Embedded rigid bushing sensor cover for steering engine

Abstract

The utility model relates to the technical field of machinery, in particular to an embedded rigid bushing sensor cover for a steering engine, which comprises a sensor cover body and a rigid bushing, the rigid bushing is embedded in a mounting hole of the sensor cover body, and the rigid bushing and the sensor cover body are of an integrated injection molding structure. The end face of the rigid lining is exposed out of the surface of the sensor cover body, the outer diameter of the end face of the rigid lining is larger than that of the flange face of the bolt, and a vertically-arranged boss is installed on the side face of the rigid lining. Compared with the prior art, the rigid bushing and the sensor cover adopt an integrated injection molding structure, so that the bushing press-in process is reduced, the problem that the sensor cover is cracked when the bushing is pressed in is avoided, and the process cost is also reduced; the outer diameter of the end face of the rigid lining is larger than that of the bolt flange face, and the problem that the sensor cover cracks when the bolt is tightened is avoided. The boss design of the rigid bushing solves the problem of following rotation of the rigid bushing when the bolt is tightened.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, and particularly relates to an embedded rigid bushing sensor cover for a steering gear. Background Art

[0002] In an electric power steering system, a plastic sensor cover is tightened to the steering gear by bolts. The plastic sensor cover is used to protect components such as sensors and prevent dust, liquid, etc. from entering the sensors and causing them to fail.

[0003] Generally, in the sensor cover mounting hole, a rigid bushing needs to be press-fitted to prevent the bolts from cracking the plastic sensor cover.

[0004] However, this structure has the following problems: 1. Since the press-fitted rigid bushing and the sensor cover mounting hole are in interference fit, the plastic sensor cover may be cracked when the rigid bushing is pressed in. 2. The outer diameter of the rigid bushing is smaller than the flange surface of the bolt, resulting in the bolt flange surface contacting the plastic sensor cover, and there is also a risk of cracking the plastic sensor cover when the bolt is tightened. 3. Since the press-in type rigid bushing is circular, the rigid bushing may rotate together with the bolt when the bolt is tightened.

[0005] Currently, generally, by strictly controlling the diameter tolerances of the sensor cover mounting hole and the rigid bushing, and thus ensuring the stability of the interference amount and strictly controlling the tightening range, such measures of tightening the tolerances are taken to reduce the occurrence of sensor cover cracking. However, such measures will result in high costs and cannot completely solve the problem of sensor cover cracking.

[0006] Therefore, it is necessary to design an embedded rigid bushing sensor cover for a steering gear to completely solve the problem of sensor cover cracking. Summary of the Invention

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an embedded rigid bushing sensor cover for a steering gear to completely solve the problem of sensor cover cracking.

[0008] To achieve the above purpose, the utility model is an embedded rigid bushing sensor cover for a steering gear, which includes a sensor cover body and a rigid bushing. The rigid bushing is embedded in the mounting hole of the sensor cover body, and the rigid bushing and the sensor cover body are of an integrally injection-molded structure. The end face of the rigid bushing is exposed on the surface of the sensor cover body. The outer diameter of the end face of the rigid bushing is larger than the outer diameter of the flange surface of the bolt. A vertically arranged boss is installed on the side surface of the rigid bushing.

[0009] There are two bosses, and the two bosses are oppositely arranged on both sides of the rigid bushing.

[0010] The surface of the boss is provided with a round hole, and the round hole penetrates the front and rear surfaces of the boss.

[0011] A raised structure is provided on the end face of the rigid bushing, and a groove structure is provided on the lower surface of the flange of the bolt. The raised structure corresponds to the groove structure.

[0012] The raised structure includes a plurality of strip-shaped bumps. One end of the strip-shaped bump is located in the inner circle of the end face of the rigid bushing, and the other end of the strip-shaped bump is located in the outer circle of the end face of the rigid bushing. The groove structure includes a plurality of strip-shaped grooves. One end of the strip-shaped groove is located in the inner circle of the lower surface of the bolt flange, and the other end of the strip-shaped groove is located in the outer circle of the lower surface of the bolt flange. After the bolt is installed in place, the strip-shaped bumps are embedded in the corresponding strip-shaped grooves.

[0013] After the bolt passes through the rigid bushing, it is fixed to the steering gear housing.

[0014] Compared with the prior art, in the present utility model, the rigid bushing and the sensor cover adopt an integrally injection-molded structure, which reduces the bushing pressing process, avoids the cracking problem of the sensor cover caused by bushing pressing, and also reduces the process cost; the outer diameter of the end face of the rigid bushing is larger than the outer diameter of the bolt flange surface, avoiding the cracking problem of the sensor cover caused by bolt tightening; the boss design of the rigid bushing solves the problem of the rigid bushing rotating with the bolt tightening. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present utility model.

[0016] Figure 2 is an axonometric view of the rigid bushing of the present utility model.

[0017] Figure 3 is an axonometric view of the mating bolt of the present utility model.

[0018] Figure 4 is an installation schematic diagram of the rigid bushing and the bolt of the present utility model.

[0019] Figure 5 is a cross-sectional view of the rigid bushing and the bolt of the present utility model. Detailed Embodiment

[0020] The present utility model will be further described below in conjunction with the drawings.

[0021] See Figure 1 、 Figure 2, the utility model is an embedded rigid bushing sensor cover for a steering gear, including a sensor cover body and a rigid bushing. The rigid bushing 4 is embedded in the mounting hole of the sensor cover body 2, and the rigid bushing 4 and the sensor cover body 2 are of an integrally injection-molded structure. The end face of the rigid bushing 4 is exposed on the surface of the sensor cover body 2. The outer diameter of the end face of the rigid bushing 4 is larger than the outer diameter of the flange face of the bolt 3. A vertically arranged boss 41 is installed on the side of the rigid bushing 4.

