JP2005104222A - Wheel device with built-in motor with brake, and motor with brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel device with a built-in motor with a brake with high space efficiency. <P>SOLUTION: A friction brake where a drive source is disposed in a rim of the wheel is built in the wheel device with built-in motor of an outer rotor type. The motor is preferably a switch reluctance motor having a structure where a stator and rotor have not a yoke for interconnecting their poles in the peripheral direction, namely a structure where the rotor pole and the stator pole are independently arranged. In the motor having such a structure, a stator core 90 forming the stator pole 66b is moved by an electromagnetic force generated by an electromagnet 130, the core 90 is used as a piston, one more piston 84 is operated by pressurizing the operating fluid stored in a closed state, and a brake pad 86 is pressed to a brake rotor. A compact hydraulic friction brake device 68 integrated with the stator pole 66b is realized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wheel device for a vehicle such as an automobile, and more particularly to a wheel device incorporating a motor, and to a motor that can be used for various devices and devices including the wheel device.

For example, while the development of electric vehicles and the like is proceeding, a wheel device incorporating a motor called a so-called wheel-in motor has been studied. In particular, an outer rotor type wheel device as described in the following patent document, that is, a wheel device in which a rotor is directly incorporated in a wheel that supports a tire, has a high space efficiency and a high driving force transmission efficiency. Has attracted attention.
Japanese Patent Laid-Open No. 10-305735

  In the wheel device, not only a motor but also a brake device for braking the wheel is required. In today's automobiles, hydraulic friction brakes are the mainstream, and a disc rotor that rotates with the wheel, a brake pad that is pressed against it, and a wheel cylinder that presses the brake pad against the disc rotor are mounted on the wheel system. A so-called drive source (such as a master cylinder) generally has a structure in which it is disposed at a location different from the wheel device. In developing the wheel device with a built-in motor, the present inventor has obtained knowledge that a wheel device with higher space efficiency can be realized in consideration of the brake device. The present invention has been made on the basis of the knowledge to obtain a wheel device with high space efficiency, and to obtain a motor with a brake suitable for various devices and devices including such a wheel device. It was made as an issue.

  In order to solve the above problems, the motorized wheel device with a brake according to the present invention includes (A) a wheel including a substantially cylindrical rim that holds a tire, and (B) a wheel support device that rotatably supports the wheel, (C) A rotor provided on the wheel and a stator provided on the wheel support device are provided in the rim, and includes a motor for rotating the wheel, and (D) a friction brake. (A) a rotating body that rotates with the wheel, (b) one or more friction bodies supported by the wheel support device in a slidable contact state with the rotating body, and (c) a motive force by the supplied electric energy. A motive force generating mechanism that generates the motive force and a urging force converting mechanism that converts the motive force into a pressing force, and a friction body pressing device that presses the one or more friction members against the rotating body by the pressing force. Force generating mechanism is provided in the rim, configured to brake the wheels by the frictional force generated between the rotor and the one or more friction body.

  In order to solve the above problems, a motor with a brake according to the present invention includes (A) a motor housing and a motor shaft that are supported so as to be relatively rotatable with each other by a support mechanism, and (B) one of the motor housing and the motor shaft. A stator provided on the other of the motor housing and the motor shaft, and (D) a friction brake, the friction brake comprising: (a) a motor housing and a motor shaft; (B) one or more friction bodies supported on one of the motor housing and the motor shaft so as to be slidable in contact with the rotating body, and (c) the electric energy supplied. A friction body pressing device that includes a driving force generation mechanism that generates a driving force and a pressing force conversion mechanism that converts the driving force into a pressing force, and presses one or more friction bodies against the rotating body by the pressing force. Chi least driving force generating mechanism is provided in the motor housing, and by the frictional force generated between the rotor and the one or more friction body so as to brake the relative rotation between the motor housing and the motor shaft.

Effects and effects of the invention

  Briefly speaking, the motor-equipped wheel device with a brake according to the present invention is a wheel device in which a friction brake, specifically, a motive power generation mechanism as a driving source thereof is also incorporated in the rim. By incorporating a motive power generation mechanism in the space inside the rim, which is a dead space, a motor-equipped wheel device with high space efficiency is realized. In the wheel device of the present invention, the wheel can be regarded as a motor housing and the wheel device itself can be grasped as a motor. The motor with a brake of the present invention is a motor having such a concept, and is a motor with a brake suitable for the wheel device of the present invention. That is, since a motive power generation mechanism in the friction brake is incorporated, a motor with high space efficiency is realized. In addition, the motor is not limited to the case where it is used for a wheel device, but can be used for other devices, devices, and the like. The device with built-in brake motor, the motor with brake and the specific embodiments or their functions and effects of the present invention will be described in detail in the following [Aspect of the Invention] section.

Aspects of the Invention

  In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”, a concept including the present invention) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the claimable inventions, and is not intended to limit the combinations of the constituent elements constituting those inventions to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In each of the following terms, (1) corresponds to claim 1, (4) corresponds to claim 2, (5) corresponds to claim 3, (6) corresponds to claim 4, (8) is in claim 5, (9) to (11) are combined in claim 6, (12) is in claim 7, (17) is in claim 8, Equivalent to. The (30) term corresponds to the ninth claim.

(1) a wheel having a generally cylindrical rim for holding a tire;
A wheel support device for rotatably supporting the wheel;
A wheel device comprising: a rotor provided on the wheel; and a stator provided on the wheel support device, the motor being provided in the rim and rotating the wheel,
A rotating body that rotates together with the wheel; one or more friction bodies that are supported by the wheel support device in a slidable contact with the rotating body; a motive power generation mechanism that generates motive power by the supplied electric energy; And a friction body pressing device that presses the one or more friction bodies against the rotating body by the pressing force, and at least the motive power generation mechanism is the A brake built-in motorized wheel device further comprising a friction brake provided in a rim and configured to brake the wheel by a frictional force generated between the rotating body and the one or more friction bodies. .

  The mode described in this section relates to an outer rotor type wheel-in motor in which a rotor is provided on a wheel, simply speaking, a mode related to a wheel-in motor that makes the wheel itself function as a rotor, and includes not only a motor but also a friction brake. It is an aspect regarding the wheel apparatus. The inside of the wheel, specifically, the inside of the cylindrical rim is often a dead space, and a motive power generation mechanism that is a drive source of the brake device is disposed in the dead space. Is realized.

  In the aspect described in this section, the “motor” may be an outer rotor type, and the type thereof is not particularly limited. Various motors such as a PM motor using a permanent magnet as a rotor, an induction motor, and a reluctance motor can be used. The “rotor” constituting the friction brake corresponds to, for example, a disc rotor, a drum, or the like. The rotating body may be provided separately from the wheel and attached to the wheel, or a part of the wheel may function as the rotating body. The “friction body” corresponds to a so-called brake pad or brake shoe. “Friction brakes” configured by combining these rotating bodies and friction bodies are, for example, various types such as those belonging to the category of disc brakes, those belonging to the category of drum brakes, or those belonging to other categories. Can be adopted. In addition, one friction body may be in sliding contact with one rotating body, or a plurality of friction bodies may be in sliding contact.

