Differential shell tensioning tool

Abstract

The utility model provides a differential shell tensioning tool. The differential shell tensioning tool comprises a tensioning sleeve, a first nut, a tool pull rod, a conical disc, a flange and a second nut. The flange is connected with a numerical control lathe spindle, one end of the conical disc is connected with the flange, the other end of the conical disc is an outer conical surface, the expansion sleeve is an inner conical surface and matched with the outer conical surface of the conical disc, and the tool pull rod is movably sleeved with the expansion sleeve. The rear end of the tool pull rod is connected with a second nut, the front end of the tool pull rod is connected with a first nut, the rear end of the second nut is connected with a numerical control machine tool pull rod, and the outer surface of the expansion sleeve is matched with an inner hole of the differential shell. The expansion sleeve is locked through the nut, when the expansion sleeve is abraded or cracked, the expansion sleeve can be detached and replaced by taking down the nut, the expansion sleeve can be replaced independently, and the use cost is reduced. And meanwhile, the time for remodeling or replacing the expansion sleeve is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts manufacturing, in particular to a differential housing tightening tool. Background Art

[0002] In the manufacture of automobile differentials, the differential housing and end faces need to be machined. The existing fixtures for turning the outer circle and end faces of the differential housing include expansion sleeves and pull rods. The expansion sleeves and pull rods are an integrated bonding structure. The expansion sleeves and pull rods are an integral structure with high technical requirements and a long manufacturing cycle. During use, if the clamping is not in place or the cutting force is greater than the clamping force, the parts will slip and the expansion sleeve will crack immediately, resulting in scrap. Since the expansion sleeve is fixed with adhesive and stuck in the pull rod, it cannot be replaced separately. Therefore, the entire set needs to be replaced during maintenance. At the same time, the expansion sleeve and pull rod must be replaced, which has high maintenance costs. Utility Model Content

[0003] The utility model provides a differential case tensioning tool, which separates the expansion sleeve from the pull rod by designing a new pull rod and expansion sleeve structure, and uses a nut to lock the expansion sleeve. When the expansion sleeve is worn or cracked, the nut can be removed to remove and replace the expansion sleeve, and the expansion sleeve can be replaced separately, which reduces the use cost. At the same time, it also improves the time for changing or replacing the expansion sleeve and improves production efficiency.

[0004] A differential case tightening tool is used for clamping the differential case and performing the turning outer circle and end surface processing steps of the differential case (8), comprising an expansion sleeve, a first nut, a tool tie rod, a cone disk, a flange and a second nut; the flange is connected to the main shaft of a numerically controlled lathe, one end of the cone disk is connected to the flange and the other end is configured as an outer cone surface, the expansion sleeve is configured as an inner cone surface and cooperates with the outer cone surface of the cone disk, the expansion sleeve is movably sleeved on the tool tie rod; the tool tie rod passes through the cone disk and the expansion sleeve, the rear end of the tool tie rod is connected to the second nut and the front end is connected to the first nut, the rear end of the second nut is connected to the CNC machine tool tie rod, and the outer surface of the expansion sleeve cooperates with the inner hole of the differential case.

[0005] The utility model adopts a split structure of three main components, namely, an expansion sleeve, a tooling pull rod and a first nut, to replace the original integrated bonding structure of the expansion sleeve and the pull rod. The design structure is simple, the technical requirements are low, and the manufacturing cycle of parts is short. After the shape is changed or the expansion sleeve is worn or cracked, the first nut can be unscrewed, the old expansion sleeve can be taken out and replaced with a new one, which is convenient for changing the shape of the expansion sleeve, reduces the replacement time of the expansion sleeve, and has lower maintenance costs.

[0006] Preferably, it also includes a positioning ring, which is connected to the outside of the cone disk, and the front end of the positioning ring abuts against the rear end of the differential housing. The tailstock of the CNC lathe is controlled to extend the top to contact the workpiece and move it to the left to fit the positioning ring, thereby ensuring the consistency of the axial size of the workpiece when cutting.

[0007] Preferably, a first step is provided on the tooling pull rod, a second step is provided on the expansion sleeve, the second step is provided on the inner hole of the expansion sleeve, and the first step, the second step and the first nut are provided in sequence from back to front. The travel of the expansion sleeve can be limited, positioning can be performed, and appropriate tightening force of the expansion sleeve can be ensured.

[0008] Preferably, the utility model further comprises a top, the rear end of the top matches the front end of the differential housing and the front end is connected to the tailstock of the CNC lathe. The tailstock of the CNC lathe is controlled to make the top extend and contact the workpiece to the left to fit the positioning ring, so as to achieve clamping of both ends of the tooling, more stable clamping and better coaxiality.