[0022] The material of the rigid bushing 4 is 45# steel plate. When injecting the sensor cover body 2, the rigid bushing 4 is placed in the mold and injection-molded together. This injection process is a very mature existing technology and can be realized using existing injection equipment. The integrally injection-molded structure avoids the problem of cracking of the sensor cover caused by the radial force generated when the bushing is pressed into the sensor cover.

[0023] The outer diameter of the end face of the rigid bushing 4 is larger than the outer diameter of the flange face of the bolt 3. When the bolt 3 is tightened, the end face of the rigid bushing 4 can avoid the problem of cracking of the sensor cover body 2 caused by the axial force of the bolt 3.

[0024] The boss 41 is provided to prevent the rigid bushing 4 from rotating together with the bolt 3 when the bolt 3 is tightened. Preferably, there are two bosses 41, and the two bosses 41 are oppositely arranged on both sides of the rigid bushing 4.

[0025] A round hole 42 is provided on the surface of the boss 41, and the round hole 42 penetrates the front and rear surfaces of the boss 41. Since the plastic will shrink during cooling after injection molding, the round hole 42 is added to the boss 41 of the rigid bushing 4. During injection molding, the plastic fills the round hole 42 to form a plastic cylinder, increasing the contact area and reducing the shrinkage amount. When a large shrinkage occurs, the plastic cylinder in the round hole 42 can also achieve the functions of anti-loosening and anti-rotation.

[0026] See Figure 2 、 Figure 3 and Figure 4 , a circular raised structure 43 is provided on the end face of the rigid bushing 4, and a circular groove structure 31 is provided on the lower surface of the flange of the bolt 3. The raised structure 43 corresponds to the groove structure 31 to increase the friction coefficient between the bolt 3 and the rigid bushing 4. After the bolt 3 is tightened in place, relative rotation between the bolt 3 and the boss 41 is prevented.

[0027] The raised structure 43 includes a number of long strip-shaped convex blocks. One end of the long strip-shaped convex block is located in the inner circle of the end face of the rigid bushing 4, and the other end of the long strip-shaped convex block is located in the outer circle of the end face of the rigid bushing 4. The groove structure 31 includes a number of long strip-shaped grooves. One end of the long strip-shaped groove is located in the inner circle of the lower surface of the flange of the bolt 3, and the other end of the long strip-shaped groove is located in the outer circle of the lower surface of the flange of the bolt 3. After the bolt 3 is installed in place, the long strip-shaped convex block is embedded in the corresponding long strip-shaped groove.

[0028] See Figure 5 Figure 5 , after the bolt 3 passes through the rigid bushing 4, it is fixed to the steering gear housing 1, realizing the original protection function of the sensor cover while ensuring no cracking.

[0029] The rigid bushing of the present utility model and the sensor cover adopt an integral injection molding structure, reducing the bushing pressing process, avoiding the cracking problem of the sensor cover caused by bushing pressing, and also reducing the process cost; the outer diameter of the end face of the rigid bushing is larger than the outer diameter of the bolt flange face, avoiding the cracking problem of the sensor cover caused by bolt tightening; the boss design of the rigid bushing solves the problem of the rigid bushing following rotation when the bolt is tightened.

Claims

1. An embedded rigid bushing sensor cover for a steering gear, comprising a sensor cover body and a rigid bushing, characterized in that: The rigid bushing (4) is embedded in the mounting hole of the sensor cover body (2), and the rigid bushing (4) and the sensor cover body (2) are of an integrally injection-molded structure. The end face of the rigid bushing (4) is exposed on the surface of the sensor cover body (2). The outer diameter of the end face of the rigid bushing (4) is larger than the outer diameter of the flange face of the bolt (3). A vertically arranged boss (41) is installed on the side surface of the rigid bushing (4).

2. An embedded rigid bushing sensor cover for a steering gear according to claim 1, characterized in that: There are two bosses (41), and the two bosses (41) are oppositely arranged on both sides of the rigid bushing (4).

3. An embedded rigid bushing sensor cover for a steering gear according to claim 1, characterized in that: A round hole (42) is provided on the surface of the boss (41), and the round hole (42) penetrates through the front and rear surfaces of the boss (41).

4. An embedded rigid bushing sensor cover for a steering gear according to claim 1, characterized in that: A ring of raised structure (43) is provided on the end face of the rigid bushing (4), and a ring of groove structure (31) is provided on the lower surface of the flange of the bolt (3), and the raised structure (43) corresponds to the groove structure (31).

5. An embedded rigid bushing sensor cover for a steering gear according to claim 4, characterized in that: The raised structure (43) includes a number of elongated convex blocks. One end of the elongated convex block is located in the inner circle of the end face of the rigid bushing (4), and the other end of the elongated convex block is located in the outer circle of the end face of the rigid bushing (4). The groove structure (31) includes a number of elongated grooves. One end of the elongated groove is located in the inner circle of the lower surface of the flange of the bolt (3), and the other end of the elongated groove is located in the outer circle of the lower surface of the flange of the bolt (3). After the bolt (3) is installed in place, the elongated convex block is embedded in the corresponding elongated groove.

6. An embedded rigid bushing sensor cover for a steering gear according to claim 1, characterized in that: After the bolt (3) passes through the rigid bushing (4), it is fixed to the steering gear housing (1).

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