Input shaft sheath structure for automobile steering device

Abstract

The invention relates to the technical field of automobile steering devices, and discloses an input shaft sheath structure for an automobile steering device, which comprises a dust cover, and the upper end surface of the dust cover is used for being tightly matched with an automobile protection plate after being compressed; the connecting sleeve is used for being in close fit with the dustproof cover after being assembled; the shell is in interference fit with the connecting sleeve in an external pressing mode, when a vehicle wades into water, water needs to flow upwards from the matching portion of the connecting sleeve and the shell and can enter the steering gear only after passing through the end face sealing O-shaped ring, and due to the fact that the connecting sleeve and the shell are in interference fit, the water is difficult to enter and flow upwards, and the water cannot enter the steering gear after passing through the end face sealing O-shaped ring. The sealing effect of the external pressure type input shaft sheath structure is much better than that of an existing internal pressure type input shaft sheath, and the external pressure type input shaft sheath structure is favorable for avoiding the quality problem caused by corrosion due to water inflow into internal parts.

Description

Technical Field

[0001] The invention relates to the technical field of automobile steering gears, and more specifically to an input shaft sleeve structure for automobile steering gears. Background Art

[0002] The input shaft sleeve of the automobile steering gear includes a dust cover, a connecting sleeve, and an O-ring, which are used to protect the input shaft. The dust cover 102 cooperates with the automobile guard plate, and a radial O-ring is installed on the connecting sleeve. The connecting sleeve and the steering gear housing have an internal pressure interference fit. The dust cover is assembled to the connecting sleeve, and the O-ring is assembled into the groove on the connecting sleeve. The connecting sleeve is pressed into the housing hole with the matching axial surface, and an interference fit is adopted to prevent the connecting sleeve from falling off. The O-ring can prevent water from entering from the connection between the connecting sleeve and the housing. After compression, the upper end face of the dust cover is tightly matched with the automobile guard plate to play a role of dustproof and waterproof. In this way, the input shaft sleeve can protect the input shaft while also playing a role of dustproof and waterproof.

[0003] The shortcomings of the prior art: There are some problems with the existing input shaft sleeve structure: First, since the connecting sleeve and the shell are matched in an internal pressure manner, when the vehicle wades, the water flows from top to bottom, and the radial O-ring seal is mainly used to prevent the water from continuing to flow downward. If the wading amount is large, the O-ring seal is not effective, or it fails due to aging after long-term use, it is easy to cause water to enter the steering gear, thereby causing internal parts to rust and quality problems. Second, the current market has increasingly higher requirements for NVH. The input shaft sleeve is connected to the shell, and the input shaft sleeve is in contact with the car guard plate. The noise can be transmitted to the car guard plate through the input shaft sleeve, and the existing input shaft sleeve has no relevant structural design to absorb noise or prevent noise transmission. Therefore, it is necessary to provide an input shaft sleeve structure for an automobile steering gear to solve the above problems. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an input shaft sleeve structure for an automobile steering gear to solve the problems existing in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: an input shaft sleeve structure for an automobile steering gear, comprising:

[0006] Dust cover: The upper end surface of the dust cover is compressed to fit tightly with the car guard plate;

[0007] Connecting sleeve: The connecting sleeve is used to fit tightly with the dust cover after assembly;

[0008] Shell: The shell adopts external pressure type and interference fit with the connecting sleeve;

[0009] The middle part of the connecting sleeve is fixedly sleeved with an input shaft, the outer wall of the connecting sleeve is fixedly connected with a frame near the top, the outer wall of the connecting sleeve near the top is assembled with a dust cover, and the matching part is contoured, the inside of the dust cover is contoured with a frame groove near the bottom, the frame groove inside the dust cover is adapted to the frame, the inner cavity of the dust cover is filled with a sound insulation sponge, the bottom end of the dust cover is fixedly connected with a flange, and the outer wall of the bottom end of the connecting sleeve is externally pressed and interference-fitted with a shell;

[0010] Preferably, the outer contour of the sound insulation sponge is designed to imitate the inner cavity of the dust cover, an inner hole is opened in the middle of the sound insulation sponge, and the inner control in the middle of the sound insulation sponge is connected with the matching axial surface of the connecting sleeve by interference fit.

[0011] Preferably, the end face of the connecting sleeve is fixedly connected with an end face sealing O-ring, the outer wall of the end face sealing O-ring is provided with an arc protrusion structure, the arc protrusion structure provided on the outer wall of the end face sealing O-ring is made of rubber material, and the outer wall arc protrusion structure of the end face sealing O-ring is tightly fitted with the shell.

[0012] Preferably, after the connecting sleeve and the dust cover are assembled, the frame can be completely wrapped by the flange.

[0013] Preferably, a V-shaped positioning structure is fixedly connected to the bottom end of the connecting sleeve, a V-shaped groove is provided on the shell, and the V-shaped positioning structure is matched with the V-shaped groove.

