JP2011133068A - Braking device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking device for a vehicle, which suitably brakes a vehicle, effectively recoveres thermal energy generated along with braking, and effectively uses electric energy converted from the thermal energy. <P>SOLUTION: A braking part 10 includes a brake drum 11 having a sliding member 11a mounted on an inner peripheral surface in a state of not being relatively displaceable, and a brake shoe 12 having a lining frictionally engaging with the sliding member. A heat recovery part 20 includes a thermoelectric conversion part 21 held between the inner peripheral surface of the brake drum and the sliding member. The heat recovery part further includes a collector brush 22a sliding with a slip ring 23a electrically connected to one surface side 21a of the thermoelectric conversion part, and a collector brush 22b sliding with a slip ring 23b electrically connected to the other surface side 21b of the thermoelectric conversion part. Thus, the brush can collect the electric energy converted by the thermoelectric conversion part. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 researched 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, frictional heat generated in the brake caliper brake pad due to 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. Therefore, the thermoelectric conversion element can generate electric power due to a 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.

JP-A-11-220804

  By the way, as a vehicle braking device, a drum brake unit including a brake drum and a brake shoe in addition to a disc brake unit including a brake disc and a brake caliper, as in the conventional device described in Patent Document 1 above. Exists and is widely adopted. When such a drum brake unit is employed to recover the thermal energy generated by braking and convert it into electrical energy, the brake drum and brake are used from the viewpoint of the recovery efficiency of frictional heat and the conversion efficiency to electricity. It is desirable to place the thermoelectric conversion element as close as possible to the vicinity of the sliding portion where the shoe generates frictional heat.

  However, in general, a drum brake unit has a structure in which a brake shoe is housed in a brake drum that rotates integrally with a wheel, is fixed to a vehicle body side, and the brake shoe is crimped to an inner peripheral surface of the brake drum. Adopted. For this reason, for example, when a thermoelectric conversion element is assembled to the brake shoe, heat is generated in the brake drum, which may cause a large temperature difference between the heating surface side and the cooling surface side of the thermoelectric conversion element. It becomes difficult. On the other hand, it is assumed that a thermoelectric conversion element is assembled on the brake drum side that can generate heat by friction with the brake shoe and can be cooled by running wind, etc., but the brake shoe is pressure-bonded to the inner peripheral surface of the brake drum. Therefore, it is necessary to protect the thermoelectric conversion element having inferior mechanical strength from the shearing force generated when the brake shoe is pressed. Further, since the brake drum rotates integrally with the wheel, there is room for examination in terms of collecting the converted electric power.

  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 feature of the present invention is that a braking force is applied to the rotation of the wheel, and the vehicle braking device recovers thermal energy generated by the application of the braking force. A metal sliding member that frictionally engages with a friction member of a brake shoe assembled so as not to rotate with respect to rotation is provided so as not to be relatively displaceable with respect to the inner peripheral surface of the brake drum that rotates integrally with the wheel. A braking force applying means for applying a braking force by friction with respect to the rotation of the wheel; and disposed between an inner peripheral surface of the brake drum and the sliding member, and recovering thermal energy generated by the friction. And thermoelectric conversion means for converting into electric energy. In this case, it is preferable to further include power storage means for storing the electrical energy converted by the thermoelectric conversion means.

  Further, in this case, it is preferable to include a current collecting means that collects the electric energy converted by the thermoelectric conversion means that is provided so as not to rotate with respect to the rotation of the wheel and rotates integrally with the brake drum.

  In this case, the current collecting means, for example, slides between the sliding member electrically connected to one surface side of the thermoelectric converting means and collects current, and other than the thermoelectric converting means. The inner surface of the brake drum that is electrically connected to one surface side of the thermoelectric conversion means by sliding between the surface side and the inner surface of the brake drum electrically connected to the surface side A slip ring that slides and collects electricity with an integrally rotating slip ring and is electrically connected to the other surface side of the thermoelectric conversion means and rotates integrally with an inner peripheral surface of the brake drum It is good to slide between and collect current. Further, in this case, the current collecting means includes, for example, a wheel cylinder provided for frictionally engaging the friction member of the brake shoe with the sliding member of the brake drum, or a hub that supports the brake drum. It is good to provide in the inside of the seal mechanism provided in the hub bearing supported rotatably.

