Mounting tool for crankshaft assembly of piston type two-stroke heavy oil entrained-gas direct injection engine

Abstract

The utility model discloses an installation tool for a crankshaft assembly of a piston type two-stroke heavy oil entrained-gas direct injection engine. The installation tool comprises a free end sleeve, a positioning sleeve, a bearing pressing block, a supporting block, a crankcase cushion block and an output end sleeve. The device is characterized in that after the positioning sleeve and the bearing pressing block are combined, interference assembly of the free-end bearing and the crankcase 2 is achieved by means of a hydraulic machine; after the bearing pressing block and the crankcase cushion block are combined, interference assembly of the output end bearing and the crankcase 1 is achieved through a hydraulic machine. After the free end sleeve, the positioning sleeve, the supporting block, the crankcase cushion block and the output end sleeve are combined, interference assembly of a free end journal and a free end bearing of the crankshaft assembly is achieved through a hydraulic machine. After the free end sleeve, the supporting block and the output end sleeve are combined, interference assembly of an output end journal and an output end bearing of the crankshaft assembly is achieved through a hydraulic machine. The mounting tool has the advantages of simple structure, convenience in operation, low manufacturing cost and the like.

Description

Technical Field

[0001] This utility model belongs to the field of assembly technology of piston-type two-stroke heavy oil direct injection engine, specifically referring to an installation tool for crankshaft assembly of piston-type two-stroke heavy oil direct injection engine. Background Technology

[0002] Piston-type two-stroke heavy oil direct injection engines are an important power type for unmanned aerial vehicle (UAV) systems. As a crucial component for engine power output, the crankshaft assembly employs a slight interference fit in the following ways: crankshaft free end journal and free end bearing, crankshaft output end journal and output end bearing, free end bearing and crankcase 2, and output end bearing and crankcase 1. During engine prototyping, to reduce costs, the crankshaft free end journal and free end bearing, crankshaft output end journal and output end bearing, free end bearing and crankcase 2, and output end bearing and crankcase 1 are assembled using press fitting to achieve an interference fit. To ensure assembly quality, necessary specialized tools are required for press fitting. Summary of the Invention

[0003] The purpose of this invention is to provide a crankshaft assembly installation tool for a piston-type two-stroke heavy oil direct injection engine that is simple in structure, easy to operate, and low in manufacturing cost, so as to ensure the assembly quality of the crankshaft assembly and avoid damage to the crankshaft assembly, free end bearing, output end bearing, crankcase 1, and crankcase 2 during the assembly process.

[0004] The crankshaft assembly installation tool for the piston-type two-stroke heavy oil direct injection engine mainly includes a free end sleeve, a positioning sleeve, a bearing pressure block, a support block, a crankcase gasket, and an output end sleeve. The positioning sleeve and bearing pressure block, when combined, can achieve an interference fit between the free end bearing and crankcase 2 using a hydraulic press. The bearing pressure block and crankcase gasket, when combined, can achieve an interference fit between the output end bearing and crankcase 1 using a hydraulic press. The free end sleeve, positioning sleeve, support block, crankcase gasket, and output end sleeve, when combined, can achieve an interference fit between the free end journal of the crankshaft assembly and the free end bearing using a hydraulic press. The free end sleeve, support block, and output end sleeve, when combined, can achieve an interference fit between the output end journal of the crankshaft assembly and the output end bearing using a hydraulic press.

[0005] Preferably, the crankshaft assembly installation tool for the piston-type two-stroke heavy oil direct injection engine is characterized in that the outer diameter of the free end sleeve and the inner diameter of the positioning sleeve form a small clearance fit, which can accurately position the inner ring of the free end bearing and effectively prevent misalignment of the inner and outer rings of the free end bearing during press-fitting of the crankshaft assembly, thus preventing damage.

[0006] Preferably, the support block is characterized by a C-shaped design and a width slightly smaller than the gap between the two cranks of the crankshaft assembly, which ensures that the crankshaft assembly does not undergo plastic deformation during press-fitting and allows the support block to be easily removed after the crankshaft assembly is installed.