  The so-called generally used hydraulic brake is provided with a master cylinder as a drive source. However, the friction brake described in this section employs only the brake cylinder existing outside the wheel as the drive source. It is not a thing. The “motive force generation mechanism” as a drive source in this embodiment exists in the rim. The term “provided in the rim” simply means that the wheel exists inside the wheel, and that it exists in the space defined by the inner surface of the rim. In a direction parallel to the rotation axis of the wheel, it is desirable that the motive power generation mechanism exists in a state where the rim end is not projected from a plane perpendicular to the rotation axis including the end of the rim. In addition, the aspect described in this section does not exclude an aspect in which an external drive source is added in addition to the motive power generation mechanism. For example, an aspect in which an external drive source is provided in parallel and the operation is performed by switching between the external drive source and the motive power generation mechanism is also included in the aspect described in this section.

  The driving force generated by the driving force generation mechanism (also referred to as driving force or operating force) can be considered as the force when the supplied electric energy is converted into force. As will be described later, for example, electromagnetic force or the like is applicable. In general, a mode in which an electric motor is employed as the driving force generation mechanism and the rotational force of the motor is used as the driving force also corresponds to the mode described in this section.

  (2) The brake built-in motorized wheel device according to item (1), wherein the entire friction brake is provided in the rim.

  The mode described in this section is a mode in which not only the driving force generating mechanism but also the rotating body, the friction body, and the friction body pressing device are all present in the rim. Since the entire friction brake exists in the rim, a wheel device with higher space efficiency is realized.

  (3) The brake built-in motorized wheel device according to (1) or (2), wherein the friction brake exhibits a braking force having a magnitude corresponding to the magnitude of the supplied electric energy.

  In the aspect described in this section, for example, the motive power generation mechanism is configured to generate a motive power having a magnitude corresponding to the magnitude of the supplied electric energy, and the pressing force conversion mechanism converts the motive power to the motive power. The aspect made into the structure converted into the pressing force of the magnitude | size according to the magnitude | size of is included. For example, if the vehicle is equipped with a power supply device that supplies electric energy having a magnitude corresponding to the operation force, operation amount, operation speed, etc. of a brake operation member such as a brake pedal, the operation of the operation member, that is, Thus, it is possible to exert a braking effect according to the intention of the operator. When executing special control such as anti-lock control, traction control control, vehicle stability control, etc., electric energy corresponding to the target braking force determined by the control device that executes these controls is supplied to the motive power generation mechanism. You may be made to do.

  (4) The motive power generation mechanism includes an electromagnet and one or more magnetic path forming bodies each forming a magnetic path around the electromagnet and itself, and the electromagnet and the one or more magnetic path forming bodies The brake-equipped motor-equipped wheel device according to any one of (1) to (3), wherein an electromagnetic force acting between the two is generated as the driving force.

  The mode described in this section includes a mode in which, for example, a magnetic attractive force generated by excitation of an electromagnet is used as the electromagnetic force. Moreover, the specific aspect of this aspect includes, for example, an aspect in which a solenoid is employed as the driving force generating mechanism and the magnetic path forming body functions as a mover. According to the aspect described in this section, the motive power generation mechanism can have a simple structure, and easily has a magnitude corresponding to the magnitude of the electric energy supplied with the electromagnetic force as the motive power. Can be. The aspect described in this section includes an aspect in which one magnetic path forming body is provided for one electromagnet and an aspect in which a plurality of magnetic path forming bodies are provided.

  (5) The stator has one or more stator cores, and each of at least one of the one or more stator cores or at least a part of each function as each of the one or more magnetic path forming bodies. A wheel device with a built-in motor with a brake according to 1.

  The core of the motor is a component that performs a function of forming a magnetic path when generating wheel rotational force. In short, it is a component that functions as a magnetic path forming body in a motor. The aspect described in this section is an aspect in which a component of a wheel device that exhibits a magnetic path forming function that already exists in a wheel-in motor is used as a magnetic path forming member of a motive power generating mechanism. Functionalization can reduce the number of components and reduce the weight of the wheel device. Further, in this aspect, since the stator core or a part of the stator core is a magnetic path forming body, the motive power generation mechanism is provided not on the rotor side but on the stator side. Therefore, it is possible to easily supply electric energy to the motive power generation mechanism. Although not described in this section, the rotor core or a part of the rotor core may be a magnetic path forming body, that is, a motive power generation mechanism may be provided on the rotor side. In that case, a contact power supply means such as a brush or a non-contact power supply means may be employed for supplying electric energy.

(6) The stator includes a plurality of stator cores that are separated in the circumferential direction and do not form a magnetic path that circulates between the stator cores, and coils that are wound around the stator cores, respectively. The rotor includes a plurality of stator poles, and the rotor includes rotor poles each having a plurality of rotor cores that are separated in the circumferential direction and do not form magnetic paths that connect each other, and the motor includes switched reluctance Configured as a motor,
One of the one or more of the plurality of stator cores functions as each of the one or more magnetic path forming bodies.

  The mode described in this section is a mode characterized by the structure of the motor. The motor described in this section is a switched reluctance motor (hereinafter sometimes abbreviated as “SR motor”). SR motors are, for example, (a) excellent in characteristics in low speed and high torque regions, (b) simple and robust rotor structure, and excellent in temperature rise, (c) inexpensive and suitable for mass production. It has various advantages. According to this aspect, a high-performance wheel device that takes advantage of these advantages is realized. Further, the motor described in this section is provided with a coil on the stator side, and does not require a functional component such as a brush, thereby realizing a wheel device having a simple structure. In addition, the weight including the wheel and the rotor is reduced by the absence of the coil.

  The motor described in this section is a motor having a structure in which the cores of the respective poles of the stator and the rotor are not connected in the circumferential direction. In other words, the SR motor has a rotor pole and a stator pole constituted by a so-called circumferential yokeless core. To put it extremely, it is possible to adopt an aspect in which only a plurality of polar bodies are disposed on the inner periphery of the rim and on the outer periphery of the support shaft constituting the wheel support device with a space therebetween. In the case of this aspect, the rotor or the stator is configured as a set of these polar bodies. In general, the core, which is a component forming the magnetic path of the rotor and stator, is made of a magnetic material such as iron (including an iron alloy), so that the rotor and stator are relatively heavy. However, in the aspect described in this section, since the rotor and the stator do not have the circumferential yoke, a relatively lightweight motor is disposed. That is, the output weight density, which is the output per unit weight of the motor, is increased. Further, the reduction in the weight of the motor leads to a reduction in the weight of the wheel combining the wheel and the rotor and the reduction in the weight of the wheel device itself. For example, the unsprung weight in the suspension mechanism can be reduced. In order for the member that holds the rotor pole inside the rim (which may be the wheel itself) and the member that holds the stator pole on the outer periphery of the support shaft not to function as a circumferential yoke, they must be made of an aluminum alloy. It is desirable to be formed from a nonmagnetic material such as. When they are magnetic materials, it is desirable to suppress magnetic flux leakage and the like as much as possible by holding the polar body via an appropriate nonmagnetic material or the like.

  In the embodiment described in this section, the number of rotor poles and stator poles is not particularly limited. For example, various combinations such as 4/6, 6/8, and 8/12 can be adopted as the combination of the number of rotor poles / the number of stator poles. Further, the material of the rotor core and the stator core is not particularly limited, and a commonly used core material, for example, a magnetic steel plate (for example, an iron alloy containing about 3% of silicon) can be used. In the aspect described in this section, the stator core that is separated and disposed in the circumferential direction is the magnetic path forming body in the motive power generation mechanism. In this case, all of the plurality of stator cores may be magnetic path formers, or only some of them may be magnetic path formers.

