A differential housing drilling tool

Abstract

This utility model belongs to the field of differential housing processing technology, and in particular relates to a differential housing drilling fixture. The fixture includes a rotary worktable, a differential housing, and a clamp mounted on the rotary worktable. The clamp includes a positioning component and a clamping component. The positioning component includes a clamp base plate with a positioning hole in the center. A positioning ring and several pads evenly distributed around the circumference of the positioning ring are fixedly connected to the top of the base plate. The inner ring of each pad has a chamfered transition. The outer end of the clamp base plate has symmetrically arranged fan-shaped countersunk holes. Through the radial fit between the positioning ring and the outer wall of the bell-shaped housing, the axial support of the pads on the flange, and the reference established between the positioning pin and the end face of the half-shaft hole, precise positioning and reliable clamping of the differential housing are achieved. This device can complete the processing of slotted holes and locking pin holes in one clamping operation. Compared with traditional multiple clamping methods, it avoids accumulated positioning errors and wear of positioning elements, improving processing efficiency and accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of differential housing processing technology, and in particular relates to a differential housing drilling tool. Background Technology

[0002] In automotive transmission systems, the differential housing is a critical structural component, its main function being to house the differential mechanism and achieve optimal power distribution. The differential housing typically employs a bell-shaped design, requiring slotted holes and locking pin holes to be drilled at specific locations during machining for connection and positioning with other transmission components. The machining precision requirements for these holes are stringent; technical indicators such as hole diameter tolerances, positional accuracy, and surface roughness must all meet design requirements.

[0003] Traditional differential housing drilling fixtures typically require multiple clamping operations to complete the machining of different holes. First, the differential housing is clamped onto a special fixture to machine a slotted hole. After machining, the fixture must be released, the workpiece position adjusted, and then re-clamped before machining the locking pin hole. This step-by-step machining method requires the operator to manually adjust the workpiece posture and fixture position multiple times.

[0004] However, the above-mentioned machining fixtures have the following problems during use: First, multiple clamping operations are inefficient and cannot meet the needs of mass production. Second, multiple clamping operations will generate cumulative positioning errors, affecting the positional accuracy relationship between the slotted hole and the locking pin hole, resulting in a decrease in the machining accuracy of the hole system. Utility Model Content

[0005] In view of the technical problems existing in the background art, this utility model provides a differential housing drilling tool.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows: A differential housing drilling fixture includes a rotary table and a differential housing. The differential housing includes a bell-shaped cover with a through-hole for a half-shaft at the outer end of the bell-shaped cover. A flange is fixedly connected to the top of the bell-shaped cover, and a bushing is fixedly connected to the top of the flange. A locking pin hole is provided at the outer end of the flange, and a slotted hole is provided at the outer end of the bell-shaped cover. The fixture also includes a positioning component and a clamping component mounted on the rotary table. The positioning assembly includes a fixture base plate fixedly connected to a rotary table. A positioning hole is formed in the center of the fixture base plate. A positioning ring is fixedly connected to the top of the fixture base plate, with its inner wall abutting against the outer wall of a bell-shaped cover. Several pads evenly distributed around the circumference of the positioning ring are fixedly connected to the top of the fixture base plate, with their tops abutting against a flange. The inner rings of the pads have a chamfered transition. Symmetrically arranged fan-shaped countersunk holes are formed at the outer end of the fixture base plate. A first tool-avoiding hole is formed at the bottom of each fan-shaped countersunk hole, with the axis of the first tool-avoiding hole perpendicularly intersecting the axis of the positioning hole in the same plane. Optionally, the clamping assembly includes a plurality of first fixing cylinders fixedly connected to the bottom end of the clamp base plate, and a second fastening cylinder is provided at the bottom end of each of the plurality of first fixing cylinders. A base plate is fixedly connected to the bottom end of the second fastening cylinder, and a plurality of threaded holes corresponding to the second fastening cylinder are opened at the bottom end of the base plate. The first fixing cylinders and the second fastening cylinders are fixedly connected by fastening screws.

[0007] Optionally, a second knife-avoiding hole is provided at the bottom end of the base plate, and a rectangular through hole is also provided at the bottom end of the base plate. A threaded hole is provided on the side wall of the rectangular through hole, and a fastening screw is provided in the threaded hole. A through hole is provided in the middle of the base plate.

[0008] Optionally, the inner wall of the through hole is provided with a locking rod, which is fixedly connected to the base plate by a fastening screw in the threaded hole. The outer wall of the locking rod is threaded with a clamping nut, and the outer end of the locking rod is slidably connected with a clamping ring. The top end of the clamping ring abuts against the clamping nut, and the bottom end of the clamping ring abuts against the end face of the bushing.

