A positioning fixture for steering gear housing machining

Abstract

The utility model relates to a kind of positioning clamps for steering gear housing machining, belong to steering gear housing clamp technical field.It includes four axle bridge board, transition plate and compression assembly, four axle bridge board is fixed with transition plate by wedge key and inner hexagon screw, detachable mounting has compression assembly on the four axle bridge board of transition plate side, transition plate is misaligned with cylindrical positioning pin and rhombus positioning pin, cylindrical positioning pin and rhombus positioning pin are correspondingly set with the process reference hole of steering gear housing, four axle bridge board and transition plate are respectively provided with the through hole corresponding with the mounting foot screw hole of steering gear housing mouth part, bushing is sleeved on the through hole of transition plate, the positioning clamp has quick clamping function, can realize steering gear housing 17 accurate positioning, simultaneously have mistake-proof function.

Description

Technical Field

[0001] This utility model relates to a positioning fixture for machining steering gear housings, belonging to the technical field of steering gear housing fixtures. Background Technology

[0002] The steering gear housing is a crucial component of automotive power steering systems, typically comprising mounting surfaces, main bores, transverse bores, bearing bores, oil seal bores, and multiple connecting bolt holes. These features have stringent dimensional accuracy and positional tolerance requirements (such as coaxiality, parallelism, and center distance between bores). In actual production, a four-axis rotary table in conjunction with positioning fixtures is usually used to machine the steering gear housing.

[0003] The existing positioning fixture requires tightening a large number of bolts when locking the steering gear housing, which is time-consuming and labor-intensive, seriously affecting the normal production cycle and causing difficulties in disassembling and assembling the steering gear housing. On the other hand, the existing positioning fixture does not have error prevention function, and operators are very likely to mistakenly install the steering gear housing, affecting the normal processing of the steering gear housing. Therefore, it is necessary to improve it. Summary of the Invention

[0004] The purpose of this utility model is to provide a positioning fixture for machining steering gear housings that has a quick clamping function, can accurately position the steering gear housing, and has an error prevention function.

[0005] The technical solution of this utility model is: A positioning fixture for machining a steering gear housing includes a four-axis bridge plate, a transition plate, and a clamping assembly. The transition plate is fixed to the four-axis bridge plate via wedge keys and hexagonal socket screws. A clamping assembly is detachably mounted on one side of the four-axis bridge plate. Cylindrical and rhomboid locating pins are staggered on the transition plate, corresponding to the process reference holes in the steering gear housing. Through holes corresponding to the threaded holes of the mounting feet at the opening of the steering gear housing are provided on both the four-axis bridge plate and the transition plate. Bushings are fitted onto the through holes of the transition plate.

[0006] The four-axis bridge plate is a rectangular plate, and multiple cylindrical countersunk holes are provided at both ends of the four-axis bridge plate.

[0007] The top of both the cylindrical locating pin and the rhomboid locating pin is provided with a large chamfer or a conical surface, and the circumference of the cylindrical locating pin and the rhomboid locating pin is provided with a flange.

[0008] The four-axis bridge plate and the transition plate are respectively provided with wedge grooves on their corresponding surfaces, and the wedge grooves are distributed in a "ㅓ" shape.

[0009] The transition plate is provided with a clearance groove.

[0010] The clamping assembly includes an upper pull plate, a lower pull plate, a threaded rod, a top rod, and a pressure plate. The upper pull plate and the lower pull plate are both long strips. The upper pull plate is located on the upper surface of the four-axis bridge plate, and the lower pull plate is located on the lower surface of the four-axis bridge plate. The two ends of the upper pull plate and the lower pull plate are fixed by symmetrically arranged locking bolts. A threaded rod is fixedly mounted on the upper pull plate. A top rod is detachably mounted on the upper pull plate on one side of the threaded rod. A pressure plate is pressed onto the threaded rod by a locking nut and the top rod.

[0011] The pressure plate is a plate-shaped body with an elongated hole, which is used to insert a threaded rod.

