Split assembly type crankshaft assembly tool structure

Abstract

The utility model discloses a split assembly type crankshaft assembly tool structure, which relates to the technical field of crankshaft assembly and comprises a U-shaped tool main body, a second crank pressing block is arranged on the right side of the upper end of the U-shaped tool main body, and a first crank pressing block is arranged on the left side of the upper end of the U-shaped tool main body. Mounting grooves are formed between the first crank pressing block and the U-shaped tool body and between the second crank pressing block and the U-shaped tool body in a penetrating mode, and through the precision of the mounting grooves formed in the U-shaped tool body and the first crank pressing block and the second crank pressing block, main journals at the two ends of the first crank and the two ends of the second crank are limited to be assembled; according to the split assembly type crankshaft, the run-out amount of main journals of the first crank and the second crank after assembly can be effectively controlled, the improved tool and the improved assembly scheme are used, the problem of out-of-tolerance run-out of the split assembly type crankshaft after assembly is effectively solved, the assembly qualification rate reaches 100%, the production efficiency is greatly improved, and the waste loss is also greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft assembly, in particular to a split assembly type crankshaft assembly tooling structure. Background Art

[0002] The crankshaft of the drone is a split assembly structure. Crank 1, crank 2, bearing, gasket, crank pin, and integrated connecting rod need to be assembled. All parts are assembled by freezing the crank pin with liquid nitrogen. After assembly, the crankshaft assembly (such as Figure 1 ), all parts are processed to finished product size before assembly, and the outer circle runout of the main shaft necks at both ends is required to be ≤0.03mm after assembly. The control of the runout is the key difficulty of assembly;

[0003] However, the pressure on the crank during the crank pin assembly process will produce a certain amount of deformation, which will eventually lead to excessive runout of the main journals at both ends. The assembly qualification rate is less than 10%. After the runout exceeds the tolerance, the first crank and the second crank will be scrapped because the crank is deformed and the pin hole is enlarged. Even if they are disassembled and reassembled, the runout and interference fit cannot meet the requirements. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a split-assembly crankshaft assembly tooling structure to solve the problem that the pressure on the crank during the crank pin assembly process will produce a certain amount of deformation, which will eventually lead to excessive runout of the main journals at both ends, and the assembly qualification rate is less than 10%. After the runout exceeds the tolerance, the first crank and the second crank will be scrapped. Due to the deformation of the crank and the expansion of the pin hole, even if it is disassembled and reassembled, the runout and interference fit cannot meet the required technical problems.

[0006] (II) Technical solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A split-assembly crankshaft assembly tooling structure comprises a U-shaped tooling body, a second crank pressure block is provided on the right side of the upper end of the U-shaped tooling body, a first crank pressure block is provided on the left side of the upper end of the U-shaped tooling body, installation grooves are provided between the first crank pressure block and the second crank pressure block and the U-shaped tooling body, clamping bolts are threadedly installed between the first crank pressure block and the second crank pressure block and the U-shaped tooling body, a first crank is provided in the installation groove provided between the U-shaped tooling body and the first crank pressure block, and a bearing is provided on the right side of the first crank.

[0009] Preferably: a connecting rod is provided on the bearing, and a second crank is provided on the right side of the bearing.

[0010] Preferably: gaskets are provided between the first crank and the bearing and the second crank, process pins are provided through the first crank and the bearing and the second crank, and the right end of the second crank is provided in a mounting groove provided between the second crank block and the U-shaped tooling body.

[0011] (III) Beneficial effects

[0012] The invention limits the accuracy of the installation grooves opened by the U-shaped tooling body of the device and the first crank block and the second crank block, and assembles them after limiting the main shaft necks at both ends of the first crank and the second crank, which can effectively control the amount of main shaft neck runout of the first crank and the second crank after assembly. The use of the improved tooling and assembly scheme effectively solves the problem of excessive runout of the split-assembly crankshaft after assembly, and the assembly qualification rate reaches 100%, the production efficiency is greatly improved, and the waste loss is also greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0014] Figure 1 This is a structural diagram of the first crank block of the utility model;

[0015] Figure 2 This is a structural diagram of the U-shaped tooling body of the utility model;

[0016] Figure 3 This is a structural diagram of the first crank of the utility model;

[0017] Figure 4 This is a structural diagram of the gasket of the utility model;

[0018] Figure 5 This is a structural diagram of the second crank of the utility model;

[0019] Figure 6 It is a structural diagram of the crank pin of the utility model.