[0014] Preferably, the dust cover is made of rubber, the sound insulation sponge is made of PUR, the connecting sleeve is generally made of hard plastic, the input shaft is made of steel, the end face sealing O-ring is generally made of rubber, and the shell is generally made of aluminum profile.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The present invention sets an external pressure input shaft sleeve structure. When the vehicle wades, water needs to flow upward from the matching position of the connecting sleeve and the shell, and can enter the steering gear after passing through the end face sealing O-ring. Since the connecting sleeve and the shell are interference fit, it is difficult for water to enter and flow upward, and it will be even more difficult to pass through the end face sealing O-ring that fits tightly after compression. The sealing effect of the external pressure input shaft sleeve structure of this patent will be much better than the sealing effect of the existing internal pressure input shaft sleeve, which is beneficial to avoid corrosion and quality problems caused by water ingress to internal parts.

[0017] 2. The present invention can effectively absorb noise by providing a sound insulation sponge. The sound insulation sponge is installed between the connecting sleeve and the dust cover, which can effectively absorb noise and prevent it from being transmitted to the automobile guard plate, thereby greatly reducing the noise transmitted to the automobile cab when the steering gear is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a cross-sectional view of the input shaft sleeve structure of the automobile steering gear.

[0019] Figure 2 It is an exploded view of the steering gear input shaft sleeve structure of the automobile steering gear of the present invention.

[0020] Figure 3 The present invention is a schematic structural diagram of a connecting sleeve of a steering gear input shaft sleeve of an automobile steering gear.

[0021] Figure 4 The present invention is a schematic structural diagram of the housing of the steering gear input shaft sleeve of the automobile steering gear of the present invention.

[0022] The reference numerals are: 201, input shaft; 202, dust cover; 202-1, flange; 203, sound insulation sponge; 204, connecting sleeve; 204-1, end face sealing O-ring; 204-2, skeleton; 204-3, V-shaped positioning structure; 205, housing; 205-1, V-shaped groove. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The input shaft sleeve structure for the automobile steering gear involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0024] The present invention provides an input shaft sleeve structure for an automobile steering gear, comprising:

[0025] Dust cover 202: The upper end surface of the dust cover 202 is compressed to fit tightly with the car guard plate;

[0026] Connecting sleeve 204: The connecting sleeve 204 is used to fit tightly with the dust cover 202 after assembly;

[0027] Shell 205: Shell 205 adopts external pressure type and interference fits with connecting sleeve 204;

[0028] The middle part of the connecting sleeve 204 is fixedly connected with the input shaft 201, the outer wall of the connecting sleeve 204 is fixedly connected with the frame 204-2 near the top, the outer wall of the connecting sleeve 204 near the top is assembled with the dust cover 202, and the matching parts are contoured, the inside of the dust cover 202 is contoured with a frame groove near the bottom, the frame groove inside the dust cover 202 is matched with the frame 204-2, the inner cavity of the dust cover 202 is filled with a sound insulation sponge 203, the bottom end of the dust cover 202 is fixedly connected with a flange 202-1, and the outer wall of the bottom end of the connecting sleeve 204 is externally pressed and interfered with by a shell 205 to prevent the connecting sleeve from loosening or falling off.

[0029] Furthermore, the outer contour of the sound insulation sponge 203 is designed to imitate the inner cavity of the dust cover 202, and an inner hole is opened in the middle of the sound insulation sponge 203. The inner control in the middle of the sound insulation sponge 203 and the matching axial surface of the connecting sleeve 204 are connected by interference fit, so that after the sound insulation sponge 203 is assembled, it can ensure a close fit with the dust cover 202 and the connecting sleeve 204, which can effectively prevent water from entering.

[0030] Furthermore, the end face of the connecting sleeve 204 is fixedly connected with an end face sealing O-ring 204-1, and the outer wall of the end face sealing O-ring 204-1 is provided with an arc protrusion structure. The arc protrusion structure provided on the outer wall of the end face sealing O-ring 204-1 is made of rubber material. The outer wall arc protrusion structure of the end face sealing O-ring 204-1 fits tightly with the shell 205. After assembly, the upper end face of the shell 205 compresses the arc protrusion structure to achieve a good sealing effect, which is convenient for preventing water from entering from the matching point between the connecting sleeve 204 and the shell 205, and has a certain waterproof effect.

[0031] Furthermore, after the connecting sleeve 204 and the dust cover 202 are assembled, the frame 204-2 can be completely wrapped by the flange 202-1, so as to achieve a good sealing effect at the connection between the connecting sleeve 204 and the dust cover 202, and prevent the dust cover 202 from loosening or falling off.

