JP5440331B2 - Braking device for vehicle - Google Patents

Description

  The present invention relates to a braking device for a vehicle such as an automobile, and more particularly to a braking device for a vehicle that applies a braking force to the rotation of a wheel and collects thermal energy generated by the application of the braking force.

  In recent years, it has been actively proposed to recover thermal energy from a heat source of a vehicle and convert the recovered thermal energy into, for example, electric energy.

  For example, in Patent Document 1 below, a brake caliper that applies a brake to a rotating part to apply a brake, a heat pipe connected to the brake caliper, a thermoelectric conversion element connected to a heat radiation side end of the heat pipe, and a thermoelectric conversion A regenerative brake device including a radiator that is connected to a cooling side surface of the element and a storage battery that is connected to a thermoelectric conversion element is shown. In this regenerative braking device, the frictional heat generated by braking is transmitted to the heating surface of the thermoelectric conversion element via the heat pipe, while the cooling surface of the thermoelectric conversion element is cooled by the radiator, the thermoelectric conversion element is Electric power can be generated by the temperature difference between the heating surface side and the cooling surface side. Therefore, kinetic energy can be recovered as thermal energy (friction heat) by braking and converted into electrical energy.

  Patent Document 2 listed below discloses a thermoelectric power generator that uses heat generated by friction between a disk rotor that rotates in synchronization with the rotation of the axle and a brake pad that is pressed against the disk rotor without synchronizing with the rotation of the axle. A power generation mechanism in which a conversion element is attached to a disk rotor is shown. In this power generation mechanism, since the thermoelectric conversion element is attached to the disk rotor at a position where it does not interfere with the brake pad, the frictional heat generated by braking is transmitted to the high temperature portion of the thermoelectric conversion element via the disk rotor. The low temperature part of the thermoelectric conversion element is air-cooled, and the thermoelectric conversion element generates electric power due to a temperature difference between the high temperature part and the low temperature part.

JP-A-11-220804 JP 2009-269469 A

  By the way, as a thermoelectric conversion means, for example, when recovering thermal energy using a thermoelectric conversion element and converting it into electric energy, generally, there is a temperature difference between the heating side and the cooling side in the thermoelectric conversion element. It is said that the conversion efficiency improves as the value increases. For this reason, when a thermoelectric conversion element is mounted on a vehicle, and the heat energy is recovered and converted into electric energy, the vehicle braking device that generates a braking force by friction is extremely high in that a high temperature can be obtained by the generation of frictional heat. It is valid. However, in order to always generate an appropriate braking force, there is a limit to the temperature at which the vehicle braking device is operated. That is, the vehicle braking device has a characteristic that the coefficient of friction decreases as the temperature of the friction part increases. For this reason, when the vehicle braking device is operated at a high temperature, a phenomenon in which the braking force is reduced, that is, a so-called fade phenomenon occurs.

  Thus, when recovering thermal energy using a thermoelectric conversion element and converting it to electrical energy, the friction generated with the operation of the braking device for the vehicle is considered from the viewpoint of the recovery efficiency of the thermal energy by the thermoelectric conversion element. It is preferable to maintain the vehicle braking device itself at a high temperature without releasing heat. On the other hand, from the viewpoint of properly operating the vehicle braking device, it is preferable to release the generated frictional heat, in other words, to cool the vehicle braking device itself to keep the temperature low.

  Therefore, when using the thermoelectric conversion means (thermoelectric conversion element), frictional heat, that is, heat energy generated by the operation of the vehicle braking device is recovered and converted into electric energy, for example, the vehicle braking device is controlled. It is extremely important to satisfy both conflicting demands for improving the recovery efficiency of thermal energy by the thermoelectric conversion means without reducing the power.

  In this regard, the disk brake units described in Patent Document 1 and Patent Document 2 are excellent in cooling performance, so that the occurrence of a fade phenomenon is suppressed, but the recovery efficiency of thermal energy by the thermoelectric conversion element is sufficient. I can't say that.