[0009] Optionally, a connecting plate is fixedly connected to the bottom end of the fixture base plate by fastening screws, and a U-shaped guide sleeve is fixedly connected to the outer end of the connecting plate.

[0010] Optionally, the top of the base plate is fixedly connected to two symmetrically arranged positioning blocks, and the ends of the positioning blocks are fixedly connected to positioning pins that pass through the positioning blocks. Both positioning pins abut against the end face of the half shaft hole.

[0011] This utility model has the following advantages and beneficial effects: In this invention, by setting up positioning and clamping components, the differential housing is precisely positioned and installed using its own bell-shaped outer wall, flange, and half-shaft hole end face. The radial fit between the positioning ring and the bell-shaped outer wall, the axial support of the flange by the pad, and the reference established by the positioning pin and the half-shaft hole end face, combined with multi-point support and adjustable clamping force, reliably fixes the differential housing to the tooling. This method allows for convenient and quick precise installation of the differential housing and multi-hole machining in a single clamping, ensuring machining accuracy. Compared to traditional multiple clamping and manual adjustment methods, it avoids the problems of accumulated positioning errors and low efficiency caused by repeated clamping, and eliminates frictional wear on the positioning elements during multiple clamping processes, thus ensuring long-term positioning accuracy and machining quality. Attached Figure Description

[0012] Figure 1 This is an overall structural diagram of the differential housing drilling fixture of this utility model; Figure 2 This is an overall structural diagram of the differential housing of this utility model; Figure 3 This is a partial view of the differential housing drilling fixture of this utility model; Figure 4This is a diagram showing the machining process of the slotted hole in the differential housing of this utility model. Figure 5 This is a diagram showing the machining process of the differential housing locking pin hole of this utility model. Figure 6 This is a top view of the differential housing drilling fixture of this utility model; Figure 7 This utility model Figure 6 A cross-sectional view along the AA direction; Figure 8 This utility model Figure 6 A cross-sectional view along the BB direction; Figure 9 This is a structural diagram of the positioning component of this utility model; Figure 10 This is a structural diagram of the guide sleeve of this utility model; Figure 11 This is a structural diagram of the base plate of this utility model.

[0013] Reference numerals: 1. Rotary worktable; 201. Bell-shaped cover; 202. Half-shaft hole; 203. Flange; 204. Bushing; 205. Locking pin hole; 206. Slotted hole; 3. Fixture base plate; 4. Positioning hole; 5. Positioning ring; 6. Pad; 7. Transition chamfer; 8. Fan-shaped countersunk hole; 9. First tool avoidance hole; 10. First fixing cylinder; 11. Second fastening cylinder; 12. Base plate; 13. Second tool avoidance hole; 14. Rectangular through hole; 15. Threaded hole; 16. Through hole; 17. Locking rod; 18. Clamping nut; 19. Clamping ring; 20. Connecting plate; 21. U-shaped guide sleeve; 22. Positioning block; 23. Positioning pin. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] Example like Figures 1-2 As shown, a differential housing drilling fixture is used to process the slotted hole 206 and the locking pin hole 205 of the differential housing, including a rotary table 1 and a differential housing.

[0017] The differential housing has a typical bell-shaped structure, including a bell-shaped cover 201. The outer end of the bell-shaped cover 201 has a half-shaft hole 202 that passes through the bell-shaped cover 201. A flange 203 is fixedly connected to the top of the bell-shaped cover 201. A bushing 204 is fixedly connected to the top of the flange 203. A locking pin hole 205 is opened at the outer end of the flange 203. A slotted hole 206 is opened at the outer end of the bell-shaped cover 201. Based on the above structural features of the differential housing, the present invention designs a corresponding fixture.

[0018] like Figures 1-4 As shown, the present invention also includes a fixture mounted on the rotary table 1. The fixture includes a positioning component and a clamping component. The positioning component is used to achieve precise radial and axial positioning of the differential housing, and the clamping component is used to stably clamp the differential housing during the machining process to ensure machining accuracy.

[0019] The positioning assembly includes a fixture base plate 3 fixedly connected to the rotary table 1. A positioning hole 4 is provided in the middle of the fixture base plate 3. The positioning hole 4 is used to accommodate the bell-shaped cover 201 of the differential housing. The size of the hole is determined according to the outer diameter of the bell-shaped cover 201. A positioning ring 5 is fixedly connected to the top of the fixture base plate 3. The inner wall of the positioning ring 5 abuts against the outer wall of the bell-shaped cover 201 to achieve radial positioning of the differential housing. Several pads 6 are also fixedly connected to the top of the fixture base plate 3, which are evenly distributed around the circumference of the positioning ring 5. The top of the pads 6 abuts against the flange 203 to achieve axial positioning and support of the differential housing. When the clamping assembly clamps, the pads 6 can disperse the clamping force to prevent the bottom end of the flange 203 from deforming due to excessive local force. At the same time, it ensures the uniform distribution of clamping force and improves the stability and reliability of clamping. The inner ring of the pads 6 is provided with a transition chamfer 7 to avoid stress concentration caused by sharp edges or damage to the outer wall of the bell-shaped cover 201.

