CN100426638C - Eddy current type reduction gear - Google Patents
Eddy current type reduction gear Download PDFInfo
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- CN100426638C CN100426638C CNB2004800137121A CN200480013712A CN100426638C CN 100426638 C CN100426638 C CN 100426638C CN B2004800137121 A CNB2004800137121 A CN B2004800137121A CN 200480013712 A CN200480013712 A CN 200480013712A CN 100426638 C CN100426638 C CN 100426638C
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Abstract
There is provided an eddy-current reduction gear capable of assuring brake capacity and preventing magnetic leak. The eddy-current reduction gear (1) includes: a first magnet ring (18) consisting of a plurality of permanent magnets (16) arranged to oppose to a brake rotor (3) and arranged at an interval in the circumferential direction; and a second magnet ring (7) consisting of a plurality of permanent magnets (10) arranged to oppose to the first magnet ring (18) and arranged at an interval in the circumferential direction. The magnetic force of each permanent magnet (10) of the second magnet ring (7) is set greater than the total of magnetic forces of the one or more of the permanent magnets (16) of the first magnet ring (18) serving as a partner for constituting a magnetic circuit during a brake OFF state. Thus, it is possible to make the magnetic flux leaking to the brake rotor (3) during brake OFF substantially zero.
Description
Technical field
The present invention relates to mainly be applicable to eddy current type reduction gear as the auxiliary brake of oversize vehicle.
Background technology
Eddy current type reduction gear has been used as for example auxiliary brake of truck of oversize vehicle.
Below referring to Figure 15 and Figure 16 the example of traditional eddy current type reduction gear will be described.
This eddy current type reduction gear 51 comprises and is installed in such as the cydariform brake rotors 53 on the rotation axiss such as vehicle drive shaft 52 and radially is placed in the inboard of described brake rotors 53 and is installed in such as the stator on the fixation side such as transmission case 54 (magnetic source).
Two magnet rings 57,58 that described stator 54 comprises the hollow housing 55 that is bearing on the described fixation side and is placed in described housing 55 inboards.
Described first magnet ring 57 is fixed to it and can not rotates with respect to described housing 55, and described second magnet ring 58 is positioned to parallelly with described first magnet ring 57, and is contained in the inboard of described housing 55 rotationally.Described second magnet ring 58 is rotated by actuator 56.
Described first and second magnet rings 57,58 have the support ring 59,60 made by magnetic material respectively and the circumferential a plurality of permanent magnets 61,62 to specify Spacing and to install in described support ring 59,60 upper edges. Permanent magnet 61,62 has pole surface at their radially two ends, and the sensing that they are configured to pole surface is having nothing in common with each other between circumferentially contiguous magnet.
A plurality of pole pieces 63 of being made by magnetic material (ferrous material etc.) are embedded in the periphery wall of described housing 55 with identical spacing along circumferential direction.
When the retarding braking at described eddy current type reduction gear stops (OFF), described second magnet ring 58 is rotated by actuator 56, and the permanent magnet 62 of each permanent magnet 61 of described first magnet ring 57 and described second magnet ring 58 is positioned in and makes them with the opposed facing phase place of different magnetic poles.As a result, as shown in figure 15, between described first and second magnet rings 57,58 and pole piece 63, form the magnetic loop W1 of short circuit.Therefore, do not have magneticaction on described brake rotors 53, and do not produce vortex flow.In other words, do not produce retarding braking.
On the other hand, when described retarding braking was enabled (ON), described second magnet ring 58 was rotated, and the permanent magnet 62 of the permanent magnet 61 of described first magnet ring 57 and described second magnet ring 58 is faced mutually with identical magnetic pole.The result, as shown in figure 16, magnetic flux from the permanent magnet 61,62 of described first and second magnet rings 57,58 arrives described brake rotors 53 through pole piece 63, and forms magnetic loop W2 between described first and second magnet rings 57,58, pole piece 63 and brake rotors 53.Therefore, in described brake rotors 53, produce vortex flow, and realize the retarding braking of described rotation axis 52 by this vortex flow and interaction from the magnetic flux of permanent magnet 61,62.
For example, in Japan Patent open source literature No.H07-123697, this kind eddy current type reduction gear has been described.
Yet, in this kind eddy current type reduction gear, when expectation increases stopping power, must increase the magnetic force of described permanent magnet 61,62.Yet if increase the magnetic force of described magnet 61,62, the problem that is produced is to arrive described brake rotors 53 in described braking stopping period part magnetic flux bleed-through, forms the leakage field loop and also produces slip brake.
Thereby, in the process of improving eddy current type reduction gear, will be referred to such task, promptly when braking is enabled, guarantee stopping power and prevent also that when braking stops magnetic force from leaking.
Summary of the invention
The object of the invention is to address the above problem and provide can guarantee stopping power simultaneously and prevent the eddy current type reduction gear that magnetic force leaks.
In an embodiment of the invention, eddy current type reduction gear comprises: be installed in the brake rotors on the rotation axis; First magnet ring, it comprises that the circumferential compartment of terrain of annular magnet member and edge of relative arrangement with described brake rotors is embedded in a plurality of permanent magnets in the described magnetic component; At second magnet ring of the relative arrangement with described first magnet ring of opposition side of described brake rotors, it comprises along circumferential spaced apart a plurality of permanent magnets; Wherein, described first magnet ring is between described second magnet ring and described brake rotors, and the magnetic force of each permanent magnet of described second magnet ring is configured to greater than the total magnetic force that is used as at one or more permanent magnets of cooperation described first magnet ring partly of braking stopping period formation magnetic loop.
In this embodiment, at the braking stopping period, the magnetic flux of each permanent magnet of described first magnet ring almost completely attracted to each permanent magnetism side of described second magnet ring.Thereby magnetic flux does not leak into described brake rotors side.As a result, the magnetic force between the permanent magnet of described first magnet ring and described second magnet ring can increase and can realize guaranteeing stopping power and prevent the purpose that magnetic force leaks.
Here, the area of the pole surface of the permanent magnet of described second magnet ring is configured to be substantially equal at described braking stopping period and forms the gross area of pole surface of one or more permanent magnets of described first magnet ring of magnetic loop with the permanent magnet of described second magnet ring, and the magnetic density of the permanent magnet of described second magnet ring can be configured to the magnetic density greater than the permanent magnet of described first magnet ring.
Alternatively, the magnetic density of the permanent magnet of described second magnet ring can be set as the magnetic density of the permanent magnet of described no better than first magnet ring, and the area of the pole surface of the permanent magnet of described second magnet ring is configured to greater than forming the gross area of pole surface of one or more permanent magnets of described first magnet ring of magnetic loop at described braking stopping period with the permanent magnet of described second magnet ring.
In addition, phase place relative between braking stopping period described first magnet ring and described second magnet ring can be set difference or ratio that magnetic force, magnetic density or the pole surface between the permanent magnet of the permanent magnet of promptly described second magnet ring and described first magnet ring amassed based on following factor.
