A worm assembly
By installing a shock-absorbing mechanism and a limiting ring rib on the worm gear, the problems of abnormal noise and motor burnout caused by worm gear movement were solved, achieving stable operation of the worm gear assembly and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUHU STERLING STEERING SYST
- Filing Date
- 2022-12-31
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional worm gear structures are prone to abnormal noise due to axial movement during use, and the motor is prone to burnout under heavy loads, lacking effective limiting devices.
A worm gear assembly was designed, which includes a shock-absorbing mechanism on the worm gear, comprising a shock-absorbing shell and a shock-absorbing pad, and limiting ring ribs at both ends of the worm gear. The shock-absorbing mechanism and limiting ring ribs prevent the worm gear from moving around. The connecting plate achieves a stable connection through a spline groove and a connecting sleeve.
It effectively reduces noise caused by worm gear movement, improves the worm gear's axial buffering and limiting capabilities, prevents the motor from burning out due to excessive load, and extends its service life.
Smart Images
Figure CN115892197B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electric power steering technology, specifically a worm gear assembly. Background Technology
[0002] Typically, most cars use electric power steering systems.
[0003] This electric power steering system is based on the ECU controller controlling the rotation of the EPS motor according to the changes in torque and angle signals collected from the sensors. The EPS motor drives the worm gear and worm reduction mechanism to provide the assistance required for vehicle steering, thereby improving the vehicle's steering performance.
[0004] In other words, the EPS steering system is used to improve the vehicle's stability by using a separate EPS motor to assist in steering.
[0005] In traditional structures, the EPS motor is directly connected to the drive worm gear and worm, for example, patent: 201811553994.4 - Axial adjustment device for electric four-way adjustable steering column.
[0006] While traditional connection methods can achieve smooth power transmission, the connection point is prone to abnormal noise due to the movement of the worm gear. At the same time, when the load is large, the motor is prone to burnout due to excessive load.
[0007] Meanwhile, traditional worm gears lack limiting devices, making them prone to axial movement during use.
[0008] Therefore, in order to improve at least one of the above problems, it is necessary to optimize the design of the existing worm gear structure. Summary of the Invention
[0009] The purpose of this invention is to provide a worm gear assembly structure with axial limiting and buffering capabilities.
[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0011] A worm gear assembly includes a worm gear with a shock-absorbing mechanism; the shock-absorbing mechanism includes a shock-absorbing housing with a shock-absorbing pad inside the housing.
[0012] Two damping mechanisms are provided on the worm gear, and the two damping mechanisms are distributed opposite to each other on the worm gear.
[0013] Each of the aforementioned damping mechanisms comprises two opposing single-unit housings arranged on either side of the damping pad.
[0014] The single-unit housing includes a shock-absorbing end plate, a shock-absorbing ring plate is provided on the shock-absorbing end plate, and a through hole is also provided on the shock-absorbing end plate; the shock-absorbing end plate is sleeved on the worm gear through the through hole.
[0015] The shock-absorbing end plate is provided with a support sleeve; the support sleeve is arranged coaxially with the through hole; the support sleeve is arranged inside the shock-absorbing ring plate.
[0016] The worm gear is provided with a limiting ring rib for limiting the position of the shock absorption mechanism.
[0017] The worm gear end is provided with a connecting plate, the connecting plate includes a plate body, and the plate body is provided with a worm gear connecting part and a drive connecting part;
[0018] The worm gear connection includes a first connecting sleeve disposed on the disk body; the first connecting sleeve is provided with a first spline groove.
[0019] The drive connection part includes a second connecting sleeve disposed on the disk body; the second connecting sleeve is provided with a second spline groove.
[0020] The first connecting sleeve and the second connecting sleeve are coaxially distributed; the first connecting sleeve is connected to the second connecting sleeve through a disc body.
[0021] The disk body includes an outer disk body, on which a bridging plate body is provided, and the first connecting sleeve is disposed on the bridging plate body; the second connecting sleeve is connected to the outer disk body through a connecting plate.
[0022] The disc body is provided with a clearance groove, and the second connecting sleeve is arranged inside the clearance groove.
[0023] The first and second connecting sleeves are equipped with clamps.
[0024] The advantages of this invention are:
[0025] This invention discloses a worm gear assembly. By setting a shock absorption mechanism, the worm gear assembly has a good axial buffering capacity. Furthermore, the shock absorption mechanism of this invention also has a good lateral limiting capacity, avoiding or reducing the noise generated by the axial movement and motion movement of the worm gear assembly. Attached Figure Description
[0026] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:
[0027] Figure 1 This is a schematic diagram of the structure of the present invention.