[0020] The outer end of the fixture base plate 3 is provided with symmetrically arranged fan-shaped countersunk holes 8. The bottom end of the fan-shaped countersunk holes 8 is provided with a first tool avoidance hole 9, which is used for the feed and retraction of the tool when machining the slotted hole 206. The axis of the first tool avoidance hole 9 intersects perpendicularly with the axis of the positioning hole 4 in the same plane, which can avoid assembly problems caused by drilling tilt.

[0021] After the differential housing is clamped and positioned, as follows: Figure 1 As shown, this is the initial state. When machining the slotted hole 206, the rotary table 1 drives the fixture to rotate 90 degrees, and the CNC machine tool drives the drill rod to machine one of the slotted holes 206. After machining is completed, the rotary table 1 drives the fixture to continue rotating 180 degrees to machine the other slotted hole 206, as shown. Figure 4 As shown, after the slotted hole 206 is machined, the rotary table 1 drives the fixture back to the starting position. Figure 1The initial position is shown. Then, the rotary table 1 rotates the fixture 180 degrees again to machine the locking pin hole 205 of the differential housing, as shown. Figure 5 As shown, the above structure enables the machining of the slotted hole 206 and the locking pin hole 205 to be completed in one clamping, eliminating the cumulative positioning error caused by multiple clamping, ensuring the relative positional accuracy between the hole system, improving machining efficiency, and enhancing the consistency and stability of product quality.

[0022] like Figure 3 and Figures 6-8 As shown, the clamping assembly includes a plurality of first fixing cylinders 10 fixedly connected to the bottom end of the clamp base plate 3. Each of the plurality of first fixing cylinders 10 is provided with a second fastening cylinder 11 at its bottom end. The bottom end of the second fastening cylinder 11 is fixedly connected to a base plate 12. The bottom end of the base plate 12 is provided with a plurality of threaded holes corresponding to the second fastening cylinder 11. The first fixing cylinders 10 and the second fastening cylinders 11 are fixedly connected by fastening screws.

[0023] The bottom end of the base plate 12 is provided with a second tool avoidance hole 13, which is used to avoid the passage of the drill rod when machining the locking pin hole 205. The bottom end of the base plate 12 is also provided with a rectangular through hole 14, and a threaded hole 15 is provided on the side wall of the rectangular through hole 14. A fastening screw is provided in the threaded hole 15.

[0024] A through hole 16 is provided in the middle of the base plate 12. A locking rod 17 is provided on the inner wall of the through hole 16. The locking rod 17 is fixedly connected to the base plate 12 through a fastening screw in the threaded hole 15. A clamping nut 18 is threadedly connected to the outer wall of the locking rod 17.

[0025] A clamping ring 19 is slidably connected to the outer end of the locking rod 17. The top end of the clamping ring 19 abuts against the clamping nut 18, and the bottom end of the clamping ring 19 abuts against the end face of the bushing 204. By rotating the clamping nut 18, the clamping force of the clamping ring 19 on the bushing 204 can be adjusted to achieve reliable clamping of the differential housing.

[0026] like Figure 9 and Figure 10 As shown, the bottom end of the fixture base plate 3 is fixedly connected to the connecting plate 20 by fastening screws. The outer end of the connecting plate 20 is fixedly connected to the U-shaped guide sleeve 21. The U-shaped guide sleeve 21 has a concave structure and is used to guide the drill rod. When the drill rod deviates due to cutting force or other factors, it will be constrained when it approaches the concave wall.

[0027] like Figure 11As shown, two symmetrically arranged positioning blocks 22 are fixedly connected to the top of the base plate 12. Positioning pins 23 that penetrate the positioning blocks 22 are fixedly connected to the ends of the positioning blocks 22. Both positioning pins 23 abut against the end face of the half shaft hole 202. Through the contact between the two positioning pins 23 and the end face of the half shaft hole 202, it is ensured that the axis of the slotted hole 206 is parallel to the end face of the half shaft hole 202, preventing the slotted hole 206 from being skewed due to the workpiece position shift during clamping, thereby ensuring the positional accuracy and perpendicularity requirements of the slotted hole 206.

[0028] like Figures 1-11 As shown, during clamping, first, the differential housing is placed into the positioning hole 4, and the position of the differential housing is adjusted so that the end face of the half shaft hole 202 is tightly abutted against the two positioning pins 23 to establish a positioning reference; then, the outer wall of the bell-shaped cover 201 is made to fit against the inner wall of the positioning ring 5, and the flange 203 naturally falls on the pad 6 to complete the radial and axial positioning; finally, the clamping nut 18 is adjusted so that the clamping ring 19 presses against the bushing 204 to complete reliable clamping.