In another execution mode of the present invention, eddy current type reduction gear comprises the brake rotors that is installed on the rotation axis, outer magnet ring in the relative arrangement in the inboard of described brake rotors with it, and the inner magnet ring from the inboard and relative arrangement of described brake rotors with it, described outer magnet ring comprises a plurality of permanent magnets, thereby they are along circumferentially arranging to have identical polarity along circumferential opposed facing magnetic pole at interval; Described inner magnet ring comprises a plurality of permanent magnets, thereby they are along arranging at interval that circumferentially each magnetic pole of facing described outer magnet ring is along circumferentially mutual opposite; Wherein, under the braking initiate mode, by making described outer magnet ring face mutually each other with designated phase with described inner magnet ring, be implemented between described outer and inner magnet ring and the described brake rotors and form magnetic loop, and under the braking halted state, by rotating described outer magnet ring and/or inner magnet ring from described braking initiate mode, be implemented in the magnetic loop that forms short circuit between described outer magnet ring and the described inner magnet ring through described designated phase; Wherein, the magnetic force of the permanent magnet of described inner magnet ring is configured to greater than forming the total magnetic force of one or more permanent magnets of described outer magnet ring of the cooperation part of magnetic loop as described braking stopping period with the permanent magnet of described inner magnet ring; And, and it is almost nil to leak into the magnetic flux of described brake rotors under described braking halted state.
Here, described outer magnet ring can comprise the annular magnet member and along circumferentially being embedded in described a plurality of permanent magnets in the described magnetic component with constant space, and can be formed on the radial outside of each permanent magnet by the thin layer portion that described magnetic component produces.
In another execution mode, eddy current type reduction gear comprises first magnet ring of the brake rotors that is installed on the rotation axis, relative arrangement with described brake rotors and second magnet ring of settling relatively with described first magnet ring; Described first magnet ring comprises along circumferential spaced apart a plurality of permanent magnets, and described permanent magnet is along circumferentially having magnetic pole on the end surface of its both sides; Described second magnet ring comprises along circumferential spaced apart a plurality of permanent magnets, and described permanent magnet is along circumferentially having magnetic pole on the end surface of its both sides; Wherein, described first magnet ring is between described second magnet ring and described brake rotors, and the magnetic force of the magnet of described first magnet ring is set in 1 with the ratio of the magnetic force of the magnet of described second magnet ring: about 1.2 to about 1.6 scope.
Here, the magnetic force of the per unit surface area of the magnet of described first magnet ring and described second magnet ring is configured to almost mutually the same, and the ratio of the area of the pole surface of the magnet of described first magnet ring and the area of the pole surface of the magnet of described second magnet ring is set in 1: about 1.2 to about 1.6 scope.
In addition, the axial length of the magnet of described first magnet ring and described second magnet ring and circumferential lengths are set as respectively each other about equally; And the radical length of the magnet of described first magnet ring can be set in 1 with the ratio of the radical length of the magnet of described second magnet ring: about 1.2 to about 1.6 scope.
In another embodiment of the present invention, eddy current type reduction gear comprises the brake rotors that is installed on the rotation axis, at the outer magnet ring of the relative arrangement with it in the inboard of described brake rotors and at inboard and its inner magnet ring of settling relatively of described outer magnet ring; Described outer magnet ring comprises a plurality of permanent magnets, thereby described a plurality of permanent magnet is had identical magnetic along circumferential the layout at interval along circumferential opposed facing magnetic pole, described magnet ring comprises a plurality of permanent magnets, thereby described a plurality of permanent magnet is had identical magnetic along circumferential the layout at interval along circumferential opposed facing magnetic pole; Wherein, under the braking initiate mode, by making described outer magnet ring face mutually each other with designated phase with described inner magnet ring, be implemented between described outer and inner magnet ring and the described brake rotors and form magnetic loop, and under the braking halted state, by rotating described outer magnet ring and/or inner magnet ring from described braking initiate mode through described designated phase, be implemented in the magnetic loop that forms short circuit between described outer magnet ring and the described inner magnet ring, wherein, the magnetic force of the magnet of described outer magnet ring is set in 1 with the ratio of the magnetic force of the magnet of described inner magnet ring: about 1.2 to about 1.6 scope.
Here, described outer magnet ring can comprise the annular magnet member and along circumferentially being embedded in described a plurality of permanent magnets in the described magnetic component with constant space, and comprises that the skim portion of described magnetic component can be formed on the radial outside of each permanent magnet.
Can be formed with radially outward outstanding jut in the part in described magnetic component between each permanent magnet.
Description of drawings
Regard to the detailed explanation of the present invention by reading and understanding down, those skilled in the art will be readily appreciated that other purposes of the present invention, feature and implementation result.
Fig. 1 is a side sectional view, and it shows the first half of eddy current type reduction gear according to an embodiment of the invention;
Fig. 2 is local front cross sectional view, its show as shown in Figure 1 eddy current type reduction gear the braking stopping period state;
Fig. 3 is local front cross sectional view, and it shows the state of eddy current type reduction gear between the braking time suitable to moulding as shown in Figure 1;
Fig. 4 shows at the braking stopping period, the ratio of the magnetic force of described inboard permanent magnet and total power of described outside permanent magnet and the relation that acts on the magnetic flux on the described brake rotors;
Fig. 5 is local front cross sectional view, and its magnetic force that shows at the braking stopping period leaks;
Fig. 6 shows the rotation phase and the relation that acts on the magnetic flux on the described brake rotors of described inner magnet ring;
Fig. 7 a is a side sectional view, and it shows the first half of eddy current type reduction gear according to another embodiment of the present invention;
Fig. 7 b is the top view in cross-section of the part of the eddy current type reduction gear shown in Fig. 7 a;
Fig. 8 is a side sectional view, and it shows the first half of eddy current type reduction gear according to still another embodiment of the invention;
Fig. 9 is local side sectional view, its show as shown in Figure 8 eddy current type reduction gear the braking stopping period state;
Figure 10 is local side sectional view, and it shows it and shows as shown in Figure 8 eddy current type reduction gear at the state of braking between time suitable to moulding;
Figure 11 shows at the braking stopping period, and the permanent magnet of described first and second magnet rings is the relation of the magnetic flux of the outermost perimembranous of length ratio and magnetic component radially;
Figure 12 shows between the braking time suitable to moulding, and the permanent magnet of described first and second magnet rings is the relation of the magnetic flux of the outermost perimembranous of length ratio and magnetic component radially;
The permanent magnet that Figure 13 shows described first and second magnet rings radially length ratio with by with the relation of magnetic flux divided by the resulting value of total radical length of described each permanent magnet;
Figure 14 is a side sectional view, and it shows the first half of eddy current type reduction gear according to still another embodiment of the invention;
Figure 15 is a side sectional view, and it shows the first half of traditional eddy current type reduction gear; And
Figure 16 is local front cross sectional view, and it shows traditional eddy current type reduction gear.