  (7) The motor has a structure in which a magnetic flux generated by the coil of one of the plurality of stator poles passes through the one stator pole and one of the plurality of rotor poles opposed thereto. The brake built-in motorized wheel device according to item (6).

  In the aspect described in this section, almost no magnetic flux is generated around the rotor pole and the stator pole that are separated from each other in the circumferential direction. Extremely speaking, the motor is configured such that the magnetic flux generated by one coil does not pass through two or more stator poles or through two or more rotor poles. That is, this mode includes a mode in which one stator pole forms a closed magnetic path with one rotor pole. More specifically, for example, at least one of the rotor core and the stator core has a structure having a plurality of protrusions protruding toward the other, and the coil is arranged so that the magnetic flux circulates between the plurality of protrusions and the other. What is necessary is just to arrange | position. It is desirable to provide a plurality of convex portions on both the rotor core and the stator core, arrange the coils so that the plurality of convex portions oppose each other, and the magnetic flux passes through those convex portions. According to the aspect described in this section, the magnetic path is short, and the change in the direction of the magnetic flux (the direction of the internal magnetic field) is small, so that the generation of eddy current can be suppressed. Note that the aspect described in this section is similar to the aspect without the circumferential yoke described above in function and action, and it is more desirable to combine these aspects.

  (8) The brake-equipped motor according to any one of (4) to (6), wherein the one or more magnetic path forming bodies and the electromagnet are arranged to move relative to each other by the electromagnetic force. Wheel device.

  The aspect described in this section includes an aspect in which, for example, the magnetic path forming body and the electromagnet are driven so as to relatively approach each other by a magnetic attraction generated by excitation of the electromagnet. For example, the driving force is a driving force. In this aspect, the electromagnet side may be fixed and the magnetic path forming body side may be movable (including an aspect in which the magnetic path forming body is a mover). Conversely, the magnetic path forming body side is fixed and the electromagnet side is fixed. May be movable. Further, both may be movable.

  (9) The brake-equipped motor built-in wheel according to (8), wherein the one or more friction bodies move by an amount corresponding to a relative movement amount of the one or more magnetic path forming bodies and the electromagnet. apparatus.

  The aspect described in this section can also be grasped as an aspect related to the limitation of the pressing force conversion mechanism. According to the aspect described in this section, it is possible to easily convert the driving force into the pressing force.

  (10) The brake built-in motorized wheel device measures a magnetic flux passing through the magnetic path around the magnetic path forming body and the electromagnet, thereby determining a relative movement amount between the one or more magnetic path forming bodies and the electromagnet. The wheel device with a built-in motor with a brake according to (8) or (9), comprising a movement amount detector for detection.

  For example, if the motive power generating mechanism has a solenoid structure, the magnetic flux flowing in the magnetic path around them changes with the relative movement of the magnetic path forming body and the electromagnet. The aspect described in this section includes an aspect in which the relative movement amount of both is detected by measuring the change in the magnetic flux, for example. For example, detection using a principle such as a so-called eddy current displacement sensor or a differential transformer or a principle similar thereto is included. The relative movement amount can be measured by touching, and it is highly convenient. The detection result of the relative movement amount can be used for various controls, for example, checking whether or not the motive power generation mechanism is operating reliably. Although not in the form described in this section, the relative distance between the magnetic path former and the electromagnet can be set in various ways such as potentiometer, photoelectric element displacement meter, resistance wire strain gauge, induct thin, magnet scale, electric micrometer, etc. It is also possible to adopt a mode in which measurement is performed using the above-described sensor.

  (11) The one or more friction bodies are configured to move by an amount corresponding to a relative movement amount of the one or more magnetic path forming bodies and the electromagnet, and the movement amount detector detects the movement amount detector. The brake-equipped motor-equipped wheel device according to item (10), wherein the movement amount of the one or more friction bodies can be estimated by a relative movement amount.

  When the amount of movement of the friction body is an amount according to the amount of relative movement between the magnetic path forming body and the electromagnet, it is possible to easily estimate the amount of movement of the friction body by detecting the relative movement amount. . For example, when the amount of movement of the friction body is equal to or greater than a set value, it is possible to determine that the friction body is worn beyond the set standard allowable range. According to the aspect described in this section, it is possible to indirectly detect the wear of the friction body in this way.

  (12) The brake-equipped motor according to any one of (1) to (11), wherein the pressing force conversion mechanism operates using a medium of hydraulic fluid, and the friction brake is configured as a hydraulic brake. Built-in wheel device.

  Hydraulic brakes are widely used as general brakes for vehicles, and have a high degree of freedom in the direction of force transmission, high reliability in transmission, and the ability to easily control the magnitude of the converted pressing force. It has the merit of According to the aspect described in this section, it is possible to enjoy the advantages of such a hydraulic brake. In addition, although it is not the aspect described in this section, for example, the driving force for moving the electromagnet and the magnetic path forming body, which are generated by the electromagnetic force, is converted into the pressing force by a pure mechanical mechanism such as a link mechanism. It is also possible to employ such a pressure conversion mechanism.

  (13) The pressing force conversion mechanism includes a hydraulic fluid container that stores hydraulic fluid in a sealed state, and one or more first hydraulic fluids that are operated by the driving force to pressurize the hydraulic fluid in the hydraulic fluid container. Item (12) includes the piston and one or more second pistons, each of which is operated by the pressure of the hydraulic fluid in the hydraulic fluid container and applies the pressing force to each of the one or more friction bodies. Wheel with built-in motor with brake.

The mode described in this section is a mode related to the conversion from the driving force to the pressing force by the hydraulic fluid. For example, if the ratio of the pressure area of the first piston and the pressure receiving area of the second piston is changed, the magnitude of the pressing force with respect to the driving force can be changed. The pressing force conversion mechanism described in this section includes, for example, a configuration including a plurality of cylinder devices each having a piston and a cylinder housing, and a hydraulic fluid pipe connecting the cylinder housings of the plurality of cylinder devices. included. It is also possible to arrange a plurality of pistons in one housing, to make a part of the plurality of pistons function as a first piston, and to make another function as a second piston. That is, it is an aspect in which a plurality of cylinder devices are unitized. In the embodiment described in this section, it can be considered that the portion that includes the second piston and applies the pressing force to the friction body corresponds to a wheel cylinder in a general hydraulic brake device.

(14) The motive force generation mechanism includes an electromagnet, and one or more magnetic path forming bodies that form a magnetic path around the electromagnet and the self, and the electromagnet and the one or more magnetic path forming bodies, The electromagnetic force acting during the generation is generated as the driving force,
The brake built-in motorized wheel device according to item (13), wherein each of the one or more magnetic path forming bodies functions as each of the one or more first pistons.

  The aspect described in this section is an aspect in which the magnetic path forming body itself is the first piston. For example, when the magnetic path forming body is a stator core or a part thereof, it is a mode in which the hydraulic fluid is directly pressurized. The aspect described in this section includes an aspect in which the piston and the stator core are integrated, and the aspect can reduce the number of components and contribute to simplification and weight reduction of the friction brake.

  (15) The brake built-in motorized wheel device according to any one of (1) to (14), wherein a plurality of the motive power generation mechanisms are provided.

