CN-116728082-B - Roller assembly assembling tool

CN116728082BCN 116728082 BCN116728082 BCN 116728082BCN-116728082-B

Abstract

The scheme relates to a roller assembly fixture. When the guide sleeve is used, after the roller is placed at the designated position of the positioning block, the retainer ring is placed in the notch in the roller, the guide sleeve is placed in the notch, the first cylindrical surface of the guide sleeve is centered on the retainer ring, then the inner hole of the bushing is matched with the third cylindrical surface of the guide sleeve, and the gland is covered. The pressing cover is pushed by a pressing machine, at the moment, the retainer ring is propped up by the conical surface of the guide sleeve, the retainer ring is clamped into the inner groove of the roller until the second cylindrical surface of the guide sleeve enters the inner hole of the retainer ring, the retainer ring is not stretched any more, along with the further pushing of the pressing cover, the second cylindrical surface of the guide sleeve can be gradually replaced by the outer circle of the bushing to enter the inner hole of the retainer ring until the annular groove on the outer circle of the bushing is aligned with the retainer ring, the retainer ring is tightly held in the annular groove on the outer circle of the bushing due to elastic contraction, at the moment, the guide sleeve is pushed to a calculated distance, is just contacted with the flat plate, and stops advancing, so that the upper and lower symmetry of the bushing in the roller is ensured, and the sequential assembly of the roller, the retainer ring and the bushing is completed.

Inventors

LI DAYONG
TANG SONG
SONG DAIJIAO
GAN YONG
LI DONGBIN
Jiao Zejun
CHEN MINGJIAN

Assignees

重庆红江机械有限责任公司

Dates

Publication Date: 20260512
Application Date: 20230801

Claims (3)

1. The roller assembly assembling tool is characterized by comprising a gland; The positioning block is internally provided with a through hole, the positioning block is provided with a plane for placing the roller, and the aperture of the through hole of the positioning block is larger than the aperture of the inner hole of the roller; the guide sleeve is provided with a first-stage cylindrical surface, a conical surface, a second cylindrical surface and a third cylindrical surface which are sequentially connected from bottom to top, wherein the third cylindrical surface and the second cylindrical surface form a step; the outer diameter of the conical surface is gradually increased 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 the roller assembly is assembled, the following assembly flow is executed: Placing a roller on the plane of a positioning block, placing a retainer ring part in an inner wall notch of the roller, inserting a guide sleeve into an inner hole of the roller from above the roller, enabling a second cylindrical surface of the guide sleeve to completely squeeze the retainer ring into the inner wall notch of the roller, sleeving a bushing on a third cylindrical surface, covering a gland on the bushing, pushing the gland downwards by using a press machine, pushing the bushing to move downwards along with the guide sleeve by the gland, and enabling a rebound part of the retainer ring to extend into an outer ring groove of the bushing when the outer ring groove of the bushing moves to a position opposite to the retainer ring; the width of the step formed between the second cylindrical surface and the third cylindrical surface of the guide sleeve is the same as the thickness of the bushing.
2. The roller assembly fixture of claim 1, wherein the second cylindrical surface of the guide sleeve forms a clearance fit with the inner bore of the roller.
3. The roller assembly fixture of claim 1, wherein the roller is heated and the bushing is liquid nitrogen cooled prior to placement of the roller on the plane of the locating hole.

Description

Roller assembly assembling tool Technical Field The invention relates to the technical field of assembly of an inner groove lug-free retainer ring of an engine, in particular to an assembly fixture of a roller assembly. Background The role of the roller assembly in diesel engines is particularly important today, where diesel engines are increasingly developed. The most advanced roller assembly at home and abroad adopts the interference assembly of the roller and the bushing by adopting the methods of heating and freezing respectively in the traditional way, and a check ring mounting structure is additionally arranged between the roller and the bushing to further increase the stability of the roller assembly (see figure 1 for details). If the assembly is carried out by a manual method, the normal assembly thought is that 1, the retainer ring is firstly arranged in the groove of the lining, and then the whole retainer ring is cooled and arranged in the roller. But the expanding check ring is easy to hurt hands and scratch the bush, the outer diameter of the expanded check ring is far larger than the aperture of the roller, and the bush and the check ring are difficult to enter the roller through cold filling. The method is that the retainer ring is firstly put into the inner hole groove of the roller, the liner is then cold-fitted into both bores. Because the outer diameter of the cooled bushing is still far greater than the inner diameter of the inner retainer ring of the roller, the assembly cannot be completed. The method comprises the following steps of adopting a guide sleeve to fix a retainer ring in an inner groove of an idler wheel, heating, and finally loading a frozen bushing. The assembly mode needs more guide sleeves, wastes seriously, has low efficiency, and has great influence on the performance and the service life of the check ring by heating. Disclosure of Invention The invention discloses a roller assembly assembling tool, which aims to solve the technical problem of mounting a retainer ring in an inner groove of a roller assembly. The technical scheme of the invention is as follows: the invention provides a roller assembly assembling tool, which comprises a gland; The positioning block is internally provided with a through hole, the positioning block is provided with a plane for placing the roller, and the aperture of the through hole of the positioning block is larger than the aperture of the inner hole of the roller; the guide sleeve is provided with a first-stage cylindrical surface, a conical surface, a second cylindrical surface and a third cylindrical surface which are sequentially connected from bottom to top, wherein the third cylindrical surface and the second cylindrical surface form a step; the outer diameter of the conical surface is gradually increased 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 the roller assembly is assembled, the following assembly flow is executed: The method comprises the steps of placing a roller on the plane of a positioning hole, placing a retainer ring part in an inner wall notch of the roller, inserting a guide sleeve into an inner wall notch of the roller from above the roller, enabling a second-stage cylindrical surface of the guide sleeve to completely squeeze the retainer ring into the inner wall notch of the roller, sleeving a bushing on a third cylindrical surface, covering a gland on the bushing, pushing the gland downwards by using a press machine, pushing the bushing to move downwards along with the guide sleeve by the gland, and enabling a rebound part of the retainer ring to extend into an outer ring groove of the bushing when the outer ring groove of the bushing moves to a position opposite to the retainer ring. Preferably, the width of the step formed between the second cylindrical surface and the third cylindrical surface of the guide bush is the same as the thickness of the bush. Preferably, the second cylindrical surface of the guide sleeve forms a clearance fit with the inner bore of the roller. Preferably, the roller is heated and the bushing is liquid nitrogen cooled prior to placement of the roller in the plane of the locating hole. The invention has the beneficial effects that: The problem of equipment difficulty in the design of novel engine roller assembly is solved, because the retaining ring struts the mode and changes into the even atress of inclined plane by manual, has also stopped the damage to the retaining ring during normal assembly, and can be in symmetrical position in the gyro wheel by the difference in height of uide bushing and locating piece further restriction bush for the stable operation of engine is guaranteed. The guide sleeve, the positioning block and the gland are changed in size, so that the novel tool is applicable to the inner check ring of the roller assembly with all sizes. The tool is simple in