  On the other hand, in addition to the disc brake units described in Patent Document 1 and Patent Document 2, a drum brake unit including a brake drum and a brake shoe exists and is widely used as a vehicle braking device. . In this drum brake unit, since the brake drum is structured to be blocked by the backing plate, the frictional heat is less likely to escape as compared to the disc brake unit. However, even when such a drum brake unit is adopted, from the viewpoint of heat energy recovery efficiency, friction heat, that is, frictional friction in the vicinity of the frictional sliding portion where the brake drum and the brake shoe generate frictional heat, that is, It is desirable to recover the thermal energy, and from the viewpoint of conversion efficiency by the thermoelectric conversion means, it is necessary to ensure cooling on the cooling side.

  The present invention has been made in order to cope with the above-described problems. The purpose of the present invention is to appropriately brake the vehicle, collect heat energy generated by braking, and recover electric energy converted from the heat energy. An object of the present invention is to provide a vehicular braking device that efficiently uses the vehicle.

  In order to achieve the above object, a brake that rotates integrally with the wheel in a vehicle braking device that applies a braking force to the rotation of the wheel and collects thermal energy generated by the application of the braking force. Braking force applying means for applying a braking force by friction to the rotation of the wheel by friction engagement between a drum and a brake shoe assembled to a backing plate provided so as not to rotate with respect to the rotation of the wheel; The thermoelectric conversion means that is assembled to the backing plate and converts the thermal energy generated by the friction into electric energy, and is stored in the labyrinth portion formed between the opening side end surface of the brake drum and the backing plate. A heat transfer means for transferring heat energy generated by friction to the thermoelectric conversion means; That. In this case, the heat transfer means may be arranged, for example, in the circumferential direction in which the brake drum rotates.

  In these cases, the heat transfer means includes a first heat transfer member that is provided in the labyrinth portion and transfers heat energy generated by the friction, and heat energy transferred by the first heat transfer member is It is good to comprise from the 2nd heat-transfer member which transfers heat toward a thermoelectric conversion means.

  In this case, each of the first heat transfer member and the second heat transfer member may be a heat transfer element that thermally transports thermal energy from the high temperature portion toward the low temperature portion.

  In this case, the first heat transfer member and the second heat transfer member may be integrally formed. In this case, it is preferable that the heat energy stored in the labyrinth portion is transferred to the first heat transfer member by grease having thermal conductivity.

  In addition, the thermoelectric conversion means is heated by the thermal energy transferred from the labyrinth part through the heat transfer means and the other side is cooled via the backing plate, and the one surface side and the thermoelectric conversion means It is preferable to convert thermal energy into electrical energy according to the temperature difference from the other side. Furthermore, it is preferable to further include a power storage means for storing the electric energy converted from the thermal energy by the thermoelectric conversion means as electric power.

  According to these, in a drum brake unit including a brake drum and a brake shoe, thermoelectric conversion means is assembled to the backing plate, and heat is stored in the labyrinth portion formed between the opening end of the brake drum and the backing plate. A heat transfer means for transferring the heat energy to the thermoelectric conversion means can be arranged in the circumferential direction of the brake drum. In this case, specifically, the heat transfer means includes a first heat transfer member (heat transfer element) provided in the labyrinth portion and heat energy transferred from the first heat transfer member (heat transfer element). The second heat transfer member (heat transfer element) that transfers heat to the thermoelectric conversion means. Thus, the heat transfer means (the first heat transfer member and the second heat transfer member) reliably and quickly stores the heat energy generated by friction adjacent to the friction sliding surface of the brake drum with the brake shoe. From the labyrinth portion, the heat energy can be efficiently recovered and transferred to the thermoelectric conversion means.

  Further, in the thermoelectric conversion means assembled to the backing plate, the heating side is heated by the heat energy transferred from the labyrinth part via the heat transfer means (first heat transfer member and second heat transfer member), and the backing plate is The cooling side is cooled through. Therefore, even when a drum brake unit is employed, a temperature difference can be appropriately generated between the heating side and the cooling side of the thermoelectric conversion means. Can be converted into energy.

