Air tightness detection channel sealing structure of electric power steering gear

Abstract

The utility model discloses an electric power steering gear airtightness detection channel sealing structure which comprises a steering gear body, the steering gear body is provided with an airtightness detection channel, the end portion of the airtightness detection channel is provided with a plugging nut in a threaded mode, the plugging nut is provided with a detection hole penetrating in the axial direction, and the detection hole is communicated with the airtightness detection channel. A sealing cover is plugged in the detection hole and is provided with an end plate and a cylinder protruding from one side of the end plate, a clamping tongue protruding outwards in the radial direction is arranged at the end, away from the end plate, of the cylinder, an elastic sealing ring is arranged at the position, close to the end plate, of the cylinder, and after the sealing cover is installed in the detection hole, the clamping tongue is buckled at the inner end of the detection hole. And the elastic sealing ring is elastically pressed between the outer end of the detection hole and the end plate. The beneficial effects are that air tightness detection can be conveniently carried out through the detection hole arranged on the plugging nut, the detection hole can be firmly plugged through the interaction between the elastic sealing ring and the clamping tongue on the sealing cover, the air tightness is guaranteed, and the plugging nut is not easy to fall off.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle steering system technical field, concretely relates to a kind of electric power steering gear box airtight detection passage sealing structure. BACKGROUND

[0002] Steering gear is one of the important parts of automobile, it can transform the steering torque and steering angle from steering wheel, then output to steering drag link mechanism, so that the automobile steering. Since steering gear assembly is installed on the bottom of automobile, the requirement of waterproof, dustproof, impurity prevention of steering gear assembly is higher, so steering gear assembly needs to be airtightness detection after assembly, to ensure the dustproof, moisture-proof characteristics of steering gear assembly.

[0003] In addition, in actual use, the airtightness detection port of steering gear assembly usually needs to be plugged by blocking nut to ensure the overall airtightness, but when subsequent airtightness detection is needed, the blocking nut needs to be removed, which is not only very troublesome, but also may cause thread slipping or seizure over time, affecting the overall airtightness. SUMMARY

[0004] Therefore, the utility model provides a kind of electric power steering gear box airtight detection passage sealing structure, which can ensure that the detection port is effectively plugged and facilitate airtightness detection.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A kind of electric power steering gear box airtight detection passage sealing structure, including steering gear body, the steering gear body has airtightness detection passage, the airtightness detection passage end is equipped with blocking nut with screw thread, characterized by: the blocking nut is equipped with the detection hole that penetrates along the axial direction, the detection hole is communicated with the airtightness detection passage, the sealing cover is inserted in the detection hole, the sealing cover has end plate and the column body protruding from the side of end plate, the column body is equipped with the card tongue that protrudes outward along radial direction at the end away from end plate, the position of column body close to end plate is equipped with elastic sealing ring, after the sealing cover is installed in the detection hole, the card tongue is buckled in the end of detection hole, and the elastic sealing ring is elastically compressed between the outer end of detection hole and end plate.

[0007] By the detection hole opened on the blocking nut, airtightness detection can be facilitated, and the detection hole can be tightly plugged by the interaction between the elastic sealing ring and the card tongue on the sealing cover, ensuring airtightness without falling easily.

[0008] As a preferred embodiment: the outer end of the detection hole is provided with a chamfer, and the elastic sealing ring is extruded in the chamfer. By the above structure, the airtightness of the whole sealing cover after installation can be further ensured.

[0009] Preferably, the upper end of the clamping tongue has a support surface extending in the horizontal direction, which can tightly contact the bottom surface of the blocking nut. With the above structure, the support surface can tightly contact the bottom surface of the blocking nut under the elastic force of the elastic sealing ring, thereby ensuring the air tightness of the entire electric steering gear.

[0010] Preferably, the outer side of the clamping tongue has a guide inclined surface extending towards the central axis of the column. With the above structure, the sealing cover can be conveniently installed in the detection hole.

[0011] Preferably, the cross section of the detection hole is the same as the lower end cross section of the sealing cover. With the above structure, the sealing cover can be further conveniently installed.

[0012] Preferably, the lower end of the blocking nut is circumferentially provided with a first annular groove, and an elastic sealing ring is arranged in the first annular groove and tightly contacts the inner wall of the air tightness detection channel. With the above structure, the blocking nut can block the air tightness detection channel, and air tightness detection can only be performed through the detection hole.

[0013] Preferably, a support plug is arranged in the air tightness detection channel, the support plug has a through hole penetrating in the vertical direction in the middle portion, the through hole can be communicated with the detection hole, and an elastic element is arranged between the support plug and the blocking nut. With the above structure, air tightness detection can be conveniently performed through the through hole, and the elastic element can stably abut against the transmission component at the other end of the support plug, so that the overall structure is more stable.

[0014] Preferably, the elastic element is a compression spring, the support plug is provided with a first sunken table, the bottom of the blocking nut is provided with a second sunken table, and the two ends of the compression spring are respectively supported in the first sunken table and the second sunken table. With the above structure, the compression spring can be conveniently and stably installed.