Embodiment
Hereinafter with reference to description of drawings according to a preferred embodiment of the invention.
Fig. 1 is the side sectional view according to the first half of eddy current type reduction gear of the present invention.Fig. 2 is local front cross sectional view, and it shows at braking stopping period, the state of this eddy current type reduction gear.Fig. 3 is local front cross sectional view, and it shows between the braking time suitable to moulding, the state of this eddy current type reduction gear.
As shown in Figure 1, eddy current type reduction gear 1 comprise be installed in such as the cydariform brake rotors 3 on the rotation axiss such as vehicle drive shaft 2 and radially be placed on the inboard of described brake rotors 3 and be installed in such as the stator on the fixation side such as transmission case 4 (magnetic source).Thereby in described rotor 3, produce the retarding braking that vortex flow is drawn described rotation axis 2, and by cancelling described retarding braking at the described magnetic force of described stator 4 inboard shieldings by magnetic force is supplied to rotor 3 from stator 4.
Described stator 4 has the hollow housing 5 that is bearing on the described fixation side, and outer magnet ring (first magnet ring) 18 is installed on the periphery wall of described housing 5 in the mode relative with the inner surface of described brake rotors 3.Shown in Fig. 2 and 3, described outer magnet ring 18 has the ring-shaped magnetic member 17 that is installed on the described housing 5 (for example the lamilated body of electromagnetic steel plate, iron block material etc.) and along circumferentially being embedded in a plurality of permanent magnets 16 in the described magnetic component 17 with constant space.Each permanent magnet 16 edge circumferentially has pole surface at its both ends, and adjacent permanent magnet 16 is configured to face mutually with identical magnetic pole.The thin layer portion 13 that magnetic component 17 produces is formed on the radial outside of each permanent magnet 16.
Inner magnet ring (second magnet ring) 7 is contained in the inboard of described housing 5.At the opposition side (radially inner side) of described brake rotors 3, described inner magnet ring 7 is in the face of described outer magnet ring 18.Described inner magnet ring 7 is configured to and can rotates with respect to described housing 5 via lining 6, and the actuator 8 (for example, hydraulic cylinder) that is set on the sidepiece of described housing 5 rotates.Described inner magnet ring 7 comprises support ring 9, magnetic component 11 and a plurality of permanent magnet 10, described support ring is made of non magnetic body (austenitic stainless steel etc.), described magnetic component (the lamilated body of electromagnetic steel plate for example, iron block material etc.) be arranged on the periphery of described support ring 9, described a plurality of permanent magnets are along circumferentially being embedded in the described magnetic component 11 with constant spacing.Described each permanent magnet 10 radially has pole surface in two ends at it, and they are configured to alternately having nothing in common with each other between circumferentially adjacent magnet 10 in the face of each magnetic pole of described outer magnet ring 18.The circumferential lengths of each permanent magnet 10 of inner magnet ring 7 is configured to be substantially equal to the spacing between each permanent magnet 16 of described outer magnet ring 18 basically.In described magnetic component 11, rectangular opening 15 is formed in the part between described each permanent magnet 10.
When the retarding braking of described eddy current type reduction gear stops, described inner magnet ring 7 is rotated by actuator 8, and as shown in Figure 2, each permanent magnet 10 of described inner magnet ring 7 is positioned between each corresponding permanent magnet 16 of described outer magnet ring 18, and each permanent magnet 10 of described inner magnet ring 7 is positioned in the opposed facing phase place of different magnetic poles with each permanent magnet 16 of described outer magnet ring 18.As a result, between the permanent magnet 10 of described inner magnet ring 7 and the magnetic component 11 and the magnetic loop (short magnetic circuit) 31 that between the permanent magnet 16 of described outer magnet ring 18 and magnetic component 17, forms short circuit.Therefore, there is not magneticaction on described brake rotors 3 and do not produce retarding braking.At this moment, flow to the described thin layer of the magnetic flux process portion 13 formation short circuits (short loop) of described brake rotors 3 from the permanent magnet 16 of described outer magnet ring 18, and can prevent effectively that magnetic force from leaking into described brake rotors 3.
On the other hand, when retarding braking is enabled, described inner magnet ring 7 is rotated, and as shown in Figure 3, each permanent magnet 10 of described inner magnet ring 7 is positioned between each permanent magnet 16 of described outer magnet ring 18, and the permanent magnet 10 of described inner magnet ring 7 is positioned in the opposed facing phase place of identical magnetic pole with the permanent magnet 16 of described outer magnet ring 18.As a result, in described and between the permanent magnet 10,16 of outer magnet ring 7,18, magnetic component 11,17 and the brake rotors 3, form magnetic loop 32,33 respectively.Therefore, in described brake rotors 3, produce vortex flow, and interact by this vortex flow and magnetic flux and to realize the retarding braking of described rotation axis 2 from permanent magnet 10,16.At this moment, owing to formed mouth 15 in the magnetic component 11 of described inner magnet ring 7, therefore the magnetic flux from permanent magnet 10 is prevented from through described magnetic component 11 and formation short circuit.
The inventor has been found that in this kind eddy current type reduction gear, if the magnetic force of the permanent magnet 10 of described inner magnet ring 7 is configured to the total magnetic force greater than each permanent magnet 16 of described outer magnet ring 18, then can be almost nil at the magnetic dispersion of braking stopping period, wherein said permanent magnet 16 and described permanent magnet 10 form magnetic loop each other at braking stopping period (state as shown in Figure 2).More particularly, in the present embodiment,, form magnetic loops by an inboard permanent magnet 10 and two permanent magnets 16 of being positioned at its both sides at the braking stopping period.Therefore, (the magnetic force leakage can be eliminated in W2＞2 * W1) to be arranged to its twice greater than the magnetic force W1 of each outside permanent magnet 16 by the magnetic force W2 with described permanent magnet 10.
Producing the method for different magnetic flux (magnetic flux of per unit surface area), the method for permanent magnet 10,16 of producing the area with different magnetic poles surface or the merging of these methods in permanent magnet 10,16 can be used, so that the magnetic force of described inboard permanent magnet 10 is greater than the magnetic force of described outside permanent magnet 16.
For example, be configured to be substantially equal to the gross area at the area of the pole surface (radial end face) of described inner magnet 10 as the pole surface of two outside permanent magnets 16 of the cooperation part that forms magnetic loop at the braking stopping period, just, when the area of the pole surface of each inboard permanent magnet 10 is configured to equal the twice area of pole surface of each permanent magnet 16, if the magnetic density of inboard permanent magnet 10 is higher than the magnetic density of described outside permanent magnet 16, the magnetic force of then described inboard permanent magnet 10 can be made into greater than the total magnetic force as the cooperation that forms magnetic loop two outside permanent magnets 16 partly.
