JP3882387B2 - Eddy current reducer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an eddy current type reduction device for assisting a foot brake as a main brake of a vehicle and for applying deceleration braking to the vehicle.
[0002]
[Prior art]
  When the vehicle goes down a long slope, it is necessary to continuously apply braking force to the vehicle in order to suppress acceleration generated in the vehicle. If this braking force is applied only by the foot brake, which is the main brake, The lining burns out and burns out. In order to solve this problem, large vehicles have conventionally been equipped with exhaust brakes and used as auxiliary brakes when going downhill.High superchargingAt present, a sufficient braking force cannot be obtained due to a reduction in engine displacement due to the above. Therefore, an eddy current type reduction device has been proposed and put into practical use as a deceleration braking device (retarder) for reducing or limiting the traveling speed of the vehicle when the vehicle is going downhill.
[0003]
An eddy current type speed reducer is disclosed in, for example, Japanese Patent Publication No. 6-14782. Japanese Patent Publication No. 6-14782 discloses an eddy current type speed reducer that includes a drum-shaped rotor attached to an output shaft of a transmission mounted on a vehicle and a plurality of permanent gears at equal intervals in the circumferential direction. An annular magnet means mounted with a magnet, and a braking position where the magnet means is placed close to the rotor and the magnet means applies a magnetic field to the rotor, and a braking release position where the magnet means does not exert a magnetic field on the rotor by separating the magnet means from the rotor. When the magnet means is positioned at the braking position by the actuator, the braking action is performed. When the permanent magnet is positioned at the braking release position, the braking action is released.
[0004]
The braking ability of the eddy current type reduction gear as described above is proportional to the magnetic force of the magnet, the diameter of the rotor, and the rotational speed of the rotor, and varies depending on the material of the rotor. Since the diameter of the rotor is limited by the mounting space of the vehicle, there is a limit to increase it. Further, the rotational speed of the rotor is regulated by the rotational speed of the rotary shaft that couples the rotor. For this reason, the conventional eddy current type speed reducer has improved the braking capability by increasing the magnetic force of the magnet or selecting the material of the rotor. However, when the braking force is increased, the amount of heat generated by the rotor increases, causing a problem in the cooling performance of the rotor, and the braking ability cannot be dramatically improved.
[0005]
In order to solve the above-described problem, the present applicant arranges a speed increasing mechanism such as a planetary gear mechanism between the rotating shaft and the rotor, and performs braking by increasing the rotating speed of the rotor from the rotating speed of the rotating shaft. Japanese Patent Application No. 10-102016 has proposed an eddy current type speed reducer capable of improving the capacity and improving the cooling efficiency of the rotor.
[0006]
[Problems to be solved by the invention]
  Thus, in the eddy current type speed reducer disclosed in Japanese Patent Application No. 10-102016, since the rotor is rotatably supported by the rotor support member which is a fixed member, the rotational speed of the rotor is increased. Since the relative rotational speed between the rotor and the rotor support member is large, the durability of the bearing disposed between them becomes a problem.Furthermore, an increase in air resistance due to higher rotor rotation becomes a problem..
[0007]
  The present invention has been made in view of the above facts,The technical challenge isEven in an eddy current type speed reducer in which a speed increasing mechanism is disposed between the rotating shaft and the rotor, the relative rotational speed difference between the rotor and the support member that rotatably supports the rotor is reduced, and the durability of the bearing is reduced. An object of the present invention is to provide an eddy current type speed reducer capable of improving the performance.In addition, the eddy current type that can improve the fuel efficiency of the vehicle by eliminating the air resistance caused by the rotation of the rotor in a state where the eddy current type speed reduction device does not exert a braking action on the vehicle, that is, in a normal running state of the vehicle. To provide a reduction gear.
[0008]
[Means for Solving the Problems]
  According to the present invention,Technical issues aboveTo solve
“A rotor driven by a rotating shaft,
Magnet means provided with a plurality of magnets arranged opposite to the rotor;
An eddy current reduction device comprising: a speed increasing mechanism that speeds up and transmits the driving force of the rotating shaft to the rotor;
The speed increasing mechanism includes a sun gear attached to a fixed member, a ring gear attached to the rotor, a rotor support member attached to the rotating shaft and rotatably supporting the rotor, and the rotor support member. A planetary gear mounted and meshed with the sun gear and the ring gear;
The sun gear is rotatably supported by the fixing member, and includes a clutch that selectively engages the sun gear and the fixing member. ''
An eddy current type speed reducer characterized by the above is provided.