[0020] Legend: 11. U-shaped tooling body; 12. First crank block; 13. Clamping bolt; 14. Process pin; 15. Second crank block; 16. Crank pin; 21. First crank; 22. Gasket; 23. Bearing; 24. Connecting rod; 25. Second crank. DETAILED DESCRIPTION

[0021] The embodiment of the present application provides a split-assembly type crankshaft assembly tooling structure, which effectively solves the problem of pressure on the crank during crank pin assembly, which will produce a certain amount of deformation, and eventually cause the main journals at both ends to run out of tolerance, and the qualified assembly rate is less than 10%. After the runout exceeds the tolerance, the first crank and the second crank will be scrapped. Due to the deformation of the crank and the expansion of the pin hole, even if they are disassembled and reassembled, the runout and interference fit cannot meet the requirements. The new type of device limits the accuracy of the installation grooves opened by the U-shaped tooling body of the device and the first crank block and the second crank block, and then assembles them, which can effectively control the runout of the main journals of the first crank and the second crank after assembly. The use of the improved tooling and assembly scheme effectively solves the problem of runout exceeding the tolerance after assembly of the split-assembly type crankshaft, and the qualified assembly rate reaches 100%, the production efficiency is greatly improved, and the scrap loss is also greatly reduced.

[0022] Example

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the technical solution in the embodiment of the present application is to effectively solve the technical problem that the pressure on the crank during the crank pin assembly process will produce a certain amount of deformation, which will eventually lead to excessive runout of the main journals at both ends, and the assembly qualification rate is less than 10%. After the runout exceeds the tolerance, the first crank and the second crank will be scrapped. Due to the deformation of the crank and the expansion of the pin hole, even if it is disassembled and reassembled, the runout and interference can no longer meet the requirements. The overall idea is as follows:

[0024] In view of the problems existing in the prior art, the utility model provides a split-assembly crankshaft assembly tooling structure, including a U-shaped tooling body 11, a second crank pressure block 15 is provided on the right side of the upper end of the U-shaped tooling body 11, and a first crank pressure block 12 is provided on the left side of the upper end of the U-shaped tooling body 11. The main journal of the first crank 21 is placed in an installation groove opened between the U-shaped tooling body 11 and the first crank pressure block 12, and the first crank pressure block 12 is tightened by the tightening bolt 13 to fix the first crank 21.

[0025] A mounting groove is provided between the first crank block 12, the second crank block 15 and the U-shaped tooling body 11, and a clamping bolt 13 is threadedly installed between the first crank block 12, the second crank block 15 and the U-shaped tooling body 11. A first crank 21 is provided in the mounting groove provided between the U-shaped tooling body 11 and the first crank block 12, and a bearing 23 is provided on the right side of the first crank 21. A first gasket 22, a bearing 23, a connecting rod 24 and a second gasket 22 are placed in sequence.

[0026] A connecting rod 24 is provided on the bearing 23, a second crank 25 is provided on the right side of the bearing 23, gaskets 22 are provided between the first crank 21 and the bearing 23 as well as the second crank 25, a process pin 14 is provided through the first crank 21 and the bearing 23 as well as the second crank 25, and the process pin 14 is placed on the first crank 21. The diameter of the process pin 14 is slightly smaller than the size of the pin hole, and the clearance fit mainly serves as a guide for the later assembly of the crank pin 16.

[0027] The right side end of the second crank 25 is arranged in the installation groove opened between the second crank block 15 and the U-shaped tooling body 11, and the main shaft neck of the second crank 25 is placed in the installation groove opened between the U-shaped tooling body 11 and the second crank block 15. The process pin 14 is inserted into the pin hole of the second crank 25, and the gap of the connecting rod 24 is adjusted at the same time. The size is controlled between 0.1 and 0.2 mm to ensure that the connecting rod 24 can rotate freely, and then the second crank block 15 is tightened by the tightening bolt 13 to fix the second crank 25.