  According to these, the sliding member that frictionally engages with the friction member (lining) of the brake shoe can be provided on the inner peripheral surface of the brake drum so as not to displace relative to the inner peripheral surface of the brake drum. The thermoelectric conversion means can be sandwiched between the member and the inner peripheral surface of the brake drum. Accordingly, the thermoelectric conversion means can be assembled in contact with (in close contact with) the inner peripheral surface of the brake drum, and even when the friction member of the brake shoe is frictionally engaged with the sliding member during braking, the thermoelectric conversion means can be used. Since the conversion means is protected by the sliding member, for example, it is possible to prevent the thermoelectric conversion means from being damaged by a shearing force accompanying frictional engagement.

  Further, when braking, when frictional heat (thermal energy) is generated by frictional engagement between the sliding member and the friction member, one surface side of the thermoelectric conversion means that contacts (adheres) to the sliding member is heated and the brake drum The other surface side of the thermoelectric conversion means that is in close contact with the inner peripheral surface is cooled. Therefore, since a temperature difference can be appropriately generated between one surface side (heating side) and the other surface side (cooling side) of the thermoelectric conversion means, for example, heat energy generated by the well-known Seebeck effect is converted into electric energy. Can be converted efficiently. In addition, since the current collecting means that does not rotate integrally with the brake drum can recover the electric energy converted by sliding, the electric energy can be reliably recovered with an extremely simple structure.

  Here, in a so-called drum brake unit including a brake drum and a brake shoe, frictional heat (heat energy) generated by braking is likely to enter the inside of the brake drum. Therefore, one surface side (heating side) of the thermoelectric conversion means is maintained at a high temperature for a relatively long time, while the other surface side (cooling side) of the thermoelectric conversion means is always cooled by traveling wind or the like. For this reason, since the thermoelectric conversion means can continuously convert frictional heat (thermal energy) into regenerative power (electric energy) for a long time, it can efficiently recover power.

1 is a schematic configuration diagram schematically illustrating a configuration of a vehicle braking device according to an embodiment of the present invention. It is the schematic which shows in detail the assembly | attachment state of the sliding member and thermoelectric conversion part of FIG. It is a figure for demonstrating the heat recovery part of FIG. It is the schematic which shows in detail the structure of the heat recovery part (current collection brush) which concerns on the modification of this invention. It is a figure for demonstrating the heat recovery part of FIG. It is a figure for demonstrating the heat recovery part which concerns on the modification of this invention. It is a figure for demonstrating the heat recovery part provided in the hub bearing according to the modification of this invention. (A), (b) is a figure for demonstrating the assembly | attachment of a sliding member and a thermoelectric conversion part according to the modification of this invention. It is a figure for demonstrating the modification of the assembly | attachment of the sliding member and thermoelectric conversion part of FIG.

  Hereinafter, a vehicle braking device 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 present embodiment. In addition to braking the vehicle, the vehicle braking device S collects kinetic energy generated as a result of braking as thermal energy, and further converts the collected thermal energy into electrical energy for storage. is there.

  For this reason, as shown in FIG. 1, the vehicle braking device S collects a braking unit 10 that applies a braking force to the wheels W, and collects and recovers thermal energy generated by braking by the braking unit 10. And a heat recovery unit 20 for converting the stored thermal energy into electrical energy and storing the 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. As shown in FIGS. 1 and 2, the brake shoe 12 is accommodated in the brake drum 11 and assembled to a back plate BP that is fixed to the vehicle body so as not to rotate. The brake shoe 12 is engaged with the metal sliding member 11a by which the lining 12a as a friction member is fixed to the inner peripheral surface of the brake drum 11 as will be described in detail later by the operation of the wheel cylinder WS. It comes to match. 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. Thereby, the brake shoe 12 presses the lining 12a against the sliding member 11a fixed to the brake drum 11 and frictionally engages the brake shoe 12 with the increase of the supplied brake hydraulic pressure. A frictional force is generated by frictionally engaging the lining 12a with the brake drum 11 (more specifically, the sliding member 11a) that rotates integrally with the wheel W, and this frictional force causes the wheel W to rotate. It is given as a braking force for braking.

