JP2577351Y2 - Rotor of eddy current type reduction gear - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an eddy current type reduction gear used for large vehicles such as buses, trucks and construction equipment.

[0002]

2. Description of the Related Art As a deceleration device or a braking device for a large vehicle, a foot brake as a main brake, an exhaust brake as an auxiliary brake, and a deceleration device that performs stable deceleration when descending on a long hill, etc. An eddy current type speed reducer for preventing burnout is used.

The above-mentioned eddy current type speed reducer includes an electromagnet in which an electromagnetic coil is wound around an iron core as a magnetic pole and a permanent magnet as a magnetic pole. In the former, a large number of the magnetic poles are arranged on both sides of the disk, a magnetic field is generated by energizing from a battery power supply, and a torque is generated in a direction to decelerate the disk by an eddy current phenomenon to obtain a braking force. The latter is installed around the support ring so that the polarities of the adjacent permanent magnets are opposite to each other, and this support ring can move back and forth from the position where the magnetic pole surface faces the rotor to the position where it is magnetically separated via the required gap. An eddy current phenomenon is generated by a magnetic field generated from a permanent magnet at a position where a magnetic pole surface faces the rotor, and a torque is generated in a direction to decelerate the rotor to obtain a braking force.

In the above eddy current type speed reducer, the kinetic energy absorbed when the vehicle is decelerated during use is dissipated through the rotor, so that the temperature of the rotor increases as the frequency of use increases. The rise in the temperature of the rotor not only reduces the braking efficiency of the reduction gear, but also lowers the mechanical strength.Therefore, a number of cooling fins are installed on the outer peripheral surface of the rotor, and the cooling capacity of the rotor is increased by increasing the surface area of the rotor. A device for raising the temperature and suppressing a rise in the temperature of the rotor has conventionally been made.

[0005]

As described above, in the conventional eddy current type speed reducer, the rotor is provided with a ring-shaped cooling fin in order to suppress a rise in the temperature of the rotor.
Depending on the use conditions, the temperature reached a high temperature of 600 ° C. or more, the rotor was thermally deformed, and the braking efficiency was reduced.

On the other hand, in order to solve the above-mentioned problem, a rotor with an increased cooling capacity has been devised (for example, Japanese Utility Model Laid-Open No. 3-54376, Japanese Utility Model Laid-Open No. 4-1478).
No. 2). In these, a large number of cooling fins bent in a V-shape in the rotating direction are circumferentially arranged at equal intervals on the outer peripheral surface of the rotor, and the cooling air is forced from both side ends of the fin toward the inward bent portion. The cooling air flows upward and is discharged upward from the refraction portion, during which the cooling air efficiently exchanges heat with the cooling fin and the outer peripheral surface of the rotor cylindrical portion, thereby suppressing a rise in the temperature of the rotor.

[0007] However, the rotor of the eddy current type speed reducer has excellent cooling ability, but has a large energy loss due to air resistance during rotation, so that the driving force of the vehicle is reduced during normal running, or the fuel efficiency is reduced. There is a problem that the noise becomes worse, and further, there is a drawback that the wind noise is loud and noise is generated.

In view of the above situation, the present invention secures the required flow rate of cooling air under low resistance and low noise by arranging fan blades with low resistance and low noise against the flow of cooling air during rotation. In addition, at the same time, a cooling fin is provided between adjacent fan blades to provide a rotor of the eddy current type speed reducer in which sufficient cooling performance is ensured.

[0009]

In order to achieve the above object,
Therefore , in this invention, a rotor is fitted to one end of the rotating shaft, and a supporting ring around which a plurality of electromagnets or permanent magnets are provided so that the polarities of the adjacent magnets are opposite to each other is set to the extreme surface of these magnets. In the eddy current type speed reducer provided so as to be magnetically opposed to the rotor with a required air gap, a plurality of the rotors having a predetermined stagger angle with respect to the rotation axis direction of the rotor in one half of the outer peripheral surface of the cylindrical portion of the rotor. Fan blades at equal intervals , and attach the inner end of each fan blade to the rotor.
By extending the cylindrical portion outer peripheral surface to the other side half portion side, further rotor
A large number of cooling fins having the same stagger angle as the fan blade are provided on the other half of the outer peripheral surface of the cylindrical portion of the adjacent fan blade.
The middle end, and the inner end is the inner end of the fan blade
It extends so as to face the composed disposed.

