A multi-level steering column dust cover

Abstract

The present invention discloses a multi-level steering column dust cover, wherein an installation cavity is provided inside the cover body, an internal sealing component is installed at a first end of the installation cavity, an outer wall of the cover body is provided with a fixing plate installation part extending in an annular manner, a side of the fixing plate installation part away from the internal sealing component is provided with a plurality of annular sealing ribs extending around the cover body, a fixing plate of a front tail plate is provided with an installation opening in the middle part, the fixing plate of the front tail plate is sleeved on the outside of the cover body through the installation opening and is installed on a side of the fixing plate installation part close to the internal sealing component; the fixing plate of the front tail plate is assembled on the vehicle body by bolt locking and fastening, and the locking and fastening force is transmitted to the sealing ribs of the cover body, so as to strengthen the sealing and sound insulation effect; the steering shaft is assembled with an internal sealing component at one end of the cover body, which has sealing and sound insulation effects and ensures the comfort during steering at the same time.

Description

Technical Field

[0001] The invention relates to the field of automobile steering gears, in particular to a multi-level steering column dust cover. Background Art

[0002] The function of the car steering gear is to properly transform the steering torque and steering angle from the steering wheel, and then output it to the steering rod mechanism to make the car steer. The steering gear is essentially a reduction transmission device. Because the steering wheel is inside the cockpit, and the steering rod mechanism connecting the wheels is outside the cockpit, the steering shaft connecting the steering wheel and the steering rod mechanism must be connected from inside the cockpit to outside the cockpit. In order to provide space for the steering shaft to pass, the front tail plate of the car must be evaded; and the steering column dust cover is to seal the front tail plate area to effectively isolate the impact of the environment outside the cockpit on the environment inside the cockpit.

[0003] At the same time, with the development of new energy vehicles, the requirements for noise in the cockpit are getting higher and higher. At the same time, the standards for automobile wading are tightened, resulting in increasingly stringent requirements for water sealing of steering column dust covers. It is urgent to develop a steering dust cover that has good sound insulation and can meet more stringent water sealing tests. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention provides a multi-level steering column dust cover.

[0005] The present invention provides a multi-level steering column dust cover, comprising: a cover body, a front tail plate fixing plate, and an internal sealing component;

[0006] An installation cavity is provided inside the cover body, and the internal sealing component is installed at the first end of the installation cavity. A ring-shaped extending fixing plate installation portion is provided on the outer wall of the cover body, and a plurality of ring-shaped sealing ribs extending around the cover body are provided on the side of the fixing plate installation portion away from the internal sealing component. An installation opening is provided in the middle of the front tail plate fixing plate, and the front tail plate fixing plate is sleeved on the outside of the cover body through the installation opening and installed on the side of the fixing plate installation portion close to the internal sealing component.

[0007] Preferably, a mounting boss is provided on the fixing plate mounting portion on one side facing the front and rear plate fixing plate, and a mounting through hole cooperating with the mounting boss is provided on the front and rear plate fixing plate.

[0008] Preferably, a V-shaped buffer groove extending in an annular manner around the cover body is provided on the side of the fixing plate mounting portion facing the internal sealing assembly.

[0009] Preferably, the internal sealing assembly comprises a front cover, a sliding ring, a housing, and a bottom cover;

[0010] The bottom cover is located in the first end opening of the installation cavity and extends in a circular shape along the inner wall of the first end opening. The shell is sleeved outside the first end of the installation cavity. The inner wall of the shell is provided with a supporting boss, and the supporting boss is located above the bottom cover. The sliding ring is located in the shell and above the supporting boss. The front cover is sleeved outside the shell, and the inner wall of the front cover is provided with a limiting boss for limiting the sliding ring.

[0011] Preferably, the outer wall of the bottom cover is provided with a first card slot, the inner wall of the shell is provided with a first card protrusion cooperating with the first card slot, the outer wall of the shell is provided with a second card slot, and the inner wall of the front cover is provided with a second card protrusion cooperating with the second card slot.

[0012] Preferably, the inner wall of the first end opening of the installation cavity is provided with a circularly extending clamping boss, and the outer wall of the bottom cover is provided with a mounting groove that cooperates with the clamping boss.

[0013] Preferably, an annular sealing felt is further included, the inner wall of the bottom cover forms a step structure extending along the clamping boss, and the annular sealing felt is located between the limiting boss and the step structure.

