US 10,829,134 B2Granted

Permanent magnet retarder

OwnerXiangdong Wang, Liping Zhouinventors

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Abstract

A permanent magnet retarder comprises a housing and a cylinder. The cylinder (2) is inserted into the housing (1) and can move up and down relative to the housing (1). The housing (1) is further provided with a conductor (3) and a permanent magnet (4) therein which are disposed oppositely and constitute a permanent magnet eddy current deceleration assembly. The conductor (3) is fixedly disposed on an inner wall of the housing (1) and the permanent magnet (4) is fixedly disposed on the cylinder (2); alternatively, the conductor (3) is fixedly disposed on the cylinder (2) and the permanent magnet (4) is fixedly disposed on the inner wall of the housing (1). The housing (1) is further provided with an upper return permanent magnet (5) and a lower return permanent magnet (6) therein disposed oppositely.

Claims9

Dependent claims

A permanent magnet retarder, comprising a housing and a cylinder;

wherein the cylinder is inserted into the housing and movable relative to the housing;
the housing is further provided with a conductor and a permanent magnet therein which are disposed oppositely and constitute a permanent magnet eddy current deceleration assembly;
the conductor is fixedly disposed on an inner wall of the housing and the permanent magnet is fixedly disposed on the cylinder;
alternatively, the conductor is fixedly disposed on the cylinder and the permanent magnet is fixedly disposed on the inner wall of the housing;
when relative motion occurs between the cylinder and the housing, relative motion occurs between the conductor and the permanent magnet;
the conductor cuts a magnetic line of force of the permanent magnet and generates eddy current on the conductor, and an induced magnetic field is generated by the eddy current for hindering the relative motion between the housing and the cylinder;
the housing is further provided with an upper return permanent magnet and a lower return permanent magnet therein disposed oppositely;
and attraction or repulsion generated between the upper return permanent magnet and the lower return permanent magnet make the cylinder return to an initial position automatically;
a supporting seat is fixedly disposed on the inner wall of the housing;
the supporting seat is positioned on a lower part of the housing and the cylinder penetrates through the supporting seat and moves down;
the lower return permanent magnet is fixedly disposed on the supporting seat, while the upper return permanent magnet is disposed on the cylinder relative to the lower return permanent magnet and movable along with the cylinder;
when the cylinder moves down, the upper return permanent magnet is close to the lower return permanent magnet so that a repulsion generated between the upper return permanent magnet and the lower return permanent magnet is increased, thereby increasing downward resistance of the cylinder;
and the repulsion generated between the upper return permanent magnet and the lower return permanent magnet enables the cylinder to return to the initial position.

10 more elements

A permanent magnet retarder, comprising a housing and a cylinder;

wherein the cylinder is inserted into the housing and movable relative to the housing;
the housing is further provided with a conductor and a permanent magnet therein which are disposed oppositely and constitute a permanent magnet eddy current deceleration assembly;
the conductor is fixedly disposed on an inner wall of the housing and the permanent magnet is fixedly disposed on the cylinder;
alternatively, the conductor is fixedly disposed on the cylinder and the permanent magnet is fixedly disposed on the inner wall of the housing;
when relative motion occurs between the cylinder and the housing, relative motion occurs between the conductor and the permanent magnet;
the conductor cuts a magnetic line of force of the permanent magnet and generates eddy current on the conductor, and an induced magnetic field is generated by the eddy current for hindering the relative motion between the housing and the cylinder;
the housing is further provided with an upper return permanent magnet and a lower return permanent magnet therein disposed oppositely;
and attraction or repulsion generated between the upper return permanent magnet and the lower return permanent magnet make the cylinder return to an initial position automatically;
wherein the lower return permanent magnet is fixedly disposed on the inner wall of the housing;
the upper return permanent magnet is disposed on the cylinder relative to the lower return permanent magnet and movable along with the cylinder;
when the cylinder moves down, the upper return permanent magnet is close to the lower return permanent magnet so that a repulsion generated between the upper return permanent magnet and the lower return permanent magnet is increased, thereby increasing downward resistance of the cylinder;
and the repulsion generated between the upper return permanent magnet and the lower return permanent magnet enables the cylinder to return to the initial position.

9 more elements

A permanent magnet retarder, comprising a housing and a cylinder;

wherein the cylinder is inserted into the housing and movable relative to the housing;
the housing is further provided with a conductor and a permanent magnet therein which are disposed oppositely and constitute a permanent magnet eddy current deceleration assembly;
the conductor is fixedly disposed on an inner wall of the housing and the permanent magnet is fixedly disposed on the cylinder;
alternatively, the conductor is fixedly disposed on the cylinder and the permanent magnet is fixedly disposed on the inner wall of the housing;
when relative motion occurs between the cylinder and the housing, relative motion occurs between the conductor and the permanent magnet;
the conductor cuts a magnetic line of force of the permanent magnet and generates eddy current on the conductor, and an induced magnetic field is generated by the eddy current for hindering the relative motion between the housing and the cylinder;
the housing is further provided with an upper return permanent magnet and a lower return permanent magnet therein disposed oppositely;
and attraction or repulsion generated between the upper return permanent magnet and the lower return permanent magnet make the cylinder return to an initial position automatically;
wherein the lower return permanent magnet is fixedly disposed on the bottom of the housing;
the upper return permanent magnet is disposed on the bottom end of the cylinder relative to the lower return permanent magnet and movable along with the cylinder;
when the cylinder moves down, the upper return permanent magnet is close to the lower return permanent magnet so that a repulsion generated between the upper return permanent magnet and the lower return permanent magnet is increased, thereby increasing downward resistance of the cylinder;
and the repulsion generated between the upper return permanent magnet and the lower return permanent magnet enables the cylinder to return to the initial position.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/993,563Filed 30 May 2018 · continuation
Priority: CN 2015 1 08642621 Dec 2015
Published: US 2018/0273059 A127 Sep 2018
Granted: 10 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B61K 7/02
Railway stops fixed to permanent way; Track brakes or retarding apparatus fixed to permanent way; Sand tracks or the like: track brakes or…
B60L 7/26
With additional mechanical or electromagnetic braking: controlling the braking effect
B60W 10/196
Including control of braking systems: acting within the driveline, e.g. retarders
B61L 17/026
Details, e.g. indicating degree of track filling: brake devices