Intermediate shaft dismounting tool for main speed reducer of automobile drive axle

Abstract

An intermediate shaft dismounting tool for an automobile drive axle main speed reducer is composed of a workbench, a positioning assembly and a jacking assembly. According to the positioning assembly, a first positioning sleeve is in clearance fit with a flange plate shaft hole through a positioning flange to achieve radial positioning, and a main reducer shell bearing face is formed at the top end of a second positioning sleeve. The jacking assembly adopts the linkage design of a stepped guide sleeve and a stepped jacking shaft, the large section of the outer diameter of the guide sleeve forms a limiting step surface, and the small-diameter section of the guide sleeve extends into an intermediate shaft mounting hole; the large-diameter section of the jacking shaft is in sliding fit with the guide sleeve, and the small-diameter section of the jacking shaft penetrates through the inner ring of the bearing to precisely apply pressure and forms axial constraint with the tapered roller bearing through a step surface. According to the tool, through the synergistic effect of the three-dimensional positioning reference and the guide jacking mechanism, synchronous extrusion of the intermediate shaft and the interference fit assembly is achieved, deflection damage to parts in the disassembly process is effectively prevented, the disassembly efficiency is improved, and the tool is particularly suitable for maintenance operation of a parallel shaft type main speed reducer.

Description

TECHNICAL FIELD

[0001] The utility model relates to automobile drive axle main speed reducer dismantling technical field, concretely relates to a kind of intermediate shaft dismantling tool of automobile drive axle main speed reducer. BACKGROUND

[0002] CN111828583A discloses a kind of automobile drive axle main speed reducer, as Figure 7 As shown, the structure design of parallel arrangement of input shaft and intermediate shaft, intermediate shaft is located between input shaft and differential assembly.The both ends of the intermediate shaft are supported in the intermediate shaft hole opened inside the reducer housing by two first tapered roller bearings, wherein the I driven gear is assembled on the intermediate shaft in a clearance fit, and the II active gear is fixed by interference fit.

[0003] To reduce production cost, the special dismounting structure of tapered roller bearing is not designed at both ends of the intermediate shaft. In the after-sales maintenance process, when the damaged I driven gear, II active gear or intermediate shaft assembly needs to be replaced, the intermediate shaft needs to be pulled out together with the II active gear and the first tapered roller bearing on one side. However, due to the difference between the shell structure and internal layout of the main reducer and the conventional design, and the interference fit between the intermediate shaft bearings and the shell shaft hole, there is a lack of special positioning device and pressing mechanism, which causes safety hazards and low efficiency in dismounting operation. SUMMARY

[0004] The utility model aims at corresponding insufficient of prior art, provide a kind of intermediate shaft dismantling tool of automobile drive axle main speed reducer, the tool includes positioning assembly and pressing assembly;The positioning assembly is positioned accurately to main speed reducer shell by the clearance fit of first positioning sleeve and flange plate shaft hole, the bearing reference surface formed by the top surface of second positioning sleeve;The pressure assembly includes guide sleeve for guiding, the pressing shaft for pressing out intermediate shaft, the pressing shaft is pressed down by hydraulic machine, realizes the integral pressing out of intermediate shaft and interference fit component, and significantly improves the dismounting efficiency of intermediate shaft.

[0005] The utility model is realized by the following scheme:

[0006] A kind of intermediate shaft dismantling tool of automobile drive axle main speed reducer, including

[0007] Positioning assembly, including bottom plate, first positioning sleeve and second positioning sleeve vertically fixed on bottom plate, the first positioning sleeve upper end clearance fit is at the lower end opening of input shaft mounting hole, the upper end face of the second positioning sleeve is the bearing surface of main speed reducer shell, the axial projection of intermediate shaft mounting hole is in the inner hole of second positioning sleeve, the first positioning sleeve and second positioning sleeve horizontally position main speed reducer shell;

[0008] The top pressing assembly comprises a guide sleeve and a top pressing shaft, the guide sleeve is positioned at the upper end opening of the intermediate shaft mounting hole and guides the top pressing shaft, the top pressing shaft is a stepped shaft, a large diameter section of the top pressing shaft is used for being slidably fitted in the inner hole of the guide sleeve, a small diameter section of the top pressing shaft downwardly extending is used for extending into the inner hole of the tapered roller bearing to apply downward pressing force to the intermediate shaft, and the step of the top pressing shaft cooperates with the upper end surface of the tapered roller bearing to limit the axial movement of the top pressing shaft.