  The aspect described in this section includes an aspect in which, for example, a plurality of electromagnets are provided by providing a plurality of electromagnets. According to this aspect, each motive power generating mechanism can be reduced in size, and space efficiency can be improved by distributing the motive power generating mechanisms in one wheel device to a plurality of locations in the rim. . In addition, the aspect described in this section can also include an aspect in which each motive force generation mechanism has a plurality of magnetic path forming bodies.

  (16) The brake built-in motorized wheel device according to item (15), wherein one pressing force conversion mechanism is provided for each of the motive power generation mechanisms.

  According to the aspect described in this section, an aspect including a plurality of friction body pressing devices is realized. Individual friction body pressing devices can be unitized, and further space efficiency can be improved. In addition, although it is not the aspect described in this section, when a plurality of motive force generation mechanisms are provided, it is also possible to adopt an aspect in which the pressing force conversion mechanism is made common to two or more of them.

  (17) The stator includes a plurality of stator cores that are separated in the circumferential direction and do not form a magnetic path that circulates between the stator cores, and coils that are wound around the stator cores, respectively. The rotor includes a plurality of stator poles, and the rotor includes rotor poles each having a plurality of rotor cores that are separated in the circumferential direction and do not form magnetic paths that connect each other, and the motor includes switched reluctance The brake built-in motorized wheel device according to any one of items (1) to (4) configured as a motor.

  (18) The motor has a structure in which a magnetic flux generated by the coil of one of the plurality of stator poles passes through the one stator pole and one of the plurality of rotor poles opposed thereto. The motor-equipped wheel device with a brake according to item (17).

  The above two terms are wheel devices that employ the above-described SR motor regardless of whether the stator core functions as a magnetic path forming body or not. Since the merits and the like by the above two items have been described above, description thereof is omitted here. Note that a combination of the above-described two terms with the technical features described in each of the preceding terms (excluding those already included in the above-mentioned two terms) can also be an aspect of the claimable invention.

(30) a motor housing and a motor shaft supported by a support mechanism so as to be relatively rotatable with each other;
A stator provided on one of the motor housing and the motor shaft;
A rotor provided on the other of the motor housing and the motor shaft, a rotating body that rotates together with the other of the motor housing and the motor shaft, and the motor housing and the motor shaft in a slidable contact with the rotating body. One or more friction bodies supported on one side, a motive power generation mechanism for generating a motive force by the supplied electric energy, and a pressing force conversion mechanism for converting the motive force into a pressing force. A friction body pressing device that presses the friction body against the rotating body, and at least the motive power generation mechanism is provided in the motor housing, and is generated between the rotating body and the one or more friction bodies. A brake-equipped motor comprising: a friction brake that brakes relative rotation between the motor housing and the motor shaft by a frictional force.

  The mode described in this section relates to a motor with a brake. The wheel device described above can be considered as a wheel-in motor in which the wheel is a motor housing and the support shaft included in the wheel support device is a motor shaft. Under such an idea, it can be considered that the category of the invention is changed from the wheel device to the motor as the mode described in this section. In addition, the aspect described in this section can be used as a component of various industrial devices or various devices constituting the device, in addition to the use built in the wheel device as a wheel-in motor. In addition, the aspect described in this section is not limited to the one in which the motor housing rotates, and in this aspect, one in which the motor housing is fixed and the motor shaft rotates is included. Furthermore, each aspect obtained by adding the technical features described in the respective sections related to the wheel device to the aspect described in this section can be an aspect of the claimable invention. Since the description of those aspects overlaps with the above description, it is omitted here.

  (31) The motive force generation mechanism includes an electromagnet and one or more magnetic path forming bodies that form a magnetic path around each of the electromagnet and itself, and the electromagnet and the one or more magnetic path forming bodies; And the stator has one or more stator cores, each of at least one of the one or more stator cores or at least a part of each of the stator cores, The motor with a brake according to item (30), which functions as each of the one or more magnetic path forming bodies.

  (32) The brake-equipped motor according to (30) or (31), wherein the pressing force conversion mechanism operates using a medium of hydraulic fluid, and the friction brake is configured as a hydraulic brake.

  (33) The stator includes a plurality of stator cores that are separated in the circumferential direction and do not form a magnetic path that circulates between the stator cores, and coils that are wound around the stator cores, respectively. The rotor includes a plurality of stator poles, and the rotor includes rotor poles each having a plurality of rotor cores that are separated in the circumferential direction and do not form magnetic paths that connect each other. The motor with a brake according to any one of (30) to (32), configured as a motor.

  The aspect described in the above three terms is an aspect related to a representative one of the aspects to which the technical features described in several terms related to the wheel device described above are added. Since the description of the aspect of each term overlaps with the description of the corresponding term regarding the wheel device, it is omitted here.

  Hereinafter, embodiments of the present invention and modifications thereof will be described in detail with reference to the drawings. In addition to the following examples, the present invention is implemented in various modes including various modes modified and improved based on the knowledge of those skilled in the art, including the mode described in the above [Mode of Invention]. be able to.

<Overall configuration of motor-equipped wheel device with brake>
FIG. 1 shows a front view of a wheel device with a built-in motor as a working example of the present invention (viewed from a direction parallel to the rotation axis), and FIG. 2 shows a plane including the rotation axis of the wheel device. Sectional drawing (AA sectional drawing in FIG. 1) is shown. FIG. 1 is a view in which a part of the wheel cover is removed, and some components are partially shown in cross section. Further, in FIG. 2, a stator / brake unit described later is shown instead of a cross section, and a cross section of a different place is shown for a place where the mounting bolts are present.

  The brake built-in motor-equipped wheel device 10 (hereinafter may be abbreviated as “wheel device 10”) includes a wheel 14 that supports the tire 12, a wheel support device 16 that rotatably supports the wheel 14, and a wheel cover 18. It is comprised including.

  The wheel 14 is made of an aluminum alloy and has a rim 20 formed in a substantially cylindrical shape. The tire 12 is supported on the outer periphery of the rim 20. The wheel 20 has flanges 22 and 24 on the outer side and the inner side, respectively, and the wheel cover 18 is attached to the outer flange 22. More specifically, the outer flange 22 has eight female screw holes 26 formed at an equal pitch over the entire circumference, and the mounting bolts 28 are inserted into the mounting holes formed in the outer peripheral end of the wheel cover 18. Thus, the wheel cover 18 is attached to the wheel 14 by screwing the attachment bolt 28 and the female screw hole 26.

  The wheel support device 16 includes a pipe-shaped support shaft 30 whose outer peripheral surface is stepped, a stator support base material 34 having a hexagonal cylindrical outer periphery and a boss 32 at the center, and a generally disk shape. A wheel support disk 38 having a boss 36 at the center is included. The stator support base material 34 is fixed to the support shaft 30 with the boss 32 inserted through a small diameter portion that is one end portion of the support shaft 30. The wheel support disk 38 is rotatably supported by the support shaft 30 by interposing two bearings 40 between the medium diameter portion following the small diameter portion of the support shaft 30 and its own boss 36. In addition, the large-diameter part following the intermediate-diameter part of the support shaft 30 is connected to a suspension device (not shown) (in the case of a steered wheel, it is also connected to a steered device), so that the wheel device 10 is Suspended by.

