JPH02276456A - Hysteresis clutch brake - Google Patents

Abstract

PURPOSE:To improve heat radiation effect without leading in cooling medium from the outside and to enlarge usable range in view point of thermal capacity by fixing a heat pipe having identical profile to that of a pole groove section to at least one pole groove section of inside or outside pole structure formed on coupling main body. CONSTITUTION:Since a heat pipe 15 having cross section approximately identical to that of a recess 3b, i.e., a pole groove section, is sticked to the recess 3b in an outside pole structure 1b of a yoke 1, Joule's heat produced through excitation of an exciting coil 2 or frictional heat produced through slippage is transmitted to a sealed pipe 12 adhered to the recess 3b thus heating and evaporating the enclosed working liquid 13. The vapor advances through the cavity of the sealed pipe 12 toward a non-heated portion, i.e., the outer end portion, where it is subjected to heat exchange with the outer air and condensed thus radiating condensation heat. The condensed working liquid 13 is transferred to the side of the outside pole structure 1b where it is heated again and evaporated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to hysteresis clutches and brakes,
In particular, the present invention relates to a cooling structure that can improve cooling efficiency and increase heat capacity without increasing the size of clutches and brakes or introducing a cooling medium from the outside.

[Prior Art] An inner pole structure and an outer pole structure formed on a first connecting body and arranged facing each other across a gap, and an excitation coil that circulates magnetic flux through the inner pole structure and the outer pole structure. , a hysteresis clutch or a hysteresis brake comprising a hysteresis member fixed to the second connecting body, located in the gap between the inner pole structure and the outer pole structure, and facing both pole structures with a gap therebetween; has been known for a long time.

4 and 5 show the structure of a conventional hysteresis brake device. In the figure, (1) is an inner pole structure (la) whose radial hand portion has a U-shape in the cross-sectional shape along the central axis, and which faces within the opening of this U-shaped portion with a gap G in between. and outer pole structure (l
b) shows the yoke which is the first connecting body formed.

This yoke (1) is fixed to a stationary part (not shown).

Inside the U-shaped portion of the yoke (1) is an excitation coil (
2) is stored. Furthermore, an inner pole structure (1a) and an outer pole structure (1b) forming the gap G are also provided.
), as shown in FIG. 3a),
(3b) are formed in a staggered manner with respect to each other.

On the other hand, a hysteresis member (4) made of a disk-shaped ferromagnetic material having a flange-like cylindrical portion (4a) is arranged such that the cylindrical portion (4a) is located approximately in the center of the gap G, The disk portion (4b) is attached to the support (5) with rivets or the like. This support (5) is made of non-magnetic material and has a drive shaft (6) extending through its center.
is fixed to. Further, this drive shaft (6) is arranged on the central axis of the yoke (1), which is the first connection main body, and two bearings (7), (8) in the front and rear are located within the central opening of the yoke (1). ) is rotatably supported on the yoke (1). Note that the hysteresis member (4
) to the support (5), the rotation center axis of the hysteresis member (4) is naturally aligned with the drive shaft (6).
It is made to match the axis of the A cover (9) that covers the side surface of the U-shaped opening of the yoke (1) is fixed to the outer peripheral edge of the support (5) with rivets or the like. The support (5) including the support (5) constitutes the second connection entity. The bearing (7) located on the side of the U-shaped opening within the central opening of the yoke is held between one step within the central opening of the yoke (1) and the support (5). The bearing (8) on the opposite side is held by the other step and is prevented from moving in the axial direction with respect to the yoke (1) and the drive shaft (6) by snap rings (10) and (11).