[0009] Preferably, the outer wall of the guide sleeve is stepped, a step surface of the guide sleeve abuts against the upper end surface of the main reducer shell, and a small section of the outer diameter of the guide sleeve downwardly extending extends into the intermediate shaft mounting hole to position the guide sleeve at the upper end opening of the intermediate shaft mounting hole.

[0010] Preferably, the first positioning sleeve and / or the second positioning sleeve are provided with downwardly extending positioning pins at the bottom, the positioning pins are in interference fit in the mounting holes provided in the bottom plate, and the first positioning sleeve and the second positioning sleeve are vertically fixed on the bottom plate.

[0011] Preferably, the first positioning sleeve and / or the second positioning sleeve are provided with radially extending mounting flanges at the bottom, and the fastening bolts pass through the mounting flanges to vertically fix the first positioning sleeve and the second positioning sleeve on the bottom plate.

[0012] Preferably, the first positioning sleeve is provided with a positioning flange at the upper end, and the positioning flange is in clearance fit in the flange shaft hole at the lower end opening of the input shaft mounting hole.

[0013] Preferably, the axial center distance between the first positioning sleeve and the second positioning sleeve is equal to the axial center distance between the input shaft and the intermediate shaft of the main reducer shell.

[0014] Preferably, the second positioning sleeve is provided with an open slot on the side facing the first positioning sleeve.

[0015] Preferably, the first positioning sleeve and the second positioning sleeve have the same axial height.

[0016] Preferably, the axial length of the small diameter section of the top pressing shaft is smaller than the axial height of the second positioning sleeve.

[0017] Preferably, the top pressing shaft is provided with an upwardly open assembly hole, and the assembly hole is used for cooperating with the downward pressing rod of the hydraulic machine.

[0018] The beneficial effects of the utility model are as follows:

[0019] The three-dimensional space accurate positioning is realized through the gap cooperation of the first positioning sleeve and the flange plate shaft hole and the bearing reference surface formed by the top surface of the second positioning sleeve, the main reducer shell is kept stable during the dismounting process, and shaking or tilting is prevented. The guide sleeve is arranged at the upper end opening of the intermediate shaft mounting hole, the intermediate shaft is guided and pressed, the intermediate shaft is accurately pressed by the pressing shaft, and damage to the intermediate shaft and the bearing is avoided. In a word, the safety and reliability of the intermediate shaft dismounting are remarkably improved, damage to the main reducer shell and the intermediate shaft during the dismounting process is reduced, after-sales cost is reduced, and the service life of the parts is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an assembly structure schematic view of the utility model;

[0021] Figure 2 It is a structure schematic view of the pressing assembly in the utility model;

[0022] Figure 3 It is a structure schematic view of the first positioning sleeve in the utility model;

[0023] Figure 4 It is another structure schematic view of the first positioning sleeve in the utility model;

[0024] Figure 5 It is a structure schematic view of the second positioning sleeve in the utility model;

[0025] Figure 6 It is a structure schematic view of the bottom plate in the utility model;

[0026] Figure 7 It is a structure schematic view of the automobile drive axle main reducer in the utility model. DETAILED DESCRIPTION

[0027] As Figures 1 to 7 shown in the figure, an intermediate shaft dismounting tool of an automobile drive axle main reducer, comprising

[0028] A positioning assembly, comprising a bottom plate 1, a first positioning sleeve 2 and a second positioning sleeve 3 vertically fixed on the bottom plate 1, in the embodiment, the first positioning sleeve 2 and / or the second positioning sleeve 3 are provided with downward extending positioning pins 14 at the bottom, the positioning pins 14 are all in interference fit in the mounting holes 15 in the bottom plate 1, so as to vertically fix the first positioning sleeve 2 and the second positioning sleeve 3 on the bottom plate 1, in another embodiment, the first positioning sleeve 2 and / or the second positioning sleeve 3 are provided with radially extending mounting flanges 16 at the bottom, the fastening bolts pass through the mounting flanges 16 to vertically fix the first positioning sleeve 2 and the second positioning sleeve 3 on the bottom plate 1;

