Front edge clamp for machining rear hub of rear axle of automobile

Abstract

The utility model provides a seam allowance clamp for machining a rear hub of an automobile rear axle, which relates to the technical field of machining of the rear hub of the automobile rear axle and comprises a finish turning rear hub upper die, a finish turning rear hub lower die and a fixing nut. Compared with the original turning precision, the tool is adopted to accurately fix the rear hub by taking the bearing shell as a reference, then finish turning is performed on the rear half axle mounting surface, and the machining perpendicularity and the jerk value between the brake drum mounting surface and the bearing shell as well as between the brake drum mounting spigot and the bearing shell are effectively reduced and meet the production requirements without out of tolerance; and therefore, the probability of breakage of the half shaft in the follow-up rear axle operation process is greatly reduced, the service life of the rear axle is effectively prolonged, and the turning effect in the rear hub production and machining process is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to automobile rear axle rear hub processing technical field, specifically, relate to a kind of for processing automobile rear axle rear hub's mouth stop clamp. BACKGROUND

[0002] Rear axle, it is to refer to the rear drive axle component part of vehicle power transmission. It is composed of rear hub, axle shaft, bearing shell, brake drum and differential etc.

[0003] Currently in the first bearing shell and the second bearing shell are accurately pressed in rear hub in succession, and the axle shaft mounting surface of rear hub, brake drum mounting surface and brake drum mounting mouth stop need to be turned in process (wherein the inside of bearing shell is formed with taper surface to make subsequent bearing installation complete after operation more smoothly), but during turning, it cannot be accurately positioned with bearing shell as reference and then subsequent turning correction error correction effect of axle shaft mounting surface, brake drum mounting surface and brake drum mounting mouth stop is general.

[0004] Specifically, the perpendicularity of axle shaft mounting surface relative to two bearing shells after turning is about 0.2MM, causing excess, and then subsequent oil infiltration three-pack rate is higher, while the runout of brake drum mounting surface is about 0.15MM, and the perpendicularity of brake drum mounting mouth stop relative to two bearing shells is about 0.15MM, causing excess, which can cause large runout after brake drum installation, and then the probability of axle shaft fracture is greatly increased during subsequent rear axle operation, thereby reducing the service life of rear axle, and the turning process of existing rear hub needs to be further optimized. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problem in the above background art, and further provides a mouth stop clamp for processing automobile rear axle rear hub.

[0006] The utility model solves the technical problems by adopting the following technical scheme:

[0007] A mouth stop clamp for processing automobile rear axle rear hub, comprising fine turning rear hub upper die, fine turning rear hub lower die and fixed nut,

[0008] The fine turning rear hub upper die comprises a limiting portion, a mounting portion and a threaded portion, and the fine turning rear hub upper die is connected with the lathe;

[0009] The limiting portion is in contact with the taper surface of the first bearing shell;

[0010] The fine turning rear hub lower die is movably sleeved on the mounting portion and in contact with the taper surface of the second bearing shell, and a through hole with a size matching that of the mounting portion is formed in the fine turning rear hub lower die;

[0011] The fixed nut is in threaded engagement with the threaded part and in contact with the fine-turning rear hub lower die to accurately and stably define the rear hub on the fine-turning rear hub upper die.

[0012] Further, the fine-turning rear hub sleeve is provided with a through hole matching the size of the threaded part, and is movably sleeved on the threaded part and between the fine-turning rear hub lower die and the fixed nut.

[0013] The fine-turning rear hub sleeve can shorten the movement range of the fixed nut, so that the accurate and stable positioning of the rear hub on the tooling can be completed without entering the rear hub.

[0014] Further, the fine-turning rear hub upper die, the fine-turning rear hub lower die and the fine-turning rear hub sleeve are made of Cr12 alloy steel and have a quenched and tempered hardness of HRC50-55.

[0015] Further, the perpendicularity of the two end faces of the fine-turning rear hub sleeve relative to the center is less than or equal to 0.015mm.

[0016] Further, the perpendicularity of the end face of the fixed nut relative to the center is less than or equal to 0.015mm.

[0017] Further, the gap between the fine-turning rear hub upper die and the fine-turning rear hub lower die is less than or equal to 0.07mm.