In addition, a rotor is fitted to one end of the rotating shaft, and a supporting ring around which a plurality of electromagnets or permanent magnets are provided so that the polarities of adjacent magnets are opposite to each other is formed. In an eddy current reduction device provided so as to be magnetically opposed to the rotor with a required gap, a predetermined stagger angle is maintained on the outer peripheral surface of the cylindrical portion of the rotor with respect to the rotation axis direction of the rotor, and both ends of the rotor are A number of fan blades that match or protrude from the end face of the cylindrical part are arranged at equal intervals, and one or two sheets of cooling are provided at the center of the outer peripheral surface of the cylindrical part where the temperature is the highest between adjacent fan blades. Fins are arranged.

[0011]

According to the present invention, since the fan blades having a predetermined stagger angle with respect to the rotation axis direction of the rotor are disposed on the outer peripheral surface of the cylindrical portion of the rotor, when the rotor rotates, the fan blade flows in from one of the fan blades. Cooling air is exhausted from the other of the fan blades. The cooling air flowing between the fan blades exchanges heat while flowing in contact with the surface of the cooling fins provided between the fan blades outside the surface of the fan blades themselves, thereby preventing a rise in the temperature of the rotor. . In particular, when a cooling fin is provided at the center of the outer peripheral surface of the rotor cylindrical portion which becomes high in temperature, heat conduction to the cooling fin is remarkable, so that efficient heat exchange with cooling air is performed. As a result, it is possible to increase the cooling capacity of the rotor while suppressing the energy loss and noise due to the rotation of the rotor.

[0012] stagger angle of the fan blades relative to the rotational axis of the rotor, so that the fan blades in the inflow direction of the air (relative velocity direction) and the rotational speed of the fan blade for a fan blade in consideration of the inflow velocity of the cooling air is parallel When an angle is selected, the energy loss due to air resistance is minimized, so it is preferable to adopt an angle in the vicinity. Also,
In order to accelerate the inflow velocity of the cooling air, that is, to increase the flow rate, an angle slightly smaller than the minimum loss angle may be employed.

[0013]

Embodiment 1 An embodiment of the present invention will be described with reference to FIGS. 1, 2A and 2B. The mounting disk 7 of the rotor 1 is attached to a support member 17 fitted to one end of the rotating shaft 12 by a plurality of bolts 10.
Attach by In this rotor 1, the outer cylinder 2 and the inner cylinder 3 are opposed to each other with a required space to form a cylindrical portion, and the ends of the outer cylinder 2 and the inner cylinder 3 are connected by a number of arms 4 to form the outer cylinder 2. A large number of fan blades 5 having a required stagger angle θ with respect to the direction of the rotation axis 12 of the rotor are circumferentially arranged on the outer peripheral surface at equal intervals, and are parallel to the fan blades 5 between these adjacent fan blades 5. A cooling fin 6 and a mounting disk 7 on one end face of the inner cylinder 3.

As shown in FIGS. 2A and 2B, the relative positional relationship between the fan blades 5 and the cooling fins 6 is such that the rotor is located on the left half of the outer peripheral surface of the cylindrical portion of the rotor (the outer peripheral surface of the outer cylinder 2). A number of fan blades 5 maintaining a predetermined stagger angle θ with respect to the direction of the rotation axis 12 are arranged at equal intervals, and the inner end portion of each fan blade 5 is moved toward the right half of the outer peripheral surface of the cylindrical portion of the rotor. Extend the outer peripheral surface of the cylindrical portion of the rotor (the outer peripheral surface of the outer cylinder 2)
A number of cooling fins 6 having the same stagger angle θ as that of the fan blades are located at the middle of the adjacent fan blades 5 at the right half thereof, and the inner end portions face the inner end portions of the fan blades 5. So that it is extended.

