Roller assembly assembly tool

Abstract

The present scheme relates to a kind of roller assembly assembly tooling.When using, after placing the roller in the specified position of positioning block, first, the baffle ring is placed in the inner notch of roller, put into guide sleeve, the first cylindrical surface of guide sleeve is centered to baffle ring, then the inner hole of bushing is matched with the third cylindrical surface of guide sleeve, cover with gland.The gland is pushed by presser, the conical surface of guide sleeve will open baffle ring at this time, baffle ring is clamped into inner notch of roller, until the second cylindrical surface of guide sleeve enters the inner hole of baffle ring, baffle ring is no longer open, with the further pushing of gland, the outer circle of bushing will gradually replace the second cylindrical surface of guide sleeve and enter the inner hole of baffle ring, until the ring groove on the outer circle of bushing is aligned with baffle ring, baffle ring is tightly held in the ring groove of outer circle of bushing due to elastic contraction, at this time, guide sleeve is pushed to calculated distance, and just contact with flat plate, stop advancing, ensure that bushing is symmetrically up and down in roller, i.e.completion roller-baffle ring-bushing sequential assembly.

Description

Technical Field

[0001] This invention relates to the field of engine inner groove earless retaining ring assembly technology, specifically to a roller assembly tooling. Background Technology

[0002] With the rapid development of diesel engines, roller assemblies play a particularly important role. The most advanced roller assemblies, both domestically and internationally, in addition to the traditional method of interference fitting using separate heating and cooling of the rollers and bushings, also incorporate a retaining ring structure between them to further enhance the stability of the roller assembly (see appendix for details). Figure 1 If assembled manually, there are two normal assembly approaches: 1. First, insert the retaining ring into the bushing groove, then cool the entire assembly before inserting it into the roller. However, opening the retaining ring can easily injure hands and scratch the bushing, and the outer diameter of the opened retaining ring is much larger than the roller bore diameter, making it difficult to cold-fit the bushing and retaining ring into the roller. Approach 2. First, insert the retaining ring into the inner groove of the roller, then cold-fit the bushing into both inner holes. Because the outer diameter of the cooled bushing is still much larger than the inner diameter of the retaining ring inside the roller, assembly cannot be completed. Approach 3. Use a guide sleeve to fix the retaining ring in the inner groove of the roller, heat it, and finally insert the frozen bushing. This assembly method requires many guide sleeves, resulting in significant waste and low efficiency. Furthermore, heating has a significant impact on the performance and lifespan of the retaining ring. Summary of the Invention

[0003] This invention provides a roller assembly tooling to solve the technical problem of installing retaining rings in the inner groove of roller assemblies.

[0004] The technical solution of this invention is as follows:

[0005] This invention provides a roller assembly assembly fixture, comprising: a pressure cap;

[0006] A positioning block having a through hole inside, the positioning block having a flat surface for placing a roller, and the diameter of the through hole of the positioning block being larger than the inner diameter of the roller.

[0007] The guide sleeve has a first cylindrical surface, a conical surface, a second cylindrical surface, and a third cylindrical surface that forms a step with the second cylindrical surface, which are connected sequentially from bottom to top on its outer circumference; the step is used to place the bushing.

[0008] The outer diameter of the conical surface gradually increases from bottom to top, and the outer diameter of the third cylindrical surface is smaller than the outer diameter of the second cylindrical surface;

[0009] When assembling the roller assembly, the following assembly process is performed:

[0010] Place the roller on the plane of the positioning hole; place the retaining ring part in the groove of the inner wall of the roller; insert the guide sleeve into the inner hole of the roller from above, so that the second cylindrical surface of the guide sleeve completely squeezes the retaining ring into the groove of the inner wall of the roller; put the bushing on the third cylindrical surface; put the pressure cap on the bushing; use a press to push the pressure cap down, and the pressure cap pushes the bushing down with the guide sleeve. When the outer annular groove of the bushing moves to the position opposite to the retaining ring, the retaining ring springs back and extends into the outer annular groove of the bushing.

[0011] Preferably, the width of the step formed between the second and third cylindrical surfaces of the guide sleeve is the same as the thickness of the bushing.

[0012] Preferably, the second cylindrical surface of the guide sleeve forms a clearance fit with the inner hole of the roller.

[0013] Preferably, the roller is heated and the bushing is cooled with liquid nitrogen before the roller is placed on the plane of the positioning hole.

[0014] The beneficial effects of this invention are:

[0015] This design solves the assembly difficulties encountered in the new engine roller assembly. By changing the retaining ring opening method from manual to a uniformly applied inclined surface, damage to the retaining ring during normal assembly is eliminated. Furthermore, the height difference between the guide sleeve and the locating block further restricts the bushing's symmetrical position within the roller, ensuring stable engine operation. Modifying the dimensions of the guide sleeve, locating block, and pressure cap allows this new tooling to be applied to retaining rings within roller assemblies of all sizes. This tooling design is simple, low-cost, and easy to operate, requiring no advanced operator skills or experience. It offers high assembly efficiency and is suitable for mass production. Attached Figure Description

[0016] Figure 1 Example of a partial assembly drawing of the engine roller assembly;

[0017] Figure 2 This is a schematic diagram of the guide sleeve in this embodiment;

[0018] Figure 3 This is a schematic diagram of tooling assembly in an embodiment of the present invention;

[0019] Reference numerals in the attached drawings: 1-guide sleeve, 2-positioning block, 3-pressure cap; 11-first cylindrical surface; 12-conical surface; 13-second cylindrical surface, 14-third cylindrical surface; 4-roller; 5-retaining ring; 6-shield. Detailed Implementation

[0020] like Figure 3 As shown, this embodiment provides a roller assembly fixture, including:

[0021] Positioning block 2 has a through hole inside, and the positioning block 2 has a flat surface for placing roller 4, and the diameter of the through hole of positioning block 1 is larger than the inner diameter of roller 4;

[0022] The guide sleeve 1 has a first cylindrical surface 11, a conical surface 12, a second cylindrical surface 13, and a third cylindrical surface 14 that forms a step with the second cylindrical surface 13, which are connected sequentially from bottom to top on its outer circle; the step is used to place the bushing.

