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CN-121977063-A - Linear worm and gear assembly and motor assembly

CN121977063ACN 121977063 ACN121977063 ACN 121977063ACN-121977063-A

Abstract

The invention relates to the technical field of motors, in particular to a linear worm and gear assembly and a motor assembly, wherein the worm and gear assembly comprises a protective shell, a worm gear, a worm, a lubricating assembly, a sealing plate, a magnet rod and a handrail, the invention adopts an integrated protective shell, designs linear space layout, enables the worm gear to be vertically meshed with the axis of the worm at 90 degrees, optimizes the lead angle of the worm, realizes a unidirectional self-locking function, simultaneously takes account of transmission efficiency, the power demand of pedal lift is satisfied, and the cambered surface profile of tooth of collocation curved surface laminating combines the compound engagement mode of slip and roll combination, has reduced the contact stress of engagement face, has reduced wearing and tearing, has still add lubricated subassembly in addition, has not only realized the cyclic utilization of lubricating oil, can also avoid iron fillings fish tail flank of tooth, has further promoted driven stability, adaptation car usher's footboard installation space demand and service environment demand.

Inventors

  • LU XIONG
  • SUN CHENG
  • ZHU BING
  • LI MIN

Assignees

  • 江苏凯斯盾科技有限公司

Dates

Publication Date
20260505
Application Date
20260403

Claims (9)

  1. 1. The horizontal worm and gear assembly comprises a protective shell (1), a worm wheel (2) and a worm (3), and is characterized in that the protective shell (1) adopts an integrated structural design, the worm wheel (2) and the worm (3) are in horizontal space layout inside the protective shell (1), the worm wheel (2) is vertically meshed with the axis of the worm (3) at 90 degrees, the worm wheel (2) is arranged on a worm wheel shaft (4), and the worm (3) and the worm wheel shaft (4) are respectively connected with the side wall of the protective shell (1) in a rotating way; the lead angle of the worm (3) is 5-8 degrees, so that the worm has a unidirectional self-locking function; The spiral tooth part of the worm (3) and the tooth part of the worm wheel (2) are cambered surface tooth shapes which are in curved surface fit, and a composite meshing mode combining sliding and rolling is adopted; the meshing clearance between the worm (3) and the worm wheel (2) is 0.02mm-0.05mm; The protective shell (1) is formed by adopting aluminum alloy material through die casting, the bottom of the protective shell forms an oil storage cavity (11), the middle part of the oil storage cavity (11) is fixedly provided with an oil dividing block (12), and the section of the oil dividing block (12) is in a triangular structure with a high middle part and low two sides.
  2. 2. The in-line worm gear component of claim 1, wherein the worm wheel (2) and the worm (3) are both made of 20CrMnTi alloy steel, tooth surfaces are subjected to carburizing, quenching and finish grinding treatment, and non-tooth surfaces are subjected to blackening treatment to form an oxidation protection layer, so that the in-line worm gear component has rust and corrosion resistance.
  3. 3. The in-line worm and gear assembly according to claim 1, wherein the lead angle of the worm (3) is 6 degrees, and the stable one-way self-locking and high-efficiency transmission performance are achieved, so that the in-line worm and gear assembly is suitable for heavy load and jolt operation of an automobile welcome pedal.
  4. 4. The linear worm and gear assembly according to claim 1, wherein the worm (3) is further provided with a lubrication assembly (5), the lubrication assembly (5) comprises oil pumping units (51) symmetrically arranged on the worm (3), a stop block (52) is fixedly arranged on the inner side wall of the protective shell (1) and positioned in the stroke of the oil pumping units (51), an arc-shaped guide plate (53) is fixedly arranged on the inner side wall of the protective shell (1) above the stop block (52), an oil feeding plate (54) is arranged below the tail end of the arc-shaped guide plate (53), a cross rod (55) is fixedly arranged on the side wall of the oil feeding plate (54), and the end of the cross rod (55) is fixedly connected to the inner wall of the protective shell (1).
  5. 5. The linear worm and gear assembly as set forth in claim 4, wherein the oil pumping unit (51) comprises a linkage disc (511) fixedly mounted on the worm (3), a rod handle (512) is uniformly arranged on the outer side wall of the linkage disc (511) along the circumferential direction of the linkage disc, an oil pumping spoon (513) is fixedly mounted at the end, far away from the linkage disc (511), of the rod handle (512), and side baffles (514) are symmetrically arranged on two sides of the oil pumping spoon (513).
  6. 6. The horizontal worm gear assembly as set forth in claim 5, wherein a notch is formed in the middle of the end of the oil lifting spoon (513), a scraper (5131) is disposed at the bottom of the notch in a matched manner, and the scraper (5131) is made of high-elasticity stainless steel materials.
  7. 7. The linear worm and gear assembly as set forth in claim 4, wherein the oil feeding plate (54) has an L-shaped cross section and a downward concave arc-shaped lower cross plate, and the oil feeding plate (54) is arranged in a gradually downward inclined state from the end close to the oil lifting spoon (513) to the end close to the worm gear (2).
  8. 8. The linear worm and gear assembly according to claim 1, wherein the side wall of the protective housing (1) is provided with a cleaning groove, a sealing plate (6) is arranged in the cleaning groove, a magnet rod (7) is arranged on the inner side wall of the sealing plate (6), the magnet rod (7) extends into the protective housing (1), and a handrail (8) is fixedly arranged on the outer side wall of the sealing plate (6); The circumferential side wall of the magnet rod (7) is uniformly provided with grooves (71) which are convenient for accommodating scrap iron in lubricating oil liquid.
  9. 9. An electric motor assembly comprising the in-line worm gear assembly of any one of claims 1-8.