  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 in the sliding member 11a and the lining 12a. 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 schematically shown in FIGS. 1 and 2, the heat recovery unit 20 includes a thermoelectric conversion unit 21 as thermoelectric conversion means sandwiched between the inner peripheral surface of the brake drum 11 and the sliding member 11 a. The thermoelectric conversion unit 21 converts the applied thermal energy into electrical energy using a known Seebeck effect possessed by a substance (specifically, a semiconductor). As shown in FIG. 2, the thermoelectric conversion portion 21 has one surface side 21 a in contact with the sliding member 11 a that is a heat generating portion of the braking portion 10, and the other surface side 21 b in contact with the inner peripheral surface of the brake drum 11. Are sandwiched and assembled in a substantially cylindrical shape.

  Here, the assembly of the thermoelectric conversion unit 21 will be described. First, a sheet-like thermoelectric conversion portion 21 formed so as to be shorter than the inner peripheral length of the brake drum 11 by the width of the key groove formed on the inner peripheral surface of the brake drum 11 is based on the key groove. And temporarily assembled to the inner peripheral surface of the brake drum 11. Next, the cylinder formed so as to have an outer peripheral length slightly longer than the inner peripheral length of the brake drum 11 at room temperature with respect to the inner peripheral surface of the brake drum 11 to which the thermoelectric conversion portion 21 is temporarily assembled in this way. The sliding member 11a having a shape is assembled. At this time, for example, the sliding member 11a is cooled to a very low temperature, and is assembled without contacting the inner surface of the brake drum 11 in a state where the outer peripheral length is slightly shorter than that at normal temperature. Finally, the key having the insulating material formed on the surface thereof is fitted into the key groove formed on the inner peripheral surface of the brake drum 11 and the outer peripheral surface of the sliding member 11a. In this embodiment, one keyway and one key are provided, but a plurality of keyways and keys may be provided.

  As a result, when the temperature of the sliding member 11a returns to room temperature, the sliding member 11a expands, thereby pressing the thermoelectric conversion portion 21 against the inner peripheral surface of the brake drum 11 and holding the thermoelectric conversion portion 21 therebetween. be able to. Further, by fitting the key in the key groove, the sliding member 11a and the brake drum 11 can be electrically insulated, and the sliding member 11a is in contact with the inner peripheral surface of the brake drum 11. It is possible to prevent relative displacement in the circumferential direction.

  Thus, as described above, even when a frictional force is generated between the lining 12a of the brake shoe 12 and the sliding member 11a due to braking, the sliding member 11a is applied to the inner peripheral surface of the brake drum 11. There is no relative displacement. Accordingly, an appropriate frictional force, that is, a braking force can be generated by frictional engagement between the sliding member 11a and the lining 12a, and shearing force accompanying frictional engagement is prevented from acting on the thermoelectric conversion portion 21. can do. Furthermore, since the inner peripheral surface of the sliding member 11a is continuous in the circumferential direction, for example, vibrations and the like are prevented from occurring during friction engagement with the lining 12a, that is, during braking. be able to. Although illustration is omitted, when the thermoelectric converter 21 is assembled to the brake drum 11, for example, in order to prevent corrosion due to water or the like, a sealing material is applied around the thermoelectric converter 21 to ensure waterproofness. It is supposed to be.

  Further, when the sliding member 11a is assembled without contacting the inner surface of the brake drum 11, frictional heat (thermal energy) generated by frictional engagement between the lining 12a of the brake shoe 12 and the sliding member 11a is slid. Heat transfer from the moving member 11a to the inner surface of the brake drum 11 can be prevented. Thereby, most of the generated frictional heat (thermal energy) can be transferred to the one surface side 21a (heating side) of the thermoelectric converter 21.

