasoline engine according to the utility model;

[0016] Figure 2 is a central sectional view of the flywheel disc 1;

[0017] Figure 3 is a top view of the flywheel disc 1;

[0018] Figure 4 This is a structural schematic diagram of a small gasoline engine flywheel removal tool of the utility model;

[0019] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0020] In the figure: 1. flywheel disc; 11. boss; 12. limit groove; 13. through hole; 14. keyway; 2. positioning sleeve; 21. inner cavity; 22. internal threaded hole; 23. guide hole; 24. cover; 3. bracket; 4. bolt; 41. cross bar; 5. elastic limit mechanism; 51. limit block; 511. inclined surface; 52. connecting rod; 53. compression spring; 54. positioning head; 6. crankshaft. DETAILED DESCRIPTION

[0021] A small gasoline engine flywheel and a disassembly tool described in the embodiment of the utility model are as follows: Figure 2-3As shown, the flywheel structure includes a flywheel disc 1, a boss 11 is axially extended in the middle of one end of the flywheel disc 1, a through hole 13 is axially processed through the center of the boss 11, a key groove 14 is axially processed on the inner wall of the through hole 13, the cross-section of the boss 11 is a regular hexagon, and limiting grooves 12 are symmetrically processed on two parallel side walls of the boss 11.

[0022] like Figure 4-5 As shown, the disassembly tool includes a positioning sleeve 2, a bracket 3 is radially arranged on the outer wall of the positioning sleeve 2, the upper part of the positioning sleeve 2 is closed and a bolt 4 is threadedly installed at the center, a cross bar 41 is fixed to the upper end of the bolt 4, an internal threaded hole 22 is processed at the center of the upper part of the positioning sleeve 2 to match the bolt 4, the lower part of the positioning sleeve 2 is open and an inner cavity 21 is formed at the center, the shape of the inner cavity 21 matches the shape of the boss 11, an elastic limiting mechanism 5 is radially installed on the wall of the inner cavity 21, and a limiting mechanism is arranged at one end of the elastic limiting mechanism 5 facing the center of the inner cavity 21 The block 51 corresponds to the limit groove 12, and the end of the limit block 51 is processed to form an inclined surface 511. The elastic limit mechanism 5 includes a limit block 51, a connecting rod 52, and a positioning head 54 connected in sequence. A guide hole 23 is radially processed on the wall of the inner cavity 21. The guide hole 23 is a square hole structure. The outer end of the guide hole 23 is installed with a cover 24. The limit block 51 is slidably arranged in the guide hole 23, and the positioning head 54 is arranged on the outer side of the cover 24. A compression spring 53 is sleeved on the connecting rod 52, and the two ends of the compression spring 53 are respectively abutted against the cover 24 and the limit block 51;

[0023] During disassembly, the boss 11 extends into the inner cavity 21, and the limit block 51 is embedded in the limit groove 12 on the side of the boss 11. After the bolt 4 is rotated, the bolt 4 abuts against the end of the crankshaft 6, and the flywheel 1 is disengaged from the crankshaft 6 by relying on the lifting force of the bolt 4.

[0024] This solution processes limiting grooves on both sides of the boss of the flywheel disc, and uses a positioning sleeve with an elastic limiting mechanism to position the flywheel disc. After the boss extends into the inner cavity of the positioning sleeve, the limiting block at the end of the elastic limiting mechanism is embedded in the limiting groove on the side of the boss. Finally, the flywheel disc is disengaged from the crankshaft by using the lifting force of the bolt, which makes disassembly easy. In addition, there is no need to process additional process holes on the flywheel disc for positioning during disassembly, and the flywheel disc structure is more stable.

[0025] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0026] This scheme is mainly used to disengage the flywheel disc from the crankshaft. The flywheel disc and the crankshaft are connected by a key to form a tight fit structure. The boss of the flywheel disc is close to the end of the crankshaft. When disassembling, the positioning sleeve is set on the boss of the flywheel disc, and the boss extends into the inner cavity of the positioning sleeve. As the boss extends, the edge of the boss contacts the inclined surface of the limit block, and the limit block is pressed into the guide hole. When the position of the limit block is opposite to the limit groove on the side of the boss, the limit block relies on the elastic memory of the compression spring to embed into the limit groove to form axial limit. It is a regular hexagon, and the boss and the limiting sleeve will not rotate relative to each other, and the positioning between the positioning sleeve and the boss is completed; then, grasp the bracket outside the positioning sleeve, turn the bolt, the end of the bolt extends into the inner cavity and abuts against the end of the crankshaft, and after continuing to turn the bolt, axial movement occurs between the bolt and the positioning sleeve. Relying on the lifting force of the bolt, the positioning sleeve drives the flywheel to disconnect from the crankshaft. After removing the flywheel, just pull the positioning head of the elastic limiting mechanism outward, and the limiting block withdraws from the limiting groove on the side wall of the boss to take out the flywheel.

[0027] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A small gasoline engine flywheel, characterized in that: The flywheel disc (1) comprises a boss (11) extending axially from the middle of one end of the flywheel disc (1), a through hole (13) axially processed through the center of the boss (11), a key groove (14) axially processed on the inner wall of the through hole (13), the boss (11) having a regular hexagonal cross section, and limiting grooves (12) symmetrically processed on two parallel side walls of the boss (11).

2. A disassembly tool suitable for the small gasoline engine flywheel according to claim 1, characterized in that: The invention comprises a positioning sleeve (2), the upper part of the positioning sleeve (2) is closed and a threaded mounting bolt (4) is arranged at the center, the lower part of the positioning sleeve (2) is open and an inner cavity (21) is formed at the center, the shape of the inner cavity (21) matches the outer shape of the boss (11), an elastic limiting mechanism (5) is radially installed on the wall of the inner cavity (21), and a limiting block (51) is arranged at one end of the elastic limiting mechanism (5) facing the center of the inner cavity (21) and corresponding to the limiting groove (12); During disassembly, the boss (11) extends into the inner cavity (21), and the limit block (51) is embedded in the limit groove (12) on the side of the boss (11). After the bolt (4) is rotated, the bolt (4) abuts against the end of the crankshaft (6), and the flywheel (1) is disengaged from the crankshaft (6) by relying on the lifting force of the bolt (4).

3. The disassembly tool according to claim 2, characterized in that: The elastic limiting mechanism (5) comprises a limiting block (51), a connecting rod (52), and a positioning head (54) which are connected in sequence; a guide hole (23) is radially processed on the wall of the inner cavity (21); a cover (24) is installed at the outer end of the guide hole (23); the limiting block (51) is slidably arranged in the guide hole (23); the positioning head (54) is arranged on the outer side of the cover (24); a compression spring (53) is sleeved on the connecting rod (52); and two ends of the compression spring (53) are respectively in contact with the cover (24) and the limiting block (51).

4. The disassembly tool according to claim 3, characterized in that: The guide hole (23) is in a square hole structure.

5. The disassembly tool according to claim 2, characterized in that: The end of the limiting block (51) is processed to form a slope (511).

6. The disassembly tool according to claim 2, characterized in that: An internal threaded hole (22) is processed at the center of the upper portion of the positioning sleeve (2) to match the bolt (4).

7. The disassembly tool according to claim 2, characterized in that: A cross bar (41) is fixedly disposed on the upper end of the bolt (4).

8. The disassembly tool according to claim 2, characterized in that: A bracket (3) is radially arranged on the outer side wall of the positioning sleeve (2).

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