[0028] Figure 2 This is a structural schematic diagram from a second perspective of the present invention.
[0029] Figure 3This is a schematic diagram of the worm gear structure in this invention.
[0030] Figure 4 This is a schematic diagram of the shock absorption mechanism in this invention.
[0031] Figure 5 This is a schematic diagram of the structure of the shock absorption mechanism in this invention after removing one side of the single-unit shell.
[0032] Figure 6 This is a schematic diagram of the structure of the single-unit shell in this invention.
[0033] Figure 7 This is a schematic diagram of the connecting disk from a first-view perspective in this invention.
[0034] Figure 8 This is a schematic diagram of the connecting disk from a second perspective in this invention.
[0035] Figure 9 This is a schematic diagram of the connecting disk from a third-view perspective in this invention.
[0036] Figure 10 This is a schematic diagram of the fourth perspective of the connecting disk in this invention.
[0037] Figure 11 This is a schematic diagram of the first view of the connecting disc after it is equipped with a clamp in this invention.
[0038] Figure 12 This is a second-view structural schematic diagram of the connecting disc after it has been fitted with a clamp in this invention.
[0039] Figure 13 This is a schematic diagram of the clamp structure in this invention.
[0040] The markings in the above figures are all:
[0041] 1. Connecting disc; 11. First connecting sleeve; 12. Second connecting sleeve; 13. Disc body; 14. Bridging plate body; 15. Connecting plate; 16. Connecting ring plate; 17. Clearance groove; 18. Clamp; 2. Worm gear; 21. Limiting ring rib; 3. Vibration damping mechanism; 3-1. Vibration damping shell; 3-2. Vibration damping pad; 31. Single shell; 311. Vibration damping end plate; 312. Through hole; 313. Vibration damping ring plate; 314. Support sleeve. Detailed Implementation
[0042] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.
[0043] A worm gear assembly includes a worm 2, on which a shock-absorbing mechanism 3 is provided; the shock-absorbing mechanism 3 includes a shock-absorbing shell 3-1, and a shock-absorbing pad 3-2 is provided inside the shock-absorbing shell 3-1; the present invention discloses a worm gear assembly, which, through the setting of the shock-absorbing mechanism 3, enables the worm gear assembly to have good axial buffering capacity, and the shock-absorbing mechanism 3 of the present invention also has good lateral limiting capacity, avoiding or reducing the noise generated by the axial movement and movement of the worm gear assembly.
[0044] The worm gear assembly disclosed in this invention, through the setting of the shock absorption mechanism 3, enables the worm gear assembly to have axial limiting capability, thereby preventing the worm 2 from axially moving. In addition, in this invention, the shock absorption mechanism 3 includes a shock absorption shell 3-1. The setting of the shock absorption shell 3-1 ensures the strength of the shock absorption mechanism 3 and facilitates the arrangement of the shock absorption pad 3-2. The shock absorption pad 3-2 not only plays a shock absorption role, but also plays a good buffering role, preventing the worm 2 from colliding with adjacent components and generating noise due to its axial movement tendency.
[0045] Furthermore, in this invention, two damping mechanisms 3 are provided on the worm 2, and the two damping mechanisms 3 are distributed opposite to each other on the worm 2. By providing two damping mechanisms 3, the invention can realize the limiting operation of the worm 2 at both ends, ensuring the smooth operation of the worm 2. In addition, providing two damping mechanisms 3 and arranging them at both ends of the worm 2 facilitates the subsequent positioning of the damping mechanisms 3 in conjunction with the limiting ring rib 21 on the worm 2, while preventing axial movement of the worm 2.
[0046] In this invention, the worm gear 2 is provided with a limiting ring rib 21 for limiting the position of the shock absorption mechanism 3; the outer diameter of the limiting ring rib 21 is larger than the inner diameter of the through hole 312; this effectively prevents the shock absorption mechanism 3 from moving along the axial direction of the worm gear 2 past the limiting ring rib 21.
[0047] Furthermore, in this invention, each shock-absorbing shell 3-1 in the shock-absorbing mechanism 3 includes two oppositely arranged single shells 31, which are arranged on both sides of the shock-absorbing pad 3-2. This arrangement facilitates the installation of the shock-absorbing pad 3-2 within the shock-absorbing shell 3-1. At the same time, the compression fit of the two shock-absorbing shells 3-1 can effectively ensure the stability of the installation of the shock-absorbing pad 3-2.