In addition, when the magnetic density of each inboard permanent magnet 10 and each outside permanent magnet 16 is configured to roughly be equal to each other, if the area of the pole surface of described inboard permanent magnet 10 is made into the gross area greater than the pole surface of two permanent magnets 16 that form magnetic loop at the braking stopping period, the magnetic force of then described inboard permanent magnet 10 can be configured to greater than the total magnetic force as the cooperation that forms magnetic loop two outside permanent magnets 16 partly.For example, when the axial length T1 of described outside permanent magnet 16 was configured to be substantially equal to the axial length T2 of described inboard permanent magnet 10, the circumferential lengths L2 (see figure 2) of described inboard permanent magnet 10 can be greater than twice radical length L1 (L2＞2 * L1) of described outside permanent magnet 16.Alternatively, when the periphery length L2 of described inboard permanent magnet 10 was made into to be substantially equal to the twice radical length L1 of described outside permanent magnet 16, the axial length T2 of described inboard permanent magnet 10 can be greater than the axial length T1 of described outside permanent magnet 16 (T2＞T1).
In addition, when even the area that is configured to the pole surface of almost equal each other and described inboard permanent magnet 10 in the magnetic density of each inboard permanent magnet 10 and each outside permanent magnet 16 is made into to equal the twice area of pole surface of each outside permanent magnet 16, if the radical length of described inboard permanent magnet 10 is made into the circumferential lengths greater than outside permanent magnet 16, the magnetic force of then described inboard permanent magnet 10 can be made into the magnetic force greater than described outside permanent magnet 16.In other words, the volume of described inboard permanent magnet 10 can be made into to surpass the two volumes of described outside permanent magnet 16.
The situation that magnetic force that the inventor is verified by changing described inboard permanent magnet 10 and the magnetic force that produces as the ratio of the total magnetic force of the described outside permanent magnet 16 of the cooperation part that forms magnetic loop at described braking stopping period leak.These results are shown in Figure 4.Here, by with in described and the magnetic density (permeability) of outer magnet ring 10,16 make almost mutually the same and change the area of pole surface of described inboard permanent magnet 10 and described each outside permanent magnet 16 pole surface the gross area recently carry out test.Here, change in 1.1 to 1.7 scope by ratio and carry out test the magnetic force of described inboard permanent magnet 10 and the total magnetic force of described each outside permanent magnet 16.Described ratio is 1.0 to mean that the magnetic force of described inboard permanent magnet 10 equals the twice magnetic force of each described outside permanent magnet 16.
In the drawings, what draw in abscissa is the magnetic force of described inboard permanent magnet 10 and the ratio of total magnetic force of described each outside permanent magnet 16, and what draw at ordinate is the magnetic flux that acts under the braking halted state on the brake rotors 3.
As shown in the figure, be 1.1 o'clock at aforementioned ratio, the magnetic flux that acts on the brake rotors 3 at the braking stopping period produces with specific degrees in positive side (just distinguishing), and reduces gradually along with the increase of described ratio then.At described ratio is about 1.4 o'clock, and described magnetic flux is almost nil, and if this ratio surpass 1.4, then produce magnetic flux at minus side (minus zone).
At described ratio significantly less than 1.4 o'clock, positive magnetic flux acts on the described brake rotors 3, this be because attract from inboard permanent magnet 10 force rate of magnetic flux of outside permanent magnets 16 less and, shown in the dotted line W3 of Fig. 5, the part magnetic flux bleed-through of described outside permanent magnet 16 is to described brake rotors 3 and form the leakage field loop.
In addition, 1.4 ratio means that whole magnetic flux of described each outside permanent magnet 16 attracted to described each inboard permanent magnet 10, and in fact do not have magnetic flux bleed-through to arrive described brake rotors 3.Thereby about 1.4 if the ratio of total magnetic force of the magnetic force of described inboard permanent magnet 10 and described each outside permanent magnet 16 is formed into, then the magnetic force at the braking stopping period leaks and can almost be eliminated fully.
Remarkable at described ratio above 1.4 o'clock, negative magnetic flux acts on the described brake rotors 3, this is because the magnetic force of described inboard permanent magnet 10 is too big, and shown in the dotted line W4 of Fig. 5, the part magnetic flux bleed-through of described inboard permanent magnet 10 is to described brake rotors 3 and form the leakage field loop.In other words, owing to leakage field loop W4 occurs with the leakage field loop opposite direction of W3 that is produced by outside permanent magnet 16, therefore described magnetic flux is made as negative value.
The result, if the magnetic force of described inboard permanent magnet 10 is configured to greater than the total magnetic force that forms described each outside permanent magnet 16 of magnetic loop under the braking halted state with described inboard permanent magnet 10, then leaks and to be eliminated by the magnetic force due to described each outside permanent magnet 16.Yet, be clear that, if the magnetic force of described inboard permanent magnet 10 is too big, produce by the leakage field loop due to the described inboard permanent magnet 10.
Because best ratio, it makes it possible to almost make magnetic force to leak is zero, obviously according to the structure of eddy current type reduction gear and described in and the size of outside permanent magnet 10,16 change, so this ratio is preferably according to each type of described eddy current type reduction gear and correct the setting.
In addition, the inventor has been found that, by make described inboard permanent magnet 10 magnetic force greater than the braking halted state under with described inboard permanent magnet 10 form magnetic loop described each the outside permanent magnet 16 total magnetic force, even can prevent more reliably that magnetic force from leaking, and this also can be by being arranged on the relative phase place between braking stopping period described inner magnet ring 7 and the described outer magnet ring 18, and just described inboard permanent magnet 10 is realized with the relative phase place of described outside permanent magnet 16.These contents are in following explanation.
Fig. 6 show ratio at the magnetic force of described inboard permanent magnet 10 and the total magnetic force of described outside permanent magnet 16 greater than 1.5 situation under, when the braking initiate mode is rotated gradually, analyze the resultant result of magnetic flux who acts on the described brake rotors 3 at described inner magnet ring 7.
In the drawings, be plotted as the rotational angle of described inboard permanent magnet 7 on the abscissa, and 0 ° angle is corresponding with the phase place of braking initiate mode.In other words, under this state, as shown in Figure 3, each inboard permanent magnet 10 is precisely placed in the centre of corresponding outside permanent magnet 16, and described each permanent magnet is faced mutually with identical magnetic pole.The phase place that on behalf of described inner magnet ring 7,11 ° angle rotate through a span of described inboard permanent magnet 10.In other words, under this state, as shown in Figure 2, each inboard permanent magnet 10 is precisely placed in the centre of corresponding outside permanent magnet 16, and described permanent magnet is faced mutually with different magnetic poles.
Next as shown in Figure 6, along with the rotation of described inner magnet ring 7 since 0 °, the magnetic flux that acts on the described brake rotors 3 reduces gradually.In addition, when described inner magnet ring 7 was rotated through about 8.5 °, magnetic flux was almost nil.If further rotate described magnet ring 7, then negative magnetic flux (along reverse magnetic flux) acts on the described brake rotors 3.Thereby, when the magnetic force of described inboard permanent magnet 10 is constructed to 1.5 times of total magnetic force of described each outside permanent magnet 16, can almost completely eliminates described magnetic force through the phase place of the span (spans that about 8.5 ° of correspondences are 11 °) that is slightly less than described each permanent magnet 10 and leak by rotate described inner magnet ring 7 at the braking stopping period.