  Here, since the drum brake unit has a structure in which the opening side of the brake drum is closed by the backing plate, the heat energy generated by the braking is easily applied to the inside of the brake drum, particularly to the labyrinth portion. Therefore, the heating side of the thermoelectric conversion means is heated for a relatively long time by the heat transfer means (the first heat transfer member and the second heat transfer member) and maintained at a high temperature state. The backing plate is cooled and the cooling side of the thermoelectric conversion means is always cooled. For this reason, since the thermoelectric conversion means can continuously convert heat energy into electric energy for a long time, it can efficiently recover electric power.

  Moreover, a 1st heat-transfer member and a 2nd heat-transfer member can be shape | molded integrally. Thereby, it can be set as the structure simplified more, a heat transfer loss can be made small, and the heat energy stored in the labyrinth part can be transmitted to the thermoelectric conversion means.

  Furthermore, the heat energy stored in the labyrinth part can be directly transferred to the first heat transfer member via the thermally conductive grease in addition to the heat transfer by radiant heat. Thereby, since the 1st heat transfer member is heated more efficiently, heat energy can be transferred to the heating side of the thermoelectric conversion means via the 2nd heat transfer member.

It is a schematic structure figure showing roughly the composition of the brake device for vehicles concerning a 1st embodiment of the present invention. It is the schematic for demonstrating arrangement | positioning of the heat recovery part of FIG. 1, and a power converter. It is an enlarged view for demonstrating the heat recovery part and power conversion part of FIG. It is a schematic block diagram which shows roughly the structure of the vehicle braking device which concerns on 2nd Embodiment of this invention. It is the schematic for demonstrating arrangement | positioning of the heat recovery part and power conversion part of FIG. It is an enlarged view for demonstrating the heat recovery part and power conversion part of FIG.

a. First Embodiment Hereinafter, a vehicle braking apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a system configuration of a vehicle braking device S according to the first embodiment. In addition to braking the vehicle, the vehicle braking device S collects kinetic energy as thermal energy along with braking, and further converts the collected thermal energy into electrical energy for storage.

  For this reason, as shown in FIG. 1, the vehicle braking device S includes a braking unit 10 that applies a braking force to the wheels W, and a heat recovery unit that recovers thermal energy generated by braking by the braking unit 10. Unit 20 and a power recovery unit 30 that converts the thermal energy recovered by the heat recovery unit 20 into electrical energy and stores the electric energy. 1 shows a case where the vehicle braking device S is provided on one wheel, for example, the vehicle braking device S is provided on the left and right front wheels of the vehicle, or the left and right rear wheels of the vehicle and all the wheels. Needless to say, the present invention can be implemented by providing a vehicle braking device S.

  The braking unit 10 serving as a braking force applying unit is a drum brake unit including a brake drum 11 and a brake shoe 12. The brake drum 11 is assembled to a hub H rotatably supported by a hub bearing B assembled to a knuckle N constituting a suspension device (not shown), and rotates integrally with a wheel W. is there. Further, as shown in FIG. 1, an annular groove is formed on the opening end surface of the brake drum 11, and this groove forms a labyrinth portion 11a.

  As shown in FIGS. 1 and 2, the brake shoe 12 is accommodated in the brake drum 11 and assembled to a backing plate 13 that is fixed to the vehicle body so as not to rotate. The brake shoe 12 is configured to frictionally engage the lining with the friction sliding surface 11 b of the brake drum 11 by the operation of the wheel cylinder WS fixed to the backing plate 13. The detailed structure and operation of the drum brake unit are the same as those of the well-known drum brake unit, and are not directly related to the present invention, so the description thereof is omitted.

  In the braking unit 10 configured as described above, when a brake pedal (not shown) is operated by the driver, the brake fluid pressure is supplied to the wheel cylinder WS. Thus, the brake shoe 12 causes the lining to be pressed against the friction sliding surface 11b of the brake drum 11 and frictionally engaged with the increase of the supplied brake hydraulic pressure. A frictional force is generated by frictionally engaging the lining with the brake drum 11 that rotates integrally with the wheel W, and this frictional force is applied as a braking force that brakes the rotation of the wheel W.