[0014] Preferably, a first limiting protrusion for limiting the position of the sliding ring is provided at the top of the supporting boss, and a second limiting protrusion for limiting the position of the sliding ring is provided at the bottom of the limiting boss;

[0015] A third limiting protrusion for limiting the position of the annular sealing felt is provided at the bottom of the supporting boss, and a fourth limiting protrusion for limiting the position of the annular sealing felt is provided at the top of the step structure.

[0016] Preferably, a preset sliding gap is provided between the outer wall of the sliding ring and the inner wall of the housing, and the sliding gap is filled with lubricating grease.

[0017] Preferably, the inner radial direction of the installation cavity gradually decreases towards the inner sealing component.

[0018] In the present invention, the proposed multi-level steering column dust cover has an installation cavity inside the cover body, an internal sealing component is installed at the first end of the installation cavity, an annularly extending fixed plate installation portion is provided on the outer wall of the cover body, a plurality of annular sealing ribs extending around the cover body are provided on the side of the fixed plate installation portion away from the internal sealing component, an installation opening is provided in the middle of the front tail plate fixing plate, the front tail plate fixing plate is sleeved on the outside of the cover body through the installation opening and installed on the side of the fixed plate installation portion close to the internal sealing component; the front tail plate fixing plate and the front tail plate are assembled on the vehicle body by bolt locking, and the locking assembly force will be transmitted to the sealing ribs of the cover body, thereby reinforcing the sealing and sound insulation effects; the steering shaft is assembled with the internal sealing component at one end of the cover body, which has sealing and sound insulation effects and ensures comfort during steering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1The present invention is a schematic cross-sectional structural diagram of a multi-level steering column dust cover.

[0020] Figure 2 The figure is a schematic top view of the structure of a multi-level steering column dust cover proposed by the present invention.

[0021] Figure 3 The present invention is a schematic structural diagram of an internal sealing assembly of a multi-level steering column dust cover. DETAILED DESCRIPTION

[0022] like Figures 1 to 3 As shown, Figure 1 This is a schematic cross-sectional view of a multi-level steering column dust cover proposed by the present invention. Figure 2 This is a schematic diagram of a top view of a multi-level steering column dust cover proposed by the present invention. Figure 3 The present invention is a schematic structural diagram of an internal sealing assembly of a multi-level steering column dust cover.

[0023] Reference Figure 1 and 2 The present invention provides a multi-level steering column dust cover, comprising: a cover body 1, a front tail plate fixing plate 2, and an internal sealing component 3;

[0024] An installation cavity is provided inside the cover body 1, and the internal sealing component 3 is installed at the first end of the installation cavity. An annularly extending fixed plate installation portion is provided on the outer wall of the cover body 1, and a plurality of annular sealing ribs extending around the cover body 1 are provided on the side of the fixed plate installation portion away from the internal sealing component 3. An installation opening is provided in the middle of the front tail plate fixing plate 2, and the front tail plate fixing plate 2 is sleeved on the outside of the cover body 1 through the installation opening and installed on the side of the fixed plate installation portion close to the internal sealing component 3.

[0025] During the specific working process of the multi-level steering column dust cover of this embodiment, the dust cover is assembled on the vehicle body through the front tail plate fixing plate and the front tail plate through bolt locking. The locking assembly force causes the sealing ribs of the cover body mounting part to deform, thereby strengthening the seal and achieving a sound insulation effect. At the same time, the internal sealing assembly assembled on the other end of the steering shaft through the cover body is installed in the mounting cavity, achieving a sealing and sound insulation effect.

[0026] In the present embodiment, the proposed multi-level steering column dust cover has an installation cavity inside the cover body, an internal sealing assembly is installed at the first end of the installation cavity, an annularly extending fixed plate installation portion is provided on the outer wall of the cover body, a plurality of annular sealing ribs extending around the cover body are provided on the side of the fixed plate installation portion away from the internal sealing assembly, an installation opening is provided in the middle of the front tail plate fixing plate, the front tail plate fixing plate is sleeved on the outside of the cover body through the installation opening and installed on the side of the fixed plate installation portion close to the internal sealing assembly; the front tail plate fixing plate and the front tail plate are assembled to the vehicle body by bolt locking, and the locking assembly force will be transmitted to the sealing ribs of the cover body, thereby reinforcing the sealing and sound insulation effects; the steering shaft is assembled with the internal sealing assembly at one end of the cover body, which has sealing and sound insulation effects while ensuring comfort during steering.