  Thus, by assembling the thermoelectric conversion part 21, as will be described later, the thermoelectric conversion part 21 is known to generate an electromotive force (in accordance with the temperature difference between the one side 21a and the other side 21b due to the Seebeck effect). Electric energy) can be generated. In the following description, the electromotive force generated by the thermoelectric converter 21 is referred to as regenerative power (electric energy).

  Further, as shown in FIG. 2, the heat recovery unit 20 includes current collecting brushes 22 a and 22 b for collecting the regenerative power generated by the thermoelectric conversion unit 21. The current collecting brushes 22a and 22b are each assembled to a wheel cylinder WS whose position from the road surface becomes higher when the vehicle is mounted, and the current collecting brush 22a is an inner surface of the brake drum 11 as specifically shown in FIG. The current collector brush 22b slides on the conductive slip ring 23b assembled on the inner surface of the brake drum 11 and slides on the conductive slip ring 23a assembled on the inner surface of the brake drum 11. Yes. Here, as shown in FIG. 3, the slip ring 23 a having conductivity is electrically connected to one surface side 21 a (heating side) of the thermoelectric converter 21. Moreover, the slip ring 23b which has electroconductivity is electrically connected with the other surface side 21b (cooling side) of the thermoelectric conversion part 21, as shown in FIG.

  Furthermore, the heat recovery unit 20 includes a transformer circuit 24 and a battery 25 as shown in FIG. The transformer circuit 24 is an electric circuit that electrically connects the thermoelectric conversion unit 21 (more specifically, the current collecting brushes 22a and 22b) and the battery 25 using, for example, a DC-DC converter, a capacitor, and the like as main components. is there. Then, the transformer circuit 24 transforms the regenerative power generated by the thermoelectric converter 21 and outputs it to the battery 25. The battery 25 stores the regenerative power output from the transformer circuit 24.

  In the heat recovery part 20 configured in this way, the one surface side 21a of the thermoelectric conversion part 21 is in close contact with the sliding member 11a, so that frictional engagement between the lining 12a of the brake shoe 12 and the sliding member 11a is achieved. It is heated by frictional heat (heat energy) generated by. On the other hand, since the other surface side 21b of the thermoelectric converter 21 is in close contact with the inner peripheral surface of the brake drum 11 exposed to the outside air, for example, the brake drum 11 is cooled by running wind or the like. To be cooled. Thereby, in the situation where braking force is given to wheel W which brake part 10 is rotating, between one side 21a (heating side) and other side 21b (cooling side) of thermoelectric conversion part 21 Since the temperature difference occurs, the thermoelectric conversion unit 21 can generate line power (electric energy) according to the generated temperature difference by a well-known Seebeck effect.

  And the regenerative electric power generated by the thermoelectric converter 21 is collected by the current collecting brushes 22a and 22b via the electrically connected slip rings 23a and 23b. Specifically, since the slip rings 23 a and 23 b are assembled to the brake drum 11, the slip rings 23 a and 23 b rotate together with the thermoelectric converter 21. Moreover, the thermoelectric conversion part 21 and the slip rings 23a and 23b are electrically connected to each other. The current collecting brushes 22a and 22b assembled to the wheel cylinder WS that is fixed to the vehicle body so as not to rotate collects regenerative power while sliding against the rotating slip rings 23a and 23b.

  The regenerative power collected in this way is transformed by the transformer circuit 24 and output to the battery 25. The battery 25 stores the output regenerative power, and the stored regenerative power is used to drive various devices mounted on the vehicle, for example.