In above-mentioned test as shown in Figure 4, be rotated a span of described each the inboard permanent magnet 10 of process at the described inner magnet ring 7 of braking stopping period.Thereby, when the magnetic force of described inboard permanent magnet 10 is about 1.4 times of total magnetic force of described each outside permanent magnet 16, if be configured to equal a span of described each inboard permanent magnet 10 in the rotation phase of braking stopping period described inner magnet ring 7, then can almost completely eliminate magnetic force and leak.
Thereby, the magnetic force that the rotational angle that described magnetic force leaks the described inner magnet ring 7 that can be minimized is fixed against described inboard permanent magnet 10 with described outside each the total magnetic force of permanent magnet 16 poor (or ratio) and change.Thereby, difference (ratio) based on magnetic force, magnetic density or pole surface area between described inboard permanent magnet 10 and the described outside permanent magnet 16, be arranged under the braking halted state relative phase place between described outer magnet ring 18 and the inner magnet ring 7, can prevent the magnetic force leakage more reliably.Based on various test, the inventor confirms that because the magnetic force of described inboard permanent magnet 10 becomes greater than the total magnetic force of described each outside permanent magnet 16, therefore the rotation phase at the described inner magnet ring 7 of braking stopping period can reduce.
The The above results explanation, phase place by being arranged on braking stopping period described inner magnet ring 7 is corresponding to the ratio of the total magnetic force of the magnetic force of described inboard permanent magnet 10 and described each outside permanent magnet 16, stopping power at the braking stopping period can be guaranteed, and leaked and can be prevented from the magnetic force of braking stopping period.
Its reason is as described below.Therefore at first, because the magnetic flux that acts on the described brake rotors 3 can increase, can obtain to brake the improvement of the stopping power of stopping period by the magnetic force that increases described inboard permanent magnet 10.Yet, following according to Fig. 4, when the rotation phase of described inner magnet ring 7 equals 1 span of described each inboard permanent magnet 10, if it is too big (at this that the magnetic force of described inboard permanent magnet 10 becomes, if it is configured to 1.4 times above the total magnetic force of described outside permanent magnet 16), then take place to leak by the magnetic force due to the described inboard permanent magnet 10 at the braking stopping period.Therefore, avoid this magnetic force to leak by the rotation phase that reduces described inboard permanent magnet less than 1 span.In other words, obtain the improvement of stopping power by the magnetic force that increases described inboard permanent magnet 10, and by set the rotation phase of described inner magnet ring 7 based on the difference (or ratio) of the magnetic force between described inboard permanent magnet 10 and the described outside permanent magnet 16, described magnetic force leaks and can be zero.
In addition, the foregoing description only is an example, and its various remodeling is fine.
For example, in the above-described embodiments, the structure that is rotated about described inner magnet ring 7 is illustrated, but the structure that the present invention also can adopt described inner magnet ring 7 fixing and described outer magnet rings 18 to be rotated.
In addition, shown in Fig. 7 a and 7b, the present invention also can adopt the eddy current type reduction gear that is equipped with disc braking rotor 40 types.In this structure, on housing 41 is installed in and is relatively fixed side from this side part and described brake rotors 40, and first magnet ring 42 (being equal to outer magnet ring 18 as shown in Figure 1) is installed on the described housing 41.Second magnet ring 43 (being equal to inner magnet ring 7 as shown in Figure 1) is arranged on described housing 41 inboards rotationally, and this second magnet ring 43 from the opposite sides of described brake rotors 40 to described first magnet ring 42.Described first magnet ring 42 comprises a plurality of permanent magnets 44 of settling with appointed interval along circumferentially, and they are configured to have identical polarity along circumferential opposed facing magnetic pole.Described second magnet ring 43 comprises a plurality of permanent magnets 45 of settling to specify Spacing along circumferentially, and they are configured to face each magnetic pole of described first magnet ring 42 along circumferential and mutual opposite.
In this kind eddy current type reduction gear, equally, by at the magnetic force of each permanent magnet 45 that is configured to described second magnet ring 43 under this setting ratio situation total magnetic force greater than each magnet 44 of described first magnet ring 42 that under the braking halted state, therewith forms magnetic loop, and, can prevent the magnetic force leakage reliably by reasonably being set in phase place relative between braking stopping period described first magnet ring 42 and described second magnet ring 43 corresponding to this ratio.
Below will another embodiment of the present invention be described referring to Fig. 8 to Figure 10.Fig. 8 is the side sectional view of the first half of the eddy current type reduction gear of this embodiment.Fig. 9 is local front cross sectional view, its show as shown in Figure 8 eddy current type reduction gear the braking stopping period state.Figure 10 is local front cross sectional view, and it shows the state of eddy current type reduction gear between the braking time suitable to moulding as shown in Figure 8.
As shown in Figure 8, this eddy current type reduction gear 1 comprise be installed in such as the cydariform brake rotors 3 on the rotation axiss such as vehicle drive shaft 2 and radially be placed on the inboard of described brake rotors 3 and be installed in such as the stator on the fixation side such as transmission case 4 (magnetic source).Thereby in described rotor 3, produce the retarding braking that vortex flow is drawn described rotation axis 2, and by cancelling described retarding braking at the described magnetic force of described stator 4 inboard shieldings by magnetic force is supplied to rotor 3 from stator 4.
Described stator 4 comprises the hollow housing 5 that is bearing on the described fixation side, and outer magnet ring (first magnet ring) 18 is installed on the periphery wall of described housing 5 in the mode relative with the inner surface of described brake rotors 3.As Fig. 9 and shown in Figure 10, described outer magnet ring 18 comprises the magnetic component 17 that is installed on the described housing 5 (for example the lamilated body of electromagnetic steel plate, iron block material etc.) and along circumferentially being embedded in a plurality of permanent magnets 16 in the described magnetic component 17 with constant space.Each permanent magnet 16 edge circumferentially has magnetic pole at its both ends and adjacent permanent magnet 16 is configured to face mutually with identical magnetic pole.The thin layer portion 13 that constitutes magnetic component 17 is formed on the radial outside of each permanent magnet 16.Radially outward Tu Chu jut 14 is formed in the magnetic component 17 between each permanent magnet 16.