  Further, as a braking force, that is, a frictional force is applied to the rotation of the wheel W, frictional heat (thermal energy) is generated on the frictional sliding surface 11b and the lining. Therefore, the braking unit 10 brakes the rotating wheel W by converting the kinetic energy into heat energy (friction heat) by friction accompanying braking of the vehicle.

  As shown in FIGS. 1 to 3, the heat recovery unit 20 as a heat transfer means includes a first heat transfer element 21 (for example, a copper heat pipe) as a first heat transfer member and a second heat transfer member. The second heat transfer element 22 (for example, a copper heat pipe) is formed. As shown in detail in FIGS. 2 and 3, the first heat transfer element 21 is formed in a circumferential shape in the rotation direction of the brake drum 11, and is formed in an annular groove in the labyrinth portion 11 a formed in the brake drum 11. Contained. Here, the 1st heat-transfer element 21 is accommodated in the state which adjoined, without contacting the brake drum 11 which rotates integrally with the wheel W within the cyclic | annular groove | channel in the labyrinth part 11a. One end side of the second heat transfer element 22 is thermally connected to the first heat transfer element 21, and the other end side is connected to a thermoelectric conversion unit 31 of the power conversion unit 30 described later.

  As a result, in the heat recovery unit 20, when frictional heat (heat energy) is generated by friction between the friction sliding surface 11 b of the brake drum 11 and the lining, the first heat transfer element 21 causes the friction sliding surface of the brake drum 11. Friction heat (heat energy) transferred to the entire circumference of the labyrinth portion 11a formed so as to be adjacent to 11b is recovered as radiant heat. The frictional heat (heat energy) recovered by the first heat transfer element 21 is transferred to the thermoelectric conversion unit 31 of the power recovery unit 30 via the thermally connected second heat transfer element 22. ing.

  As schematically shown in FIGS. 1 to 3, the power recovery unit 30 includes a plurality of (four in the present embodiment) thermoelectric conversion units 31 that are assembled to the backing plate 13. . The thermoelectric conversion unit 31 converts the applied thermal energy into electrical energy by using a known Seebeck effect possessed by a substance (specifically, a semiconductor). As shown in FIG. 3, the thermoelectric conversion unit 31 has a heating side, that is, a heating surface 31 a that is in contact with the other end side of the second heat transfer element 22 of the heat recovery unit 20, and a cooling side, that is, the cooling surface 31 b, that is a backing plate 13. To come into contact.

  Here, the conversion from thermal energy to electrical energy by the thermoelectric converter 31 will be described. In the thermoelectric conversion section 31, as shown in FIG. 3, the frictional heat transferred from the friction surface 11b of the brake drum 11 through the first heat transfer element 21 and the second heat transfer element 22 in the heating surface 31a. Heated by (thermal energy), the cooling surface 31b is cooled by, for example, the backing plate 13 in contact with the traveling wind. Thereby, the thermoelectric conversion part 31 generate | occur | produces the electromotive force (henceforth this electromotive force is called regenerative electric power) according to the temperature difference of the heating surface 31a and the cooling surface 31b by the known Seebeck effect. That is, the thermoelectric conversion unit 31 can convert the frictional heat (heat energy) recovered by the heat recovery unit 20 into electric energy (regenerative power).

  Moreover, the electric power collection | recovery part 30 is provided with the transformation circuit 32 and the battery 33 as an electrical storage means as shown in FIG. 1 and FIG. The transformer circuit 32 is an electric circuit that electrically connects the thermoelectric conversion unit 31 and the battery 33 with, for example, a DC-DC converter, a capacitor, and the like as main components. The transformer circuit 32 transforms the regenerative power generated by the thermoelectric converter 31 and outputs the transformed power to the battery 33. The battery 33 stores the regenerative power output from the transformer circuit 32.

