Detection fixing tool for mandrel assembly of electric power steering gear

Abstract

The utility model relates to a detection fixing tool, in particular to a detection fixing tool for an electric power steering gear mandrel assembly. The detection fixing tool comprises a base, a gear shaft cushion block, an input shaft cushion block and a spline cushion block are sequentially installed on the base through sliding rails, and a baffle is fixedly installed on the end face of the outer side of the spline cushion block. According to the detection fixing tool, the positions of the gear shaft cushion block, the input shaft cushion block and the spline cushion block can be respectively adjusted through the sliding rails, so that the distances among the gear shaft cushion block, the input shaft cushion block and the spline cushion block can be matched with mandrel assemblies of different models, the mandrel assemblies of different models can be detected, and the universality of the tool is greatly enhanced; in addition, due to the fact that the mandrel assemblies of different models can be detected, the number of needed detection tools can be greatly reduced, cost can be greatly reduced, and resource waste caused by tool scrapping is reduced. The problems that the universality is low, the cost is high and a large amount of resources are wasted due to the fact that an existing detection tool can only detect a mandrel assembly of a single model are solved.

Description

Technical Field

[0001] The utility model relates to a detection and fixing tooling, in particular to a detection and fixing tooling for a core shaft assembly of an electric power steering gear. Background Art

[0002] EPS (Electric Power Steering) has become a new trend and development direction of automotive steering. The core part of the electric steering gear is the core shaft assembly, and the core shaft assembly includes an input shaft, a torsion bar and a gear shaft (see the attached Figure 1 ). A spline is arranged on the input shaft at one end of the torsion bar, the input shaft end on one side of the spline is fixedly connected with the torsion bar, and the other end of the torsion bar is fixedly connected with the gear shaft. The working principle of the core shaft assembly is that when steering, a force is applied to the spline end of the input shaft (the driver applies a force on the steering wheel on the vehicle), the input shaft drives the torsion bar to rotate, the torsion bar deforms, the angle sensor generates a relative rotation angle, a set of torque signals are processed according to this angle sensor, this set of torque signals are transmitted to the controller, the controller provides a certain assist signal to the motor, the motor provides assistance to the gear shaft, drives the gear shaft to rotate, and then drives the tire to deflect and steer.

[0003] When symmetrically detecting the existing core shaft assembly of the electric power steering gear, a special test fixture is required. Since the lengths of various models of the core shaft assembly are different, it is necessary to prepare a matching special test fixture when testing the core shaft assembly of different model types (such as a fixture for detecting the depth of the deep hole of the gear shaft in CN110132106B). When each model of the core shaft assembly is respectively matched with a special test fixture, it not only results in low versatility and increased testing costs, but also the subsequent usage frequency of the test fixtures of different model types is extremely low. Once the product is changed in model and production stops, it will lead to a large number of tooling fixtures being sluggish and scrapped, causing a huge waste of resources. Therefore, it is necessary to develop a detection and fixing tooling for the core shaft assembly of the electric power steering gear to solve the above problems. Summary of the Invention

[0004] The purpose of the utility model is to provide a detection and fixing tooling for the core shaft assembly of an electric power steering gear with strong versatility, which can meet the testing requirements of different models of the core shaft assembly, thereby greatly reducing the testing cost and reducing the waste of resources.

[0005] The technical solution of the utility model is as follows:

[0006] A detection and fixing tooling for the core shaft assembly of an electric power steering gear includes a base, a gear shaft cushion block, an input shaft cushion block, a spline cushion block and a baffle. It is characterized in that: the gear shaft cushion block, the input shaft cushion block and the spline cushion block are sequentially installed on the base from left to right through a slide rail, strip-shaped holes are respectively arranged on the base on both sides of the slide rail, and the gear shaft cushion block, the input shaft cushion block and the spline cushion block are respectively locked with the base through set bolts passing through the strip-shaped holes; a baffle is fixedly installed on the outer end face of the spline cushion block.

[0007] The tops of the described gear shaft pads, input shaft pads, and spline pads are respectively installed with pressing plates through locking bolts.

[0008] A step position limiting block is arranged on the input shaft pad on one side of the described gear shaft pad.

[0009] A drill bushing is arranged on the pressing plate at the top of the described spline pad.

[0010] A detection and fixing tooling for a motor-driven power steering spindle assembly further includes a detection clamp that is clamped and fixed at the end of the gear shaft of the spindle assembly and is used in cooperation with an angle gauge to detect the rotation angle of the torsion bar.