[0023] The outer diameter of the conical surface 12 gradually increases from bottom to top, and the outer diameter of the third cylindrical surface 14 is smaller than the outer diameter of the second cylindrical surface 13.

[0024] The width of the step formed between the second cylindrical surface 13 and the third cylindrical surface 14 of the guide sleeve 1 is the same as the thickness of the bushing 6.

[0025] The second cylindrical surface 13 of the guide sleeve 1 forms a clearance fit with the inner hole of the roller 3.

[0026] The conical surface 12 of the guide sleeve is designed with an angle of 15°, which allows the retaining ring 5 to gradually increase in size along the conical surface 12 until the second cylindrical surface 13. This avoids the retaining ring 5 from easily breaking due to excessive increase in size, and its structure is relatively reliable.

[0027] The fixture includes a guide sleeve 1 for guiding the retaining ring 5 and the bushing 4, a positioning block 2 for fixing the roller 4, and a pressure cap 3 for pressing. Before use, the bushing 6 is cooled with liquid nitrogen, and the roller 4 is slightly heated. During use, after placing the roller 4 in the designated position of the positioning block 2, the retaining ring 5 is first placed in the groove on the inner wall of the roller 4, and then the guide sleeve 1 is inserted. The second cylindrical surface 13 of the guide sleeve 1 centers the retaining ring 5. Then, the inner hole of the bushing 5 is engaged with the third cylindrical surface 14 of the guide sleeve 1, and the pressure cap 3 is put on, making the three parts a whole. When the press cover 3 is pushed, the conical surface 12 of the guide sleeve 1 opens the retaining ring 5, and the retaining ring 5 is inserted into the inner wall of the roller 4 until the second cylindrical surface 13 of the guide sleeve 1 enters the inner hole of the retaining ring 5. The retaining ring 5 is stopped by the second cylindrical surface 13 of the guide sleeve 1 and no longer opens. As the press cover 3 is pushed further, the outer circle of the bushing 6 will gradually replace the second cylindrical surface 13 of the guide sleeve 1 and enter the inner hole of the retaining ring 5 until the outer annular groove of the bushing 6 is aligned with the retaining ring 5. The retaining ring 5 is held tightly in the outer annular groove of the bushing 6 due to elastic contraction. At this time, the guide sleeve 1 is pushed to the calculated distance and just contacts the plate, and stops moving forward to ensure that the bushing 6 is symmetrical in the roller 4. Thus, the assembly sequence of roller 4-retaining ring 5-bushing 6 is completed.

[0028] This embodiment overcomes the assembly difficulties encountered in the design of novel engine roller assemblies. Because the retaining ring opening method is changed from manual to uniform force distribution on an inclined plane, damage to the retaining ring during normal assembly is eliminated. Furthermore, the height difference between the guide sleeve and the positioning block further restricts the bushing to a symmetrical position within the roller, ensuring stable engine operation. By modifying the dimensions of the guide sleeve, positioning block, and pressure cap, this new tooling can be applied to retaining rings within roller assemblies of all sizes. This tooling design is simple in structure, low in cost, and easy to operate, requiring no high level of skill or experience from the operator. It offers high assembly efficiency and is suitable for mass production.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roller assembly assembly fixture, characterized in that, include: Capping; A positioning block having a through hole inside, the positioning block having a flat surface for placing a roller, and the diameter of the through hole of the positioning block being larger than the inner diameter of the roller. The guide sleeve has a first cylindrical surface, a conical surface, a second cylindrical surface, and a third cylindrical surface that forms a step with the second cylindrical surface, which are connected sequentially from bottom to top on its outer circumference; the step is used to place the bushing. The outer diameter of the conical surface gradually increases from bottom to top, and the outer diameter of the third cylindrical surface is smaller than the outer diameter of the second cylindrical surface; When assembling the roller assembly, the following assembly process is performed: Place the roller on the plane of the positioning block; place the retaining ring part in the inner groove of the roller; insert the guide sleeve into the inner hole of the roller from above, so that the second cylindrical surface of the guide sleeve completely squeezes the retaining ring into the inner groove of the roller; put the bushing on the third cylindrical surface; put the pressure cap on the bushing; use a press to push the pressure cap down, the pressure cap pushes the bushing down with the guide sleeve, and when the outer annular groove of the bushing moves to the position opposite to the retaining ring, the retaining ring springs back and extends into the outer annular groove of the bushing; The width of the step formed between the second and third cylindrical surfaces of the guide sleeve is the same as the thickness of the bushing.

2. The roller assembly assembly fixture according to claim 1, characterized in that, The second cylindrical surface of the guide sleeve forms a clearance fit with the inner hole of the roller.

3. The roller assembly assembly fixture according to claim 1, characterized in that, Before placing the roller on the plane of the positioning hole, the roller is heated and the bushing is cooled with liquid nitrogen.

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