A conventional hysteresis brake is configured as above,
When the drive shaft (6) rotates, the support (5), hysteresis member (4) and cover (9) move together with the drive shaft (6).
) rotates as a unit. When the excitation coil (2) is excited at this time, magnetic flux flows in the yoke (1) as shown by Φ in Figure 4, and different poles are generated in each boat structure (la) and (lb). Therefore, the cylindrical part (4) of the hysteresis member (4)
In a), magnetic flux flows in the direction shown by arrow A in FIG. Therefore, the cylindrical part (
A hysteresis loop is drawn in 4a), and a transmitted torque proportional to its area acts on the yoke (1) as a braking torque. This hysteresis brake is suitable for tension control, speed control, etc. because the transmitted torque can be easily controlled by exciting current and it exhibits constant slip characteristics.

[Problems to be Solved by the Invention] In the hysteresis brake configured as described above, in addition to heat generation due to excitation of the excitation coil (2), heat generation etc. occur due to hysteresis loss. Heat generation due to hysteresis loss is caused by the higher the rotation of the hysteresis member (4), the more hysteresis loops are drawn per unit time, and the amount of heat generated per unit time increases, and when this becomes excessive, the hysteresis member (4) The surrounding yoke (1), bearings (7), (8), etc. reach high temperatures, causing burnout of the excitation coil (2) and damage or seizure of the bearings (7), (8). Therefore, in order to prevent such a situation from occurring, the range of its use has been limited due to its heat capacity. Also, to increase heat capacity,
It is necessary to introduce the cooling medium from the outside, but in that case, complicated passages and supply equipment for the cooling medium must be provided, which increases costs, and it is necessary to prevent cooling medium leakage. maintenance is required.

Note that this situation also applies to conventional hysteresis clutches.

This invention was made in order to solve the above-mentioned problems, and it is a hysteresis clutch that can enhance the heat dissipation effect and expand the range of use in terms of heat capacity without requiring the introduction of an external cooling medium. Aim to get the brakes.

[Means for Solving the Problems] A hysteresis clutch/brake according to the present invention includes a concave pole groove in at least one of an inner pole structure and an outer pole structure formed in a first connecting body.
A heat pipe whose cross section is the same shape as this pole groove is attached.

[Function] In the present invention, by the action of the heat pipe provided in the pole groove of at least one of the inner pole structure and the outer pole structure, the first The connection main body is cooled, and furthermore, the bearing part is indirectly cooled, and the second connection main body and the hysteresis member are cooled.

[Embodiment] Fig. 1 is a cross-sectional view showing the overall structure of an embodiment of a hysteresis brake according to the present invention, and Fig. 2 is a cross-sectional view taken along line -■. The basic structure and operation of this embodiment are similar to the conventional apparatus shown in FIGS. 4 and 5 described above. Therefore, the same reference numerals are used in FIGS. 1 and 2 for the same or corresponding parts as in the conventional device described above, and detailed explanation thereof will be omitted.

In this example, the recess (3a) which is the pole groove of the inner pole structure (la) and the outer pole structure (1b)
, (3b) has a substantially semi-cylindrical shape, and the recess (3b) of the outer pole structure (lb) has a cross section of the recess (3b).
A hollow sealed tube (12) having substantially the same shape as 3b) is fixed with an adhesive. This sealed tube (12) has an evaporative working fluid (13) such as water, alcohol, or ammonia sealed inside under reduced pressure, and is provided with cooling fins (14) at its outer end that is in contact with the outside air. This constitutes a heat pipe (15).