In the space between the outer cylinder 2 and the inner cylinder 3, a support ring 14 having a width corresponding to the length of the cylinder is interposed. The support ring 14 is supported by a plurality of guide rods 18 which are attached to a support plate 16 which is rotatably supported on the rotary shaft 12 via a bearing 15 and which are protruded in the axial direction of the rotary shaft 12.
Is moved forward and backward by the cylinder 11 so that the length from the position facing the cylindrical portion of the rotor to the position magnetically displaced is provided so as to be freely movable. A plurality of permanent magnets 9 made of rare earth magnets are provided on the outer peripheral surface of the support ring 14 such that the adjacent magnets have opposite polarities. The permanent magnet group is housed in a shield case 13 attached to a support plate 16.

[0016] In the eddy current type reduction gear shown in Example 2 in Example 1, FIG. 2
(A) Instead of the fan blades 5 and the cooling fins 6 in (B),
The case where the long fan blades 5 and the short cooling fins 6 are combined will be described with reference to FIGS. A large number of fan blades 5 are provided on the outer peripheral surface of the cylindrical portion of the rotor (the outer peripheral surface of the outer cylinder 2) at a predetermined stagger angle θ with respect to the rotation axis direction of the rotor, and both end portions protrude from the end surface of the cylindrical portion of the rotor. The cooling fins 6 are arranged at intervals, and short cooling fins 6 are arranged in the central portion of the outer peripheral surface of the cylindrical portion (the outer peripheral surface of the outer cylinder 2) where the temperature is highest between the adjacent fan blades 5.

FIG . 4A shows a modification of the case where the long fan blades 5 and the short cooling fins 6 shown in FIGS. 3A and 3B are combined.
It is shown in (B). In this case, a large number of fans having a predetermined stagger angle θ with respect to the rotation axis direction of the rotor on the outer peripheral surface of the cylindrical portion of the rotor (the outer peripheral surface of the outer cylinder 2), and having both ends coinciding with the end surfaces of the cylindrical portion of the rotor. The wings 5 are arranged at equal intervals,
Two short cooling fins 6 are arranged at the center of the outer peripheral surface of the cylindrical portion (the outer peripheral surface of the outer cylinder 2) where the temperature is highest between the adjacent fan blades 5.

In the eddy current type reduction gear transmission shown in the first and second embodiments, for example, a mounting bracket (not shown) provided on a support plate 16 is attached to a vehicle body, and a rotating shaft 12 is connected to a propeller shaft. used.

In the above eddy current type speed reducer, when the support ring 14 is retracted and the permanent magnet group is magnetically separated from the cylindrical portion of the rotor 1, no eddy current flows in the rotor 1. , The rotor 1 is rotating at a predetermined torque and is in a so-called braking OFF state.

When the cylinder 11 is operated in the braking OFF state, the support ring 14 advances with the advance of the rod 8, and the permanent magnet 9 faces the entire inner peripheral surface of the outer cylinder 2 of the rotor with a predetermined gap. . Then, a magnetic circuit is formed between the adjacent permanent magnet 9, the outer cylinder 2, and the support ring 14, and a so-called braking ON state is generated. The maximum braking torque is generated, and the vehicle is greatly decelerated.

When the above braking operation is repeated, a large amount of heat is generated in the speed reducer, and the amount of heat tends to be accumulated in the outer cylinder 2 of the cylindrical portion of the rotor. Cooling air flows in, heat is efficiently exchanged on the surface of the cooling fin 6 provided at the center of the outer cylinder 2 having the highest temperature between the surface of the fan blade 5 and the adjacent fan blade 5, and the rotor 1 Is sufficiently cooled.

An eddy current type speed reducer according to the embodiment of the present invention shown in FIGS. 1 and 2 and a conventional cooling fin bent into a V-shape instead of the fan blade 5 and the cooling fin 6 in the apparatus of FIG. The eddy current type speed reducer having the same mechanism as that shown in FIG. 1 was mounted on each of 10-ton trucks, and the temperature rise, rotational resistance and noise of the cylindrical portion of the rotor were examined. The results are shown in FIGS. 5, 6 and 7. FIG. 5 shows that both cooling effects are the same. FIG.
As can be seen from FIG. 7, the embodiment of the present invention has a smaller rotational resistance than the comparative example, so that the rotational loss is small. Therefore, it can be seen that the rotor according to the present invention has excellent cooling capacity as well as the rotor provided with the V-shaped bent cooling fin, and furthermore, the rotational resistance and the noise are largely suppressed.

