Electric vehicle differential housing drilling jig
By using the locating shaft and the conical surface of the frustum for engagement, combined with the clamping unit and the fixture design of the detachable expansion block, the problem of difficult positioning of the differential housing was solved, achieving high-precision drilling and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINAN QIAOBOSHI AUTO PARTS CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-07
AI Technical Summary
Existing differential housing clamps are difficult to position stably, affecting drilling accuracy, and the dedicated clamping structure increases manufacturing costs and production changeover complexity.
A fixture comprising a positioning shaft, a frustum, and a clamping unit is designed. The positioning shaft and the frustum are engaged by tapered surfaces, and the clamping unit's lower pressure block gradually squeezes the shaft hole to achieve fixation. Combined with a detachable extension block, it can adapt to different inner diameters, achieving stable positioning and drilling of the differential housing.
It improves drilling position accuracy, reduces manufacturing costs, simplifies production changeover complexity, and adapts to the fixed requirements of different differential housings.
Smart Images
Figure CN224463754U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of differential housing drilling fixture technology, specifically a drilling fixture for electric vehicle differential housing. Background Technology
[0002] The differential housing is a critical component in the electric vehicle's drivetrain. It features a flange, which typically requires drilling holes to install bolts, ensuring reliable fastening to the drive shaft or other components. When machining the bolt holes on the flange, a fixture must be used to stably clamp the differential housing to guarantee the drilling accuracy and machining quality.
[0003] Currently, differential housing clamps are typically held on the unmachined outer contour of the housing, such as reinforcing ribs, cast bosses, or flange edges. However, because the structural design of differential housings usually aims for lightweighting and strength optimization, their outer contours are often irregular, and the clamping surface is small, making positioning difficult and hindering stable positioning, which affects the positional accuracy of drilling. If clamped on the edge of the flange, it will affect the drilling operation.
[0004] Furthermore, existing fixtures typically require the design of dedicated clamping structures for specific housings, which increases manufacturing costs and the complexity of production changeovers. Utility Model Content
[0005] To address the technical problems mentioned above, this utility model provides a drilling fixture for electric vehicle differential housings.
[0006] The technical solution of this utility model is as follows:
[0007] A drilling fixture for an electric vehicle differential housing includes a base, a positioning shaft on the base along the vertical direction, a truncated cone coaxial with the positioning shaft, and the truncated cone connected to the positioning shaft by a connector. The maximum outer diameter of the truncated cone is smaller than the inner diameter of the shaft hole of the differential housing.
[0008] The positioning shaft is also equipped with a clamping unit, which includes an adjusting sleeve and at least two symmetrically arranged lower pressure blocks. The adjusting sleeve is threaded to the upper part of the positioning shaft. The upper part of the lower pressure block is equipped with a lower pressure rod. The upper part of the lower pressure rod slides with the positioning shaft, and the lower end face of the adjusting sleeve can press down to the upper part of the lower pressure rod. The side of the lower pressure block near the frustum is adapted to the conical surface of the frustum, and the outer side of the lower pressure block is an arc-shaped surface adapted to the inner wall of the shaft hole.
[0009] Furthermore, the pressure rod is an L-shaped rod, and the upper part of both L-shaped rods is provided with an annular part sleeved on the positioning shaft, with the two annular parts arranged vertically.
[0010] The positioning shaft has the following structure: the upper part of the positioning shaft is provided with a first threaded section, the inner wall of the adjusting sleeve is provided with a second threaded section that is adapted to the first threaded section, and the inner diameter of the annular part is larger than the maximum outer diameter of the first threaded section and smaller than the outer diameter of the adjusting sleeve, so as to facilitate the sliding of the annular part in the axial position of the positioning shaft.
[0011] To accommodate cases where the inner diameter of the differential housing's shaft hole is large, symmetrical slots with openings are provided on the outer side of the frustum. An extension block is detachably connected to the slot. The side of the extension block closest to the slot is adapted to the slot, and the outer side of the extension block is adapted to the inner side of the pressure block. The thickness of the extension block is greater than the depth of the slot. By installing the extension block and cooperating with the pressure block, differential housing shaft holes of different inner diameters can be fixed, thereby fixing the differential housing and facilitating drilling operations on the differential housing flange.