  The wheel 14 is attached to the outer periphery of the wheel support disk 38. More specifically, eight female screw holes 42 are formed at equal pitch intervals on the outer periphery of the wheel support disk 38, and the mounting bolts 44 are inserted into the mounting holes formed at the same pitch in the inner flange 24. In this state, the mounting bolt 44 is screwed into the female screw hole 42, whereby the wheel 14 is attached to the wheel support disk 38 (actually, this is performed via a brake rotor 46 described later). ing). With such a structure, the wheel 14 is supported so as to be rotatable about the axis, with the center axis of the support shaft 30 as the rotation axis M.

  Four rotor poles 50 are arranged on the inner circumference of the rim 20 of the wheel 14 on the circumference of the rotation axis M at equal pitch intervals in the circumferential direction. Each rotor pole 50 is configured as a pole body mainly composed of a rotor core 52. The rotor core 52 is formed by laminating electromagnetic steel sheets having a generally E shape. Therefore, the rotor core 52 has three convex portions 54 a, 54 b, 54 c (hereinafter may be collectively referred to as “convex portions 54”) facing the rotation axis M, and a yoke portion 56 that connects these convex portions 54. It is said that. Ribs 58 are formed on the inner peripheral portion of the rim 20, and the rotor core 52 is fixed to the inner peripheral surface of the rim 20 in a state of being sandwiched between the ribs 58 and the outer flange 22. 60 is fixed to the wheel 14. The three convex portions 54 of the respective rotor cores 52 are arranged in a direction parallel to the rotation axis M, and the convex end surfaces of the respective rotor cores 52 are positioned on one cylindrical surface centering on the rotation axis M. Further, it is formed in an arcuate concave surface. A rotor in the motor included in the wheel device 10 is configured including the four rotor poles 64.

  A brake rotor 46 is disposed on the inner periphery of the rim 20 of the wheel 14. The brake rotor 46 has a generally donut shape, and the mounting bolt 44 described above is inserted into a mounting hole provided in the brake rotor 46, and is fastened to the wheel support disk 38 together with the wheel 14 by the mounting bolt 44. . As will be described later, the brake rotor 46 is a component of the friction brake, functions as a rotating body that rotates together with the wheel 14, and makes the brake pad slidably contact on the inner peripheral end surface.

  The outer periphery of the stator support base 34 provided in the wheel support device 16 includes three stator poles 66a each as a single unit, each of the stator poles 66b and the main part of the friction brake, and these are unitized. Three stator / brake units 68 (hereinafter sometimes abbreviated as “S / B unit 68”) are arranged. The structures of the S / B unit 68 and the stator poles 66a and 66b (hereinafter may be collectively referred to as “stator pole 66”) will be described in detail later. The three stator poles 66a and the three S / B units 68 are each in a state in which the stator poles 66 are on the same circumference around the rotation axis M and at equal pitches in the circumferential direction. It is arranged every other. The S / B unit 68 is fixed in a state in which the bottom thereof is in contact with one of the six planes constituting the outer peripheral surface of the stator support base 34, and the stator pole 66a is An aluminum alloy mounting base 70 is fixed to one of the two planes. A stator in the motor included in the wheel device 10 is configured including the six stator poles 66.

<Configuration of stator / brake unit>
FIG. 3 is a perspective view of the stator / brake unit 68 included in the wheel device 10, FIG. 4 is a sectional view in a plane including the rotation axis M thereof, and FIG. 5 is a view perpendicular to the rotation axis M thereof. Cross-sectional views in plan are shown respectively. 5A shows a BB cross section in FIG. 4, and FIG. 5B shows a CC cross section in FIG. Generally speaking, the S / B unit 68 is constructed by assembling various components into a unit housing 80 made of aluminum alloy formed by casting, and the main components are the stator pole 66b. , Electromagnet 82, plunger piston 84, brake pad 86, and the like.

  The stator pole 66b is configured as a pole body mainly composed of the stator core 90 and the drive coil 92. The stator core 90 is formed by laminating electromagnetic steel sheets having a generally E shape. Therefore, the stator core 90 includes three convex portions 94a, 94b, 94c (hereinafter, may be collectively referred to as “convex portions 94”) facing the rotor pole 50 (upward in the drawing) and the convex portions. 94 has a yoke portion 96 that connects 94. The drive coil 92 is provided with a stator pole 66b by winding a coil wire around a central convex portion 94b. In addition, some of the central portions in the stacking direction have a shape protruding in a direction opposite to the convex portion 94 (downward in the drawing), and the protruding portion of the stator core 90 is stacked. It is set as the shape which has the two protrusion parts 98 made. Here, the stator pole 66a described above will also be described. The stator pole 66a has a shape and a structure substantially equal to those obtained by removing the two projecting portions 96 from the stator pole 66b, and each stator pole 66a. , 66b are arranged in the wheel device 10, the three convex portions 94 of each stator core 90 are arranged in a direction parallel to the rotational axis M, and the convex end surfaces of the respective stator cores 90 are arranged in the rotational axis. An arcuate convex surface is formed so as to be located on one cylindrical surface centering on M. Further, each of the three convex portions 94 of each stator core 90 opposes each of the three convex portions 54 of the rotor core 52 described above (see FIG. 2).

  The unit housing 80 has two large and small openings, and the stator pole 66 b is disposed in the larger opening 100. The wall surface 110 on the opening side (the upper side in the drawing) of the large opening 100 is a surface on which the stator core 90 is slidably contacted, and the stator core 90 is guided by the wall surface 110 and can move along the wall surface 110 (see FIG. It is possible to move in the vertical direction). Stopper bars 112 serving as locking members are attached to the two positions of the opening end of the unit housing 80 by countersunk bolts 114, and stepped portions provided on the stopper bars 112 on the convex portions 94a and 94c of the stator core 90. Is locked, the movement limit of the stator core 90 toward the opening side (upward movement limit in the figure) is defined. Further, a protrusion 116 is formed at the bottom of the unit housing 80 toward the opening, and the tip end surface of the protrusion 116 abuts against the yoke 96 of the stator core 90 so that the stator core 90 moves toward the bottom. A limit (downward movement limit in the figure) is defined. A compression coil spring 118 as a biasing member is disposed between the bottom of the opening 100 and the yoke portion 96 of the stator core 90, and the stator core 90 is constantly biased toward the opening by the coil spring 118. Therefore, in a normal state, the stator core 90 is positioned at the movement limit position to the restricted opening side. In order to secure the sealing of the opening 100 by the stator core 90, the corner portion of the wall surface 110 of the opening portion 100 and the corner portion of the stator core 90 are formed in an appropriate arc shape, and the wall surface 110 has a sealing material as a sealing material. The O-ring 120 is attached. Further, in order to improve the sealing property and the sliding characteristics with the wall surface 110, the surface of the stator core 90 (excluding the convex end surface of the convex portion 94) is subjected to a predetermined surface treatment (for example, hard metal plating). Is given.

  The electromagnet 82 is fixedly disposed on the bottom of the larger opening 100 of the unit housing 80. The electromagnet 82 includes a pair of electromagnet cores 130 and an electromagnet coil 132. Each of the electromagnet cores 130 is generally formed by laminating short U-shaped electromagnetic steel plates with one upright portion 134, and the longer upright portion 136 extends along the longitudinal wall surface of the opening 100. It is arranged in a state. The wall surface on the bottom side of the opening 100 is retracted so that the interval between the standing portions 136 is slightly longer than the length of the stator core 90 in the longitudinal direction. The dimension of the electromagnet core 130 is determined so that the interval between the shorter standing parts 134 is slightly larger than the outer dimension of the two projecting parts 98 of the stator core 90. Due to such a structure, even when the stator core 90 moves to the bottom side, the electromagnet core 130 does not interfere. The electromagnet coil 132 is provided by winding a coil wire around the two shorter standing portions 134. As will be described in detail later, a search coil 138 in which a coil wire is wound around the proximal end portions of the two projecting portions 98 of the stator core 90 is provided as related to the electromagnet 82.