[0009]
  The clutch can be configured as a friction clutch. It is also possible to employ a synchronous mesh clutch used in a vehicle transmission or the like..
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, a preferred embodiment of an eddy current type speed reducer constructed according to the present invention will be described in more detail with reference to the accompanying drawings.Here, FIG. 1 to FIG. 6 show the configuration and operation of an eddy current type speed reducer which is a basic form improved according to the present invention..
[0011]
  In FIG.Basic form of eddy current reducer1 is a cross-sectional view of a gear mounted on an output shaft of a transmission mounted on a vehicle. The eddy current type reduction device in the illustrated basic form includes a rotor support member 20 that is spline-fitted to the output shaft 11 of the transmission 10 and fixed to a mounting flange 13 that is attached by a nut 12. The rotor support member 20 includes a support portion 21 formed in an annular shape, and a mounting portion 22 formed to project radially inward from a central portion of the inner peripheral surface of the support portion 21. 22 is fixed to the mounting flange 13 by fastening means such as bolts 14a and nuts 14b.
[0012]
A rotor 30 is rotatably disposed on the outer peripheral surface of the rotor support member 20 configured as described above via a bearing 25. The rotor 30 includes an annular supported portion 31, an end wall 32 extending upward from the right end in the figure of the supported portion 31, and an annular braking portion attached to the upper end of the end wall 32 by fixing means such as welding. 33, the supported portion 31 is fitted into a bearing 25 disposed on the outer peripheral surface of the support portion 21 of the rotor support member 20. The braking portion 33 is made of a magnetic material, and a plurality of heat radiating fins 34 are mounted on the outer peripheral surface thereof. A seal 36 is mounted between the right end portions of the support portion 21 of the rotor support member 20 and the supported portion 31 of the rotor 30 in the figure.
[0013]
  IllustratedBasic formThe eddy current type speed reducer includes a speed increasing mechanism 50 that increases the driving force of the rotor support member 20 attached to the output shaft 11 and transmits it to the rotor 30. The speed increasing mechanism 50 is constituted by a planetary gear mechanism having a sun gear 51, a ring gear 52 and a planetary gear 53. The sun gear 51 includes a boss portion 511 and a gear 512 formed on the outer periphery of the boss portion 511. The boss portion 511 is attached to the case 15 of the transmission 10 as a fixing member by a fastening bolt 16. Yes. The ring gear 52 includes a cylindrical portion 521 that is integrally formed continuously with the left end of the supported portion 31 constituting the rotor 30 in FIG. 1, and a gear 522 that is formed on the inner periphery of the cylindrical portion 521. The gear 522 is provided to face the gear 512 of the sun gear 51. The planetary gear 53 is rotatably supported by a support shaft 54 attached to the left end in FIG. 1 of the support portion 21 constituting the rotor support member 20, and the gear 512 of the sun gear 51 and the gear of the ring gear 52. 522 is engaged. A seal 37 is mounted between the left end portion of the cylindrical portion 521 of the ring gear 52 in FIG. 1 and the left end portion of the boss portion 511 of the sun gear 51 in FIG.
[0014]
  IllustratedBasic formThe speed increasing mechanism 50 is configured as described above, and the driving force transmitted to the rotor support member 20 attached to the output shaft 11 is transmitted to the planetary gear 53 via the support shaft 54. The ring gear 52 is driven while rotating around the sun gear 51 while rotating around the sun gear 51. As a result, the rotor 30 to which the ring gear 52 is attached is driven to rotate at a rotational speed that is approximately 1.5 to 2 times the rotational speed of the rotor support member 20, that is, the output shaft 11. In this way, the rotor 30 is accelerated, but the rotor support member 20 that rotatably supports the rotor 30 is also rotating at a rotational speed of about 1 / 1.5 to 1/2 of the rotor 30. Since the relative speed difference between the two is about 1 / 1.5 to 1/2 compared with the conventional one in which the rotor 30 is supported by the fixed member, the rotor 30 is disposed between the rotor support member 20 and the rotor 30. Further, the durability of the bearing 25 can be improved.