[0011] The beneficial effects of the present utility model are as follows:

[0012] The detection and fixing tooling for the motor-driven power steering spindle assembly can respectively adjust the positions of the gear shaft pad, input shaft pad, and spline pad through the slide rail, so that the distance between the gear shaft pad, input shaft pad, and spline pad can match the spindle assemblies of different models, thereby enabling the detection of spindle assemblies of different models, greatly enhancing the versatility of the tooling; because it can detect spindle assemblies of different models, the required quantity of detection tooling can be greatly reduced, thereby greatly reducing costs and reducing the waste of resources caused by the scrapping of tooling. It solves the problems of the existing detection tooling that can only detect spindle assemblies of a single model, resulting in low versatility, high costs, and a large amount of resource waste. Description of the Drawings

[0013] Figure 1 is a cross-sectional schematic view of the spindle assembly;

[0014] Figure 2 is a front view schematic of the present utility model;

[0015] Figure 3 is a top view schematic of the present utility model;

[0016] Figure 4 is a right view schematic of the present utility model;

[0017] Figure 5 is a structural schematic of the detection clamp of the present utility model.

[0018] In the figure: 1, base; 2, gear shaft pad; 3, input shaft pad; 4, spline pad; 5, baffle; 6, slide rail; 7, strip hole; 8, set screw; 9, locking bolt; 10, pressing plate; 11, step position limiting block; 12, drill bushing; 13, detection clamp; 14, gear shaft; 15, input shaft; 16, torsion bar. Detailed Embodiments

[0019] The detection and fixing tooling for the electric power steering spindle assembly includes a base 1, a gear shaft spacer 2, an input shaft spacer 3, a spline spacer 4 and a baffle 5. An input shaft spacer 3 is arranged above the base 1 to support and position the end of the input shaft on one side of the gear shaft through the input shaft spacer 3. A gear shaft spacer 2 is arranged at the end of the base 1 on one side of the input shaft spacer 3 to support and position the gear shaft through the gear shaft spacer 2, and the distance between the input shaft and the gear shaft is detected through the cooperation of the gear shaft spacer 2 and the input shaft spacer 3. A spline spacer 4 is arranged at the end of the base 1 on the other side of the input shaft spacer 3 to support and position the spline end of the input shaft through the spline spacer 4, so as to detect the length of the input shaft through the cooperation of the spline spacer 4 and the input shaft spacer 3. A slide rail 6 is arranged on the base 1, and the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 are respectively slidably connected with the base 1 through the slide rail 6. Strip-shaped holes 7 are respectively arranged on the base 1 on both sides of the slide rail 6, and the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 are respectively locked with the base 1 through set bolts 8 passing through the strip-shaped holes 7. Since the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 can respectively slide relative to the base 1 through the slide rail 6, the positions of the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 on the base 1 can be respectively adjusted, and the distances between the gear shaft spacer 2 and the input shaft spacer 3 and between the input shaft spacer 3 and the spline spacer 4 can be adjusted. By adjustment, the length detection of each part of the spindle assembly is matched with the model of the spindle assembly, so that various models of spindle assemblies can be detected, greatly reducing the number of detection toolings, reducing costs, and reducing scrapped toolings, thereby reducing resource waste. The function of the set bolt 8 is to lock the positions of the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 through the set bolt 8 after the positions of the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 are adjusted, so that the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 will not shift during the detection process, thus ensuring accurate detection. A baffle 5 is fixedly installed on the outer end face of the spline spacer 4 to position the end face of the input shaft through the baffle 5, so as to detect the length of the input shaft starting from the end face of the input shaft.

[0020] Pressure plates 10 are respectively installed on the tops of the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 through locking bolts 9 to press and fix the spindle assembly on the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 through the pressure plates 10. Thus, after the detection of the spindle assembly is completed, the spindle assembly is pressed and fixed through the cooperation of the gear shaft spacer 2, the input shaft spacer 3, the spline spacer 4 and the pressure plates 10 respectively, which is convenient for reprocessing the spindle assembly.

[0021] A step position limit block 11 is arranged on the input shaft spacer 3 on one side of the gear shaft spacer 2 to position the step between the input shaft and the gear shaft of the spindle assembly through the step position limit block 11, so as to assist the input shaft spacer 3 to accurately position the end of the input shaft and ensure accurate detection results.

[0022] A drill bushing 12 is provided on a pressure plate 10 at the top end of the spline spacer block 4, so as to guide a drill bit through the drill bushing 12 to enable the drill bit to drill holes at accurate positions at the end of the input shaft.

[0023] The detection and fixing tooling for the electric power steering spindle assembly further includes a detection clamp 13 which is clamped and fixed at the end of the gear shaft of the spindle assembly and is used in cooperation with a protractor to detect the rotation angle of the torsion bar.

[0024] Before the detection and fixing tooling for the electric power steering spindle assembly performs detection, loosen the set bolts 8 that lock the locking gear shaft spacer block 2, the input shaft spacer block 3 and the spline shaft spacer block 4, so that the locking gear shaft spacer block 2, the input shaft spacer block 3 and the spline shaft spacer block 4 can slide on the base 1 along the slide rail 6. After the set bolts 8 are loosened, respectively adjust the positions of the locking gear shaft spacer block 2, the input shaft spacer block 3 and the spline shaft spacer block 4 according to the model of the spindle assembly to be detected, so that the distances between the locking gear shaft spacer block 2, the input shaft spacer block 3 and the spline shaft spacer block 4 are consistent with the process requirements and match the model of the spindle assembly to be detected. After the locking gear shaft spacer block 2, the input shaft spacer block 3 and the spline shaft spacer block 4 are adjusted in place, tighten the set bolts 8 to lock the locking gear shaft spacer block 2, the input shaft spacer block 3 and the spline shaft spacer block 4.