[0032] Furthermore, a V-shaped positioning structure 204-3 is fixedly connected to the bottom end of the connecting sleeve 204, and a V-shaped groove 205-1 is opened on the shell 205. The V-shaped positioning structure 204-3 is adapted to the V-shaped groove 205-1, so that the lower end face of the connecting sleeve 204 can be easily limited after contacting the end face of the shell boss after assembly. At this time, the skeleton 204-2 on the connecting sleeve just enters the V-shaped groove 205-1 on the shell 205, thereby achieving angular positioning and preventing the connecting sleeve from rotating in the circumferential direction.

[0033] Furthermore, the material of the dust cover 202 is rubber, the material of the sound insulation sponge 203 is PUR, the material of the connecting sleeve 204 is generally hard plastic, the material of the input shaft 201 is steel, the material of the end face sealing O-ring 204-1 is generally rubber, and the material of the shell 205 is generally aluminum profile, so that the dust cover 202, the connecting sleeve 204 and the shell 205 can cooperate closely to provide a certain waterproof and dustproof effect to the input shaft 201, thereby ensuring the use efficiency of the input shaft 201.

[0034] Working principle of the present invention: When working, the external pressure input shaft sleeve structure of the present invention, when the vehicle is wading, the water needs to flow upward from the matching position of the connecting sleeve 204 and the shell 205, and can enter the steering gear after passing through the end face sealing O-ring 204-1. Since the connecting sleeve 204 and the shell 205 are interference fit, it is difficult for water to enter and flow upward, and it will be even more difficult to pass the end face sealing O-ring 204-1 that is tightly fitted after compression. Therefore, the sealing effect of the external pressure input shaft sleeve structure of the present invention will be much better than the sealing effect of the existing internal pressure input shaft sleeve. A sound insulation sponge 203 is specially designed in the design of the present invention. The material is PUR, which can effectively absorb noise. This sound insulation sponge 203 is installed between the connecting sleeve 204 and the dust cover 202, which can effectively absorb noise and prevent it from being transmitted to the car guard plate, thereby greatly reducing the noise of the steering gear when it is working and transmitting to the car cab.

[0035] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0036] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0037] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An input shaft sleeve structure for an automobile steering gear, comprising: Dust cover (202): the upper end surface of the dust cover (202) is compressed to fit tightly with the automobile guard plate; Connecting sleeve (204): the connecting sleeve (204) is used to closely match with the dust cover (202) after being assembled; Shell (205): the shell (205) is externally pressed and has an interference fit with the connecting sleeve (204); Features: The middle part of the connecting sleeve (204) is fixedly sleeved with an input shaft (201); the outer wall of the connecting sleeve (204) is fixedly connected with a frame (204-2) near the top; the outer wall of the connecting sleeve (204) near the top is assembled with a dust cover (202), and the matching part is designed in a contoured manner; the inside of the dust cover (202) is contoured with a frame groove near the bottom; the frame groove inside the dust cover (202) is matched with the frame (204-2); the inner cavity of the dust cover (202) is filled with a sound insulation sponge (203); the bottom end of the dust cover (202) is fixedly connected with a flange (202-1); and the outer wall of the bottom end of the connecting sleeve (204) is externally press-fitted with a shell (205).

2. The input shaft sleeve structure for an automobile steering gear according to claim 1, characterized in that: The outer contour of the sound insulation sponge (203) is designed to imitate the inner cavity of the dust cover (202), and an inner hole is opened in the middle of the sound insulation sponge (203). The inner control in the middle of the sound insulation sponge (203) is connected with the matching axial surface of the connecting sleeve (204) by interference fit.

3. The input shaft sleeve structure for an automobile steering gear according to claim 1, characterized in that: The end face of the connecting sleeve (204) is fixedly connected to an end face sealing O-ring (204-1), the outer wall of the end face sealing O-ring (204-1) is provided with an arc convex structure, the arc convex structure provided on the outer wall of the end face sealing O-ring (204-1) is made of rubber material, and the arc convex structure on the outer wall of the end face sealing O-ring (204-1) is tightly fitted with the shell (205).

4. The input shaft sleeve structure for an automobile steering gear according to claim 1, characterized in that: After the connection sleeve (204) and the dust cover (202) are assembled, the frame (204-2) can be completely wrapped under the action of the flange (202-1).

5. The input shaft sleeve structure for an automobile steering gear according to claim 1, characterized in that: The bottom end of the connecting sleeve (204) is fixedly connected to a V-shaped positioning structure (204-3), a V-shaped groove (205-1) is provided on the shell (205), and the V-shaped positioning structure (204-3) is adapted to the V-shaped groove (205-1).

6. The input shaft sleeve structure for an automobile steering gear according to claim 3, characterized in that: The dust cover (202) is made of rubber, the sound insulation sponge (203) is made of PUR, the connecting sleeve (204) is generally made of hard plastic, the input shaft (201) is made of steel, the end face sealing O-ring (204-1) is generally made of rubber, and the housing (205) is generally made of aluminum profile.

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