[0015]
  Next, the magnet housing 60 disposed facing the braking portion 33 of the rotor 30 and the magnet means 70 accommodated in the magnet housing 60 will be described.
  The magnet housing 60 includes an attachment member 61 and a hollow annular housing body 62 that is integrally formed on the outer periphery of the attachment member 61. The attachment member 61 is formed in a disc shape, and the sun gear 51 is fastened to the case 15 of the transmission 10 together with the fastening bolt 16 at the inner peripheral side end thereof. The hollow annular housing body 62 includes an inner peripheral wall 621, an outer peripheral wall 622, a right end wall 623, a left end wall 624, and an intermediate wall 625 formed so as to protrude upward from the left end in the drawing of the outer peripheral wall 622. 622 is arranged to face the inner peripheral surface of the annular braking portion 33 constituting the rotor 30 with a slight gap. The outer peripheral wall 622 and the right end wall 623 constituting the housing body 62 are formed of a magnetic insulating material such as aluminum, for example, a nonmagnetic material, and the outer peripheral wall 622 has a predetermined circumferential direction as shown in FIG. A plurality of windows 622a are formed at intervals. The plurality of windows 622a are provided with pole pieces 626 made of a ferromagnetic material. Preferably, the pole piece 626 is formed when the outer peripheral wall 622 is molded.Cast. A lid plate 627 is attached to the upper ends of the right end wall 623 and the intermediate wall 625 by mounting bolts 628.
[0016]
  The magnet means 70 is provided with a first magnet support disposed at a position facing the pole piece 626 mounted on the outer peripheral wall 622, the inner peripheral surface being fitted to the outer peripheral surface of the inner peripheral wall 621. A cylinder 71 and a second magnet support cylinder 72 are provided. The first magnet support cylinder 71 is made of a magnetic material, and is fixed to the right end wall 623 by a fixing pin 629. The second magnet support cylinder 72 is formed of a magnetic material, and a cylindrical sliding member 630 in which stainless steel is coated with, for example, Teflon (trade name), which is a material having a small friction coefficient, is mounted on the lower surface thereof. The outer peripheral surface of the inner peripheral wall 621 is slidable in the circumferential direction. On the outer peripheral surface of the first magnet support cylinder 71, a first permanent magnet group including a plurality of permanent magnets 73 provided around the pole piece 626 is mounted. The permanent magnet 73 has an inner surface joined to the first magnet support cylinder 71 and an outer surface facing the pole piece 626 as magnetic poles, and the outer surface is arranged so that the N and S poles alternate. ing. Further, the outer peripheral surface of the second magnet support cylinder 72 is also provided with the same interval as the interval between the plurality of permanent magnets 73 constituting the first permanent magnet group.ArrangedA second permanent magnet group consisting of a plurality of permanent magnets 74 is mounted. The permanent magnet 74 also has an inner surface joined to the second magnet support cylinder 72 and an outer surface facing the pole piece 626 as magnetic poles, and the polarity of the outer surface is arranged so that the N and S poles are alternately arranged. Has been. The permanent magnets 73 and 74 constituting the first permanent magnet group and the second permanent magnet group are made of a rare earth such as neodymium having a light weight and a strong magnetic force.
[0017]
An arm 75 is attached to the second magnet support cylinder 72 at the left end in FIG. The arm 75 is connected to a magnet actuated actuator (not shown). A magnet actuating actuator (not shown) slides the second magnet support cylinder 72 on the outer peripheral surface of the inner peripheral wall 621 in the circumferential direction. The operation amount of the second magnet support cylinder 72 by the magnet operation actuator is equal to one pitch of the plurality of permanent magnets 74 constituting the second permanent magnet group disposed in the second magnet support cylinder 72. Is set.
[0018]
  IllustratedBasic formThe eddy current type speed reducer is configured as described above, and its operation will be described below.
  First, the braking operation will be described. The second magnet support cylinder 72 is rotated in one direction by a magnet actuating actuator (not shown), and each permanent magnet 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support cylinder 71, When each permanent magnet 74 of the second permanent magnet group mounted on the outer periphery of the second magnet support cylinder 72 adjacent to each permanent magnet 73 is positioned in the same polarity as shown in FIG. The action is performed.