[0012] The advantages of this utility model compared with the prior art are as follows: This positioning fixture for machining the steering gear housing achieves initial positioning of the steering gear housing by aligning cylindrical and diamond-shaped locating pins with the process reference holes on the housing. The asymmetrical arrangement of these pins ensures that the steering gear housing has only one correct installation position and orientation, effectively preventing incorrect installation by operators. Locking screws, passing through the holes in the four-axis bridge plate, transition plate, and bushing, engage with the threaded holes at the mounting feet of the steering gear housing, ensuring that the process reference holes on the steering gear housing align with the cylindrical and diamond-shaped locating pins. The boss fits perfectly, eliminating the gap between them and locking the steering gear housing on the four-axle bridge plate and the transition plate. Through the long oval hole of the pressure plate and the threaded rod, one end of the pressure plate corresponds to the rear blank surface of the steering gear housing, and the other end corresponds to the push rod. Under the limiting action of the locking nut, the pressure plate presses against the rear blank surface of the steering gear housing, thus completing the positioning and clamping operation of the positioning fixture on the steering gear housing. This positioning fixture has a quick clamping function, which can realize the accurate positioning of the steering gear housing, and also has an error prevention function. Attached Figure Description

[0013] Figure 1 This is a top view of the structure of this utility model; Figure 2 This is a front view schematic diagram of the structure of the steering gear housing clamping device of this utility model; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0014] In the diagram: 1. Four-axis bridge plate; 2. Transition plate; 3. Countersunk cylindrical hole; 4. Wedge key; 5. Socket head screw; 6. Pull-up plate; 7. Pull-down plate; 8. Threaded rod; 9. Push rod; 10. Pressure plate; 11. Oblong hole; 12. Flange; 13. Locking screw; 14. Relief groove; 15. Stud; 16. Fixed threaded cylinder; 17. Steering gear housing; 18. Cylindrical locating pin; 19. Diamond locating pin; 20. Bushing; 21. Locking nut. Detailed Implementation

[0015] As attached Figure 1-3 As shown The positioning fixture for machining the steering gear housing includes a four-axis bridge plate 1, a transition plate 2, and a clamping assembly. The four-axis bridge plate 1 is a rectangular plate, and multiple cylindrical countersunk holes 3 are provided at both ends of the four-axis bridge plate 1. In use, the four-axis bridge plate 1 can be fixedly installed on the four-axis turntable by means of the cylindrical countersunk holes 3 and screws, so that the steering gear housing 17 can be machined in the future.

[0016] A transition plate 2 is fixedly mounted on the four-axis bridge plate 1 by a wedge key 4 and an internal hex screw 5. The four-axis bridge plate 1 is provided with a threaded hole for installing the internal hex screw 5. The transition plate 2 is provided with a through countersunk hole corresponding to the threaded hole. In use, the internal hex screw 5 passes through the through countersunk hole of the transition plate 2 and is threadedly connected to the threaded hole of the four-axis bridge plate 1 to achieve locking between the four-axis bridge plate 1 and the transition plate 2.

[0017] The four-axis bridge plate 1 and the transition plate 2 are respectively provided with wedge grooves on their corresponding surfaces. The cross-section of the wedge grooves is rectangular. The wedge grooves are distributed in a "ㅓ" shape between the four-axis bridge plate 1 and the transition plate 2. A wedge key 4 is provided in the wedge groove. When in use, a pre-tightening force can be generated when the four-axis bridge plate 1 and the transition plate 2 are locked together by the wedge key 4, which further ensures the stability of the locking of the four-axis bridge plate 1 and the transition plate 2.