Description

Linear worm and gear assembly and motor assembly Technical Field The invention relates to the technical field of motors, in particular to a linear worm and gear assembly and a motor assembly. Background The worm and gear assembly is an indispensable speed reduction transmission structure in the field of mechanical transmission, and is widely applied to a plurality of fields of automobile parts, engineering machinery, precise instruments, automation equipment and the like by virtue of the core advantages of compact structure, large transmission ratio, stable operation, low noise and the like. The automobile welcome pedal is used as an important auxiliary component for improving automobile riding experience and convenience, the power core of lifting action of the automobile welcome pedal is derived from the motor assembly, and power transmission is completed by completely relying on the worm and gear assembly. The motor assembly is used as a power output source of the whole automobile welcome pedal lifting system and mainly comprises a stator, a rotor, a speed reducer, a control module and a wiring terminal, wherein the speed reducer is cooperated with a worm and gear assembly, the control module and the wiring terminal have the core functions of converting electric energy into mechanical energy and providing stable and controllable driving force for lifting the automobile welcome pedal. When the automobile welcome pedal is used, the motor assembly needs to be matched with the power and torque parameters of the adaption, the output high-low speed torque and the output rotating speed of the motor assembly need to be accurately allocated through the worm and gear assembly, and further the stable and powerful lifting action of the pedal is ensured, the pedal is smoothly started and stopped, meanwhile, the pedal is matched with the pedal rhythm and force of a human body, and the problem of clamping or insufficient power is avoided. In the use process of the automobile welcome pedal, the weight of a human body and the weight of the pedal per se need to be borne for a long time, the automobile pedal belongs to a typical heavy-load working condition, continuous vibration can be generated in the running process of the automobile, the automobile pedal belongs to a jolt working condition, and in addition, the welcome pedal needs to be started and stopped frequently according to the demands of drivers and passengers, so that the worm and gear assembly and the motor assembly are required to work cooperatively. The motor assembly has reliable start-stop, dustproof and waterproof performance, stable power output and good vibration resistance, is adapted to the complex working environment of the bottom of the automobile body, the control module of the motor assembly needs to accurately respond to the operation instruction of drivers and passengers to realize the accurate control of lifting of the automobile pedals, the motor assembly is matched with the self-locking function of the worm and gear assembly to prevent the pedals from being accidentally stuck or falling back in the lifting process, and the worm and gear assembly not only has stable transmission performance, but also has reliable self-locking safety, long-acting lubrication reliability and excellent rust prevention and corrosion resistance, and the control module and the worm and gear assembly are efficiently matched to ensure that the automobile welcome pedals have no faults and potential safety hazards in the long-term use process, thereby improving the use experience of the drivers and passengers. At present, the existing worm and gear assembly applied to the automobile welcome pedal mostly adopts a split type protective shell design, the bolt connection part of the worm and gear assembly is easy to loosen in the long-term jolt vibration process of the automobile, a gap is formed at the connection part of a shell, on one hand, a transmission gap between a worm wheel and a worm is enlarged, and further transmission abnormal sound, clamping or even clamping stagnation phenomena occur, the lifting smoothness of the pedal is affected, on the other hand, the gap can lead to leakage of internal lubricating oil, and impurities such as external dust, water vapor and the like enter the shell to pollute the lubricating oil. Disclosure of Invention According to the linear worm and gear assembly and the motor assembly, the linear worm and gear assembly adopts the integrated protective shell, the linear space layout is designed, so that the worm wheel and the worm axis are vertically meshed at 90 degrees, the worm lead angle is optimized, the unidirectional self-locking function is realized, meanwhile, the transmission efficiency is considered, the power requirement of pedal lifting is met, the cambered tooth profile of curved surface lamination is matched, the sliding and rolling combined composite meshing mode is combined, the contact stress of a meshing surface is redu