[0019]
Hereinafter, the braking action will be described with reference to FIGS. 3 and 4.
As shown in FIGS. 3 and 4, each permanent magnet 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support tube 71 and the outer periphery of the second magnet support tube 72 are mounted. Each permanent magnet 74 of the second permanent magnet group is adjacent to the circumferential direction of the braking portion 33 because the N pole and the S pole are alternately arranged along the circumferential direction of the braking portion 33 of the rotor 30. The magnets to be magnetized are magnetically insulated by the outer peripheral wall 622 of the housing main body 62 which is disposed between the first permanent magnet group and the second permanent magnet group and the braking portion 33 and formed of a nonmagnetic material. A pole piece 626 made of a ferromagnetic material is magnetically connected to the braking portion 33 of the rotor 30 using a magnetic path. As a result, magnetic circuits 77 and 77 passing through the first magnet support cylinder 71 and the second magnet support cylinder 72 on the fixed side and the braking portion 33 of the rotor 30 on the rotation side are formed. Accordingly, an eddy current is generated on the inner peripheral surface of the braking portion 33 due to the relative speed difference between the first magnet supporting cylinder 71 and the second magnet supporting cylinder 72 and the braking portion 33 of the rotor 30, and the braking portion 33 receives the braking torque. .
[0020]
At the time of braking, the rotor 30 is driven to rotate at a rotational speed of about 1.5 to 2 times the rotational speed of the output shaft 11 by the action of the speed increasing mechanism 50 as described above. When the magnetic forces of the permanent magnets 73 and 74 are the same as that of the direct connection, a braking torque of about 2 to 4 times is obtained. Although the amount of heat generated by the rotor 30 increases due to this increase in braking torque, the radiating fins 34 attached to the rotor 30 also have a rotational speed that is approximately 1.5 to 2 times that of the rotor 30 directly connected to the output shaft 11. Therefore, the cooling efficiency of the rotor 30 is also about 1.5 to 2 times, and the rotor 30 can be prevented from being overheated. Further, even if the rotor 30 is accelerated as described above, the rotor support member 20 that rotatably supports the rotor 30 also rotates at a rotational speed of 1 / 1.5 to 1/2 of the rotor 30. Since the relative rotational speed difference between the two is about 1 / 1.5 to 1/2 compared to the conventional one in which the rotor 30 is supported by the fixed member, the rotor 30 is disposed between the rotor support member 20 and the rotor 30. The durability of the bearing 25 thus made can be improved.
[0021]
Next, the braking release operation will be described.
From the state shown in FIGS. 3 and 4, the second magnet support cylinder 72 is rotated in the other direction by a magnet actuating actuator (not shown). Each permanent magnet 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support cylinder 71 and the outer periphery of the second magnet support cylinder 72 adjacent to each permanent magnet 73 are mounted. When each permanent magnet 74 of the second permanent magnet group is positioned in a different polarity as shown in FIG. 5, the braking action is released.
[0022]
Hereinafter, the reason why the braking action is released will be described with reference to FIGS. 5 and 6.
As shown in FIGS. 5 and 6, each permanent magnet 73 of the first permanent magnet group mounted on the outer peripheral surface of the first magnet support cylinder 71, and a second magnet adjacent to each permanent magnet 73, respectively. Since each permanent magnet 74 of the second permanent magnet group mounted on the outer periphery of the support cylinder 72 has a different polarity, it is magnetically connected via the pole piece 626 and passes through the pole piece 626. A magnetic short circuit 78 is formed. Therefore, the magnetic field acting perpendicularly to the inner surface of the braking portion 33 of the rotor 30 is extremely weak, so that no braking torque is generated in the braking portion 33 and the braking action is released.
[0023]
  Then configured according to the present inventionAn embodiment of an eddy current reduction deviceWill be described with reference to FIG.The eddy current type speed reducer in the present invention isA clutch that selectively engages or disengages them is disposed between the sun gear 51 and the magnet housing 60 that is a fixing member, and other configurations are shown in FIGS.Basic formTherefore, the same members are denoted by the same reference numerals, and detailed description thereof is omitted. In the embodiment shown in FIG. 7, the clutch comprises a multi-plate friction clutch 80.