[0027] In a specific implementation of the front tail plate fixing plate and the cover body, a mounting boss 11 is provided on the fixing plate mounting portion facing the side of the front tail plate fixing plate 2, and a mounting through hole matching the mounting boss 11 is provided on the front tail plate fixing plate 2 to position the front tail plate fixing plate to prevent it from rotating during operation; in the specific installation method, the mounting boss and the mounting through hole can adopt an interference fit.

[0028] In other specific embodiments of the cover body, a V-shaped buffer groove extending in an annular manner around the cover body 1 is provided on the side of the fixed plate mounting portion facing the internal sealing component 3; the V-shaped groove and the mounting cavity form two cavity structures, providing deformation space and achieving multi-layer noise reduction.

[0029] Reference Figure 3 , in the specific design of the internal sealing assembly, the internal sealing assembly 3 includes a front cover 4, a sliding ring 5, a housing 6, and a bottom cover 8;

[0030] The bottom cover 8 is located in the first end opening of the installation cavity and extends in a ring shape along the inner wall of the first end opening. The shell 6 is sleeved on the outside of the first end of the installation cavity. The inner wall of the shell 6 is provided with a supporting boss 61. The supporting boss 61 is located above the bottom cover 8. The sliding ring 5 is located in the shell 6 and above the supporting boss 61. The front cover 4 is sleeved on the outside of the shell 6. The inner wall of the front cover 4 is provided with a limiting boss 41 for limiting the sliding ring 5.

[0031] During the specific working process of the internal sealing component, the steering shaft passes through the sealing felt and has an interference fit with the inner hole of the sliding ring. When the steering shaft is working, it drives the sliding ring to rotate in the housing without affecting the steering force of the steering wheel; the sliding ring plays a secondary seal.

[0032] In a further specific embodiment of the bottom cover, the outer wall of the bottom cover 8 is provided with a first card slot, the inner wall of the shell 6 is provided with a first card protrusion that cooperates with the first card slot, the outer wall of the shell 6 is provided with a second card slot, and the inner wall of the front cover 4 is provided with a second card protrusion that cooperates with the second card slot; it is easy to assemble and prevent falling off during work.

[0033] In other specific embodiments, the inner wall of the first end opening of the installation cavity is provided with a circularly extending clamping boss, and the outer wall of the bottom cover 8 is provided with a mounting groove that cooperates with the clamping boss; the bottom cover cooperates with the mounting boss through the mounting groove to improve the reliability of the installation of the two.

[0034] In a further specific embodiment, an annular sealing felt 7 is also included, and the inner wall of the bottom cover 8 forms a step structure 81 extending along the clamping boss, and the annular sealing felt 7 is located between the limiting boss 41 and the step structure 81; during installation, the steering shaft also has an interference fit with the sealing felt, which has a sealing and sound insulation effect. At the same time, the sealing felt material is relatively soft, and the sealing felt can rotate in the bottom cover without affecting the steering force of the steering wheel. The sealing felt plays a three-level sealing role.

[0035] In the specific design of the supporting boss, a first limiting protrusion for limiting the sliding ring 5 is provided at the top of the supporting boss, and a second limiting protrusion for limiting the sliding ring 5 is provided at the bottom of the limiting boss 41; a third limiting protrusion for limiting the annular sealing felt 7 is provided at the bottom of the supporting boss, and a fourth limiting protrusion for limiting the annular sealing felt 7 is provided at the top of the step structure 81; the sliding ring is limited by the first limiting protrusion and the second limiting protrusion, and the annular sealing felt is limited by the third limiting protrusion and the fourth limiting protrusion.

[0036] In a specific design of the sliding ring, the sliding ring has a K-shaped cross-section, and its inner wall cooperates with the steering shaft through two sealing lips. The first limiting protrusion and the second limiting protrusion can be respectively stuck in the gap between the sealing lips and the body.

[0037] In order to reduce the friction between the sliding ring and the housing during rotation, a preset sliding gap is provided between the outer wall of the sliding ring 5 and the inner wall of the housing 6 , and the sliding gap is filled with lubricating grease.

[0038] In the specific design of the internal sealing components, the front cover, the housing, and the bottom cover can be made of PBT material that has both strength and lubricity, and the sliding ring can be made of PA12 material that has better self-lubricity and wear resistance.