[0012] The expansion block and the slot are connected by a structure in which the slot has a first threaded hole and the expansion block has a countersunk threaded hole that matches the first threaded hole. The expansion block is connected to the slot by a countersunk bolt. The countersunk threaded hole does not protrude outward from the outer side of the expansion block and will not affect the contact between the expansion block and the lower pressure block.
[0013] The structure of the countersunk threaded hole is as follows: the countersunk threaded hole includes a countersunk hole and a second threaded hole connected to it, and the nut of the countersunk bolt is located inside the countersunk hole.
[0014] To facilitate tightening or loosening of the adjusting sleeve, and to enable the two lower pressure blocks to press down synchronously through the adjusting sleeve, which in turn clamps them in the shaft hole to fix the position of the differential housing, an adjusting handle is provided on the outside of the adjusting sleeve.
[0015] To facilitate the collection of drilling waste and cutting fluid during drilling, the base is equipped with a waste collection trough coaxial with the positioning shaft. The cross-section of the waste collection trough is arc-shaped, which can be located below the flange to be drilled, reducing the splashing of waste and cutting fluid to the outside of the base and reducing the phenomenon of being difficult to clean.
[0016] To ensure that the pressure block can still fit against the outer surface of the frustum when the expansion block is not used, the width of the pressure block in the circumferential direction is greater than the width of the slot in the circumferential direction.
[0017] The beneficial effects of this utility model are as follows:
[0018] The positioning shaft and its truncated cone can be directly placed in the shaft hole of the differential housing to be drilled. The side of the truncated cone is tapered, and the outer diameter of the tapered surface increases from top to bottom. The positioning shaft is equipped with a clamping unit. The lower pressure block of the clamping unit can move downward along the tapered surface of the truncated cone under the drive of the adjusting sleeve, so that the outer side of the lower pressure block is gradually squeezed against the inner wall of the shaft hole, fixing the position of the adjusting sleeve, thereby fixing the position of the differential housing and fixing the position of the flange of the differential housing. This makes it easier to drill the flange through drilling equipment. By fixing it inside the shaft hole of the differential housing, compared with the irregular surface and small contact surface on the outside of the differential housing, the stable positioning of the electric vehicle differential housing can be achieved, improving the positional accuracy of drilling.
[0019] It can also fix various differential housings without the need to design special clamping structures, reducing manufacturing costs and simplifying production changeover. Attached Figure Description
[0020] In the attached diagram:
[0021] Figure 1 This is a structural diagram;
[0022] Figure 2 This is a top view;
[0023] Figure 3 for Figure 2 A schematic diagram of the AA-direction cross-section structure;
[0024] Figure 4 This is a structural schematic diagram of the positioning shaft and the clamping unit;
[0025] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;
[0026] Figure 6 This is a schematic diagram of the structure of the frustum without the expansion blocks installed.
[0027] Figure 7 A schematic diagram of a structure for installing an expansion block on a frustum;
[0028] The components represented by the various reference numerals in the diagram are:
[0029] 1. Base; 101. Waste collection trough; 2. Positioning shaft; 201. First threaded section; 3. Frustum; 301. Slot; 302. First threaded hole; 4. Connector; 5. Lower pressure block; 6. Adjusting sleeve; 601. Second threaded section; 7. Lower pressure rod; 701. Ring part; 8. Extension block; 801. Countersunk threaded hole; 9. Adjusting handle; 10. Differential housing; 1001. Shaft hole; 1002. Flange; 11. Countersunk bolt. Detailed Implementation
[0030] Example 1
[0031] See Figure 1 , Figure 2 and Figure 3 As shown, a drilling fixture for an electric vehicle differential housing includes a base 1. A positioning shaft 2 is provided on the base 1 along the vertical direction. A frustum 3, coaxial with the positioning shaft 2, is fitted onto the positioning shaft 2. A through hole adapted to the positioning shaft 2 is opened in the middle of the frustum 3 along its axial direction. The position of the frustum 3 can be adjusted on the positioning shaft 2. The frustum 3 is connected to the positioning shaft 2 through a connector 4. The maximum outer diameter of the frustum 3 is smaller than the inner diameter of the shaft hole 1001 of the differential housing 10. The connector 4 can be a fastening bolt. The connector 4 passes through the frustum 3 and is tightened to the outer side of the positioning shaft 2 to fix the frustum 3. The connector 4 can also pass through the frustum 3 and the positioning shaft 2 to fix the frustum 3.