  In the eddy current reduction device shown in FIG. 7, the outer periphery of the sun gear support member 56 in which the sun gear 51 constituting the speed increasing mechanism 50 is attached to the case 15 of the transmission 10 as a fixing member by the fastening bolt 16. It is rotatably supported via a bearing 25 on the top. At the left end portion of the sun gear 51 in FIG. 7, a first clutch plate support portion 81 having a spline 811 for constituting the multi-plate friction clutch 80 is provided. The mounting member 61 of the magnet housing 60, which is a fixed member, is provided with a second clutch plate support portion 82 provided with a spline 821 so as to face the first clutch plate support portion 81. The first clutch plate support portion 81 and the second clutch plate support portion 82 have a plurality of first clutch plates 83 and a plurality of second clutch plates 84 alternately in the axial direction (left and right in FIG. 7). Slidable in the direction).
[0024]
  In the illustrated embodiment, the eddy current type speed reducer includes the multi-plate friction clutch 80.FIG.In FIG. 2, a clutch actuating actuator 85 that pushes in the right direction is provided. The clutch actuator 85 is disposed on the attachment member 61 of the magnet housing 60. The clutch actuating actuator 85 includes a cylinder 86 provided on the mounting member 61 so as to face the multi-plate friction clutch 80, a piston 87 slidably disposed in the cylinder 86, It consists of a piston rod 88 projecting from the end face of the multi-plate clutch 80 side (right side in FIG. 7). The clutch actuating actuator 85 configured in this way is connected to a hydraulic pressure or compressed air operating circuit (not shown) such as a working chamber 89 formed on the left side of the piston 87 in the cylinder 86 in FIG. Accordingly, when fluid pressure acts on the working chamber 89, the piston 87 moves to the right in FIG. 7 and presses the first clutch plate 83 and the second clutch plate 84 via the piston rod 88 to both Are frictionally engaged. When the first clutch plate 83 and the second clutch plate 84 are frictionally engaged, the sun gear 51 is integrated and fixed with the mounting member 61 of the magnet housing 60 which is a fixing member.
[0025]
  The eddy current type speed reducer shown in FIG. 7 is configured as described above, and its operation will be described below.
  When fluid pressure is applied to the working chamber 89 of the clutch actuating actuator 85, the first clutch plate 83 and the second clutch plate 84 are frictionally engaged to fix the sun gear 51 as described above. When the sun gear 51 is fixed, the speed increasing mechanism 50 functions in the same manner as the basic form shown in FIGS. 1 to 6, and the rotor 30 has a rotational speed about 1.5 to 2 times the rotational speed of the output shaft 11. Can be rotated. At this time, the magnet means 70 is brought into the state shown in FIGS.If positionedAs described above, braking torque is generated.
[0026]
Next, a case where braking is released will be described.
When releasing the brake, if the magnet means 70 is positioned in the state shown in FIGS. 5 and 6, the braking action is released as described above. In order to cool the rotor 30 that has generated heat due to the braking action even after the braking action is released, the clutch actuating actuator 85 continues to operate for a predetermined time and the rotor 30 continues to rotate. In this way, if the rotation of the rotor 30 is continued for a predetermined time after releasing the brake, it is determined that the rotor 30 has cooled, and the fluid pressure acting on the working chamber 89 of the clutch actuating actuator 85 is released. As a result, the friction engagement between the first clutch plate 83 and the second clutch plate 84 is released, and the sun gear 51 can rotate with respect to the sun gear support member 56. Accordingly, the planetary gear 53 and the sun gear 51 idle, and the rotor 30 is not driven, so that no braking torque is generated. At this time, by positioning the magnet means 70 in the state shown in FIG. 3 and FIG. 4, the rotation of the rotor 30 is prevented by the magnetic force of the magnet means 70. In this way, during normal driving of the vehicle, the engagement of the multi-plate friction clutch 80 is disengaged and the rotor 30 is stopped, thereby preventing deterioration of fuel consumption due to the wind-off resistance of the radiating fins 34 caused by the rotation of the rotor 30. In addition, it is possible to prevent wind noise from being generated by the radiating fins 34. Note that the seal 37 mounted between the ring gear 52 and the sun gear 51 eliminates the relative rotational speed difference when the engagement of the multi-plate friction clutch 80 is released, so that the durability is improved.