[0023]

According to the present invention, the cooling air guided between adjacent fan blades of the fan blade group arranged on the outer peripheral surface of the cylindrical portion of the rotor has the largest accumulation of heat generated by braking. The heat exchange can be performed efficiently by contacting the cooling fin provided in the large portion, and the excellent cooling ability is exhibited. . Further, the rotation resistance and noise of the rotor due to the inflow of the cooling air during rotation are extremely small.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is an explanatory view showing a part of a rotor in FIG. 1 in an unfolded state, showing the arrangement of fan blades and cooling fins and the flow of cooling air, wherein A is a plan view and B is a front view.

FIG. 3 is an explanatory view showing a part of a rotor in another embodiment of the present invention and showing arrangement of fan blades and cooling fins, where A is a plan view and B is a front view.

FIG. 4 is an explanatory view showing a part of a rotor in a third embodiment of the present invention and showing arrangement of fan blades and cooling fins, where A is a plan view and B is a front view.

FIG. 5 is a graph showing the cooling capacity of a rotor according to the present invention and a rotor having a V-shaped bent cooling fin of a comparative example, as a function of rotation speed and drum saturation temperature.

FIG. 6 is a graph showing the rotational resistance of a rotor having a V-shaped bent cooling fin according to the present invention and a comparative example, as a relationship between rotational speed and rotational loss.

FIG. 7 is a graph showing the noise at the time of rotation of the rotor according to the present invention and the rotor having the V-shaped bent cooling fin of the comparative example in relation to the rotation speed and the noise level.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Outer cylinder 3 Inner cylinder 4 Arm 5 Fan blade 6 Cooling fin 7 Mounting disk 8 Rod 9 Permanent magnet 10 Bolt 11 Cylinder 12 Rotary shaft 13 Shield case 14 Support ring 15 Bearing 16 Support plate 17 Support member 18 Guide rod θ Stagger angle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 49/02 H02K 9/06

Claims (2)

(57) [Scope of request for utility model registration] 1. A rotor is fitted to one end of a rotating shaft,
An eddy current type deceleration system in which a support ring around which a plurality of electromagnets or permanent magnets are provided so that the polarities of adjacent magnets are opposite to each other is provided so that the pole faces of these magnets are magnetically opposed to the rotor with a required gap. In the apparatus, a number of fan blades having a predetermined stagger angle with respect to the rotation axis direction of the rotor are arranged at equal intervals on one half of the outer peripheral surface of the cylindrical portion of the rotor.
Arrange the inner end of each fan blade and the rotor cylinder.
Extended to the other half of the outer peripheral surface , and the rotor circle
On the other half of the outer peripheral surface of the cylindrical portion, a number of cooling fins having the same stagger angle as the fan blade are provided between the adjacent fan blades.
And the inner end portion is paired with the inner end portion of the fan blade.
An rotor for an eddy current type reduction gear, which is extended so as to face each other. 2. A rotor is fitted to one end of the rotating shaft,
An eddy current type deceleration system in which a support ring around which a plurality of electromagnets or permanent magnets are provided so that the polarities of adjacent magnets are opposite to each other is provided so that the pole faces of these magnets are magnetically opposed to the rotor with a required gap. In the apparatus, a plurality of fan blades which keep a predetermined stagger angle with respect to the rotation axis direction of the rotor on the outer peripheral surface of the cylindrical portion of the rotor and whose both ends coincide with the end surface of the cylindrical portion of the rotor, or project from the end surface. An rotor for an eddy current type speed reducer, wherein one or two cooling fins are disposed at equal intervals, and one or two cooling fins are disposed at a central portion of an outer peripheral surface of a cylindrical portion having the highest temperature between adjacent fan blades.