[0032] See Figure 4 , Figure 5 and Figure 6 As shown, the positioning shaft 2 is also provided with a clamping unit, which includes an adjusting sleeve 6 and at least two symmetrically arranged lower pressing blocks 5. The adjusting sleeve 6 is threadedly connected to the upper part of the positioning shaft 2. The upper part of the lower pressing block 5 is provided with a lower pressing rod 7. The upper part of the lower pressing rod 7 is slidably connected to the positioning shaft 2, and the lower end face of the adjusting sleeve 6 can press down to the upper part of the lower pressing rod 7. The side of the lower pressing block 5 near the frustum 3 is adapted to the conical surface of the frustum 3, and the outer side of the lower pressing block 5 is an arc-shaped surface adapted to the inner wall of the shaft hole 1001.
[0033] To facilitate tightening or loosening of the adjusting sleeve 6, and to enable the two pressing blocks 5 to press down synchronously through the adjusting sleeve 6, and to cooperate with the frustum 3 to clamp in the shaft hole 1001, thereby fixing the position of the differential housing 10, an adjusting handle 9 is provided on the outside of the adjusting sleeve 6.
[0034] The lowering rod 7 is an L-shaped rod, and the upper part of both L-shaped rods is provided with annular parts 701 sleeved on the positioning shaft 2. In order to facilitate the simultaneous pressing of the two annular parts 701 by adjusting the sleeve 6, and then pressing the lowering block 5 downward, so that the lowering block 5 cooperates with the frustum 3 to be fastened in the shaft hole 1001, thereby fixing the position of the differential housing 10, the upper end of one L-shaped rod is higher than the upper end of the other L-shaped rod, so that the two annular parts 701 are arranged vertically.
[0035] See Figure 3 and Figure 4As shown, the upper part of the positioning shaft 2 is provided with a first threaded section 201, and the inner wall of the adjusting sleeve 6 is provided with a second threaded section 601 that is adapted to the first threaded section 201. The inner diameter of the annular part 701 is greater than the maximum outer diameter of the first threaded section 201, and the inner diameter of the annular part 701 is smaller than the outer diameter of the adjusting sleeve 6, so that the annular part 701 can slide in the axial position of the positioning shaft 2. The outer diameter of the annular part 701 is greater than the inner diameter of the adjusting sleeve 6, so that the two annular parts 701 can move down when the adjusting sleeve 6 is pressed down.
[0036] In this embodiment, in order to facilitate the collection of drilling waste and cutting fluid during drilling, a waste collection trough 101 coaxial with the positioning shaft 2 is provided on the base 1. The cross-section of the waste collection trough 101 is an arc-shaped surface, which facilitates the cleaning of waste and cutting fluid.
[0037] The positioning shaft 2 and the truncated cone 3 on it can be directly placed in the shaft hole 1001 of the differential housing 10 to be drilled. The side of the truncated cone 3 is a tapered surface, and the outer diameter of the tapered surface increases from top to bottom. A clamping unit is set on the positioning shaft 2. The lower pressure block 5 of the clamping unit can move downward along the tapered surface of the truncated cone 3 under the drive of the adjusting sleeve 6, so that the outer side of the lower pressure block 5 is gradually squeezed against the inner wall of the shaft hole 1001, fixing the position of the adjusting sleeve 6, thereby fixing the position of the differential housing 10 and fixing the position of the flange 1002 of the differential housing 10.
[0038] Example 2:
[0039] See Figure 7 As shown, the difference between Embodiment 2 and Embodiment 1 is that an extension block 8 can be installed on the frustum 3 in Embodiment 2 to accommodate cases where the inner diameter of the shaft hole 1001 of the differential housing 10 is large. Specifically, the frustum 3 has symmetrically opened slots 301 on its outer side. An extension block 8 is detachably connected to the slot 301. The side of the extension block 8 near the slot 301 is adapted to the slot 301, and the outer side of the extension block 8 is adapted to the inner side of the pressure block 5. The thickness of the extension block 8 is greater than the depth of the slot 301. By installing the extension block 8 and cooperating with the pressure block 5, the shaft hole 1001 of the differential housing 10 with different inner diameters can be fixed, thereby fixing the differential housing 10 and facilitating the drilling operation of the flange 1002 of the differential housing 10.