[0027]
Next, still another embodiment of the eddy current type speed reducer configured according to the present invention will be described with reference to FIGS. 8 and 9 is different from the embodiment shown in FIG. 7 in the magnet housing 60, the magnet means 70 accommodated in the magnet housing 60, and the clutch 80. Since other configurations are substantially the same as those of the embodiment shown in FIG. 7, the same reference numerals are given to the same members, and detailed descriptions thereof are omitted.
The magnet housing 60 in the eddy current type reduction gear shown in FIGS. 8 and 9 is opposed to the outer peripheral wall 622a constituting the hollow annular housing body 62, that is, the inner peripheral surface of the annular braking portion 33 constituting the rotor 30. The outer peripheral wall 622a is formed of a thin plate made of a nonmagnetic material. The outer peripheral wall 622a is formed in a cylindrical shape with a thickness of about 0.5 to 1.0 mm using, for example, austenitic stainless steel, aluminum, a heat-resistant synthetic resin, a carbon material containing reinforcing fibers, and the like by a fixing means such as a bolt. The housing body 62 is connected by a right end wall 623 and an intermediate wall 625. As described above, in the eddy current type speed reducer shown in FIGS. 8 and 9, the pole piece in the embodiment shown in FIG. 7 is formed by forming the outer peripheral wall 622a constituting the housing body 62 from a thin plate made of a nonmagnetic material. 626 can be removed.
[0028]
The magnet means 70 includes a magnet support cylinder 72a made of a ferromagnetic material whose inner peripheral surface is fitted to the outer peripheral surface of the inner peripheral wall 621 constituting the housing body 62, and the magnet support cylinder 72a is axially (see FIG. 8 is slidable in the left-right direction). A permanent magnet group composed of a plurality of permanent magnets 74a is attached to the outer peripheral surface of the magnet support cylinder 72a in the circumferential direction. In the permanent magnet 74a, an inner surface joined to the magnet support cylinder 72a and an outer surface facing the inner peripheral surface of the annular braking portion 33 constituting the rotor 30 via the outer peripheral wall 622a serve as magnetic poles. The polarity is arranged so that the N pole and the S pole are alternated. An operating rod 75a is attached to the left end of the magnet support cylinder 72a in FIG. The actuating rod is connected to a magnet actuating actuator (not shown).
[0029]
8 and 9, the clutch disposed between the sun gear 51 and the sun gear support member 56, which is a fixed member that rotatably supports the sun gear 51, is a synchronous mesh clutch. 80a.
A dog tooth 81a and a cone surface 82a are provided at the left end of the sun gear 51 in FIG. A synchronization ring 83a having teeth 831a on the outer periphery is disposed on the cone surface 82a. On the other hand, the sun gear support member 56 that is a fixing member is provided with a clutch hub 84a at a position facing the dog teeth 81a and the synchronization ring 83a. An external spline 841a is formed on the outer periphery of the clutch hub 84a, and a clutch sleeve 85a having an internal spline 851a is slidably fitted in the axial direction (left and right in FIG. 8) on the external spline 841a. Has been. An annular groove 852a is provided on the outer periphery of the clutch sleeve 85a, and one end of the clutch fork 86a is engaged with the annular groove 852a. The other end of the clutch fork 86a is connected to a clutch operating actuator (not shown). Note that the above-described synchronous mesh clutch 80a may have substantially the same configuration as that of the synchronous gear clutch for shift speed switching that is generally provided in a transmission mounted on a vehicle.
[0030]
The eddy current type speed reducer shown in FIGS. 8 and 9 is configured as described above, and its operation will be described.