  Next, the operation of the vehicle braking device S configured as described above will be described. When a brake pedal (not shown) is operated by the driver, the braking unit 10 applies a braking force to the rotation of the wheel W. That is, in the brake unit 10, as described above, the brake fluid pressure corresponding to the operation of the brake pedal is supplied to the wheel cylinder WS. Then, the wheel cylinder WS presses the lining of the brake shoe 12 onto the friction sliding surface 11b of the brake drum 11 that rotates integrally with the wheel W by the supplied brake hydraulic pressure. Thereby, a frictional force is generated between the frictional sliding surface 11b of the brake drum 11 and the lining, and this frictional force is applied to the rotating wheel W as a braking force.

  On the other hand, the frictional heat (heat energy) generated on the frictional sliding surface 11b of the brake drum 11 in association with the braking by the frictional force is transferred to the labyrinth portion 11a formed adjacently to form an annular shape forming the labyrinth portion 11a. Heat is stored in the groove. The accumulated frictional heat (thermal energy) is recovered by the heat recovery unit 20 and converted into regenerative power (electric energy) by the power recovery unit 30. Hereinafter, the recovery of frictional heat (thermal energy) and the generation of regenerative power (electric energy) will be specifically described.

  First, in detail from the recovery (heat transfer) of frictional heat (thermal energy), the first heat transfer element 21 of the heat recovery unit 20 is accommodated in an annular groove forming the labyrinth portion 11a. For this reason, the first heat transfer element 21 thermally transports frictional heat (thermal energy) from the labyrinth part 11a in which frictional heat (thermal energy) is stored toward the second heat transfer element 22, that is, the low temperature part. . Then, the second heat transfer element 22 heat-transports the heat transported frictional heat (thermal energy) from the first heat transfer element 21, that is, the high temperature part, to the thermoelectric conversion part 31, that is, the low temperature part of the power recovery unit 30. Therefore, the heat recovery unit 20 can recover (heat transfer) the frictional heat (heat energy) stored in the labyrinth unit 11a.

  On the other hand, in the thermoelectric conversion part 31, the 2nd heat transfer element 22 is connected with respect to the heating surface 31a. For this reason, the frictional heat (heat energy) transferred from the labyrinth part 11 a via the first heat transfer element 21 and the second heat transfer element 22 heats the heating surface 31 a of the thermoelectric conversion part 31. That is, the thermoelectric converter 31 can use frictional heat (heat energy) generated by braking on the frictional sliding surface 11 b of the brake drum 11.

  Next, the generation of regenerative power by the thermoelectric converter 31 will be described in detail. As described above, the heating surface 31a of the thermoelectric converter 31 is heated by the frictional heat (heat energy) transferred (recovered) through the second heat transfer element 22. On the other hand, the cooling surface 31b of the thermoelectric conversion unit 31 is in contact with the backing plate 13 as shown in FIG. 3. For example, the backing plate 13 can be quickly exchanged by exchanging heat with the traveling wind of the vehicle. As a result, the cooling surface 31b of the thermoelectric converter 31 is cooled.

  Thereby, in the thermoelectric conversion part 31, the heating surface 31a is transmitted from the friction sliding surface 11b of the brake drum 11 (more specifically, the labyrinth part 11a) through the first heat transfer element 21 and the second heat transfer element 22. Heated by the heated frictional heat (heat energy), the cooling surface 31 b is cooled by the backing plate 13. Therefore, the thermoelectric conversion unit 31 can efficiently convert heat energy into electric energy and generate regenerative power by the well-known Seebeck effect according to the temperature difference between the heating surface 31a and the cooling surface 31b. . The generated regenerative power is transformed by the transformer circuit 32 and stored in the battery 33. Thus, since the regenerative electric power stored in the battery 33 can be used by other devices mounted on the vehicle, for example, it is possible to reduce engine load and improve fuel efficiency.

  As can be understood from the above description, according to the first embodiment, in the drum brake unit, the first heat transfer element 21 is provided in the labyrinth portion 11 a formed between the brake drum 11 and the backing plate 13. At the same time, the second heat transfer element 22 can transfer the frictional heat (heat energy) transferred from the first heat transfer element 21 to the heating surface 31 a of the thermoelectric converter 31. That is, the first heat transfer element 21 and the second heat transfer element 22 are labyrinths in which frictional heat (heat energy) generated by braking adjacent to the frictional sliding surface 11b of the brake drum 11 is reliably and quickly stored. The frictional heat (thermal energy) can be efficiently recovered from the part 11 a and can be transferred to the heating surface 31 a of the thermoelectric conversion part 31.