[0029] When machining a 206 slotted hole, if Figure 4 As shown, the rotary table 1 drives the fixture to rotate 90 degrees. The CNC machine tool drives the drill rod to process one of the slotted holes 206 through the fan-shaped countersunk hole 8 and the first avoidance hole 9. After the machining is completed, the rotary table 1 drives the fixture to continue rotating 180 degrees to process the other slotted hole 206. After the slotted hole 206 is completed, the rotary table 1 drives the fixture back to the starting position. Figure 1 The initial position is shown. Then, the rotary table 1 rotates the fixture 180 degrees again. The CNC machine tool drives the drill rod to machine the locking pin hole 205 of the differential housing through the second avoidance hole 13. Figure 5 As shown, the U-shaped guide sleeve 21 ensures the guiding accuracy of the drill rod. Throughout the entire machining process, the differential housing remains fixedly connected to the fixture and rotates precisely with the rotary table 1, ensuring the relative positional accuracy between the holes.

[0030] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A differential housing drilling fixture, comprising a rotary table (1) and a differential housing, wherein the differential housing includes a bell-shaped cover (201), the outer end of the bell-shaped cover (201) having a through-hole (202) for the half-shaft, the top end of the bell-shaped cover (201) being fixedly connected to a flange (203), the top end of the flange (203) being fixedly connected to a bushing (204), the outer end of the flange (203) having a locking pin hole (205), and the outer end of the bell-shaped cover (201) having a slotted hole (206), characterized in that: It also includes a fixture mounted on the rotary table, the fixture comprising a positioning component and a clamping component; The positioning assembly includes a fixture base plate (3) fixedly connected to the rotary table (1). A positioning hole (4) is provided in the middle of the fixture base plate (3). A positioning ring (5) is fixedly connected to the top of the fixture base plate (3). The inner wall of the positioning ring (5) abuts against the outer wall of the bell-shaped cover (201). A plurality of pads (6) evenly distributed along the circumference of the positioning ring (5) are fixedly connected to the top of the fixture base plate (3). The top of the pads (6) abuts against the flange (203). A transition chamfer (7) is provided on the inner ring of the plurality of pads (6). A symmetrically arranged fan-shaped countersunk hole (8) is provided at the outer end of the fixture base plate (3). A first knife-avoiding hole (9) is provided at the bottom end of the fan-shaped countersunk hole (8). The axis of the first knife-avoiding hole (9) intersects perpendicularly with the axis of the positioning hole (4) in the same plane.

2. A differential case punching tool as in claim 1, wherein: The clamping assembly includes a plurality of first fixing cylinders (10) fixedly connected to the bottom end of the clamp base plate (3). The bottom end of each of the plurality of first fixing cylinders (10) is provided with a second fastening cylinder (11). The bottom end of the second fastening cylinder (11) is fixedly connected to a base plate (12). The bottom end of the base plate (12) is provided with a plurality of threaded holes corresponding to the second fastening cylinder (11). The first fixing cylinder (10) and the second fastening cylinder (11) are fixedly connected by fastening screws.

3. A differential case piercing tool as in claim 2, wherein: The bottom end of the base plate (12) is provided with a second knife-avoiding hole (13), and the bottom end of the base plate (12) is also provided with a rectangular through hole (14). The side wall of the rectangular through hole (14) is provided with a threaded hole (15), and a fastening screw is provided in the threaded hole (15). The middle part of the base plate (12) is provided with a through hole (16).

4. A differential case piercing tool as in claim 3, wherein: The inner wall of the through hole (16) is provided with a locking rod (17). The locking rod (17) is fixedly connected to the base plate (12) through a fastening screw in the threaded hole (15). The outer wall of the locking rod (17) is threaded with a clamping nut (18). The outer end of the locking rod (17) is slidably connected with a clamping ring (19). The top end of the clamping ring (19) abuts against the clamping nut (18), and the bottom end of the clamping ring (19) abuts against the end face of the bushing (204).

5. A differential case piercing tool as in claim 1, wherein: The bottom end of the fixture base plate (3) is fixedly connected to a connecting plate (20) by fastening screws, and the outer end of the connecting plate (20) is fixedly connected to a U-shaped guide sleeve (21).

6. A differential case piercing tool as in claim 2, wherein: The top of the base plate (12) is fixedly connected to two symmetrically arranged positioning blocks (22), and the end of the positioning block (22) is fixedly connected to a positioning pin (23) that passes through the positioning block (22). Both positioning pins (23) abut against the end face of the half shaft hole (202).

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