In the case of braking by the eddy current type speed reducer, a clutch operating actuator (not shown) is operated from the state shown in FIG. 8, and the clutch sleeve 85a is moved rightward in FIG. 8 via the clutch fork 86a. When the clutch sleeve 85a moves rightward in FIG. 8, the chamfer formed on the end surface of the internal spline 851a of the clutch sleeve 85a and the chamfer formed on the end surface of the tooth 831a provided on the outer periphery of the synchronization ring 83a are engaged. Accordingly, the synchronization ring 83a is moved rightward in FIG. Accordingly, the inner peripheral surface of the synchronization ring 83a is pressed against the cone surface 82a, and the rotation of the sun gear 51 is stopped by the frictional force. When the rotation of the sun gear 51 stops, the clutch sleeve 85a rotates away from the synchronizing ring 83a by an angle corresponding to half the tooth width in the circumferential direction, and meshes with the dog teeth 81a as shown by a two-dot chain line in FIG. To do. As a result, the sun gear 51 is integrated and fixed with the attachment member 61 of the magnet housing 60 which is a fixing member. When the sun gear 51 is fixed, the speed increasing mechanism 50 functions in the same manner as in the embodiment of FIG. 7, and the rotor 30 is rotationally driven at a rotational speed of about 1.5 to 2 times the rotational speed of the output shaft 11. I'm damned. At this time, if a magnet actuating actuator (not shown) is actuated so that the magnet support cylinder 72a and the permanent magnet 74a are positioned at a braking position indicated by a solid line in FIG. 8, a braking action is performed. That is, when the magnet support cylinder 72a and the permanent magnet 74a are positioned at the braking position, the permanent magnet 74a applies a magnetic field to the annular braking portion 33 constituting the rotor 30 through the thin outer peripheral wall 622a made of a nonmagnetic material. 9, a magnetic circuit 77a is formed between the braking portion 33 and the magnet support cylinder 72a. Therefore, when the rotating braking unit 33 crosses the magnetic field, an eddy current is generated in the braking unit 33, and the braking unit 33 receives a braking torque.
[0031]
Next, a case where braking is released will be described.
From a braking state indicated by a solid line in FIG. 9, a magnet actuating actuator (not shown) is operated to position the magnet support cylinder 72a and the permanent magnet 74a at a braking release position indicated by a two-dot chain line in FIG. When the magnet support cylinder 72a and the permanent magnet 74a are positioned at the braking release position, the permanent magnet 74a does not face the annular braking portion 33 constituting the rotor 30, so that the braking portion 33 does not receive braking torque.
If the braking action is released, the synchronous meshing clutch 80a is maintained in meshing state for a predetermined time and the rotation of the rotor 30 is continued as in the embodiment shown in FIG. Then, if the rotation of the rotor 30 continues for a predetermined time after releasing the brake, it is determined that the rotor 30 has cooled, and a clutch operating actuator (not shown) is operated to move the clutch sleeve 85a from the position indicated by the two-dot chain line in FIG. And move to the non-braking position indicated by the solid line. As a result, the sun gear 51 can rotate with respect to the sun gear support member 56, the planetary gear 53 and the sun gear 51 idle, and the rotor 30 is not driven, so that no braking torque is generated. At this time, by positioning the magnet means 70 in the state shown in FIG. 8, the rotation of the rotor 30 is prevented by the magnetic force of the magnet means 70. In this way, during normal driving of the vehicle, the meshing of the synchronous meshing clutch 80a is released and the rotor 30 is stopped, thereby preventing deterioration of fuel consumption due to wind-off resistance of the radiating fins 34 caused by the rotation of the rotor 30. The occurrence of wind noise due to the heat radiation fins 34 can be prevented.
[0032]
Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the embodiment, and various modifications are possible within the scope of the technical idea of the present invention. For example, in the illustrated embodiment, an example in which a permanent magnet is used as the magnet device 70 is shown, but an electromagnet may be used.
[0033]
【The invention's effect】
Since the eddy current type speed reducer according to the present invention is configured as described above, the following effects can be obtained.
[0034]
  That is,Forms the basic form of the present inventionThe eddy current type speed reducer includes a rotor driven by a rotating shaft, magnet means arranged to face the rotor and having a plurality of magnets, and the rotational speed of the rotating shaft is increased and transmitted to the rotor.A planetary gear type speed increasing mechanism, and a planetary gear type speed increasing mechanism is provided with a rotor support member attached to the rotating shaft to which the planetary gear is mounted and rotatably supporting the rotor. .The rotor is accelerated by a speed increasing mechanism. Since the rotor support member that rotatably supports the rotor is also rotated integrally with the rotation shaft, the relative rotational speed difference between the rotor and the rotor support member is the rotor. Therefore, the durability of the bearing disposed between the rotor support member and the rotor can be improved.