  And the thermoelectric conversion part 31 assembled | attached to the backing plate 13 heats the heating surface 31a with the frictional heat (thermal energy) transferred from the labyrinth part 11a via the 1st heat transfer element 21 and the 2nd heat transfer element 22. Then, the cooling surface 31 b is cooled via the backing plate 13. Therefore, since a temperature difference can be appropriately generated between the heating surface 31a and the cooling surface 31b of the thermoelectric conversion unit 31, for example, regenerative power (electric energy) can be generated by the well-known Seebeck effect.

  Here, since the drum brake unit has a structure in which the opening side (vehicle body side) of the brake drum 11 is closed by the backing plate 13, frictional heat (heat energy) generated by braking is generated inside the brake drum 11, particularly in the interior. The labyrinth portion 11a is easy to beat. Accordingly, the heating surface 31a of the thermoelectric conversion unit 31 is heated for a relatively long time by the first heat transfer element 21 and the second heat transfer element 22 and maintained at a high temperature state, while the backing plate 13 is driven by traveling wind or the like. Is cooled, and the cooling surface 31b of the thermoelectric converter 31 is always cooled. For this reason, since the thermoelectric conversion part 31 can convert friction heat (thermal energy) into regenerative electric power (electric energy) continuously over a long time, it can collect | recover electric power efficiently.

  Further, the first heat transfer element 21 can be provided in the labyrinth part 11 a of the brake drum 11, and the thermoelectric conversion part 31 can be assembled to the backing plate 13. Thereby, it is not necessary to change the brake drum and brake shoe in a normal drum brake unit. Therefore, the heat recovery unit 20 and the power recovery unit 30 can be assembled to a normal drum brake unit, and for example, the manufacturing cost can be reduced.

b. Second Embodiment In the first embodiment, the heat recovery unit 20 serving as a heat transfer means includes a first heat transfer element 21 serving as a first heat transfer member and a second heat transfer element 22 serving as a second heat transfer member. The first heat transfer element 21 and the second heat transfer element 22 were thermally connected. In this case, the first heat transfer member and the second heat transfer member can be integrally formed. Hereinafter, although this 2nd Embodiment is described in detail, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the description is abbreviate | omitted.

  Also in the second embodiment, as shown in FIG. 4, the braking unit 10 is a drum brake unit including a brake drum 11 and a brake shoe 12. The second embodiment is also the same as the first embodiment in that the power recovery unit 30 includes a thermoelectric conversion unit 31, a transformer circuit 32, and a battery 33. However, the second embodiment is different in that a heat recovery unit 40 is provided instead of the heat recovery unit 20 in the first embodiment.

  As shown in FIGS. 4 to 6, in the heat recovery unit 40 in the second embodiment, the first heat transfer member 41 and the second heat transfer member are integrally formed. The first heat transfer member 41 and the second heat transfer member 42 are formed of, for example, a copper plate having excellent heat transfer characteristics. As shown in detail in FIGS. 5 and 6, the first heat transfer member 41 is formed in an annular shape, and is accommodated in an annular groove in the labyrinth portion 11 a formed in the brake drum 11. The second heat transfer member 42 protrudes from the first heat transfer member 41 in a band shape and is connected to the thermoelectric conversion unit 31 of the power conversion unit 30.

  Here, as shown in an enlarged view in FIG. 6, the first heat transfer member 41 rotates integrally with the wheel W through the grease 43 having thermal conductivity in the annular groove in the labyrinth portion 11a. The brake drum 11 is housed in a thermally connected state. The labyrinth portion 11a is assembled with a heat-resistant boot 44 for preventing the grease 43 filled in the annular groove from flowing out and supporting the first heat transfer member 41.