[0048] Furthermore, in this invention, the single-unit housing 31 includes a shock-absorbing end plate 311, on which a shock-absorbing ring plate 313 is provided, and a through hole 312 is also provided. In actual arrangement, the shock-absorbing end plate 311 is sleeved on the worm gear 2 through the through hole 312, and the shock-absorbing end plate 311 is arranged perpendicular to the central axis of the worm gear 2. In addition, the shock-absorbing end plate 311 in this invention is provided with a shock-absorbing ring plate 313, which is a circular ring structure. In subsequent use, the shock-absorbing ring plate 313 is sleeved on the outside of the shock-absorbing pad 3-2, which is equivalent to binding the outside of the shock-absorbing pad 3-2, thereby better ensuring the arrangement of the shock-absorbing pad 3-2 inside the shock-absorbing housing 3-1.
[0049] Furthermore, in this invention, a support sleeve 314 is provided on the damping end plate 311; the support sleeve 314 is coaxially arranged with the through hole 312; the support sleeve 314 is arranged inside the damping ring plate 313; the provision of the support sleeve 314 is equivalent to increasing the contact surface between the damping shell 3-1 and the worm gear 2, ensuring the stability of the damping shell 3-1 arranged on the worm gear 2. In addition, the support sleeve 314 is equivalent to being inserted into the inner hole of the damping pad 3-2, which can facilitate the internal support of the damping pad 3-2 and facilitate the individual manufacturing of the damping mechanism 3.
[0050] Furthermore, in this invention, the worm 2 is provided with a connecting disk 1 at its end, including a disk body 13. The disk body 13 is provided with a worm 2 connecting part and a drive connecting part. The connecting disk 1 disclosed in this invention can realize the connection between the drive part and the worm 2. The connecting disk 1 disclosed in this invention mainly plays a bridging role, which facilitates the connection between the drive motor and the worm 2. At the same time, the connecting disk 1 also plays a transmission role, which facilitates the transmission of the drive force of the drive motor to the worm 2.
[0051] The connecting disk 1 disclosed in this invention mainly includes a disk body 13, which is a cylindrical structure and serves as the main structure of the connecting disk 1. In addition, the disk body 13 is provided with a worm gear 2 connecting part and a drive connecting part. The worm gear 2 connecting part facilitates the connection between the connecting disk 1 and the worm gear 2. Furthermore, the drive connecting part facilitates the connection between the connecting disk 1 and the drive part.
[0052] Specifically, in this invention, the worm gear 2 connecting part includes a first connecting sleeve 11 disposed on the disk body 13; the first connecting sleeve 11 is a sleeve structure, and a first spline groove 111 is provided in the first connecting sleeve 11; a spline is provided at the end of the worm gear 2 to cooperate with the first spline groove 111 in the first connecting sleeve 11. This design facilitates the connection between the worm gear 2 and the connecting disk 1. In addition, in this invention, the drive connecting part includes a second connecting sleeve 12 disposed on the disk body 13; a second spline groove 121 is provided in the second connecting sleeve 12; a spline is also provided on the output shaft of the drive motor. This design facilitates the connection between the drive motor and the connecting disk 1.
[0053] Furthermore, in this invention, the first connecting sleeve 11 and the second connecting sleeve 12 are coaxially distributed; the first connecting sleeve 11 is connected to the second connecting sleeve 12 through the disc body 13; the coaxial arrangement of the first connecting sleeve 11 and the second connecting sleeve 12 in this invention ensures normal power transmission. In addition, in this invention, the first connecting sleeve 11 and the second connecting sleeve 12 are not directly connected, but are connected through the disc body 13. This connection method not only ensures normal power transmission, but also controls the load-bearing capacity of the disc body 13, that is, controls the force on the disc body 13, the first connecting sleeve 11, and the second connecting sleeve 12. When the transmission torque is large, the connecting disc 1 breaks, thereby disconnecting the power transmission and playing a good protective role; ensuring the service life of the worm gear 2.
[0054] Furthermore, in this invention, the worm gear 2 connecting part includes a bridging plate 14 disposed on the disc body 13. The bridging plate 14 facilitates the connection of the first connecting sleeve 11 to the disc body 13. In addition, in this invention, the bridging plate 14 is arranged on one end face of the disc body 13, and the first connecting sleeve 11 is disposed on the bridging plate 14. The first connecting sleeve 11 is connected to the disc body 13 through the bridging plate 14. The first connecting sleeve 11 is perpendicular to the bridging plate 14, which helps to ensure the coaxiality of the disc body 13 and the first connecting sleeve 11.