[0009] Specifically, in the utility model, the taper of the expansion sleeve is 1:8.5-1:7. The use of this taper can effectively reduce the matching propulsion resistance of the expansion sleeve and the cone disc, and ensure that the inner hole of the differential housing is fully tightened.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] Under the premise of satisfying the use function and product precision, a new pull rod and expansion sleeve structure is designed to separate the expansion sleeve from the tooling pull rod, and the first nut is used to lock the expansion sleeve. When the expansion sleeve is worn or cracked, the first nut can be removed to remove and replace the expansion sleeve, which reduces the use cost. At the same time, it also shortens the time for changing or replacing the expansion sleeve and improves production efficiency.

[0012] It is more versatile. In daily use, it is necessary to process differential housing workpieces of different sizes. The tooling must be compatible with at least two workpieces with different inner diameters. Because the stroke of the expansion sleeve is within the range of 0.5mm, different workpieces need to replace expansion sleeves of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a working state diagram of a differential case tensioning tool.

[0014] Figure 2 This is a diagram of the matching structure of the expansion sleeve, the first nut and the tooling pull rod described in the utility model.

[0015] Figure 3 It is a structural schematic diagram of an integrated bonding structure of an expansion sleeve and a tooling pull rod in the prior art.

[0016] In the figure: 1-expansion sleeve, 11-second step, 2-first nut, 3-tooling pull rod, 31-first step, 4-cone disk, 5-flange, 6-second nut, 7-locating ring, 8-differential housing, 9-top. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or structure referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] Embodiment 1:

[0020] This embodiment is an improvement on the defects of the integral bonding structure of the expansion sleeve 1 and the tooling pull rod 3 in the prior art. Figure 3 As shown, in the prior art, the expansion sleeve 1 and the tooling pull rod 3 are designed as an integrated bonding structure, the front end structure of the tooling pull rod 3 and the tooling rod body are an integrated structure, the expansion sleeve 1 cannot be removed separately, and once the clamping is not in place or the cutting force is greater than the clamping force during use, the parts will slip and the expansion sleeve 1 will immediately crack and become scrapped. In daily use and maintenance, the expansion sleeve 1 and the pull rod need to be replaced at the same time, and the maintenance cost is high.

[0021] like Figure 1 and Figure 2 As shown, a differential case tensioning tool shown in this embodiment includes a tensioning sleeve 1, a first nut 2, a tooling pull rod 3, a cone disk 4, a flange 5 and a second nut 6. One end of the cone disk 4 is connected to the flange 5 and the other end is constructed as an outer cone surface. The tensioning sleeve 1 is constructed as an inner cone surface and cooperates with the outer cone surface of the cone disk 4. The tensioning sleeve 1 is movably sleeved on the tooling pull rod 3; the tooling pull rod 3 passes through the cone disk 4 and the tensioning sleeve 1, the rear end of the tooling pull rod 3 is connected to the second nut 6 and the front end is connected to the first nut 2, and the outer surface of the tensioning sleeve 1 cooperates with the inner hole of the differential case 8.

[0022] The present embodiment adopts a separate structure of the expansion sleeve 1, the tooling pull rod 3, and the first nut 2 to replace the original expansion sleeve 1 and the tooling pull rod 3 integrally bonded structure. The new structure of the expansion sleeve 1 has lower replacement and maintenance costs. In daily use, the tooling must be compatible with at least two or more workpieces with different inner diameters. Because the stroke of the expansion sleeve 1 is within the range of 0.5mm, different workpieces need to replace expansion sleeves 1 of different diameters. When replacing, only the first nut 2 at the front end of the tooling pull rod 3 needs to be removed, the old or damaged expansion sleeve 1 is taken out, and then the new expansion sleeve 1 is inserted.

[0023] Embodiment 2:

[0024] like Figure 1As shown, a differential case tensioning fixture is used to clamp the differential case 8 and perform the outer circle turning and end surface machining process of the differential case 8. The differential case 8 provides a supporting assembly base for the planetary gears, half-axle gears, etc. of the differential. When the car turns, the differential case 8 has unequal rotation speeds with the inner and outer wheels to ensure smooth turning of the car.