[0018] Further, the fine-turning rear hub upper die is integrally formed.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] Compared with the original turning accuracy, the machining perpendicularity and the runout between the rear hub, the rear axle half shaft mounting surface, the brake drum mounting surface and the brake drum mounting stopper and the bearing shell are effectively reduced and meet the production requirements without exceeding the tolerance by using the tooling to accurately fix the rear hub based on the bearing shell, so that the probability of the half shaft fracture in the subsequent rear axle operation process is greatly reduced, the service life of the rear axle is effectively prolonged, and the turning effect in the rear hub production and processing process is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the present application;

[0022] Figure 2 It is a fine-turning rear hub upper die schematic view;

[0023] Figure 3 It is a fine-turning rear hub lower die schematic view;

[0024] Figure 4 It is a fine-turning rear hub sleeve schematic view;

[0025] Figure 5 schematic view of fixing nut;

[0026] Reference signs:

[0027] 1, the upper die of the finish machining rear hub; 2, the limiting part; 3, the mounting part; 4, the threaded part; 5, the lower die of the finish machining rear hub; 6, the through hole; 7, the fixing nut; 8, the finish machining rear hub sleeve; 9, the through hole. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The present application is further described with reference to the drawings and embodiments:

[0029] As shown in Figures 1 to 5 Fig. 1, a mouth clamp for machining the rear hub of the rear axle of an automobile comprises an upper die 1 for finish machining the rear hub, a lower die 5 for finish machining the rear hub, and a fixing nut 7,

[0030] The upper die 1 for finish machining the rear hub is integrally formed and comprises a limiting part 2, a mounting part 3, and a threaded part 4. The upper die 1 for finish machining the rear hub is connected to a lathe (not shown in the figure).

[0031] The limiting part 2 is in close contact with the conical surface of the first bearing shell.

[0032] The lower die 5 for finish machining the rear hub is provided with a through hole 6 matching the size of the mounting part 3, and is movably sleeved on the mounting part 3 and in close contact with the conical surface of the second bearing shell.

[0033] The fixing nut 7 is in threaded cooperation with the threaded part 4 and in contact with the lower die 5 for finish machining the rear hub, so that the rear hub is accurately and stably defined on the upper die 1 for finish machining the rear hub (specifically, the end face of the fixing nut 7 is less than or equal to 0.015 mm in perpendicularity relative to the center).

[0034] Further refinement of the embodiment of the present application also includes a finish machining rear hub sleeve 8, which is provided with a through hole 9 matching the size of the threaded part 4 and is movably sleeved on the threaded part 4 and between the lower die 5 for finish machining the rear hub and the fixing nut 7. The finish machining rear hub sleeve 8 is less than or equal to 0.015 mm in perpendicularity relative to the center at both end faces.

[0035] The gap between the fine turning rear hub upper die 1 and the fine turning rear hub lower die 5 after combination is less than or equal to 0.07mm, further, the length of the fine turning rear hub lower die 5 is 30-32mm, preferably, the length of the fine turning rear hub lower die 5 is 30mm so as to facilitate installation and accurate fixing of the rear hub.

[0036] Further optimization of the above embodiment, the fine turning rear hub upper die 1, the fine turning rear hub lower die 5 and the fine turning rear hub sleeve 8 are all made of Cr12 alloy steel and have a quenched and tempered hardness of HRC50-55.

[0037] The working process of the utility model is as follows:

[0038] Firstly, the rear hub is passed through the fine turning rear hub upper die 1 from right to left, and when the limiting portion 2 accurately abuts against the conical surface of the first bearing shell and is in close contact, the horizontal position of the rear hub is defined, then the fine turning rear hub lower die 5 is sleeved on the mounting portion 3 and is in accurate contact with the conical surface of the second bearing shell, when the fine turning rear hub upper die 1 and the fine turning rear hub lower die 5 accurately cooperate with the conical surfaces of the two bearing shells, the fixed nut 7 is rotated to make the fixed nut 7 contact with the fine turning rear hub lower die 5, and then the rear hub is defined on the fine turning rear hub upper die 1.