Inner magnet ring (second magnet ring) 7 same with described outer magnet ring 18 is contained in the described housing 5 rotationally via lining 6.This inner magnet ring 7 is configured to from that side (radially inner side) opposite with described brake rotors 3 in the face of described outer magnet ring 18, and this inner magnet ring is rotated by the actuator on the sidepiece that is arranged on described housing 58 (for example, hydraulic cylinder).Described inner magnet ring 7 comprises support ring 9, magnetic component 11 and a plurality of permanent magnet 10, described support ring is made of non magnetic body (austenitic stainless steel etc.), described magnetic component (the lamilated body of electromagnetic steel plate for example, iron block material etc.) be arranged on the periphery of described support ring 9, described a plurality of permanent magnets are along circumferentially being embedded in the described magnetic component 11 with constant space.Each permanent magnet 10 is along circumferentially having magnetic pole at its both ends, and they are configured to adjacent permanent magnet 10 and face mutually with identical magnetic pole.The thin layer portion 12 that constitutes magnetic component 11 is formed on the radial outside of each permanent magnet 10.Corresponding span with each permanent magnet 10,16 of outer magnet ring 7,18 in described is configured to roughly the same each other.
When the retarding braking of described eddy current type reduction gear stops, described inner magnet ring 7 is rotated by actuator 8, and as shown in Figure 9, each permanent magnet 10 of described inner magnet ring 7 is faced by different mutually magnetic poles mutually with each permanent magnet 16 of described outer magnet ring 8.As a result, between each permanent magnet 10 of described inner magnet ring 7 and the described magnetic component 11 and the magnetic loop 31 that between each permanent magnet 16 of described outer magnet ring 18 and described magnetic component 11, forms short circuit.Thereby, there is not magneticaction on described brake rotors 3 and do not produce retarding braking.At this moment, each permanent magnet 16 from described outer magnet ring 18 flow to the described thin layer of the magnetic flux process portion 13 of described brake rotors 3 and forms short circuit.And prevent that effectively magnetic force from leaking into described brake rotors 3.
On the other hand, when described retarding braking was enabled, described inner magnet ring 7 was rotated, and as shown in figure 10, the permanent magnet 10 of described inner magnet ring 7 is done with identical magnetic pole with the permanent magnet of described outer magnet ring 18 16 and faced mutually.As a result, in described and between the permanent magnet 10,16 of outer magnet ring 7,18, magnetic component 11,17 and the brake rotors 3, form magnetic loop 32,33 respectively.Thereby, in described brake rotors 3, produce vortex flow, and realize the retarding braking of described rotation axis 2 by this vortex flow and interaction from the magnetic flux of permanent magnet 10,16.At this moment, owing within the part that is placed in the magnetic component 17 between each permanent magnet 16, form radially outward outstanding jut 14, so the air gap between described magnetic component 17 and described brake rotors 3 is very little and can obtain high braking force.
The inventor has been found that in this kind eddy current type reduction gear, by the permanent magnet 10 of the described inner magnet ring 7 of correct setting and the ratio of the magnetic force of the permanent magnet 16 of described outer magnet ring 18, can guarantee stopping power and can prevent effectively that magnetic force from leaking.More particularly, by to specify the ratio structure to make the magnetic force of permanent magnet 10 of described inner magnet ring 7, can effectively guarantee stopping power and can prevent effectively that meanwhile magnetic force from leaking greater than the magnetic force of the permanent magnet 16 of described outer magnet ring 18.
The inventor has also carried out various test, i.e. the optimum value of recently finding out this ratio of the magnetic force of the permanent magnet 10 of the magnetic force of the permanent magnet 16 by changing described outer magnet ring 18 and described inner magnet ring 7.Here, by the axial length of described permanent magnet 10,16 (as shown in Figure 8 along the length of direction) from left to right and circumferential lengths (as Fig. 9 and the edge shown in Figure 10 length of direction from left to right) are set for they almost equal each other and change as described in radical length L1, the L2 (see figure 9) of permanent magnet 10,16 carry out these tests.Thereby, can change the area of the pole surface of described permanent magnet 10,16 by radical length L1, the L2 that changes described permanent magnet 10,16.Because the permanent magnet 10,16 that is used has the magnetic flux of roughly the same every surface area, therefore the magnetic force of described permanent magnet 10,16 roughly equal proportion in the area of described pole surface.
Result of the test such as Figure 11 are to shown in Figure 13.
Figure 11 shows about the analysis result in the magnetic density of the most peripheral part B (see figure 9) of braking stopping period described magnetic component 17, and is used for judging at braking stopping period magnetic force and leaks.Figure 12 shows the analysis result about the magnetic density of the most peripheral part B of described magnetic component 17 between the braking time suitable to moulding, and is used for judging stopping power.Figure 13 shows magnetic density with the most peripheral part B of described magnetic component 17 between the braking time suitable to moulding divided by the resulting value of total radical length (L1+L2) of described permanent magnet 10,16, and is used for judging retardation efficiency.
The radical length L1:5 of the permanent magnet 16 of three types described outer magnet ring 18,10 and 15mm be used as experimental condition and, the radical length L2 of the permanent magnet 10 of described inner magnet ring 7 is to change in 0.8 to 2.2 scope with the ratio (L2/L1) of described radical length L1.In Figure 11 to Figure 13, the line of being painted by square dot is to be the result who obtains under the 5mm situation at the radical length L1 of described permanent magnet 16, the line that Diamond spot is painted is to be the result who obtains under the 10mm situation in described length, and the line painted of triangle form point is to be the result who obtains under the 15mm situation in described length.
At first, as shown in figure 11, ratio (L2/L1) at the radical length L2 of the permanent magnet 10 of described inner magnet ring 7 and the radical length L1 of the permanent magnet 16 of described outer magnet ring 18 is chosen to be at about 1.4 o'clock, the magnetic leakage flux is almost nil, and at this ratio or when higher or lower, this magnetic leakage flux increases gradually.In other words, if the ratio of described permanent magnet 10 and the magnetic force of described permanent magnet 16 is set near 1.4, more particularly, from about 1.2 to about 1.6 scope, then magnetic flux bleed-through can almost or fully be eliminated.If this ratio is too little, then magnetic flux bleed-through significantly increases, and this is because the power of the permanent magnet 10 of the described inner magnet ring 7 of the magnetic flux of the permanent magnet 16 of the described outer magnet ring 18 of attraction reduces and the part magnetic flux bleed-through of described permanent magnet 16 arrives described brake rotors 3.On the other hand, if this ratio is too big, then the magnetic leakage flux significantly increases, and this is because the magnetic force of the permanent magnet 10 of described inner magnet ring 7 becomes greatly and its part magnetic flux bleed-through arrives described brake rotors 3.It is such scope that above-mentioned 1.2 to 1.6 scope can be said to, promptly in this scope, the magnetic flux that nearly all magnetic flux of each permanent magnet 16 of described outer magnet ring 18 attracted to the permanent magnet 10 of the permanent magnet 10 of described inner magnet ring 7 and described inner magnet ring 7 flows to described brake rotors 3.
In addition, curve as shown in figure 11 confirms that the radical length L1 of the permanent magnet 16 of described outer magnet ring 18 is more little, and then the zone of low magnetism leakage flux is just big more.