[0007] Preferably, the free end sleeve, positioning sleeve, bearing pressure block, support block, crankcase pad block, and output end sleeve are made of stainless steel to meet the strength requirements of the assembly tools during crankshaft assembly. Beneficial effects

[0008] The present invention has a reasonable structural design, simple structure, and convenient operation. Its beneficial effect is that it can achieve interference fit between the output end bearing and crankcase 1, the free end bearing and crankcase 2, the free end journal of the crankshaft assembly and the free end bearing, and the output end journal of the crankshaft assembly and the output end bearing through different combinations; effectively avoiding damage to the crankshaft assembly, free end bearing, output end bearing, crankcase 1, and crankcase 2 during the crankshaft assembly process. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the components of this utility model;

[0010] Figure 2 This is a schematic diagram of the assembly of the output bearing and crankcase 1;

[0011] Figure 3 This is a schematic diagram of the assembly of the free end bearing and crankcase 2;

[0012] Figure 4 This is a schematic diagram of the assembly of the free end journal and the free end bearing of the crankshaft assembly.

[0013] Figure 5 This is a schematic diagram of the crankshaft assembly, showing the connection between the output journal and the output bearing.

[0014] In the picture:

[0015] 1—Free end sleeve; 2—Positioning sleeve; 3—Elastic retaining ring

[0016] 4—Crankcase 2 5—Free end bearing 6—Bearing clamping block

[0017] 7—Crankshaft assembly; 8—Support block; 9—Output end bearing

[0018] 10—Crankcase 1 11—Crankcase spacer 12—Output end sleeve Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] The basic idea of ​​this invention is to combine a piston-type two-stroke heavy oil direct injection engine crankshaft assembly installation tool to achieve interference fit between the free end journal of the crankshaft assembly (7) and the free end bearing (5), the output end journal of the crankshaft assembly (7) and the output end bearing (9), the free end bearing (5) and the crankcase 2 (4), and the output end bearing (9) and the crankcase 1 (10).

[0021] like Figure 1 As shown, a crankshaft assembly installation tool for a piston-type two-stroke heavy oil direct injection engine mainly includes a free end sleeve (1), a positioning sleeve (2), a bearing pressure block (6), a support block (8), a crankcase pad block (11), and an output end sleeve (12).

[0022] Working principle:

[0023] like Figure 2 As shown, the output bearing (9) is interference-fitted with the crankcase 1 (10); the crankcase 1 (10) is placed stably on the crankcase pad (11), the small end face of the crankcase pad (11) is in contact with the bearing limit of the crankcase 1 (10), the outer ring of the output bearing (9) is in contact with the bearing mounting hole of the crankcase 1 (10) and is placed stably, the large end face of the bearing pressure block (6) is in contact with the end face of the output bearing (9) and is placed stably, and the hydraulic press is used for pressing. When the hydraulic press head can no longer go down, the interference fit between the output bearing (9) and the crankcase 1 (10) is completed.

[0024] like Figure 3 As shown, the free end bearing (5) is interference-fitted with the crankcase 2 (4); the crankcase 2 (4) is placed stably on the positioning sleeve (2), the small end face of the positioning sleeve (2) contacts the end face of the bearing mounting hole of the crankcase 2 (4), the outer ring of the free end bearing (5) contacts the bearing mounting hole of the crankcase 2 (4) and is placed stably, the large end face of the bearing pressure block (6) contacts the end face of the free end bearing (5) and is placed stably, and the hydraulic press is used for pressing. When the hydraulic press head can no longer go down, the interference fit between the free end bearing (5) and the crankcase 2 (4) is completed; after the free end bearing (5) is installed, the elastic retaining ring (3) is installed to limit the free end bearing (5).