[0040] To ensure that the pressing block 5 can still fit against the outer surface of the frustum 3 when the expansion block 8 is not used, the width of the pressing block 5 in the circumferential direction is greater than the width of the slot 301 in its circumferential direction.
[0041] The expansion block 8 and the slot 301 are connected in the following way: the slot 301 has a first threaded hole 302, and the expansion block 8 has a countersunk threaded hole 801 that matches the first threaded hole 302. The expansion block 8 is connected to the slot 301 by a countersunk bolt 11. The countersunk threaded hole 801 does not protrude outward from the outer side of the expansion block 8 and will not affect the contact between the expansion block 8 and the lower pressure block 5. The countersunk threaded hole 801 includes a countersunk hole and a second threaded hole communicating with it. The nut of the countersunk bolt 11 is located inside the countersunk hole.
Claims
1. A drilling fixture for an electric vehicle differential housing, comprising a base (1), characterized in that, The base (1) is provided with a positioning shaft (2) in the vertical direction. A frustum (3) coaxial with the positioning shaft (2) is sleeved on the positioning shaft (2). The frustum (3) is connected to the positioning shaft (2) through a connector (4). The maximum outer diameter of the frustum (3) is smaller than the inner diameter of the shaft hole (1001) of the differential housing (10). The positioning shaft (2) is also provided with a clamping unit, which includes an adjusting sleeve (6) and at least two symmetrically arranged lower pressing blocks (5). The adjusting sleeve (6) is threadedly connected to the upper part of the positioning shaft (2). The upper part of the lower pressing block (5) is provided with a lower pressing rod (7). The upper part of the lower pressing rod (7) is slidably connected to the positioning shaft (2), and the lower end face of the adjusting sleeve (6) can press down to the upper part of the lower pressing rod (7). The side of the lower pressing block (5) near the frustum (3) is adapted to the conical surface of the frustum (3), and the outer side of the lower pressing block (5) is an arc-shaped surface adapted to the inner wall of the shaft hole (1001).
2. The electric vehicle differential housing drilling fixture according to claim 1, characterized in that, The pressing rod (7) is an L-shaped rod, and the upper part of the two L-shaped rods is provided with an annular part (701) sleeved on the positioning shaft (2), and the two annular parts (701) are arranged vertically.
3. The electric vehicle differential housing drilling fixture according to claim 1, characterized in that, The upper part of the positioning shaft (2) is provided with a first thread section (201), and the inner wall of the adjusting sleeve (6) is provided with a second thread section (601) that is adapted to the first thread section (201). The inner diameter of the ring (701) is greater than the maximum outer diameter of the first thread section (201) and smaller than the outer diameter of the adjusting sleeve (6).
4. The electric vehicle differential housing drilling fixture according to claim 1, characterized in that, The outer side of the truncated cone (3) is symmetrically provided with slots (301) with openings. An expansion block (8) is detachably connected to the slot (301). The side of the expansion block (8) close to the slot (301) is adapted to the slot (301). The outer side of the expansion block (8) is adapted to the inner side of the pressing block (5). The thickness of the expansion block (8) is greater than the depth of the slot (301).
5. A drilling fixture for an electric vehicle differential housing according to claim 4, characterized in that, The slot (301) has a first threaded hole (302), and the expansion block (8) has a countersunk threaded hole (801) that matches the first threaded hole (302). The expansion block (8) is connected to the slot (301) by a countersunk bolt (11).
6. A drilling fixture for an electric vehicle differential housing according to claim 5, characterized in that, The countersunk threaded hole (801) includes a countersunk hole and a second threaded hole communicating with it, and the nut of the countersunk bolt (11) is located in the countersunk hole.
7. A drilling fixture for an electric vehicle differential housing according to claim 1, characterized in that, An adjustment handle (9) is provided on the outside of the adjusting sleeve (6).
8. A drilling fixture for an electric vehicle differential housing according to claim 1, characterized in that, The base (1) is provided with a waste collection trough (101) coaxial with the positioning shaft (2), and the cross section of the waste collection trough (101) is an arc surface.
9. A drilling fixture for an electric vehicle differential housing according to claim 4, characterized in that, The width of the pressing block (5) in the circumferential direction is greater than the width of the slot (301) in its circumferential direction.