[0029] The upper end of the first positioning sleeve 2 is gap-fitted at the lower end opening of the input shaft mounting hole 4, the upper end of the first positioning sleeve 2 is provided with a positioning flange 17, the positioning flange 17 is gap-fitted in the shaft hole of a flange plate 18 at the lower end opening of the input shaft mounting hole 4, the flange plate 18 is used for mounting a motor flange 110, the first positioning sleeve 2 radially positions the main reducer shell 5, the upper end surface of the second positioning sleeve 3 is a bearing surface of the main reducer shell 5, the lower end surface of the main reducer shell 5 abuts against the upper end surface of the second positioning sleeve 3, the axial projection of the intermediate shaft 6 mounting hole is located in the inner hole of the second positioning sleeve 3, so that the components exiting the intermediate shaft 6 mounting hole fall into the inner hole of the second positioning sleeve 3, the first positioning sleeve 2 and the second positioning sleeve 3 horizontally position and support the main reducer shell 5; in the embodiment, the axial distance between the first positioning sleeve 2 and the second positioning sleeve 3 is equal to the axial distance between the input shaft 4 and the intermediate shaft 6 of the main reducer shell 5, in actual production, only the first positioning sleeve 2 needs to position the input shaft 4, the upper end surface of the second positioning sleeve 3 needs to bear the main reducer shell 5, and the components exiting the intermediate shaft 6 mounting hole can fall into the inner hole of the second positioning sleeve 3; the second positioning sleeve 3 is provided with an open slot 19 towards the first positioning sleeve 2, the open slot 19 is used for facilitating the components exiting the intermediate shaft 6 mounting hole to be quickly taken out, and when the size of the second positioning sleeve 3 is too large, the open slot 19 can play a yielding role, preventing the first positioning sleeve 2 and the second positioning sleeve 3 from interfering with each other; in the embodiment, the first positioning sleeve 2 and the second positioning sleeve 3 have the same axial height, in actual production, only the main reducer shell 5 needs to be horizontally positioned and supported;

[0030] The top pressing assembly comprises a guide sleeve 7 and a top pressing shaft 8, the guide sleeve 7 is positioned at the upper end opening of the intermediate shaft 6 mounting hole, the outer wall of the guide sleeve 7 is in a stepped shape, the diameter of the large-diameter section of the guide sleeve 7 is greater than the hole diameter of the intermediate shaft 6 mounting hole, the stepped surface 12 of the guide sleeve 7 abuts against the upper end surface of the main reducer shell 5, and the small-diameter section 13 extending downward of the guide sleeve 7 extends into the intermediate shaft 6 mounting hole, so that the guide sleeve 7 is positioned at the upper end opening of the intermediate shaft 6 mounting hole, the guide sleeve 7 is used for guiding the top pressing shaft 8, the top pressing shaft 8 is a stepped shaft, the large-diameter section 9 of the top pressing shaft 8 is used for being slidingly fitted in the inner hole of the guide sleeve 7, the small-diameter section 10 extending downward of the top pressing shaft 8 is used for extending into the inner hole of the tapered roller bearing 11 to apply a downward pressing force to the intermediate shaft 6, so that the intermediate shaft 6 is pressed downward; the axial length of the small-diameter section 10 of the top pressing shaft 8 is less than the axial height of the second positioning sleeve 3, the stepped surface of the top pressing shaft 8 cooperates with the upper end surface of the tapered roller bearing 11 to limit the axial movement of the top pressing shaft 8, so that the top pressing shaft 8 does not excessively press the intermediate shaft 6, so that the intermediate shaft 6 is damaged due to being pressed at both ends, the top pressing shaft 8 is provided with an upwardly-open assembly hole 21, and the assembly hole 21 is threadedly connected with a pressing rod of a hydraulic machine;