[0028] The invention limits the precision of the installation grooves opened by the U-shaped tooling body 11 of the device and the first crank block 12 and the second crank block 15, and assembles after limiting the main journals at both ends of the first crank 21 and the second crank 25, which can effectively control the main journal runout of the first crank 21 and the second crank 25 after assembly. The use of the improved tooling and assembly scheme effectively solves the problem of excessive runout after assembly of the split assembled crankshaft, and the qualified assembly rate reaches 100%, the production efficiency is greatly improved, and the waste loss is also greatly reduced.

[0029] Working principle:

[0030] The first step, such as Figure 3 , place the main journal of the first crank 21 in the installation groove opened between the U-shaped tooling body 11 and the first crank pressing block 12, and tighten the first crank pressing block 12 by the tightening bolt 13 to fix the first crank 21.

[0031] The second step is, Figure 4 A process pin 14 is placed on the first crank 21 . The diameter of the process pin 14 is slightly smaller than the pin hole size, and the clearance fit mainly serves as a guide for the later assembly of the crank pin 16 .

[0032] The third step is Figure 4 and Figure 5 , place the first gasket 22, the bearing 23, the connecting rod 24 and the second gasket 22 in sequence.

[0033] The fourth step is Figure 5, place the main journal of the second crank 25 in the installation groove opened between the U-shaped tooling body 11 and the second crank block 15, insert the process pin 14 into the pin hole of the second crank 25, and adjust the gap of the connecting rod 24 at the same time, control the size between 0.1 and 0.2 mm to ensure that the connecting rod 24 can rotate freely, and then tighten the second crank block 15 with the tightening bolt 13 to fix the second crank 25.

[0034] Step 5: Figure 6 , assemble the crank pin 16. The device is placed vertically, and the crank pin 16 frozen by liquid nitrogen is pressed into the pin hole by a press machine, and the process pin 14 is withdrawn to complete the assembly.

[0035] The invention limits the precision of the installation grooves opened by the U-shaped tooling body 11 of the device and the first crank block 12 and the second crank block 15, and assembles after limiting the main journals at both ends of the first crank 21 and the second crank 25, which can effectively control the main journal runout of the first crank 21 and the second crank 25 after assembly. The use of the improved tooling and assembly scheme effectively solves the problem of excessive runout after assembly of the split assembled crankshaft, and the qualified assembly rate reaches 100%, the production efficiency is greatly improved, and the waste loss is also greatly reduced.

[0036] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A split assembly type crankshaft assembly tool structure, comprising a U-shaped tool body (11), characterized in that: A second crank pressing block (15) is provided on the right side of the upper end of the U-shaped tool body (11), and a first crank pressing block (12) is provided on the left side of the upper end of the U-shaped tool body (11); Wherein, a mounting groove is provided between the first crank pressing block (12) and the second crank pressing block (15) and the U-shaped tooling body (11), and a clamping bolt (13) is installed between the first crank pressing block (12) and the second crank pressing block (15) and the U-shaped tooling body (11) through a thread; Wherein, a first crank (21) is arranged in the installation groove formed between the U-shaped tooling body (11) and the first crank pressing block (12), and a bearing (23) is arranged on the right side of the first crank (21).

2. The split assembly type crankshaft assembly tooling structure according to claim 1 is characterized in that: A connecting rod (24) is provided on the bearing (23).

3. The split assembly type crankshaft assembly tooling structure according to claim 2 is characterized in that: A second crank (25) is provided on the right side of the bearing (23).

4. The split assembly type crankshaft assembly tooling structure according to claim 3 is characterized in that: A gasket (22) is provided between the first crank (21) and the bearing (23) and between the second crank (25).

5. The split assembly type crankshaft assembly tooling structure according to claim 4 is characterized in that: A process pin (14) is provided between the first crank (21) and the bearing (23) and the second crank (25).

6. The split assembly type crankshaft assembly tooling structure according to claim 5 is characterized in that: The right side end of the second crank (25) is arranged in a mounting groove provided between the second crank pressing block (15) and the U-shaped tooling body (11).

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