In addition, as shown in figure 12, be clear that, increase along with the increase of radical length L2 with the ratio of the radical length L1 of the permanent magnet 16 of described outer magnet ring 18 of the permanent magnet 10 of described inner magnet ring 7 (that is, along with the radical length L2 of described permanent magnet 10 increase) in the braking force of braking between time suitable to moulding.In addition, be clear that the radical length L1 of the permanent magnet 16 of described outer magnet ring 18 is big more, then braking force is just big more.In other words, these results confirm that also the magnetic force of described permanent magnet 10,16 is big more, and then described braking force is just big more.
In addition, as shown in figure 13, be clear that, the magnetic flux of the per unit length of magnet (retardation efficiency) be constant and disobey the forward ratio (L2/L1) of stating during for 10mm at the radical length L1 of the permanent magnet 16 of described outer magnet ring 18, the increase along with this ratio when the radical length L1 of described permanent magnet 16 is 5mm of the magnetic flux of the per unit length of described magnet increases, and the increase with this ratio when the radical length of described permanent magnet 16 is 15mm of the magnetic flux of the per unit length of described magnet reduces.In other words, when the radical length L1 of the permanent magnet 16 of described outer magnet ring 18 is 15mm, compare with the permanent magnet 10 of described inboard permanent magnet 7, under the effect of the permanent magnet 16 of described outer magnet ring 18, produce more braking torque, and when the radical length L1 of the permanent magnet 16 of described outer magnet ring 18 is 5mm, compare with the permanent magnet 16 of described outside permanent magnet 18, under the effect of the permanent magnet 10 of described inner magnet ring 7, produce more braking torque.
The above results confirms, if the magnetic force of the permanent magnet 10 of described inner magnet ring 7 is set at 1 with the ratio of the magnetic force of the permanent magnet 16 of described outer magnet ring 18: about 1.2 to about 1.6 scope, can guarantee that then braking force is equal to or higher than legacy system, and almost completely or fully prevent that magnetic force from leaking simultaneously.
In addition, when the described eddy current type reduction gear of actual design, can be according to preventing that preferentially magnetic force from leaking and guaranteeing that the thought of braking force sets aforementioned ratio.In other words, if it is more important to prevent that magnetic force from leaking, then this ratio can be set near 1.4, and if braking force more important, then this ratio can be set near 1.6 as far as possible.In any case if described ratio is about 1.2 to about 1.6 scope, then on high relatively rank, can guarantee the braking force that prevents Yu guaranteed that magnetic force leaks these two.
Can consider the foregoing description is carried out various modification.
For example, in the above-described embodiments, the situation of ratio of radical length L1, the L2 of the permanent magnet 16,10 of setting described outer and inner magnet ring 18,7 has been described, but has the invention is not restricted to this feature.In other words, because described permanent magnet 10 can be set in the above-mentioned scope with the ratio of the magnetic force of described permanent magnet 16, so the ratio of axial thickness can be set in this scope or the ratio of the intensity (magnetic force of per unit surface area) of each magnet can be set in this scope.
In addition, in the above-described embodiments, the structure that described inner magnet ring 7 is rotated has been described, the structure that described outer magnet ring 18 is rotated but the present invention also can adopt described inner magnet ring 7 to be fixed.
In addition, as shown in figure 14, the present invention also can adopt the eddy current type reduction gear that is equipped with disc braking rotor 40 types.In this structure, housing 41 is installed in fixation side and relative with described brake rotors 40 from sidepiece, and first magnet ring 42 (being equal to outer magnet ring 18 as shown in Figure 8) is installed on the described housing 41.In addition, second magnet ring 43 (being equal to inner magnet ring 7 as shown in Figure 8) thus be arranged on the inboard opposite sides from described brake rotors 40 of described housing 41 rotationally to described first magnet ring 42.Be similar to outer and inner magnet ring 18,7 as shown in Figure 8, described first and second magnet rings 42,43 comprise a plurality of permanent magnets 44,45 of settling to specify Spacing along circumferentially, and they are configured to have identical polarity along circumferential opposed facing magnetic pole.
In this kind eddy current type reduction gear, equally, be set in 1 by the ratio with the magnetic force of the permanent magnet 45 of described second magnet ring 43 and the magnetic force of the permanent magnet 44 of described first magnet ring 42: about 1.2 to about 1.6 scope, can obtain the effect same with the foregoing description.
The application requires the priority of Japanese patent application No.2003-140347 and 2003-140348 (the two is all submitted on May 19th, 2003), and the content of these applications is incorporated herein by the reference of this specification.
Claims (12)
1. eddy current type reduction gear comprises:
Be installed in the brake rotors on the rotation axis;
First magnet ring, it comprises that the circumferential compartment of terrain of annular magnet member and edge of relative arrangement with described brake rotors is embedded in a plurality of permanent magnets in the described magnetic component;
At second magnet ring of the relative arrangement with described first magnet ring of opposition side of described brake rotors, it comprises along circumferential spaced apart a plurality of permanent magnets; Wherein
Described first magnet ring is between described second magnet ring and described brake rotors;
The magnetic force of each permanent magnet of described second magnet ring is configured to greater than the total magnetic force that is used as at one or more permanent magnets of cooperation described first magnet ring partly of braking stopping period formation magnetic loop.
2. eddy current type reduction gear according to claim 1 is characterized in that:
The area of the pole surface of the permanent magnet of described second magnet ring is configured to equal form the gross area of pole surface of one or more permanent magnets of described first magnet ring of magnetic loop at described braking stopping period with the permanent magnet of described second magnet ring; And
The magnetic density of the permanent magnet of described second magnet ring is configured to the magnetic density greater than the permanent magnet of described first magnet ring.
3. eddy current type reduction gear according to claim 1 is characterized in that:
The magnetic density of the permanent magnet of the permanent magnet of described second magnet ring and described first magnet ring is configured to be equal to each other; And
The area of the pole surface of the permanent magnet of described second magnet ring is configured to greater than forming the gross area of pole surface of one or more permanent magnets of described first magnet ring of magnetic loop at described braking stopping period with the permanent magnet of described second magnet ring.
4. according to the arbitrary described eddy current type reduction gear of claim 1 to 3, it is characterized in that difference or the ratio long-pending based on magnetic force, magnetic density or pole surface between the permanent magnet of the permanent magnet of described first magnet ring and described second magnet ring are set in relative phase place between described first magnet ring of described braking stopping period and described second magnet ring.