[0025] like Figure 4As shown, the crankshaft assembly (7) has an interference fit between the free end journal and the free end bearing (5); the small end face of the crankcase pad (11) contacts the end face of the clearance hole of the free end sleeve (1) and is placed vertically and stably; the output end journal of the crankshaft assembly (7) passes through the crankcase pad (11) and the clearance hole of the free end sleeve (1) and is placed stably on the large end face of the crankcase pad (11); the support block (8) is installed between the two cranks of the crankshaft assembly (7); the bearing hole of the free end bearing (5) on the crankcase 2 (4) is connected to the output end journal of the crankshaft assembly (7). Contact and place stably; the small end face of the positioning sleeve (2) contacts the bearing hole end face of the crankcase 2 (4), the small journal of the positioning sleeve (2) and the inner circle of the free end of the crankcase 2 (4) are fitted to ensure that the axis of the positioning sleeve (2) is coaxial with the axis of the bearing mounting hole of the crankcase 2 (4), the free end sleeve (1) passes through the clearance hole of the positioning sleeve (2) and contacts the inner ring end face of the free end bearing and is placed stably. Use a hydraulic press for pressing. When the hydraulic press head can no longer go down, the crankshaft assembly (7) free end journal and free end bearing (5) interference fit is completed.

[0026] like Figure 5 As shown, the crankshaft assembly (7) output end journal and output end bearing (9) are interference-fitted; the output end inner ring end face of the output end bearing (9) on crankcase 1 (10) contacts the clearance hole end face of the output end sleeve (12) and is placed stably; the crankshaft assembly (7) output end journal and output end bearing (9) on crankcase 2 (4) contact the inner ring of the output end bearing (9) and are placed stably; the support block (8) is installed between the two cranks of the crankshaft assembly (7); the free end sleeve (1) is fitted on the free end journal of the crankshaft assembly (7) and the clearance hole end face contacts the inner ring end face of the free end bearing (5); the hydraulic press is used for pressing. When the hydraulic press head can no longer go down, the interference fit between the crankshaft assembly (7) output end journal and output end bearing (9) is completed. The support block (8) is rotated from the crankcase cylinder block mounting surface and removed.

[0027] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A crankshaft assembly installation tool for a piston-type two-stroke heavy oil direct injection engine, characterized in that... Its main components are a free end sleeve (1), a positioning sleeve (2), a bearing pressure block (6), a support block (8), a crankcase pad (11), and an output end sleeve (12). The positioning sleeve (2) and the bearing pressure block (6) can be combined with a hydraulic press to achieve an interference fit between the free end bearing (5) and the crankcase 2 (4). The bearing pressure block (6) and the crankcase pad (11) can be combined with a hydraulic press to achieve an interference fit between the output end bearing (9) and the crankcase 1 (10). The interference fit of the free end sleeve (1), positioning sleeve (2), support block (8), crankcase pad (11), and output end sleeve (12) can be combined with a hydraulic press to achieve the interference fit between the free end journal of the crankshaft assembly (7) and the free end bearing (5); the interference fit of the free end sleeve (1), support block (8), and output end sleeve (12) can be combined with a hydraulic press to achieve the interference fit between the output end journal of the crankshaft assembly (7) and the output end bearing (9).

2. A piston two-stroke heavy oil-miscible gaseous fuel direct injection engine crank assembly installation tool according to claim 1, characterized in that The free end sleeve (1), positioning sleeve (2), bearing pressure block (6), support block (8), crankcase pad (11), and output end sleeve (12) are made of stainless steel to meet the strength requirements of the assembly tools during the assembly of the crankshaft assembly (7).

3. A piston two-stroke heavy oil air entrained direct injection engine crankshaft assembly installation tool according to claim 1, characterized in that The outer diameter of the free end sleeve (1) and the inner diameter of the positioning sleeve (2) form a small clearance fit, which can accurately position the inner ring of the free end bearing (5) and effectively prevent the inner and outer rings of the free end bearing (5) from being misaligned and damaged during the press-fitting of the crankshaft assembly (7).

4. A piston two-stroke heavy oil-miscible gaseous fuel direct injection engine crank assembly installation tool according to claim 1, characterized in that The support block (8) adopts a C-shaped design and a width slightly smaller than the gap between the two cranks of the crankshaft assembly (7). This ensures that the crankshaft assembly (7) does not undergo plastic deformation during press-fitting and that the support block (8) can be easily removed after the crankshaft assembly (7) is installed.

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