  The smaller opening of the unit housing 80 is a through hole. The large-diameter cylindrical hole 140 that leads to the bottom side, the small-diameter cylindrical hole 142 that follows, and the angle that leads to the opposite side of the bottom side. The hole 144 is divided into three parts. Plunger pistons 84 are disposed in the large diameter cylindrical hole portion 140 and the small diameter cylindrical hole portion 142 so as to engage with them. A closing lid 146 is screwed onto the bottom side of the large diameter cylindrical hole 140, and the bottom side of the large diameter cylindrical hole 140 is sealed by the closing lid 146 after the plunger piston 84 is disposed. The The plunger piston 84 can be divided into a large-diameter head portion 160 and a small-diameter rod portion 162, and the head portion 160 slides on the large-diameter cylindrical hole portion 140 via an O-ring 164 for ensuring sealing. The rod portion 162 is in sliding contact with the small diameter cylindrical hole portion 142. The inner peripheral surface of the small-diameter cylindrical hole portion 142 functions as a guide surface for the rod portion 162, and the plunger piston 84 can move along its guide surface in its own axial direction (vertical direction in the figure). . A compression coil spring 166 as an urging member is disposed between the head portion 160 and the stepped surface of the large-diameter cylindrical hole portion 140 on the small-diameter cylindrical hole portion 142 side. The unit housing 80 is biased toward the bottom.

  In the square hole portion 144, the brake pad 86 is inserted. The brake pad 86 includes a backup member 180 and a friction member 182 fixed to the backup member 180, and is disposed so that a part of the friction member 182 protrudes from the unit housing 80 in the disposed state. The brake pad 86 is fitted into the square hole portion 144 with a slight gap, and can be moved forward and backward while being guided by the wall surface of the square hole portion 144. The distal end of the rod portion 162 of the plunger piston 84 protrudes into the square hole portion 144, and the protruding end portion is fitted into the rod hole 184 provided in the backup member 180. The backup member 180 is provided with a female screw hole, and the brake pad 86 is prevented from being detached from the rod portion 162 by a set bolt 186 screwed into the female screw hole. The brake pad 86 is replaced by loosening the set bolt 186. With the structure as described above, the brake pad 86 is fed and unloaded from the unit housing 80 as the plunger piston 84 moves in the axial direction. The protruding end surface of the friction member 180 is formed in an arc shape along the inner peripheral surface of the brake rotor 46 described above, and the protruding end surface of the friction member 180 is in sliding contact with the brake rotor 46 when the brake pad 86 is extended. Become. That is, the brake pad 86 functions as a friction body that is in sliding contact with the brake rotor 46 as a rotating body in the friction brake.

  Inside the unit housing 80, brake oil as hydraulic fluid is accommodated in a sealed state. More specifically, the space surrounded by the larger opening 100 and the stator core 90 is defined as the first liquid chamber 190, and the large-diameter cylindrical hole 140 of the smaller opening and the rod 162 of the plunger piston 84. The space surrounded by the tip of the second chamber is a second fluid chamber 192, and both fluid chambers 190, 192 are filled with brake oil. The partition wall that divides both the liquid chambers 190 and 192 is provided with two communication passages 194 that communicate with both the liquid chambers 190 and 192. The liquid chambers 190 and 192 can be moved back and forth. With such a configuration, the brake pad 86 is fed out and fed in with the movement of the stator core 90.

<Motor operation, etc.>
As described above, the motor included in the wheel device 10 is provided on the outer periphery of the rotor constituted by the four rotor poles 50 provided on the inner periphery of the rim 20 of the wheel 14 and the stator support base material 34 of the wheel support device 16. And a stator constituted by six stator poles 66 provided, and is configured as a switched reluctance motor. Due to the structure described above, unlike a general switched reluctance motor, there is no circumferential yoke that connects the rotor cores 52 of the rotor poles 50 in the circumferential direction, and the stator cores 90 of the stator poles 66 are connected in the circumferential direction. There is also no circumferential yoke.

  FIG. 6 schematically shows a state in which one rotor pole 50 and one stator pole 66 face each other. In the state shown in FIG. 6, the three convex portions 54a, 54b, 54c of the rotor core 52 included in the rotor pole 50 and the three convex portions 94a, 94b, 94c of the stator core 90 included in the stator pole 66 have a small gap 210. Opposite across. In this state, when the drive coil 92 included in the stator pole is energized, a flow of magnetic flux as shown by a broken line in the figure occurs. That is, the magnetic path extending between the rotor core 52 and the stator core 90 includes an annular shape that surrounds the convex portions 54b and 54a and the convex portions 94a and 94b, and an annular shape that surrounds the convex portions 54b and 54c and the convex portions 94c and 94b. Two magnetic fluxes are formed so as to line up and pass through the magnetic path formed as such.

  FIG. 7 schematically shows the rotation operation of the motor. In the figure, as a typical motor provided in the wheel device 10, a motor 218 including a rotor 214 provided with four rotor poles 50 and a stator 216 provided with six stator poles 66 is provided. It is shown. For convenience, the four rotor poles 50 are divided into two groups [A] and [B] with those having phases different from each other by 180 °, and the six stator poles 66 are conveniently provided. Specifically, those having a phase difference of 180 ° are divided into three groups, [a], [b], and [c], as one group. In the following description, for example, the rotor pole 50 belonging to the group [A] is referred to as the rotor pole [A] (the same applies to other groups), and the stator pole 66 belonging to the group [a] is referred to as the stator pole [a]. (Same for other groups).

  In the state shown in <1> of FIG. 7, the rotor 214 is positioned at a rotational position where the rotor pole [A] and the stator pole [a] face each other. In this state, if the drive coil 92 of the stator pole [b] is energized, a magnetic flux as shown by a broken line is generated, and a magnetic attractive force is generated between the rotor pole [B] and the stator pole [b]. A torque that rotates the rotor 214 counterclockwise is generated. As a result, the state shifts to the state shown in FIG. This state is a state in which the rotor 214 is located at a rotational position where the rotor pole [B] and the stator pole [b] are opposed to each other. In that state, next, the energization to the stator pole [b] is cut off and the energization to the stator pole [c] is started. In that case, an attractive force is generated between the rotor pole [A] and the stator pole [c], and a torque for rotating the rotor 214 counterclockwise is also generated. Next, the state shown in FIG. 7 <3> is a state where the rotor pole [A] and the stator pole [c] face each other, and if the stator pole [a] is energized in that state, the counterclockwise rotation is similarly performed. The torque to rotate is generated. Thus, the wheel 10 is continuously rotated by continuously rotating the rotor 214 of the motor 218 by repeatedly energizing [a] → [b] → [c] → [a] →. If the order of energization is changed from [a] → [c] → [b] → [a] →.

  As can be understood from the above description, the motor 218 provided in the wheel device 10 is different from a normal SR motor so as not to generate a magnetic flux that passes through the plurality of rotor poles 50 and the stator poles 66 across the circumferential direction. ing. Therefore, there is almost no change in the direction of the magnetic flux, and the motor has little so-called hysteresis loss.