  As can be understood from the above description, according to the present embodiment, in the drum brake unit, the sliding member 11a that frictionally engages the lining 12a of the brake shoe 12 on the inner peripheral surface of the brake drum 11 is provided on the brake drum 11. The thermoelectric conversion portion 21 can be sandwiched between the sliding member 11 a and the inner peripheral surface of the brake drum 11. Thereby, during braking, when frictional heat (thermal energy) is generated by frictional engagement between the sliding member 11a and the lining 12a of the brake shoe 12, one surface side 21a of the thermoelectric converter 21 that is in close contact with the sliding member 11a. Is heated and the other surface side 21b of the thermoelectric converter 21 that is in close contact with the inner peripheral surface of the brake drum 11 is cooled. Therefore, since a temperature difference can be appropriately generated between the one surface side 21a (heating side) and the other surface side 21b (cooling side) of the thermoelectric conversion unit 21, for example, heat energy generated by the well-known Seebeck effect Can be efficiently converted into electrical energy. In addition, since the collecting brushes 22a and 22b that do not rotate integrally with the brake drum 11 can recover the regenerative power (electric energy) converted by sliding, the regenerative power (reliable power) is ensured with an extremely simple structure. Electric energy) can be recovered.

  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 back plate BP, the frictional heat (heat energy) generated by braking is applied to the inside of the brake drum 11. Cheap. Accordingly, the one surface side 21a (heating side) of the thermoelectric conversion unit 21 is maintained at a high temperature for a relatively long time, while the other surface side 21b (cooling side) of the thermoelectric conversion unit 21 is always cooled by traveling wind or the like. The For this reason, since the thermoelectric conversion part 21 can convert friction heat (thermal energy) into regenerative electric power (electrical energy) continuously over a long time, it can collect | recover electric power efficiently.

  Further, the thermoelectric converter 21 is assembled in close contact with the inner peripheral surface of the brake drum 11 by a sliding member 11 a that is assembled so as not to be relatively displaceable with respect to the inner peripheral surface of the brake drum 11. Thereby, even when the lining 12a of the brake shoe 12 is frictionally engaged with the sliding member 11a due to braking, the thermoelectric conversion portion 21 is protected by the sliding member 11a. It is possible to prevent the thermoelectric conversion part 21 from being damaged by the shearing force involved.

  In the above embodiment, the current collecting brushes 22 a and 22 b assembled to the wheel cylinder WS rotate integrally with the brake drum 11 and slide with the slip rings 23 a and 23 b electrically connected to the thermoelectric conversion unit 21. In other words, in other words, the generated regenerative power was collected through the slip rings 23a and 23b. In this case, since the brake drum 11 and the sliding member 11a are made of a conductive metal material, the current collecting brushes 22a and 22b can collect regenerative power without providing the slip rings 23a and 23b. is there. That is, in this case, as schematically shown in FIGS. 4 and 5, the current collecting brush 22 a slides in contact with the sliding member 11 a that is in close contact with the one surface side 21 a (heating side) of the thermoelectric converter 21. The current collecting brush 22b is arranged to contact and slide on the inner surface of the brake drum 11 that is in close contact with the other surface side 21b (cooling side) of the thermoelectric converter 21.

  In this manner, the current collecting brushes 22a and 22b are arranged, and the regenerative power generated by the thermoelectric conversion unit 21 is also collected by sliding in contact with the sliding member 11a and the inner surface of the brake drum 11, respectively. Can be electrified. Therefore, even in this case, the same effect as the above embodiment can be obtained.

  Moreover, in the said embodiment, the slip ring 23b electrically connected with the other surface side 21b (cooling side) of the thermoelectric conversion part 21 was provided and implemented. However, as described above, since the brake drum 11 is generally formed of a conductive metal material, the slip ring 23b can be omitted. In this case, as shown in FIG. 6, the current collecting brush 22 a is electrically connected to the one surface side 21 a (heating side) of the thermoelectric converter 21 and is electrically insulated from the inner surface of the brake drum 11, as in the above embodiment. The current collecting brush 22b is arranged so as to slide with the slip ring 23a assembled via the heat sink, and directly contacts the inner surface of the brake drum 11 that is in close contact with the other surface side 21b (cooling side) of the thermoelectric converter 21. Be placed. Therefore, even in this case, the same effect as the above embodiment can be obtained.