[0031] Usage: first position the main reducer shell 5 on the first positioning sleeve 2, rotate the main reducer shell 5 circumferentially, make the main reducer support on the supporting surface of the end of the second positioning sleeve 3, and make the main reducer shell 5 horizontally positioned, the projection of the middle shaft 6 installation hole of the main reducer shell 5 falls into the inner hole of the second positioning sleeve 3, the components exiting from the middle shaft 6 installation hole can fall into the inner hole of the second positioning sleeve 3, position the guide sleeve 7 at the upper end opening of the middle shaft 6 installation hole, start the hydraulic machine, make the lower pressing plate of the hydraulic machine push the pressing shaft 8 sleeved in the guide sleeve 7, the small diameter section 10 of the pressing shaft 8 extending downward pushes the middle shaft 6 to exit from the middle shaft 6 installation hole, or the lower pressing rod of the hydraulic machine is screwed in the assembly hole 21 of the pressing shaft 8, and the lower pressing pushes the middle shaft 6 to exit from the middle shaft 6 installation hole.

[0032] The preferred embodiments of the present application are described above, and are not intended to limit the present application, and the modifications made by the person skilled in the art without departing from the spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A tooling for disassembling the intermediate shaft of an automotive drive axle main reducer, characterized in that: include The positioning assembly includes a base plate (1), a first positioning sleeve (2) and a second positioning sleeve (3) vertically fixed on the base plate (1). The upper end of the first positioning sleeve (2) is fitted with a clearance fit at the lower end opening of the input shaft mounting hole (4). The upper end face of the second positioning sleeve (3) is the supporting surface of the main reducer housing (5). The axial projection of the intermediate shaft (6) mounting hole is located in the inner hole of the second positioning sleeve (3). The first positioning sleeve (2) and the second positioning sleeve (3) horizontally position the main reducer housing (5). The top pressure assembly includes a guide sleeve (7) and a top pressure shaft (8). The guide sleeve (7) is positioned at the upper opening of the mounting hole of the intermediate shaft (6) to guide the top pressure shaft (8). The top pressure shaft (8) is a stepped shaft. Its large diameter section (9) is used to slide in the inner hole of the guide sleeve (7), and its downwardly extending small diameter section (10) is used to extend into the inner hole of the tapered roller bearing (11) to apply downward pressure to the intermediate shaft (6). The step of the top pressure shaft (8) cooperates with the upper end face of the tapered roller bearing (11) to restrict the axial movement of the top pressure shaft (8).

2. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The outer wall of the guide sleeve (7) is stepped, and its stepped surface (12) abuts against the upper end surface of the main reducer housing (5). Its downwardly extending outer diameter section (13) extends into the mounting hole of the intermediate shaft (6) and positions the guide sleeve (7) at the upper opening of the mounting hole of the intermediate shaft (6).

3. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The bottom of the first positioning sleeve (2) and / or the second positioning sleeve (3) is provided with a downwardly extending positioning pin (14). The positioning pin (14) is interference-fitted into the mounting hole (15) opened on the base plate (1) to vertically fix the first positioning sleeve (2) and the second positioning sleeve (3) on the base plate (1).

4. The disassembly fixture for the intermediate shaft of the automotive drive axle main reducer as described in claim 1, characterized in that: The first positioning sleeve (2) and / or the second positioning sleeve (3) are provided with a radially extending mounting flange (16) at the bottom. The fastening bolt passes through the mounting flange (16) to vertically fix the first positioning sleeve (2) and the second positioning sleeve (3) on the base plate (1).

5. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The first positioning sleeve (2) has a positioning flange (17) at its upper end, and the positioning flange (17) is fitted with the flange (18) shaft hole at the lower end opening of the input shaft mounting hole (4).

6. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The axial distance between the first positioning sleeve (2) and the second positioning sleeve (3) is equal to the axial distance between the input shaft (4) and the intermediate shaft (6) of the main reducer housing (5).

7. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The second positioning sleeve (3) has an opening groove (19) on the side facing the first positioning sleeve (2).

8. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The first positioning sleeve (2) and the second positioning sleeve (3) have the same axial height.

9. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The axial length of the small diameter section (10) of the top pressure shaft (8) is less than the axial height of the second positioning sleeve (3).

10. The intermediate shaft disassembly fixture for the automotive drive axle main reducer as described in claim 1, characterized in that: The top pressure shaft (8) has an upward-opening assembly hole (21), which is used to mate with the lower pressure rod of the hydraulic press.

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