[0018] A clamping assembly is detachably installed on the four-axis bridge plate 1 on one side of the transition plate 2. The clamping assembly includes an upper pull plate 6, a lower pull plate 7, a threaded rod 8, a top rod 9, and a pressure plate 10. The upper pull plate 6 and the lower pull plate 7 are both long strips. The upper pull plate 6 is located on the upper surface of the four-axis bridge plate 1, and the lower pull plate 7 is located on the lower surface of the four-axis bridge plate 1. The two ends of the upper pull plate 6 and the lower pull plate 7 are fixed by symmetrically arranged locking bolts. In use, the upper pull plate 6 and the lower pull plate 7 are locked on the four-axis bridge plate 1 by the action of the locking bolts.

[0019] A threaded rod 8 is fixedly installed on the upper pull plate 6. A pressure plate 10 is pressed onto the pull rod via a locking nut 21 and a push rod 9. The pressure plate 10 is plate-shaped and has an elongated hole 11. The elongated hole 11 is inserted into the threaded rod 8. A locking nut 21 is threaded onto the threaded rod 8 above the pressure plate 10. A push rod 9 is detachably installed on the upper pull plate 6 on one side of the threaded rod 8. The purpose of detachable installation of the push rod 9 is to facilitate the replacement of push rods 9 of different lengths to adapt to different models of steering gear housings 17 for clamping operations. The push rod 9 is a long round rod with a stud 15 at its bottom end. A fixed threaded cylinder 16 is fixedly installed on the upper pull plate 6 corresponding to the stud 15. The stud 15 of the push rod 9 and the fixed threaded cylinder 16 are threadedly connected. One end of the push rod 9 is in contact with the pressure plate 10. When in use, after the push rod 9 contacts the pressure plate 10, it generates a lifting force on one end of the pressure plate 10. The pressure plate 10 is limited by the locking nut 21. Under the elasticity of the pressure plate 10 itself, the other end of the pressure plate 10 generates a downward pressure to press the steering gear housing 17.

[0020] Cylindrical locating pins 18 and rhomboid locating pins 19 are fixedly installed on the transition plate 2 in a staggered manner. The top of both cylindrical locating pins 18 and rhomboid locating pins 19 is provided with a large chamfer or a conical surface. In use, the large chamfer or conical surface facilitates the introduction of the process reference hole of the steering gear housing 17. The cylindrical locating pins 18 and rhomboid locating pins 19 are used for the initial positioning of the steering gear housing 17.

[0021] The cylindrical locating pin 18 and the rhomboid locating pin 19 are provided with flanges 12 on their circumference. When in use, the purpose of the flanges 12 is to support the bottom of the steering gear housing 17 so that the distance between the bottom of the steering gear housing 17 and the upper surface of the transition plate 2 remains consistent.

[0022] The cylindrical locating pin 18 and the diamond locating pin 19 are set to correspond to the process reference holes of the steering gear housing 17. When in use, the cylindrical locating pin 18 and the diamond locating pin 19 play a role in preventing errors and avoiding incorrect installation of the steering gear housing 17 on the transition plate 2.

[0023] The four-axle bridge plate 1 and the transition plate 2 are respectively provided with through holes corresponding to the threaded holes of the mounting feet at the opening of the steering gear housing 17. Locking screws 13 can be inserted into these through holes. A bushing 20 is fitted on the through hole of the transition plate 2. In use, the locking screw 13 passes through the through hole of the four-axle bridge plate 1 and the bushing 20 on the through hole of the transition plate 2 and engages with the threaded holes of the mounting feet at the opening of the steering gear housing 17 to achieve locking of the steering gear housing 17 on the four-axle bridge plate 1 and the transition plate 2.

[0024] The transition plate 2 is provided with a clearance groove 14, which is used to make way for the steering gear housing 17, so as to facilitate the installation of the steering gear housing 17 on the transition plate 2.

[0025] When using the positioning fixture for machining the steering gear housing, the worker first hoists the steering gear housing 17 to the top of the positioning fixture, then aligns the process reference hole of the steering gear housing 17 with the cylindrical positioning pin 18 and the diamond positioning pin 19 respectively. After the alignment is completed, the steering gear housing 17 is lowered so that the steering gear housing 17 falls on the support surface of the bushing 20 on the transition plate 2 by its own weight, thereby completing the initial positioning of the steering gear housing 17.