[0015] Preferably, the support plug is circumferentially provided with a second annular groove, and the second annular groove is sleeved with the elastic sealing ring. With the above structure, the plug can be more stable and the air tightness detection channel can be blocked, and the plug cannot be easily shaken.

[0016] Preferably, the bottom of the blocking nut is provided with a third annular groove, the third annular groove is sleeved with the elastic sealing ring, and the bottom of the elastic sealing ring is supported on the top of the support plug. With the above structure, the blocking nut and the support plug can be tightly connected, and the overall air tightness can be ensured.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1. The utility model provides an electric power assisted steering gear airtight detection channel sealing structure, set up detection hole on the plugging nut, avoid the airtightness detection to take down the plugging nut, elastic sealing washer is elastically pressed between the outer end of detection hole and end plate, with the elastic thrust, can make the clamping tongue tightly buckle in the inner end of detection hole, guarantee the reliable installation of sealing cover and sealing washer. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the sectional view schematic diagram of steering gear main part;

[0020] Figure 2 It is Figure 1 the local enlarged schematic diagram (has hidden sealing washer 4);

[0021] Figure 3 It is the structural schematic diagram of airtightness detection channel 1a;

[0022] Figure 4 It is the structural schematic diagram of sealing cover. DETAILED DESCRIPTION

[0023] The utility model is further explained below in combination with the embodiment and the accompanying drawings.

[0024] As Figures 1 to 4 shown, an electric power assisted steering gear airtight detection channel sealing structure, including steering gear main part 1, steering gear main part 1 has airtightness detection channel 1a, is equipped with plugging nut 2 at airtightness detection channel 1a end portion threadedly, is formed with the detection hole 2a that penetrates along the circumference on plugging nut 2, and the detection hole 2a is linked with airtightness detection channel 1a, and the sealing cover 3 is inserted in the detection hole 2a, and the sealing cover 3 has end plate 3d and the column body 3c that protrudes from end plate 3d downside, and the lower end of column body 3c is formed with the clamping tongue 3b that protrudes outward along the radial direction, and the position of column body 3c close to end plate 3d is formed with elastic sealing washer 3a, and after sealing cover 3 is installed in the detection hole 2a, the clamping tongue 3b can buckle in the inner end of detection hole 2a, and elastic sealing washer 3a is elastically pressed between the outer end of detection hole 2a and end plate 3d.

[0025] So design, through the detection hole 2a that is opened on plugging nut 2, can facilitate airtightness detection, avoid additional plugging nut 2 to be taken out, utilize the interaction between elastic sealing washer 3a and clamping tongue 3b on sealing cover 3, can very firmly block detection hole 2a, guarantee the whole airtightness while also not easily fall off.

[0026] As Figure 4As shown, in the embodiment, the lower end of the column 3c is circumferentially formed with three clamping tongues 3b, and the upper end of each clamping tongue 3b is provided with a support surface 3b1 extending in the horizontal direction, which is in close contact with the bottom surface of the blocking nut 2. In this way, through the mutual interference between the support surface 3b1 and the bottom surface of the blocking nut 2, and by using the elastic force of the elastic sealing ring 3a, the sealing cover 3 can be stably installed in the detection hole 2a.

[0027] Further, the outer side of each clamping tongue 3b is provided with a guide inclined surface 3b2 extending towards the central axis of the column 3c, which can facilitate the installation of the sealing cover 3 on the detection hole 2a.

[0028] In the embodiment, the cross section of the detection hole 2a is the same as that of the lower end of the sealing cover 3, and the cross-sectional size of the detection hole 2a should be smaller than that of the elastic sealing ring 3a. In this way, the installation of the sealing cover 3 can be facilitated, and the overall air tightness can be ensured.

[0029] Based on the above structure, after the column 3c is inserted into the detection hole 2a, the sealing cover 3 only needs to be rotated, so that the clamping tongue 3b abuts against the bottom surface of the blocking nut 2, and the sealing cover 3 is locked on the blocking nut 2.

[0030] In the embodiment, the number of clamping tongues 3b formed at the lower end of the column 3c is not limited to three, and after the column 3c is inserted into the detection hole 2a, the corresponding rotation angle of the sealing cover 3 is also different.

[0031] As shown in Figure 3 , the outer end of the detection hole 2a is formed with a chamfer 2a1, and after the sealing cover 3 is installed in the detection hole 2a, the elastic sealing ring 3a is pressed in the chamfer 2a1.

[0032] As shown in Figure 1 and Figure 2 , the lower end of the blocking nut 2 is circumferentially formed with a first annular groove 2b, and a sealing ring 4 is sleeved in the first annular groove 2b. The sealing ring 4 can be in close contact with the inner wall of the air tightness detection channel 1a. In this way, it can be ensured that the blocking nut 2 blocks the air tightness detection channel 1a, and only the detection hole 2a can be used for air tightness detection.