  Next, the operation of the vehicle braking device S according to the second embodiment configured as described above will be described. Also in the vehicle braking device S according to the second embodiment, the lining of the brake shoe 12 is applied to the friction sliding surface 11b of the brake drum 11 that rotates integrally with the wheel W in accordance with the operation of the brake pedal by the driver. Friction engagement. Thereby, a frictional force is generated between the frictional sliding surface 11b of the brake drum 11 and the lining, and frictional heat (thermal energy) generated on the frictional sliding surface 11b of the brake drum 11 due to braking by this frictional force. The heat is transferred to the labyrinth portion 11a formed adjacently, and is stored in an annular groove forming the labyrinth portion 11a.

  The stored frictional heat (heat energy) is recovered by the heat recovery unit 40 and converted into regenerative power (electric energy) by the power recovery unit 30. Hereinafter, the recovery of frictional heat (thermal energy) and the generation of regenerative electric power (electric energy) in the second embodiment will be specifically described.

  First, the friction heat (thermal energy) recovery (heat transfer) of the heat recovery unit 40 will be described in detail. The first heat transfer member 41 of the heat recovery unit 40 is accommodated in an annular groove that forms the labyrinth portion 11a. ing. The first heat transfer member 41 is thermally connected to the brake drum 11 via a grease 43 having thermal conductivity. For this reason, the first heat transfer member 41 is heated by radiant heat and directly by heat transfer from the grease 43 in the labyrinth portion 11a in which frictional heat (thermal energy) is stored. The first heat transfer member 41 heated in this way transfers frictional heat (heat energy) toward the second heat transfer element 22. On the other hand, the second heat transfer member 42 transfers the transferred frictional heat (thermal energy) toward the thermoelectric conversion unit 31 of the power recovery unit 30. Therefore, the heat recovery unit 40 can recover (heat transfer) the frictional heat (heat energy) stored in the labyrinth unit 11a more efficiently.

  And in the thermoelectric conversion part 31, the 2nd heat-transfer member 42 is connected with respect to the heating surface 31a. For this reason, the frictional heat (heat energy) transferred from the labyrinth part 11 a via the first heat transfer member 41 and the second heat transfer member 42 heats the heating surface 31 a of the thermoelectric conversion part 31. That is, the thermoelectric conversion unit 31 can use frictional heat (heat energy) generated by braking on the frictional sliding surface 11b of the brake drum 11 as in the first embodiment.

  Thereby, in the thermoelectric conversion part 31, the heating surface 31a is the 1st heat-transfer member 41 and 2nd from the friction sliding surface 11b (more specifically, labyrinth part 11a) of the brake drum 11 similarly to the said 1st Embodiment. Heated by the frictional heat (heat energy) collected through the heat transfer member 42, the cooling surface 31 b is cooled by the backing plate 13. Therefore, the thermoelectric conversion unit 31 can efficiently convert heat energy into electric energy and generate regenerative power by the well-known Seebeck effect according to the temperature difference between the heating surface 31a and the cooling surface 31b. . Then, the generated regenerative power is transformed by the transformer circuit 32 and stored in the battery 33 as in the first embodiment. Thus, since the regenerative electric power stored in the battery 33 can be used by other devices mounted on the vehicle, for example, it is possible to reduce engine load and improve fuel efficiency.

  As can be understood from the above description, according to the second embodiment, the first heat transfer member 41 and the second heat transfer member 42 can be integrally formed. As a result, the structure can be simplified and heat transfer loss can be reduced, and the frictional heat (heat energy) stored in the labyrinth part 11a can be transferred to the thermoelectric conversion part 31. .

  Further, the first heat transfer member 41 is directly heated in the annular groove of the labyrinth portion 11a via the heat-conductive grease 43 in addition to the heat by radiant heat. Thereby, since the 1st heat-transfer member 41 is heated more efficiently, friction heat (heat energy) can be transferred to the heating surface 31a of the thermoelectric conversion part 31 via the 2nd heat-transfer member 42. .

  Other effects are the same as in the first embodiment.

  In carrying out the present invention, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the object of the present invention.