[0039] In other specific designs of the cover body, the inner radial direction of the installation cavity gradually decreases toward the inner sealing component 3 .

[0040] The cover body is made of EPDM rubber and rubber processing aids, including calcium carbonate, magnesium silicate, benzyl triphenyl phosphonium chloride and bisphenol AF; EPDM rubber has good high and low temperature resistance on the one hand, and low compression permanent deformation on the other hand, which effectively solves the sealing problem of the gasket. The rubber processing aid effectively improves the sealing, heat resistance, wear resistance and mechanical properties of the gasket matrix, and extends its service life. In the actual production process, the above-mentioned high molecular polymer and rubber processing aid are mixed and prepared evenly through a rubber mixer, and then a molding machine is used to extrude the gasket matrix preform; and then the gasket matrix preform is molded in a vulcanizing press.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-level steering column dust cover, characterized in that: include: A cover body (1), a front tail plate fixing plate (2), and an internal sealing component (3); The cover body (1) is provided with an installation cavity inside, the internal sealing component (3) is installed at the first end of the installation cavity, the outer wall of the cover body (1) is provided with an annularly extending fixing plate installation portion, the fixing plate installation portion is provided with a plurality of annular sealing ribs (12) extending around the cover body (1) on a side away from the internal sealing component (3), a mounting opening is provided in the middle of the front tail plate fixing plate (2), the front tail plate fixing plate (2) is sleeved on the outside of the cover body (1) through the mounting opening and is installed on a side of the fixing plate installation portion close to the internal sealing component (3); The internal sealing assembly (3) comprises a front cover (4), a sliding ring (5), a housing (6), and a bottom cover (8); The bottom cover (8) is located in the first end opening of the installation cavity and extends in an annular manner along the inner wall of the first end opening; the shell (6) is sleeved outside the first end of the installation cavity; the inner wall of the shell (6) is provided with a supporting boss (61); the supporting boss (61) is located above the bottom cover (8); the sliding ring (5) is located in the shell (6) and above the supporting boss (61); the front cover (4) is sleeved outside the shell (6); the inner wall of the front cover (4) is provided with a limiting boss (41) for limiting the sliding ring (5); The outer wall of the bottom cover (8) is provided with a first card slot, the inner wall of the shell (6) is provided with a first card protrusion that cooperates with the first card slot, the outer wall of the shell (6) is provided with a second card slot, and the inner wall of the front cover (4) is provided with a second card protrusion that cooperates with the second card slot.

2. The multi-level steering column dust cover according to claim 1, characterized in that: The fixing plate mounting portion is provided with a mounting boss (11) on one side facing the front tail plate fixing plate (2), and the front tail plate fixing plate (2) is provided with a mounting through hole that matches the mounting boss (11).

3. The multi-level steering column dust cover according to claim 1, characterized in that: A V-shaped buffer groove extending in an annular manner around the cover body (1) is provided on the side of the fixing plate mounting portion facing the internal sealing component (3).

4. The multi-level steering column dust cover according to claim 1, characterized in that: The inner wall of the first end opening of the installation cavity is provided with a circular extending clamping boss, and the outer wall of the bottom cover (8) is provided with a mounting groove matched with the clamping boss.

5. The multi-level steering column dust cover according to claim 4, characterized in that: It also includes an annular sealing felt (7), the inner wall of the bottom cover (8) forms a step structure (81) extending along the clamping boss, and the annular sealing felt (7) is located between the limiting boss (41) and the step structure (81).

6. The multi-level steering column dust cover according to claim 5, characterized in that: A first limiting protrusion for limiting the position of the sliding ring (5) is provided at the top of the supporting protrusion (61), and a second limiting protrusion for limiting the position of the sliding ring (5) is provided at the bottom of the limiting protrusion (41); A third limiting protrusion for limiting the position of the annular sealing felt (7) is provided at the bottom of the supporting boss (61), and a fourth limiting protrusion for limiting the position of the annular sealing felt (7) is provided at the top of the step structure (81).

7. The multi-level steering column dust cover according to claim 1, characterized in that: A preset sliding gap is provided between the outer wall of the sliding ring (5) and the inner wall of the housing (6), and the sliding gap is filled with lubricating grease.

8. The multi-level steering column dust cover according to claim 1, characterized in that: The inner radial direction of the installation cavity gradually decreases towards the inner sealing component (3).

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