5. eddy current type reduction gear comprises:
Be installed in the brake rotors on the rotation axis;
At the outer magnet ring of the relative arrangement with it in the inboard of described brake rotors, described outer magnet ring comprises a plurality of permanent magnets, and they are arranged at interval along circumferential, thereby have identical polarity along circumferential opposed facing magnetic pole;
At the inner magnet ring of the relative arrangement with it in the inboard of described outer magnet ring, described inner magnet ring comprises a plurality of permanent magnets, and their edges are circumferentially arranged at interval, thereby each magnetic pole edge of facing described outer magnet ring is circumferentially mutual opposite; Wherein, under the braking initiate mode, by making described outer magnet ring face mutually each other with designated phase with described inner magnet ring, be implemented between described outer and inner magnet ring and the described brake rotors and form magnetic loop, and under the braking halted state, by rotating described outer magnet ring and/or inner magnet ring from described braking initiate mode, be implemented in the magnetic loop that forms short circuit between described outer magnet ring and the described inner magnet ring through described designated phase; Wherein
The magnetic force of the permanent magnet of described inner magnet ring is configured to greater than forming the total magnetic force of one or more permanent magnets of described outer magnet ring of the cooperation part of magnetic loop as described braking stopping period with the permanent magnet of described inner magnet ring; And
The magnetic flux that leaks into described brake rotors under described braking halted state is zero.
6. eddy current type reduction gear according to claim 5 is characterized in that:
Described outer magnet ring comprises the annular magnet member, and described a plurality of permanent magnets are along circumferentially being embedded in the described magnetic component with constant space; And
Be formed on the radial outside of each permanent magnet by the thin layer portion of described magnetic component generation.
7. eddy current type reduction gear comprises:
Be installed in the brake rotors on the rotation axis;
First magnet ring of relative arrangement with described brake rotors, described first magnet ring comprise along circumferential spaced apart a plurality of permanent magnets, and described permanent magnet is along circumferentially having magnetic pole on the end surface of its both sides;
Second magnet ring of relative arrangement with described first magnet ring, described second magnet ring comprise along circumferential spaced apart a plurality of permanent magnets, and described permanent magnet is along circumferentially having magnetic pole on the end surface of its both sides; Wherein
Described first magnet ring is between described second magnet ring and described brake rotors;
The magnetic force of the magnet of described first magnet ring is set in 1 with the ratio of the magnetic force of the magnet of described second magnet ring: about 1.2 to about 1.6 scope.
8. eddy current type reduction gear according to claim 7 is characterized in that:
The magnetic force of the per unit surface area of the magnet of described first magnet ring and described second magnet ring is configured to mutually the same; And
The area of the pole surface of the magnet of described first magnet ring is set in 1 with the ratio of the area of the pole surface of the magnet of described second magnet ring: about 1.2 to about 1.6 scope.
9. according to claim 7 or 8 described eddy current type reduction gears, it is characterized in that:
The axial length of the magnet of described first magnet ring and described second magnet ring and circumferential lengths are set as respectively and are equal to each other; And
The radical length of the magnet of described first magnet ring is set in 1 with the ratio of the radical length of the magnet of described second magnet ring: about 1.2 to about 1.6 scope.
10. eddy current type reduction gear comprises:
Be installed in the brake rotors on the rotation axis;
At the outer magnet ring of the relative arrangement with it in the inboard of described brake rotors, described outer magnet ring comprises a plurality of permanent magnets, thereby described a plurality of permanent magnet is had identical magnetic along circumferential the layout at interval along circumferential opposed facing magnetic pole;
At the inner magnet ring of the relative arrangement with it in the inboard of described outer magnet ring, described inner magnet ring comprises a plurality of permanent magnets, thereby described a plurality of permanent magnet is had identical magnetic along circumferential the layout at interval along circumferential opposed facing magnetic pole; Wherein, under the braking initiate mode, by making described outer magnet ring face mutually each other with designated phase with described inner magnet ring, be implemented between described outer and inner magnet ring and the described brake rotors and form magnetic loop, and under the braking halted state, by rotating described outer magnet ring and/or inner magnet ring from described braking initiate mode, be implemented in the magnetic loop that forms short circuit between described outer magnet ring and the described inner magnet ring through described designated phase; Wherein
The magnetic force of the magnet of described outer magnet ring is set in 1 with the ratio of the magnetic force of the magnet of described inner magnet ring: about 1.2 to about 1.6 scope.
11. eddy current type reduction gear according to claim 10 is characterized in that:
Described outer magnet ring comprises the annular magnet member, and described a plurality of permanent magnets are along circumferentially being embedded in the described magnetic component with constant space; And
Be formed on the radial outside of each permanent magnet by the thin layer portion of described magnetic component generation.
12. eddy current type reduction gear according to claim 11 is characterized in that:
In the part that is placed in the described magnetic component between described each permanent magnet, be formed with radially outward outstanding jut.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003140347A JP4296835B2 (en) | 2003-05-19 | 2003-05-19 | Eddy current reducer |
| JP140348/2003 | 2003-05-19 | ||
| JP2003140348A JP4296836B2 (en) | 2003-05-19 | 2003-05-19 | Eddy current reducer |
| JP140347/2003 | 2003-05-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1792024A CN1792024A (en) | 2006-06-21 |
| CN100426638C true CN100426638C (en) | 2008-10-15 |
Family
ID=33529094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800137121A Expired - Fee Related CN100426638C (en) | 2003-05-19 | 2004-05-13 | Eddy current type reduction gear |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4296835B2 (en) |
| CN (1) | CN100426638C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119059B (en) * | 2007-06-27 | 2011-02-02 | 韵升控股集团有限公司 | Eddy current speed reducer |
| CN106043350A (en) * | 2016-05-27 | 2016-10-26 | 同济大学 | Independent control braking system used for tramcar early warning avoidance |
| JP6568137B2 (en) * | 2017-04-07 | 2019-08-28 | トヨタ自動車株式会社 | Magnetic clutch mechanism |
| US11165326B2 (en) * | 2018-01-29 | 2021-11-02 | Nippon Steel Corporation | Eddy current decelerating apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07123697A (en) * | 1993-10-18 | 1995-05-12 | Isuzu Motors Ltd | Eddy current type reduction gear |
| JPH07274480A (en) * | 1994-04-04 | 1995-10-20 | Isuzu Motors Ltd | Eddy current type reduction gear |
| JP2000358357A (en) * | 1999-04-13 | 2000-12-26 | Isuzu Motors Ltd | Eddy current decelerator |
| JP2002223556A (en) * | 2001-01-26 | 2002-08-09 | Sumitomo Metal Ind Ltd | Eddy current type deceleration device |
-
2003
- 2003-05-19 JP JP2003140347A patent/JP4296835B2/en not_active Expired - Fee Related
-
2004
- 2004-05-13 CN CNB2004800137121A patent/CN100426638C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07123697A (en) * | 1993-10-18 | 1995-05-12 | Isuzu Motors Ltd | Eddy current type reduction gear |
| JPH07274480A (en) * | 1994-04-04 | 1995-10-20 | Isuzu Motors Ltd | Eddy current type reduction gear |
| JP2000358357A (en) * | 1999-04-13 | 2000-12-26 | Isuzu Motors Ltd | Eddy current decelerator |
| JP2002223556A (en) * | 2001-01-26 | 2002-08-09 | Sumitomo Metal Ind Ltd | Eddy current type deceleration device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004343953A (en) | 2004-12-02 |
| JP4296835B2 (en) | 2009-07-15 |
| CN1792024A (en) | 2006-06-21 |
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