  The motor 218 is controlled by a control power supply device (not shown) provided in the vehicle. The control power supply is the same as that of a general SR motor, and the description in this specification is omitted. The wheel device 10 includes an encoder 220 at the tip of the support shaft 30 (see FIG. 2), so that the rotational angle position of the wheel 14 is always detected, and the rotational speed is also obtained by calculation. The control power supply device controls the switching timing of the energized drive coil 92 and the magnitude of the energized electric energy based on these detection / acquisition results. The drive coil 92 is energized with a constant DC current. The magnitude of the electric energy is controlled by changing the average energization current amount by PWC (pulse width control). The target amount of electric energy is determined according to the amount of operation of an operation member such as an accelerator pedal.

<Activation of friction brake, etc.>
FIG. 8 is a diagram for explaining the operation of the friction brake. The friction brake 230 included in the wheel device 10 includes three S / B units 68 (only one is shown in the drawing) provided in the wheel support device 16, and a brake rotor 46 provided in the wheel 14. It is comprised including. Since the configuration of the S / B unit 68 is as described above, a description thereof is omitted here. The electromagnet 82 provided in the S / B unit 68 is connected to a power supply device 232 that exists outside the wheel device 10, and the power supply device 232 is under the control of an electronic control unit (ECU) 234 mainly composed of a computer. Thus, electric energy is supplied to the electromagnet coil 132 of the electromagnet 82. The vehicle is provided with an operation force sensor 238 that detects an operation force of a brake pedal 236 that is a brake operation member. The ECU 234 determines a target braking force based on a signal detected by the operation force sensor 238, and A signal related to the target current amount for obtaining the target braking force is output to the power supply device 232. Based on the signal related to the target current amount, the power supply device 232 causes a direct current of the current amount to flow through the electromagnet coil 132. The power supply device 232 is configured to supply a pulse current having a constant current but a pulse width corresponding to the target current amount by PWC (pulse width control).

  When the electromagnet coil 132 is energized, a magnetic flux as indicated by a broken line in the figure is generated between the two electromagnet cores 130 and the stator core 90 provided in the electromagnet 82. That is, the S / B unit 68 has a structure in which a magnetic path around the stator core 90 and the electromagnet core 130 is formed, and the stator core 90 functions as a magnetic path forming body in relation to the electromagnet 82. To do. When the magnetic flux is generated, the stator core 90 receives a driving force in a direction of moving in the direction approaching the electromagnet 82 (downward in the drawing) by the magnetic attraction force, which is a kind of electromagnetic force, and moves in that direction. To do. The driving force, that is, the electromagnetic force is the driving force that becomes the basis of the braking force in the friction brake 230, and the driving force generating mechanism is configured by the electromagnet 82 and the stator core 90. The protruding portion 98 that forms the magnetic path on the stator core 90 side is a tapered surface 240 at a portion facing the electromagnet core 130. The tapered surface 240 functions to make the control easier by optimizing the magnetic flux when the generated electromagnetic force is controlled to a magnitude corresponding to the magnitude of the electrical energy.

  When the stator core 90 moves toward the electromagnet 82, the volume of the first liquid chamber 190 of the S / B unit 68 decreases, and the brake oil in the first liquid chamber 190 passes through the communication path 194 to form the second liquid chamber. 192 and the volume of the second liquid chamber 192 is increased, whereby the plunger piston 84 moves away from the bottom of the S / B unit 68 (upward in the drawing), whereby the brake pad 86 is moved. It moves in a direction approaching the brake rotor 46. After the brake pad 86 moves by the gap 242 existing between itself and the brake rotor 46 and the friction member 182 contacts the inner peripheral surface of the brake rotor 46, the brake pad 86 corresponds to the driving force of the stator core 90. A pressing force having a magnitude corresponding to the pressure is applied to the brake pad 86, and a frictional force having a magnitude corresponding to the pressing force is generated between the brake rotor 46 and the brake pad 86, depending on the magnitude of the frictional force. Braking force can be obtained. That is, the S / B unit 68 includes a pressing force conversion mechanism that converts the driving force into a pressing force to the brake pad 84. The pressing force conversion mechanism is provided in the starter core 90 and the unit housing 80. The first liquid chamber 190, the second liquid chamber 192, the communication path 194, the plunger piston 84, and the like are formed. In addition, the pressing force conversion mechanism operates using brake oil, which is hydraulic fluid, as a medium, so that the friction brake 230 is a hydraulic brake. More specifically, the unit housing 80 has a first liquid chamber 190, a second liquid chamber 192, and a communication path 194, and functions as a hydraulic fluid storage container that stores brake oil in a sealed state therein. As the first piston that pressurizes the stored brake oil, the plunger piston 84 functions as a second piston that operates by the pressure of the brake oil and applies a pressing force to the brake pad 86. is there. In addition, since the friction body pressing device is configured to include the portion excluding the brake pad 86 in the S / B unit 68, in other words, including the portion constituting the motive power generation mechanism and the pressing force conversion mechanism. is there.

  In the wheel device 10, the amount of wear of the friction member 182 of the brake pad 86 can be estimated. The S / B unit 68 is provided with a search coil 138 formed by being wound around the protruding portion 98 of the stator core 90. The search coil 138 measures the magnetic flux generated by the electromagnet 82. Since the magnetic flux changes according to the movement amount of the stator core 90, the movement amount of the stator core 90 is detected by measuring the change of the magnetic flux. Although a specific description is omitted, the current supplied to the electromagnet coil 132 is a pulse current and also acts as an alternating current, and therefore can be easily detected. That is, the search coil 138 functions as a movement amount detector. The output of the search coil 138 is input to the ECU 234. The ECU 234 stores data (map data) for determining the amount of movement based on the target current amount of the current supplied to the electromagnet coil 132 and the output signal value of the search coil 138. Based on this, the amount of movement is certified. Because of the structure of the S / B unit 68, the brake pad 86 moves by a movement amount corresponding to the movement amount of the stator core 90, so the movement amount of the brake pad 86 is estimated based on the certified movement amount of the stator core 90. As a result of the estimation, if it is determined that the amount of movement of the brake pad 86 exceeds the set value, the wear of the friction member 182 is recognized as a predetermined amount or more, and a predetermined alarm is issued through the alarm device 244.

<Modifications>
In the wheel device 10 of the above-described embodiment, a friction brake is adopted in which the stator core 90 itself is a piston. Instead of this mode, a friction brake having a mode as shown in FIG. 9 may be employed. In the configuration shown in FIG. 9, the electromagnet 260 includes one U-shaped electromagnet core 262 and two electromagnet coils 264. A pair of guide devices 266 is provided between the stator core 90 as a magnetic path forming body and the yoke portion of the electromagnet core 262, and the stator core 90 is moved while being guided by the guide devices 266. . Further, a first cylinder device 270 is further provided between the stator core 90 and the yoke portion of the electromagnet core 262. The wheel device is provided with a second cylinder device 272 that is separate from the wheel device, and the brake pad 86 is pressed against the brake rotor by the second cylinder device 272. And the 1st cylinder apparatus 270 as an apparatus provided with the said 1st piston and the 2nd cylinder apparatus 272 as an apparatus provided with the said 2nd piston are by hydraulic fluid piping 274 (it may be flexible). The electromagnetic force generated by the electromagnet 260 is connected and converted into a pressing force to the brake pad 86. In this way, if the pressing force conversion mechanism is constituted by the two cylinder devices 270 and 272, the degree of freedom of the location of the friction brake, particularly the location of the brake pad 86, is increased. Further, by adjusting the ratio of the diameters of the cylinder devices 270 and 272 (strictly, the ratio of the pressure receiving area of the piston), it is possible to convert the pressure to a pressing force larger than the driving force. When a plurality of first cylinder devices 270 are provided corresponding to each of the plurality of stator cores 90 and a plurality of second cylinder devices 272 are provided corresponding to each of the plurality of brake pads 86, Can be used in common. By doing so, the pressing force by each of the plurality of second cylinder devices 272 can be easily equalized.