[0039] On this basis, by additionally arranging the fine turning rear hub sleeve 8, the movement range of the fixed nut 7 can be shortened, and the accurate and firm positioning of the rear hub on the tooling can be completed without entering the rear hub;

[0040] Then the fine turning machining of the half shaft mounting surface, the brake drum mounting surface and the brake drum mounting stopper of the rear hub can be carried out, it should be noted that the oil seal mounting hole, the bearing mounting hole, the half shaft mounting surface, the brake drum mounting surface and the brake drum mounting stopper of the rear hub are machined at one time, but the half shaft mounting surface, the brake drum mounting surface and the brake drum mounting stopper have a fine turning allowance of 0.5mm;

[0041] When the bearing shell is accurately defined as the reference to define the position of the rear hub and the above three regions are fine turned, the perpendicularity of the half shaft mounting surface relative to the two bearing shells is less than or equal to 0.05mm (originally 0.2mm), the oil leakage three-pack rate of the end surface is reduced from 1.8% to 0.06%, and the oil leakage three-pack rate is significantly reduced, thereby greatly reducing the hidden trouble of oil leakage in the subsequent rear axle operation process;

[0042] At the same time, the brake drum mounting surface jump amount is reduced from 0.15mm to 0.05mm, the perpendicularity of the brake drum mounting stopper relative to the two bearing shells is reduced from 0.15mm to 0.05mm, and the brake drum mounting stopper jump amount is reduced from 0.2mm to 0.1mm, thereby the jump amount after the brake drum is mounted is also significantly reduced;

[0043] In summary, compared with the original turning accuracy, the machining perpendicularity and the runout between the rear hub mounting surface, the brake drum mounting surface and the brake drum mounting stopper and the bearing shell are effectively reduced and meet the production requirements without exceeding the tolerance after the rear hub is accurately fixed by taking the bearing shell as the reference and then the rear axle mounting surface, the brake drum mounting surface and the brake drum mounting stopper are precisely machined, so that the probability of the half axle fracture in the subsequent rear axle operation process is greatly reduced, the service life of the rear axle is effectively prolonged, and the turning effect in the rear hub production and machining process is significantly improved.

[0044] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A rear wheel hub necking jig for machining automobile rear axle rear wheel hub, comprising a rear wheel hub finishing upper die (1), a rear wheel hub finishing lower die (5) and a fixing nut (7), wherein the rear wheel hub finishing upper die (1) comprises a limiting part (2), a mounting part (3) and a threaded part (4), and the rear wheel hub finishing upper die (1) is connected with a lathe; the limiting part (2) is in close contact with the conical surface of the first bearing housing; the rear wheel hub finishing lower die (5) is movably sleeved on the mounting part (3) and in close contact with the conical surface of the second bearing housing, and a through hole (6) with the same size as the mounting part (3) is formed in the rear wheel hub finishing lower die (5); the fixing nut (7) is in threaded connection with the threaded part (4) and in contact with the rear wheel hub finishing lower die (5) so as to accurately and stably define the rear wheel hub on the rear wheel hub finishing upper die (1). Further comprising a rear wheel hub finishing sleeve (8), wherein a through hole (9) with the same size as the threaded part (4) is formed in the rear wheel hub finishing sleeve (8), and the rear wheel hub finishing sleeve (8) is movably sleeved on the threaded part (4) and between the rear wheel hub finishing lower die (5) and the fixing nut (7). The rear wheel hub finishing upper die (1), the rear wheel hub finishing lower die (5) and the rear wheel hub finishing sleeve (8) are all made of Cr12 alloy steel and have a quenched and tempered hardness of HRC50-55. The perpendicularity of the two end faces of the rear wheel hub finishing sleeve (8) relative to the center is less than or equal to 0.015mm. The perpendicularity of the end face of the fixing nut (7) relative to the center is less than or equal to 0.015mm.

2. The trimming fixture for machining the rear hub of the rear axle of an automobile according to claim 1, wherein The gap between the rear wheel hub finishing upper die (1) and the rear wheel hub finishing lower die (5) is less than or equal to 0.07mm.

3. The trimming fixture for machining the rear wheel hub of the rear axle of an automobile according to claim 2, wherein The rear wheel hub finishing upper die (1) is integrally formed.

4. The trimming fixture for machining the rear wheel hub of the rear axle of an automobile according to claim 2, wherein ​ 5. The trimming fixture for machining the rear hub of the rear axle of an automobile according to claim 1, wherein ​ 6. The trimming fixture for machining the rear hub of the rear axle of an automobile according to claim 1, wherein ​ 7. The trimming fixture for machining the rear wheel hub of the rear axle of an automobile according to claim 1, wherein ​

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