  For example, in the said 1st Embodiment, it arrange | positioned and implemented so that the 1st heat-transfer element 21 might not contact with the cyclic | annular groove | channel of the labyrinth part 11a. In this case, for example, similarly to the second embodiment, the brake drum 11 and the first heat transfer element 21 may be thermally connected via a thermally conductive grease. As a result, the first heat transfer element 21 is directly heated in the annular groove of the labyrinth portion 11a through the thermally conductive grease in addition to the heating by radiant heat. Thereby, since the 1st heat transfer element 21 is heated more efficiently, friction heat (heat energy can be transferred to the heating surface 31a of the thermoelectric conversion part 31 via the 2nd heat transfer element 22.

  Moreover, in each said embodiment, it implemented so that the cooling surface 31b of the thermoelectric conversion part 31 might be cooled by air-cooling the backing plate 13 with driving | running | working wind. However, the cooling of the backing plate 13, that is, the cooling of the cooling surface 31 b of the thermoelectric conversion unit 31 is not limited to this. For example, any method such as a water cooling method may be adopted.

DESCRIPTION OF SYMBOLS 10 ... Brake part, 11 ... Brake drum, 11a ... Labyrinth part, 11b ... Friction sliding surface, 12 ... Brake shoe, 20 ... Heat recovery part, 21 ... 1st heat transfer element, 22 ... 2nd heat transfer element, 30 DESCRIPTION OF SYMBOLS ... Power recovery part, 31 ... Thermoelectric conversion part, 31a ... Heating surface, 31b ... Cooling surface, 32 ... Transformer circuit, 33 ... Battery, 40 ... Heat recovery part, 41 ... First heat transfer member, 42 ... Second heat transfer Member, 43 ... Grease, 44 ... Heat-resistant boot, S ... Vehicle braking device, W ... Wheel, H ... Hub, B ... Hub nut, N ... Knuckle, WS ... Wheel cylinder

Claims (8)

In a vehicle braking device that applies a braking force to the rotation of a wheel and collects thermal energy generated in association with the application of the braking force
A braking force caused by friction with respect to the rotation of the wheel by friction engagement between a brake drum that rotates integrally with the wheel and a brake shoe that is assembled to a backing plate that is provided so as not to rotate with respect to the rotation of the wheel. Braking force applying means for applying
Thermoelectric conversion means that is assembled to the backing plate and converts thermal energy generated by the friction into electrical energy;
And a heat transfer means for transferring heat energy generated by the friction stored in a labyrinth portion formed between the opening side end face of the brake drum and the backing plate to the thermoelectric conversion means. Vehicle braking device. The vehicle braking device according to claim 1,
The heat transfer means,
A vehicular braking device, wherein the brake drum is arranged in a circumferential direction in which the brake drum rotates. In the vehicle braking device according to claim 1 or 2,
The heat transfer means,
A first heat transfer member that is provided in the labyrinth portion and transfers heat energy generated by the friction;
A vehicular braking apparatus, comprising: a second heat transfer member that transfers heat energy transferred by the first heat transfer member toward the thermoelectric conversion means. The vehicle braking device according to claim 3,
The first heat transfer member and the second heat transfer member are respectively
A braking device for a vehicle, which is a heat transfer element that thermally transports thermal energy from a high temperature portion toward a low temperature portion. The vehicle braking device according to claim 3,
The vehicular braking apparatus, wherein the first heat transfer member and the second heat transfer member are integrally formed. The vehicle braking device according to claim 3,
The vehicular braking apparatus, wherein heat energy stored in the labyrinth portion is transferred to the first heat transfer member by grease having thermal conductivity. The vehicle braking device according to claim 1,
The thermoelectric conversion means includes
One side is heated by the heat energy transferred from the labyrinth part via the heat transfer means, and the other side is cooled via the backing plate, resulting in a temperature difference between the one side and the other side. A vehicular braking device that converts thermal energy into electrical energy accordingly. The vehicle braking device according to claim 1, further comprising:
A braking device for a vehicle, comprising: a power storage unit that stores electrical energy converted from thermal energy by the thermoelectric conversion unit as electric power.

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