  Although the wheel device 10 of the above-described embodiment is a wheel device incorporating a motor that operates as described above, it can be considered that the wheel device 10 is a motor itself if viewed from a different viewpoint. As can be seen with reference to FIGS. 1 and 2, the wheel 14 can be regarded as a motor housing, and more specifically, can be regarded as a motor housing including the wheel 14, the wheel cover 18, and the wheel support disk 38. Further, the support shaft 30 can be regarded as a motor shaft. It can be considered that these are motors that rotate relative to each other via a bearing 40 as a support mechanism. If it grasps like that, the motor is a motor constituted including a friction brake, and the motor is not only used as a motor with a brake to be built in a wheel device, but also in various fields of other fields. It can also be used in devices and various devices constituting those devices.

It is a front view which shows the motor built-in wheel apparatus with a brake which is an Example of this invention. It is sectional drawing in the plane containing the rotating shaft line of the wheel apparatus wheel apparatus shown in FIG. FIG. 2 is a perspective view of a stator / brake unit provided in the wheel device shown in FIG. 1. FIG. 4 is a cross-sectional view of a plane including a rotation axis of the stator / brake unit shown in FIG. 3. FIG. 4 is a cross-sectional view of the stator / brake unit shown in FIG. 3 on a plane perpendicular to the rotation axis. FIG. 2 is a schematic diagram showing a state in which one rotor pole and one stator pole face each other and the flow of magnetic flux in that state in the motor of the wheel device shown in FIG. 1. It is a schematic diagram which shows rotation operation | movement of the motor with which the wheel apparatus shown in FIG. 1 is provided. It is a figure for demonstrating operation | movement of the friction brake with which the wheel apparatus shown in FIG. 1 is provided. It is a schematic diagram which shows the modification regarding a friction brake.

Explanation of symbols

  10: Wheel device with built-in motor with brake (motor with brake) 12: Tire 14: Wheel (motor housing) 16: Wheel support device 20: Rim 30: Support shaft 34: Stator support base material 38: Wheel support disk 40: Bearing ( Support mechanism) 46: Brake rotor (rotating body) 50: Rotor pole 54: Convex part 54 66: Stator pole 68: Stator / brake unit (friction body pressing device, pressing force conversion mechanism, motive power generating device) 80: Unit housing 82 : Electromagnet 84: Plunger piston (second piston) 86: Brake pad (friction body) 90: Stator core (magnetic path forming body, first piston) 92: Drive coil 94: Convex portion 130: Electromagnet core 132: Electromagnet coil 138: 182: Friction member 190: First liquid chamber 192: Second liquid chamber 194: Communication path 214: Rotor 216: Stator 218: Motor 230: Friction brake 260: Electromagnet 262: Electromagnet core 264: Coil for electromagnet 270: first cylinder device 270: second cylinder device 274: hydraulic fluid piping

Claims (9)

A wheel with a generally cylindrical rim that holds the tire;
A wheel support device for rotatably supporting the wheel;
A wheel device comprising: a rotor provided on the wheel; and a stator provided on the wheel support device, the motor being provided in the rim and rotating the wheel,
A rotating body that rotates together with the wheel; one or more friction bodies that are supported by the wheel support device in a slidable contact with the rotating body; a motive power generation mechanism that generates motive power by the supplied electric energy; And a friction body pressing device that presses the one or more friction bodies against the rotating body by the pressing force, and at least the motive power generation mechanism is the A brake built-in motorized wheel device further comprising a friction brake provided in a rim and configured to brake the wheel by a frictional force generated between the rotating body and the one or more friction bodies. .   The motive power generation mechanism includes an electromagnet and one or more magnetic path forming bodies each forming a magnetic path around the electromagnet and itself, and between the electromagnet and the one or more magnetic path forming bodies. The wheeled motor built-in wheel device according to claim 1, wherein an acting electromagnetic force is generated as the driving force.   The brake according to claim 2, wherein the stator has one or more stator cores, and each of at least one of the one or more stator cores or at least a part of each of them functions as each of the one or more magnetic path forming bodies. Wheel device with built-in motor. A plurality of stators each having a plurality of stator cores that are separated in the circumferential direction and do not form a magnetic path that circulates between the stator cores and coils that are wound around the stator cores. The rotor includes a rotor pole having each of a plurality of rotor cores that do not form a magnetic path that is separated in the circumferential direction and connects each other, and the motor is configured as a switched reluctance motor And
The brake built-in motorized wheel device according to claim 3, wherein each of one or more of the plurality of stator cores functions as each of the one or more magnetic path forming bodies.   The brake built-in motorized wheel device according to any one of claims 2 to 4, wherein the one or more magnetic path forming bodies and the electromagnet are disposed so as to move relative to each other by the electromagnetic force.   The one or more friction bodies are structured to move by an amount corresponding to a relative movement amount between the one or more magnetic path forming bodies and the electromagnet, and the motor-equipped wheel device with a brake includes the magnetic path forming body and A movement amount detector for detecting a relative movement amount between the one or more magnetic path forming bodies and the electromagnet by measuring a magnetic flux passing through a magnetic path around the electromagnet, and detected by the movement amount detector; The wheeled motor built-in wheel device according to claim 5, wherein the movement amount of the one or more friction bodies can be estimated from the relative movement amount.   The wheeled motor built-in wheel device according to any one of claims 1 to 6, wherein the pressing force converting mechanism is operated by using a hydraulic fluid as a medium, and the friction brake is configured as a hydraulic brake.   A plurality of stators each having a plurality of stator cores that are separated in the circumferential direction and do not form a magnetic path that circulates between the stator cores and coils that are wound around the stator cores. The rotor includes a rotor pole having each of a plurality of rotor cores that do not form a magnetic path that is separated in the circumferential direction and connects each other, and the motor is configured as a switched reluctance motor The brake built-in motorized wheel device according to claim 1 or 2. A motor housing and a motor shaft which are supported by a support mechanism so as to be rotatable relative to each other;
A stator provided on one of the motor housing and the motor shaft;
A rotor provided on the other of the motor housing and the motor shaft, a rotating body that rotates together with the other of the motor housing and the motor shaft, and the motor housing and the motor shaft in a slidable contact with the rotating body. One or more friction bodies supported on one side, a motive power generation mechanism for generating a motive force by the supplied electric energy, and a pressing force conversion mechanism for converting the motive force into a pressing force. A friction body pressing device that presses the friction body against the rotating body, and at least the motive power generation mechanism is provided in the motor housing, and is generated between the rotating body and the one or more friction bodies. A brake-equipped motor comprising: a friction brake that brakes relative rotation between the motor housing and the motor shaft by a frictional force.

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