This embodiment is constructed as described above, and magnetic flux flows in the yoke (1) as shown by Φ in FIG. 1 by feeding power to the excitation coil (2), and each pole structure (la), l
A different polarity occurs in b), and magnetic flux flows in the direction indicated by arrow A in FIG. 2 through the cylindrical portion (4a) of the hysteresis member (4). Therefore, the cylindrical portion (4a) of the hysteresis member (4)
A hysteresis loop is drawn, and a transmission torque proportional to this area acts on the yoke (1). Such an operation is no different from the conventional device described above, and similarly, the yoke (1), The hysteresis member (4) etc. are heated. However, in this embodiment, as described above, the recess (3b) which is the pole groove of the outer pole structure (1b) of the yoke (1) is provided with a heat pipe (having a cross section approximately the same as that of the recess (3b)). Since 15) is attached, the Joule heat generated by the coil (2) and frictional heat due to slip are released to the outside air via this heat pipe (15). In other words, the heat generated in the yoke (1) is propagated to the sealed tube (12) bonded to the recess (3b) of the outer pole structure (1b), and the hydraulic fluid (13) sealed inside the tube (12) is heated. heat up. The working fluid (13) is then heated and evaporated, and the vapor rushes through the cavity in the sealed tube (12) to the outer end, which is the non-heated part, and this liquid has cooling fins (14). At the outer end is a sealed tube (12)
It exchanges heat with the outside air through the air and condenses to become a liquid. During this process, the heat of condensation is released. The working fluid (13), which has undergone heat exchange and has become a liquid, is transferred again to the outer pole structure (lb), which is a heating section, and is heated again and evaporated. By repeating the above cycle, heat is transported and radiated from the inner end of the sealed tube (12) located on the heat generation source side to the outer end exposed to the outside air.

Note that in the above embodiment, the inner pole structure (la
) and the recesses (3a) and (3b), which are the pole grooves of the outer pole structure (1b), are approximately semi-cylindrical, and the sealed tube (12) of the heat pipe (15) fixed here also has the same cross section. The recess (3a), (
3b) is prismatic, the sealed tube (12) of the heat pipe (15)' is also prismatic, as shown in FIG. Further, in the above embodiment, the heat pipe (15) was provided in the recess (3b) of the outer pole structure (lb), but the heat pipe (15) was provided in the recess (3a) of the inner pole structure (1a). Well, see you soon! It may be provided in both the inner and outer recesses (3a) and (3b).

Moreover, although the embodiments applied to a hysteresis brake have been described above, the present invention can be similarly applied to a hysteresis clutch. In that case, both the inner pole structure and the outer pole structure have a rotating structure. Therefore, when a heat pipe is fixed in the pole groove of the outer pole structure, the outer end of the heat pipe and the cooling fins are exposed to the outside air. Due to relative rotation,
The heat transfer rate increases, further increasing the cooling effect.

[Effects of the Invention] As described above, according to the present invention, at least one of the inner pole structure and the outer pole structure of the yoke, which is a heat generation source, has a concave pole groove and a cross-sectional shape that forms a heat pipe between the paths. Since it is attached, it is possible to efficiently cool the yoke and the hysteresis member, which are heated by the Joule heat of the coil, the frictional heat generated when the hysteresis member slips, etc., and the range of use in terms of heat capacity can be greatly expanded.

Moreover, there is no need to introduce a cooling medium from outside,
Complicated coolant passages and supply devices are not required. Also,
By arranging the heat pipe in the pole groove, there is no need to make a hole in the yoke and bury the heat pipe, thereby reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a hysteresis brake which is an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part along the line ■-■, FIG. The figure is a cross-sectional view of a conventional hysteresis brake, and FIG. 5 is a cross-sectional view taken along the line ■-■. In the figure, (1) is the yoke (first connecting body) (la
) is the inner pole structure, (lb) is the outer pole structure,
(2) is an excitation coil, (3a). (3b) is a recess (pole groove), (4) is a hysteresis member, and (15) is a heat pipe. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1

Claims (1)

[Claims] (1) An inner pole structure and an outer pole structure formed in the first connecting body and arranged facing each other across a gap, an excitation coil that circulates magnetic flux through the inner pole structure and the outer pole structure, and In the hysteresis clutch/brake, the hysteresis clutch/brake comprises a hysteresis member that is fixed to a connecting body of 2 and is located in a gap between the inner pole structure and the outer pole structure and faces both pole structures with a gap therebetween. A hysteresis clutch/brake, characterized in that a heat pipe having a cross section having the same shape as the pole groove is attached to a concave pole groove of at least one of the pole structure and the outer pole structure.