[0025] like Figure 1 As shown, in this embodiment, the direction of the CNC lathe spindle is defined as the rear, and the direction of the differential housing 8 is defined as the front. A differential housing tensioning tool of this embodiment includes a tensioning sleeve 1, a first nut 2, a tooling pull rod 3, a cone disk 4, a flange 5 and a second nut 6; the flange 5 is connected to the CNC lathe spindle, one end of the cone disk 4 is connected to the flange 5 and the other end is constructed as an outer cone surface, that is, the right end of the cone disk 4 is an outer cone surface, and the cone disk 4 is constructed as a structure with a gradually decreasing diameter from back to front, the tensioning sleeve 1 is constructed as an inner cone surface and cooperates with the outer cone surface of the cone disk 4, and the tensioning sleeve 1 is movably sleeved on the tooling pull rod 3; the tooling pull rod 3 passes through the cone disk 4 and the tensioning sleeve 1, the rear end of the tooling pull rod 3 is connected to the second nut 6 and the front end is connected to the first nut 2, the rear end of the second nut 6 is connected to the CNC machine tool pull rod, and the outer surface of the tensioning sleeve 1 cooperates with the inner hole of the differential housing 8.

[0026] This embodiment further includes a positioning ring 7 , which is connected to the outside of the cone disc 4 , and the front end of the positioning ring 7 abuts against the rear end of the differential housing 8 .

[0027] like Figure 2 As shown, in this embodiment, a first step 31 is provided on the tooling pull rod 3, a second step 11 is provided on the expansion sleeve 1, and the first step 31, the second step 11 and the first nut 2 are arranged in sequence from back to front.

[0028] like Figure 1 As shown, this embodiment further includes a center 9, the rear end of which cooperates with the front end of the differential housing 8 and the front end is connected to the tailstock of the CNC lathe.

[0029] like Figure 2 As shown, in this embodiment, the taper of the expansion sleeve 1 is 1:8.5-1:7, and the inner hole of the expansion sleeve 1 in this embodiment has a certain taper, usually 1:8.5-1:7. The cylinder manufactured according to the required size is usually made of high-quality spring steel such as 65Mn steel, 60Si2Mn steel, 50CrVA steel, etc., and is manufactured through rough machining, fine machining, quenching, tempering, wire cutting or gluing, etc., and has good strength, ductility and fatigue resistance.

[0030] The method of using this embodiment is as follows:

[0031] During clamping: manually or mechanically install the differential housing 8, that is, the workpiece, onto the expansion sleeve 1, and control the tailstock of the CNC lathe to make the center 9 extend and contact the differential housing 8 to move leftward to fit the positioning ring 7, so as to ensure the consistency of the axial dimension of the workpiece during cutting. When the pull rod of the CNC lathe is pulled back, the tooling pull rod 3 is driven to move leftward, and the tooling pull rod 3 causes the expansion sleeve 1 to move leftward as well. The internal cone angle of the expansion sleeve 1 cooperates with the outer cone surface of the cone disk 4 to increase the inner hole diameter of the differential housing 8, thereby tightening the inner hole of the differential housing 8.

[0032] When loosening the clamp: control the tailstock of the CNC lathe to retract the center 9 and disengage from the differential housing 8. The pull rod of the CNC lathe is pushed forward to drive the tooling pull rod 3 to move to the right, and the tooling pull rod 3 causes the expansion sleeve 1 to move to the right. The internal cone angle of the expansion sleeve 1 disengages from the cone part of the cone disk 4 to reduce the diameter. The expansion sleeve 1 releases the workpiece, and the workpiece is removed manually or by a robot.

Claims

1. A differential case tensioning tool, characterized in that The invention comprises an expansion sleeve (1), a first nut (2), a tooling pull rod (3), a cone disk (4), a flange (5) and a second nut (6); one end of the cone disk (4) is connected to the flange (5) and the other end is constructed as an outer cone surface, the expansion sleeve (1) is constructed as an inner cone surface and matches with the outer cone surface of the cone disk (4), and the expansion sleeve (1) is movably mounted on the tooling pull rod (3); the tooling pull rod (3) passes through the cone disk (4) and the expansion sleeve (1), the rear end of the tooling pull rod (3) is connected to the second nut (6) and the front end is connected to the first nut (2), and the outer surface of the expansion sleeve (1) matches with the inner hole of the differential housing (8).

2. The differential case tensioning tool according to claim 1, characterized in that: It also comprises a positioning ring (7), which is connected to the outside of the cone disk (4), and the front end of the positioning ring (7) is in abutment with the rear end of the differential housing (8).

3. The differential case tensioning tool according to claim 1, characterized in that: A first step (31) is arranged on the tooling pull rod (3), a second step (11) is arranged on the expansion sleeve (1), and the first step (31), the second step (11) and the first nut (2) are arranged in sequence from back to front.

4. The differential case tensioning tool according to claim 1, characterized in that: It also includes a center (9), the rear end of which cooperates with the front end of the differential housing (8), and the front end is connected to the tailstock of a numerically controlled lathe.

5. The differential case tensioning tool according to claim 1, characterized in that: The taper of the expansion sleeve (1) is 1:8.5-1:7.

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