[0055] Furthermore, the drive connection part in this invention includes a connecting plate 15 disposed on the disk body 13. The connection plate 15 facilitates the communication between the second connecting sleeve 12 and the inner wall of the disk body 13. In addition, in this invention, the second connecting sleeve 12 is connected to the disk body 13 through the connecting plate 15. The connection plate 15 plays a good bridging role, which facilitates the installation and arrangement of the second connecting sleeve 12 on the disk body 13. At the same time, the connection plate 15 ensures the coaxial arrangement of the second connecting sleeve 12 and the disk body 13.
[0056] Furthermore, in this invention, the bridging plate 14 and the connecting plate 15 are spaced apart. Based on this arrangement, it can be understood that the first connecting sleeve 11 and the second connecting sleeve 12 are not directly connected. Thus, during subsequent power transmission, the first connecting sleeve 11 and the second connecting sleeve 12 do not directly transmit power, but instead transmit power through the disc 13. By designing the load or torque that the disc 13, the first connecting sleeve 11, and the second connecting sleeve 12 themselves or their connection points can withstand, the connecting disc 1 can be damaged if the torque is too large, thereby disconnecting the power transmission.
[0057] Furthermore, in this invention, the disc 13 includes an outer disc 131 and an inner disc 132. The outer disc 131 and the inner disc 132 are connected and arranged coaxially. In actual arrangement, the outer disc 131 and the inner disc 132 are spaced apart. This arrangement can reduce the strength of the disc 13, facilitate the normal use of the subsequent connecting disc 1, and achieve disconnection during power use. In specific implementation, the outer disc 131 and the inner disc 132 are coaxially spaced apart, with the inner disc 132 located inside the outer disc 131. To ensure the connection between the inner disc 132 and the outer disc 131, this invention requires that the inner disc 132 and the outer disc 131 be connected through an outer plate 133. The outer plate 133 plays a good bridging role, ensuring the integrity of the inner disc 132 and the outer disc 131.
[0058] Furthermore, in this invention, the disc body 13 is provided with an avoidance groove 17, and the second connecting sleeve 12 is inserted into the avoidance groove 17; the avoidance groove 17 is provided on the inner disc body 132 of the disc body 13; in this invention, the avoidance groove 17 forms a groove structure on the disc body 13. In actual arrangement, the end of the second connecting sleeve 12 is essentially inserted into the avoidance groove 17, reducing or avoiding the second connecting sleeve 12 being exposed outside the disc body 13, and reducing the lateral space occupied by the connecting disc 1.
[0059] Furthermore, the outer disc 131 described in this invention is provided with a material reduction groove 13-1; the material reduction groove 13-1 plays a good role in reducing weight, while reducing the production cost of the connecting plate. More importantly, it plays a good role in reducing the structural strength of the disc 13 in the future, making it easier to disconnect the disc 13 and transmit power if it breaks.
[0060] Furthermore, in this invention, clamps 18 are fitted onto the first connecting sleeve 11 and the second connecting sleeve 12. The clamps 18 facilitate the binding of the first connecting sleeve 11 and the second connecting sleeve 12, thereby ensuring the stability of the connection between the first connecting sleeve 11 and the worm gear 2, and between the drive unit and the second connecting sleeve 12. Additionally, this invention requires that the clamp 18 include a snap-fit ring plate 181, on which a material-breaking groove 182 is provided. The material-breaking groove 182 in this invention gives the clamp 18 a large deformation capacity, facilitating subsequent binding to the outside of the first connecting sleeve 11 or the second connecting sleeve 12 as needed; it also facilitates the arrangement and placement of the clamp 18. Furthermore, in this invention, the material-breaking groove 182 is V-shaped. This design gives the snap-fit ring plate 181 a self-limiting capability, thereby preventing the ends of the snap-fit ring plate 181 around the material-breaking groove 182 from shifting.
[0061] Furthermore, in this invention, the second connecting sleeve 12 is connected to the connecting plate 15 via a connecting ring plate 16. In this invention, the connecting ring plate 16 plays a good bridging role. In actual connection, the second connecting sleeve 12 is connected to the connecting plate 15 via the connecting ring plate 16. The outer diameter of the connecting ring plate 16 is larger than the outer diameter of the second connecting sleeve 12. This arrangement makes the connecting ring plate 16 and the second connecting sleeve 12 form a stepped structure, which facilitates the positioning during subsequent clamp arrangement and also greatly increases the strength of the connection between the second connecting sleeve 12 and the connecting plate 15.