  Moreover, in the said embodiment, in order to make it difficult to receive to the influence of the mud and water which scatter when driving | running | working a deep puddle etc., for example, the wheel cylinder from which the height from the road surface becomes high in the current collection brush 22a, 22b It implemented so that it might assemble | attach to WS. In this case, in order to further improve waterproofness, as schematically shown in FIG. 7, the current collecting brushes 22a and 22b and the slip ring 23a, It is also possible to accommodate 23b.

  Specifically, in this case, the current collecting brushes 22a and 22b are disposed between the seal member G and the outer bearing constituting the hub bearing B as shown in FIG. It is assembled on the side (the non-rotating side). Further, in this case, as shown in FIG. 7, the slip rings 23a and 23b are provided with an insulating layer on the inner ring side of the hub bearing B (the side rotating integrally with the hub H) facing the current collecting brushes 22a and 22b. Is assembled through. The slip rings 23a and 23b are electrically connected to the thermoelectric converter 21 assembled on the inner peripheral surface of the brake drum 11 as in the above embodiment. Specifically, as in the above embodiment, the slip ring 23a is electrically connected to the one surface side 21a (heating side) of the thermoelectric conversion unit 21, and the slip ring 23b is connected to the other surface side 21b (cooling) of the thermoelectric conversion unit 21. Side). In this case, instead of providing the current collecting brushes 22a and 22b and the slip rings 23a and 23b inside the seal member G and outside the outer bearing as shown in FIG. 7, for example, the outer bearing and the inner bearing Current collecting brushes 22a and 22b and slip rings 23a and 23b may be provided therebetween.

  As described above, by housing the current collecting brushes 22a and 22b and the slip rings 23a and 23b in the seal structure of the hub bearing B, it is possible to ensure good waterproofness. Thereby, for example, corrosion of the current collecting brushes 22a and 22b and the slip rings 23a and 23b due to mud and water can be satisfactorily prevented, and the regenerative power generated by the thermoelectric converter 21 is efficiently collected over a long period of time. (Recovery). Other effects are the same as in the above embodiment.

  Furthermore, in the said embodiment, the sliding member 11a previously formed cylindrically with respect to the brake drum 11 is assembled | attached (it fitted), and the thermoelectric conversion part 21 is made into the inner peripheral surface of the brake drum 11, and a sliding member. It was made to stick to the outer peripheral surface of 11a. In this case, in order to further improve the assembly property, as schematically shown in FIG. 8 (a), a plate-like (thin film-like) shape is formed on the sliding member 11a formed from plate-like spring steel via an adhesive layer. A temporary assembly member in which the thermoelectric conversion portion 21 is stacked and an adhesive layer is stacked on the thermoelectric conversion portion 21 is formed in advance. Then, as shown in FIG. 8B, the temporary assembly member is bent and assembled to the inner peripheral surface of the brake drum 11 to prevent the temporary assembly member from being relatively displaced in the inner peripheral direction of the brake drum 11. Insert the key. Thereby, the state in which the thermoelectric conversion part 21 is brought into close contact with the inner peripheral surface of the sliding member 11a and the brake drum 11 by the repulsive force of the curved sliding member 11a (spring steel) is realized. Further, by fitting the key, the relative displacement of the sliding member 11a can be prevented, and the thermoelectric conversion portion 21 can also be prevented from being damaged by the shearing force accompanying the frictional engagement.

  Thus, by assembling the sliding member 11a and the thermoelectric conversion portion 21 on the inner peripheral surface of the brake drum 11, for example, a cooling device or the like is not necessary, and a simple assembling device can be used, thereby reducing manufacturing costs. be able to.

  In addition, when employ | adopting such an assembly method, a key may protrude a little with respect to the internal peripheral surface of the sliding member 11a after an assembly | attachment. In this case, it is preferable that the protruding portion of the key is cut by, for example, cutting to make the inner peripheral surface of the sliding member 11a smooth. By smoothing the inner peripheral surface of the sliding member 11a in this way, it is possible to suppress vibration that occurs when frictionally engaging the lining 12a of the brake shoe 12 during braking.