  Further, in the present invention, the sun gear of the planetary gear type speed increasing mechanism is rotatably supported by the fixed member, and a clutch that selectively engages the sun gear is provided. When the clutch is engaged and the sun gear is fixed to the fixed member, the rotor can be increased in speed and rotated. When the clutch is disconnected, the rotor stops rotating. Therefore, during normal driving of the vehicle, the clutch can be disconnected to eliminate the air resistance caused by the rotation of the rotor, thereby improving the fuel consumption of the vehicle, reducing noise, and improving the durability of seals and bearings. It is possible.
[Brief description of the drawings]
[Figure 1]An eddy current type speed reducer constituting the basic form of the present inventionFIG.
FIG. 2 is a partial perspective view showing a magnet housing and magnet means constituting the eddy current reduction device shown in FIG.
FIG. 3 is a partial perspective view of magnet means in a braking state of the eddy current type speed reducer shown in FIG.
4 is a cross-sectional view taken along line AA in the braking state of the eddy current type reduction gear shown in FIG.
FIG. 5 is a partial perspective view of the magnet means in the non-braking state of the eddy current type reduction gear shown in FIG.
6 is a cross-sectional view of the main part of the eddy current type speed reducer shown in FIG. 1 in a non-braking state.
FIG. 7 shows an eddy current type speed reducer constructed according to the present invention.One implementationThe principal part sectional drawing which shows a state.
FIG. 8 is an eddy current reduction device constructed according to the present invention.OtherThe principal part sectional view showing an embodiment.
FIG. 9 is a cross-sectional view taken along line BB in the braking state of the eddy current type reduction gear shown in FIG.
[Explanation of symbols]
    10: Transmission
    11: Output shaft of transmission
    20: Rotor support member
    21: Support portion of rotor support member
    22: Mounting portion of rotor support member
    30: Rotor
    31: Supported portion of the rotor
    32: End wall of the rotor
    33: Braking part of the rotor
    34: Radiator fin of rotor
    36, 37: Seal
    50: Speed increasing mechanism
    51: Sun gear
    52: Ring gear
    53: Planetary gear
    60: Magnet housing
    61: Mounting member for magnet housing
    62: Housing body of magnet housing
  626: Pole piece
    70: Magnet means
    71: 1st magnet support cylinder of a magnet means
    72: Second magnet support cylinder of the magnet means
    73, 74: Permanent magnet
    80: Multi-plate friction clutch
    81: First clutch plate support
    82: Second clutch plate support
    83: First clutch plate
    84: Second clutch plate
    85: Clutch actuation actuator
    86: Cylinder actuator actuator cylinder
    87: Piston for clutch actuator
    88: Piston rod of the clutch actuator
    89: Operating chamber of the clutch actuator
  80a: Synchronous meshing clutch
  81a: dog teeth of synchronous mesh clutch
  82a: Cone surface of synchronous mesh clutch
  83a: Synchronous engagement clutch synchronization ring
  84a: Clutch hub of synchronous mesh clutch
  85a: Clutch sleeve of synchronous mesh clutch
  86a: Clutch fork of synchronous mesh clutch

Claims (3)

A rotor driven by a rotating shaft;
Magnet means provided with a plurality of magnets arranged opposite to the rotor;
An eddy current reduction device comprising: a speed increasing mechanism that speeds up and transmits the driving force of the rotating shaft to the rotor;
The speed increasing mechanism includes a sun gear attached to a fixed member, a ring gear attached to the rotor, a rotor support member attached to the rotating shaft and rotatably supporting the rotor, and the rotor support member. A planetary gear mounted and meshed with the sun gear and the ring gear;
The sun gear is rotatably supported by the fixed member, and includes a clutch that selectively engages the sun gear and the fixed member. apparatus. The eddy current type reduction gear according to claim 1, wherein the clutch is a friction clutch . The eddy current type speed reducer according to claim 1, wherein the clutch is a synchronous mesh clutch .

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