Reducer of electronic power steering apparatus

Abstract

One embodiment of the invention discloses a reducer for an electronic power steering apparatus, which includes a gear housing including a worm shaft housing and a worm wheel housing, the gear housing being made of a heat conductive material, a worm wheel shaft connected to a steering shaft to rotate along with rotation of the steering shaft, a worm wheel accommodated in the worm wheel housing, and having a first surface and a second surface facing the first surface, the worm wheel shaft being coupled to the worm wheel, a first heat transfer plate provided to come into contact with the first surface of the worm wheel, and a first bearing coupled to the worm wheel shaft to come into contact with the first heat transfer plate, and having an outer peripheral surface coming into contact with the worm wheel housing.

Description

technical field [0001] The present invention relates to an electric power steering device, and more specifically, relates to a speed reducer of the electric power steering device with improved heat dissipation performance. Background technique [0002] figure 1 It is a configuration diagram of a common electric power steering device. [0003] refer to figure 1 , the common electric power steering device 100 includes: a steering wheel 102, which is arranged on the driver's seat; a steering shaft 106, which is connected to the steering wheel; a steering column 130, which can fix the steering shaft to the vehicle body; a rack and pinion mechanism 110, which includes A rack and pinion for converting rotational force received by the steering shaft 106 into linear motion; and a rack bar 112 having connecting rods 122 and joint arms 124 at both ends of the rack bar 112 . [0004] Steering column 130 is configured such that steering shaft 106 on one side thereof is connected to a...

AI Technical Summary

Problems solved by technology

[0015] However, the existing electric power steering apparatus uses the worm shaft and the worm gear due to its characteristics, so in the case of high-speed steering of the vehicle, especially when parking with much load applied, when the worm shaft and the worm gear are used according to the generated When the high-speed rotation of the motor that powers the steering rotates at a high speed, frictional heat may be generated due to the contact between the gear teeth

Therefore, there is a structural limit that the heat generated by the worm shaft and the worm wheel accommodated inside the gear housing accumulates inside the gear housing

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