[0062] Furthermore, in this invention, the first connecting sleeve 11 and the second connecting sleeve 12 are provided with a plurality of elastic grooves 1-2; each elastic groove 1-2 on the first connecting sleeve 11 or the second connecting sleeve 12 is evenly distributed in a ring; the setting of the elastic grooves 1-2 enables the first connecting sleeve 11 and the second connecting sleeve 12 to have a certain deformation capability, which facilitates the subsequent installation and fixing of the clamp 18.
[0063] Furthermore, the bridging plate 14 in this invention is provided with force-sharing grooves 141; each force-sharing groove 141 is connected to at least one elastic groove 1-2 on the first connecting sleeve 11; the provision of force-sharing grooves 141 enables the bridging plate 14 to have a certain deformation capability; and facilitates the insertion of the worm gear 2 into the first connecting sleeve 11.
[0064] In practice:
[0065] The worm gear 2 is connected to the disc body 13 via the first connecting sleeve 11, and the drive motor in the drive unit is connected to the second connecting sleeve 12 via the output shaft. In use, the drive motor drives the second connecting sleeve 12 to rotate, the second connecting sleeve 12 drives the disc body 13 to rotate, the disc body 13 drives the first connecting sleeve 11 to rotate, and the first connecting sleeve 11 drives the worm gear 2 to rotate. When the transmission torque is large, the connecting disc breaks, cutting off the power transmission.
[0066] Obviously, the specific implementation of this invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.
Claims
1. A worm assembly, characterized by, Includes a worm gear, on which a shock-absorbing mechanism is provided; The end of the worm (2) is provided with a connecting plate (1), which is used to connect the drive motor and the worm (2). The damping mechanism (3) includes a damping shell (3-1) and a damping pad (3-2) disposed inside the damping shell (3-1); the worm (2) is provided with a limiting ring rib (21) for limiting the axial position of the damping mechanism (3); the damping shell (3-1) is sleeved on the worm (2) and abuts against one side of the limiting ring rib (21); the damping shell (3-1) includes two oppositely arranged, detachably connected single shells (31), and the two single shells (31) clamp the damping pad (3-2) between them; The connecting disc (1) includes a disc body (13), on which a first connecting sleeve (11) and a second connecting sleeve (12) are coaxially provided. The first connecting sleeve (11) is used to connect the worm gear (2), and the second connecting sleeve (12) is used to connect the drive motor. The first connecting sleeve (11) is connected to one side end face of the outer disk body (131) of the disk body (13) through the bridging plate body (14); The second connecting sleeve (12) is connected to the inner side of the outer disk body (131) through the connecting plate (15), and the bridging plate body and the connecting plate are spaced apart; the bridging plate body (14) and the connecting plate (15) are offset from each other in the axial direction; By controlling the force on the disc body, the first connecting sleeve, and the second connecting sleeve; By designing the load or torque that the disk body, the first connecting sleeve, and the second connecting sleeve themselves or their connection points can withstand; When the transmission torque is large, the connecting disc can break, thereby disconnecting the power transmission. A clamp (18) is fitted on the first connecting sleeve (11) and / or the second connecting sleeve (12), and the clamp (18) includes a snap ring plate (181) with a material breaking groove (182). The material break groove (182) is V-shaped and is used to provide a self-limiting function when tightened to prevent the end of the material break groove around the snap ring plate from shifting. The first connecting sleeve and the second connecting sleeve are provided with a plurality of elastic grooves; each elastic groove on the first connecting sleeve or the second connecting sleeve is evenly spaced in a ring; the bridging plate is provided with a force-sharing groove; each force-sharing groove is connected to at least one elastic groove on the first connecting sleeve.
2. A worm assembly according to claim 1, wherein Two damping mechanisms are provided on the worm gear, and the two damping mechanisms are distributed opposite to each other on the worm gear.
3. A worm assembly according to claim 1, wherein The single-unit housing includes a shock-absorbing end plate, a shock-absorbing ring plate is provided on the shock-absorbing end plate, and a through hole is also provided on the shock-absorbing end plate; the shock-absorbing end plate is sleeved on the worm gear through the through hole.
4. A worm assembly according to claim 3, wherein The shock-absorbing end plate is provided with a support sleeve; the support sleeve is arranged coaxially with the through hole; the support sleeve is arranged inside the shock-absorbing ring plate.