  Further, in this case, after temporarily assembling the temporary assembly member into two parts, for example, as schematically shown in FIG. 9, these temporary assembly members are bent and assembled to the inner peripheral surface of the brake drum 11. It is also possible to assemble the sliding member 11a and the thermoelectric converter 21 on the inner peripheral surface of the brake drum 11 by fitting two keys. Even in this case, a simple assembling apparatus can be used, and the manufacturing cost can be reduced.

  Further, when the sliding member 11a is formed of a metal other than spring steel, for example, as shown in FIGS. 8B and 9, the key to be fitted causes the sliding member 11a to move in the inner circumferential direction of the brake drum 11. It is possible to generate an expanding force. In this case, a state in which the thermoelectric conversion portion 21 is in close contact with the sliding member 11a and the inner peripheral surface of the brake drum 11 is realized by the expanding force by the key.

  The implementation of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the said embodiment, it implemented so that the thermoelectric conversion part 21 might be arrange | positioned over the perimeter of the internal peripheral surface of the brake drum 11. FIG. In this case, since the sliding member 11a is formed of a metal material having excellent heat conductivity, for example, a plurality of thermoelectric conversion portions 21 are arranged with an interval with respect to the inner peripheral surface of the brake drum 11. Is also possible. Even in this case, the same effects as those of the above-described embodiment and each modification can be expected.

  Moreover, in the said embodiment, the current collection brush 22a, 22b was assembled | attached to the wheel cylinder WS, and it implemented. However, as long as waterproofness can be secured, the current collecting brushes 22a and 22b are not limited to being assembled to the wheel cylinder WS, and the current collecting brushes 22a and 22b may be provided at any position within the brake drum 11. Good.

DESCRIPTION OF SYMBOLS 10 ... Brake part, 11 ... Brake drum, 11a ... Sliding member, 12 ... Brake shoe, 12a ... Lining, 20 ... Heat recovery part, 21 ... Thermoelectric conversion part, 21a ... One side (heating side), 21b ... Other side Side (cooling side), 22a, 22b ... current collecting brush, 23a, 23b ... slip ring, 24 ... transformer circuit, 25 ... battery, S ... vehicle braking device, W ... wheel, H ... hub, B ... hub nut, N …knuckle

Claims (6)

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 metal sliding member that frictionally engages with a friction member of a brake shoe assembled so as not to rotate with respect to the rotation of the wheel cannot be displaced relative to an inner peripheral surface of a brake drum that rotates integrally with the wheel. A braking force applying means for applying a braking force by friction to the rotation of the wheel;
A vehicle comprising: thermoelectric conversion means that is disposed between an inner peripheral surface of the brake drum and the sliding member and recovers thermal energy generated by the friction and converts it into electric energy. Braking device. The vehicle braking device according to claim 1,
The vehicle is characterized by comprising current collecting means for collecting electric energy converted by the thermoelectric conversion means that is provided so as not to rotate with respect to the rotation of the wheel and rotates integrally with the brake drum. Braking device. The vehicle braking device according to claim 2,
The current collecting means includes
The brake drum electrically connected to the other surface side of the thermoelectric conversion means while sliding and collecting electricity between the one surface side of the thermoelectric conversion means and the sliding member electrically connected A braking device for a vehicle, wherein the current is collected by sliding between the inner surface and the inner surface. The vehicle braking device according to claim 2,
The current collecting means includes
It is electrically connected to one side of the thermoelectric conversion means and slidably collects between an inner peripheral surface of the brake drum and a slip ring that rotates integrally with the other side of the thermoelectric conversion means. A vehicle braking device characterized in that current is collected by sliding between a slip ring that is electrically connected to a slip ring that rotates integrally with an inner peripheral surface of the brake drum. The vehicle braking device according to claim 2,
The current collecting means;
A seal mechanism provided on a wheel cylinder provided to frictionally engage a friction member of the brake shoe with a sliding member of the brake drum, or a hub bearing rotatably supporting a hub supporting the brake drum A braking device for a vehicle, which is provided inside. The vehicle braking device according to claim 1, further comprising:
A vehicular braking apparatus comprising: a power storage unit configured to store electrical energy converted by the thermoelectric conversion unit.

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