Electromagnetic buffer

Abstract

A shock absorber body which makes telescopic motion in response to an input from outside has a ball screw mechanism (16) which converts the telescopic motion into rotary motion and is composed of a ball nut (17) and a screw shaft (18). A motor (32) is provided coaxially with the shock absorber body (30). The motor (32) generates electromagnetic resistance to oppose against the rotary motion which inputs into a rotary shaft (6) of the motor. A cylindrical member (1 or 23) which covers the shock absorber body (30) and the motor (32) from outside and whose part covering the motor (30) also serves as a motor frame is provided. Damping force which opposes against the telescopic motion of the shock absorber body (30) is generated according to electromagnetic force of the motor (32).

Description

technical field [0001] The invention relates to an electromagnetic buffer which converts the telescopic motion of the buffer main body into the rotary motion of the motor by using a ball screw mechanism, and attenuates the vibration by using the electromagnetic resistance generated by the motor. Background technique [0002] As a vehicle suspension device, a device in which a hydraulic shock absorber is arranged in parallel with a suspension spring between a vehicle body and an axle is known. [0003] In addition, JP-A-5-44758 discloses a device that incorporates an electromagnetic coil into a part of an oil shock absorber. The device respectively installs the coil on the hydraulic cylinder of the oil pressure buffer, installs the magnet on the piston rod, and energizes the coil to generate a driving force (electromagnetic force) along the stroke direction of the piston rod. According to the vehicle Control the amount of expansion and contraction of the suspension device. ...

AI Technical Summary

Problems solved by technology

If the temperature of the motor 50 rises further, when it exceeds the rated temperature of the motor 50, the insulating film of the wire forming the coil will undergo a chemical change due to heat, thereby deteriorating the insulation performance. danger

[0022] When enlarging the cover and the outer cylinder of the electromagnetic buffer and enlarging the space around the electric motor 50 in order to avoid damage caused by the temperature rise of the electric motor 50, interference with other components such as frames sometimes occurs, and it is difficult to apply as described above. to the vehicle, and also produces a new disadvantage of the increase in the weight of the electromagnetic buffer itself

[0023] Furthermore, when the motor 50 is used as an independent component, when the motor 50 is mounted on the electromagnetic buffer main body, the number of connecting parts such as bolts and nuts, the bracket for the motor will be increased, and the electromagnetic shock absorber will also be increased. The processing steps of the buffer have a bad influence on productivity and production cost

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