[0025] When the detection and fixing tooling for the core shaft assembly of the electric power steering gear is in detection, the locking bolts 9 are loosened respectively, and the pressure plates 10 are removed from the gear shaft spacer 2, the input shaft spacer 3 and the spline shaft spacer 4 respectively. After the pressure plates 10 are removed, the end of the input shaft of the core shaft assembly is inserted from the step position limit 11 on one side of the gear shaft spacer 2, so that the end face of the input shaft abuts against the baffle 5, and the core shaft assembly is placed flat on the gear shaft spacer 2, the input shaft spacer 3 and the spline shaft spacer 4. Observe the states of the core shaft assembly and the gear shaft spacer 2, the input shaft spacer 3 and the spline shaft spacer 4. When the core shaft assembly fits with the gear shaft spacer 2, the input shaft spacer 3 and the spline shaft spacer 4 without interference respectively, the core shaft assembly is qualified; when there is interference between the core shaft assembly and any one of the gear shaft spacer 2, the input shaft spacer 3 and the spline shaft spacer 4, the core shaft assembly is unqualified. After the core shaft assembly is qualified, the pressure plate 10 is installed on the input shaft spacer 3 and the spline shaft spacer 4 through the locking bolt 9 to press and fix the input shaft. After the input shaft is pressed and fixed, the detection clamp 13 is sleeved on the end of the gear shaft, and the detection clamp 13 is locked and fixed on the gear shaft by passing a bolt through the bolt hole at the bottom of the detection clamp 13. After the detection clamp 13 is fixed, the MHY-10445 digital display angle gauge is placed on the top end face of the detection clamp 13, and the gear shaft is rotated through the detection clamp 13, so as to twist the torsion bar, detect the left and right limit rotation angles of the torsion bar, and thus calculate the middle angle of the torsion bar, that is, the middle angle between the flat sides of the input shaft and the gear shaft. The clamping angle of the core shaft assembly is adjusted according to the obtained angle. After adjusting the angle of the core shaft assembly, the pressure plates 10 are fixed on the gear shaft spacer 2, the input shaft spacer 3 and the spline shaft spacer 4 respectively through the locking bolts 9, and the gear shaft and the input shaft of the core shaft assembly are locked and positioned respectively.

[0026] The detection and fixing tooling for the core shaft assembly of the electric power steering gear can adjust the positions of the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 respectively through the slide rail 6, so that the distances between the gear shaft spacer 2, the input shaft spacer 3 and the spline spacer 4 can match the core shaft assemblies of different models, so as to detect the core shaft assemblies of different models, greatly enhancing the versatility of the tooling; because the core shaft assemblies of different models can be detected, the required quantity of the detection tooling can be greatly reduced, thus greatly reducing the cost and reducing the waste of resources caused by the scrapping of the tooling. It solves the problems that the existing detection tooling can only detect the core shaft assembly of a single model, resulting in low versatility, high cost and a large amount of resource waste.

Claims

1. A detection and fixing tool for an electric power steering spindle assembly, comprising a base (1), a gear shaft pad (2), an input shaft pad (3), a spline pad (4) and a baffle (5), characterized in that: A gear shaft pad (2), an input shaft pad (3), and a spline pad (4) are sequentially mounted on the base (1) from left to right via a slide rail (6). Strip holes (7) are respectively arranged on the base (1) on both sides of the slide rail (6). The gear shaft pad (2), the input shaft pad (3), and the spline pad (4) are respectively locked with the base (1) via fixing bolts (8) passing through the strip holes (7). A baffle (5) is fixedly mounted on the outer end surface of the spline pad (4).

2. The detection and fixing tool for the electric power steering spindle assembly according to claim 1 is characterized in that: The tops of the gear shaft pad (2), the input shaft pad (3), and the spline pad (4) are respectively mounted with pressure plates (10) via locking bolts (9).

3. The detection and fixing tool for the electric power steering spindle assembly according to claim 1 is characterized in that: A step position limiting block (11) is provided on the input shaft pad (3) on one side of the gear shaft pad (2).

4. The detection and fixing tool for the electric power steering spindle assembly according to claim 2 is characterized in that: A drill sleeve (12) is provided on the pressure plate (10) at the top end of the spline pad (4).

5. The detection and fixing tool for the electric power steering spindle assembly according to claim 1 is characterized in that: It also includes a detection clamp (13) which is clamped and fixed on the end of the gear shaft of the spindle assembly and is used in conjunction with an inclinometer to detect the rotation angle of the torsion bar.

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