[0033] As shown in Figure 2 , a support plug 5 is also inserted in the air tightness detection channel 1a, and the support plug 5 is provided with a through hole 5a penetrating in the vertical direction, which can communicate with the detection hole 2a. An elastic element 6 is installed between the support plug 5 and the blocking nut 2.

[0034] In the embodiment, the elastic element 6 is a compression spring, the support plug 5 is formed with a first sunken platform 5b at the top, the sealing nut 2 is formed with a second sunken platform 2c at the bottom, and the compression spring is supported between the first sunken platform 5b and the second sunken platform 2c. In this way, the compression spring can be stably supported between the support plug 5 and the sealing nut 2 through the first sunken platform 5b and the second sunken platform 2c, and the support plug 5 can be tightly abutted against the transmission component inside the steering gear body 1 through the elastic effect of the compression spring, so that the overall structure is more stable.

[0035] As shown in Figure 2 The support plug 5 is formed with a second annular groove 5c, and the second annular groove 5c is also sleeved with a sealing ring 4, so that the support plug 5 can be more completely sealed in the airtightness detection channel 1a and cannot be shaken in the airtightness detection channel 1a.

[0036] Further, the sealing nut 2 is also formed with a third annular groove 2d at the bottom, the third annular groove 2d is also sleeved with a sealing ring 4, and the bottom of the sealing ring 4 is supported on the top of the support plug 5. In this way, the sealing nut 2 and the support plug 5 can be tightly connected together, so that the entire airtight channel can only pass through the detection hole 2a to the through hole 5a and finally communicate with the inside of the steering gear body 1.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without violating the purpose and claims of the present application. Such changes fall within the scope of the present application.

Claims

1. A hermetic detection channel sealing structure of an electric power assisted steering gear, comprising a steering gear body (1) having a hermetic detection channel (1a) with a blocking nut (2) threadedly fitted at the end thereof, characterized in that: The sealing nut (2) is provided with an axial detection hole (2a) penetrating through the sealing nut (2), the detection hole (2a) is communicated with the air tightness detection channel (1a), the detection hole (2a) is provided with a sealing cover (3), the sealing cover (3) has an end plate (3d) and a column (3c) protruding from one side of the end plate (3d), the column (3c) is provided with a radial outwardly protruding clamping tongue (3b) at the end away from the end plate (3d), the column (3c) is provided with an elastic sealing ring (3a) close to the end plate (3d), after the sealing cover (3) is installed in the detection hole (2a), the clamping tongue (3b) is buckled at the inner end of the detection hole (2a), and the elastic sealing ring (3a) is elastically compressed between the outer end of the detection hole (2a) and the end plate (3d).

2. The electric power assisted steering gear airtight detection channel sealing structure according to claim 1, characterized in that: The outer end of the detection hole (2a) is provided with a chamfer (2a1), and the elastic sealing ring (3a) is extruded in the chamfer (2a1).

3. The electric power assisted steering gear airtight detection channel sealing structure according to claim 1, characterized in that: The upper end of the clamping tongue (3b) has a horizontal support surface (3b1), and the support surface (3b1) can tightly abut the bottom surface of the sealing nut (2).

4. The electric power assisted steering gear hermetic detection passage seal structure according to claim 3, characterized by: The outer side of the clamping tongue (3b) has a guide inclined surface (3b2) extending towards the central axis of the column (3c).

5. The electric power assisted steering gear hermetic detection passage seal structure according to claim 4, characterized by: The cross section of the detection hole (2a) is the same as the lower end cross section of the sealing cover (3).

6. The electric power assisted steering gear hermetic detection channel seal structure of claim 1, wherein: The lower end of the sealing nut (2) is provided with a first annular groove (2b), the first annular groove (2b) is provided with a sealing ring (4), and the sealing ring (4) tightly abuts the inner wall of the air tightness detection channel (1a).

7. The electric power assisted steering gear hermetic detection channel seal structure of claim 6, wherein: The air tightness detection channel (1a) is provided with a support plug (5), the support plug (5) has a vertical through hole (5a) in the middle, the through hole (5a) can be communicated with the detection hole (2a), and the support plug (5) and the sealing nut (2) are provided with an elastic element (6).

8. The electric power assisted steering gear hermetic detection channel seal structure according to claim 7, characterized in that: The elastic element (6) is a compression spring, the support plug (5) is provided with a first sunken platform (5b), the bottom of the sealing nut (2) is provided with a second sunken platform (2c), and the two ends of the compression spring are supported in the first sunken platform (5b) and the second sunken platform (2c) respectively.

9. The electric power assisted steering gear hermetic detection passage seal structure according to claim 7, characterized by: The support plug (5) is provided with a second annular groove (5c), and the second annular groove (5c) is sleeved with the sealing ring (4).

10. The electric power assisted steering gear hermetic detection passage seal structure according to claim 7, characterized by: The bottom of the sealing nut (2) is provided with a third annular groove (2d), the third annular groove (2d) is sleeved with the sealing ring (4), and the bottom of the sealing ring (4) is supported on the top of the support plug (5).

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