[0026] Next, the locking screw 13 is threaded through the holes of the four-axis bridge plate 1, transition plate 2, and bushing 20 and into the threaded hole of the mounting foot at the opening of the steering gear housing 17. The locking screw 13 tightens the steering gear housing 17, so that the process reference hole of the steering gear housing 17 is completely fitted with the boss of the cylindrical positioning pin 18 and the diamond positioning pin 19, eliminating the gap between them. Finally, the elongated hole 11 of the pressure plate 10 is fitted onto the threaded rod 8. One end of the pressure plate 10 corresponds to the rear blank surface of the steering gear housing 17, and the other end of the pressure plate 10 corresponds to the top rod 9. Then, the locking nut 21 is threaded into the threaded rod 8, and the locking nut 21 limits the pressure plate 10, thereby pressing one end of the pressure plate 10 against the rear blank surface of the steering gear housing 17. This completes the positioning and clamping operation of the positioning fixture on the steering gear housing 17. The positioning fixture has a quick clamping function, can accurately position the steering gear housing 17, and also has an error prevention function.

Claims

1. A positioning fixture for steering gear housing machining, comprising a four-axis bridge plate (1), a transition plate (2) and a pressing assembly, characterized in that: A transition plate (2) is fixed on the four-axis bridge plate (1) by a wedge key (4) and an internal hex screw (5). A clamping assembly is detachably installed on the four-axis bridge plate (1) on one side of the transition plate (2). A cylindrical locating pin (18) and a diamond locating pin (19) are staggered on the transition plate (2). The cylindrical locating pin (18) and the diamond locating pin (19) are set in correspondence with the process reference hole of the steering gear housing (17). The four-axis bridge plate (1) and the transition plate (2) are respectively provided with through holes corresponding to the threaded holes of the mounting feet at the opening of the steering gear housing (17). A bushing (20) is fitted on the through hole of the transition plate (2).

2. A positioning fixture for steering gear housing machining according to claim 1, characterized in that: The four-axis bridge plate (1) is a rectangular plate, and multiple cylindrical countersunk holes (3) are provided at both ends of the four-axis bridge plate (1).

3. A positioning fixture for steering gear housing machining according to claim 1, characterized in that: The top of both the cylindrical locating pin (18) and the rhomboid locating pin (19) is provided with a large chamfer or a conical surface, and the cylindrical locating pin (18) and the rhomboid locating pin (19) are provided with a flange (12) on their circumference.

4. A positioning fixture for machining a steering gear housing according to claim 1, characterized in that: The four-axis bridge plate (1) and the transition plate (2) are respectively provided with wedge grooves on their corresponding surfaces, and the wedge grooves are distributed in a "ㅓ" shape.

5. The positioning fixture for steering gear housing machining according to claim 1, characterized in that: The transition plate (2) is provided with a clearance groove (14).

6. A positioning fixture for steering gear housing machining according to claim 1, characterized in that: The clamping assembly includes an upper pull plate (6), a lower pull plate (7), a threaded rod (8), a top rod (9), and a pressure plate (10). The upper pull plate (6) and the lower pull plate (7) are long strips. The upper pull plate (6) is located on the upper surface of the four-axis bridge plate (1), and the lower pull plate (7) is located on the lower surface of the four-axis bridge plate (1). The upper pull plate (6) and the lower pull plate (7) are fixed at both ends by symmetrically arranged locking bolts. The threaded rod (8) is fixed on the upper pull plate (6). The top rod (9) is detachably installed on the upper pull plate (6) on one side of the threaded rod (8). The pressure plate (10) is pressed onto the threaded rod (8) by a locking nut (21) and the top rod (9).

7. A positioning fixture for steering gear housing machining according to claim 6, characterized in that: The pressure plate (10) is a plate-shaped body, and an elongated hole (11) is provided on the pressure plate (10). The elongated hole (11) is inserted into the threaded rod (8).

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