JP2017158332A - Power seat device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power seat device using a motor as a driving source and having a simple structure which inhibits occurrence of radiation sounds with a simple structure.SOLUTION: A motor 20 used in a power seat device 10 includes: a commutator 45 formed on an outer peripheral surface 40a of a rotor 40; a brush 50 which slidably contacts with the commutator 45; a motor case 30 which stores the rotor 40 and holds the brush 50; and a coupler 60 provided on an outer surface 30a of the motor case 30. The motor 20 includes a biasing member 70 which covers the coupler 60 so as to elastically bias the coupler 60 in a direction toward the motor case 30.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a power seat device that adjusts the state of a vehicle seat using a motor as a drive source.

  As a technique for electrically adjusting the position of the vehicle seat in the front-rear direction and the reclining adjustment of the seat back, for example, there is a configuration using a motor disclosed in Patent Document 1. Such a motor is configured as a motor with a brush, for example, and includes a motor case (yoke) in which a pair of magnets are fixed to an inner peripheral surface, and an armature having an armature shaft inside the motor case is rotatable. Contained. This armature includes a plurality of armature coils and a commutator (commutator) for supplying current to the armature coils. A plurality of brushes fixed to the motor case are in sliding contact with the outer periphery of the commutator, and when each brush is connected to a power source, current is supplied to each armature coil via the brush and the commutator at a predetermined timing. The armature is designed to rotate. Further, the motor case is configured to include a coupler in which a power supply connector for power feeding is fitted to the outside of the case.

JP 2007-252105 A

  However, when a brushed motor as in Patent Document 1 is operated to adjust the position of the vehicle seat in the front-rear direction, unpleasant noise due to the operation of the motor may be generated from the motor or its periphery. This is because the armature rotates and vibrates to these members due to the continuous sliding contact between the brush and the commutator when operating with the motor assembled to the seat device (coupler connected to the power connector). This is due to the fact that vibration is propagated to the coupler through the motor case and radiated sound is generated from the coupler to which the power connector is connected. In order to suppress the generation of this radiated sound, it is conceivable to optimize the shape and material of the brush, optimize the material of the motor case, adjust the surface roughness of the commutator, etc. With this measure, it may not be possible to suppress the generation of radiated sound from a portion where measures such as a coupler connected to the power connector are not taken.

  The present invention has been made to solve the above-described problem, and is a power seat device using a motor as a drive source, and an object thereof is to provide a configuration capable of suppressing the generation of radiated sound with a simple configuration. And

In order to achieve the above object, the invention according to claim 1 is a power seat device (10) for adjusting the state of a vehicle seat (11) using a motor (20) as a drive source, The motor includes a commutator (45) formed on the outer peripheral surface of the rotor (40), a brush (50) that is in sliding contact with the commutator, and a case (30) that houses the rotor and holds the brush. A coupler (60) provided on the outer surface (30a) of the case so that an electric current supplied from the external connector connected to a power source is supplied to the brush, and the coupler is connected to the case. And an urging member (70) that covers the coupler so as to urge elastically in the direction toward.
In addition, the code | symbol in each said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  According to the first aspect of the present invention, a coupler to which an external connector is connected so as to supply current supplied from the power source to the brush is provided on the outer surface of the case. The urging member is configured to cover the coupler so as to urge the coupler in a direction toward the case.

  Thus, since the biasing member covers the coupler so as to bias it in the direction toward the case based on the elastic force, the coupler can be pressed against the case. Thereby, the relative displacement with respect to the case of a coupler can be suppressed. Therefore, when the motor operates with the coupler connected to the external connector, the rotor rotates and vibrations occur in these members due to continuous sliding contact between the brush and the commutator. Even if it is transmitted to the coupler, the vibration of the coupler connected to the external connector with respect to the motor can be suppressed. Thus, by suppressing the vibration of the coupler connected to the external connector, it is possible to suppress the generation of radiated sound from the coupler connected to the external connector. In particular, with a simple configuration in which the coupler is simply covered with an urging member that can be elastically deformed, generation of radiated sound can be suppressed while suppressing an increase in manufacturing cost.

  In the invention according to claim 2, the urging member is an annular member that can be elastically deformed, and is configured to cover a part of the coupler and the case in a ring shape from a direction orthogonal to the rotation axis of the rotor. As a result, it is possible to easily realize a configuration that suppresses the generation of radiated sound by a simple assembly process in which a part of the coupler and the case is covered with the urging member so that the urging member is fitted into the coupler and the case. Can do.

It is a side view showing the composition outline of the power seat device concerning a 1st embodiment of the present invention. It is a front view of the motor and reduction gear of FIG. It is a perspective view of the motor and reduction gear of FIG. It is a top view of the motor and reduction gear of FIG. It is a right view of the motor and reduction gear of FIG. It is a front view of the motor of FIG. It is a top view of the motor of FIG. It is a left view of the motor of FIG. It is an expanded sectional view which expands and shows the AA cross section of FIG.

[First Embodiment]
Hereinafter, an embodiment of a power seat device 10 according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an outline of the configuration of the power seat device according to the first embodiment of the present invention.
As shown in FIG. 1, a power seat device (hereinafter also referred to as a seat device) 10 according to the first embodiment includes a vehicle seat 11 including a seat cushion and a seat back, and the vehicle seat 11 is attached to a vehicle body. And a slide rail member 12 that is slidably supported. The vehicle seat 11 includes a seat cushion frame 11a that fixes the seat cushion to the slide rail member 12, and a seat that is tiltably attached to a rear portion of the seat cushion frame 11a and supports the seat back so as to be tiltable with respect to the seat cushion. And a back frame 11b. The slide rail member 12 is mainly composed of a pair of lower rails 12a that are fixed to the vehicle body and extend in the front-rear direction of the vehicle, and a pair of upper rails 12b that are slidably supported by the lower rails 12a. It has.

  The seat device 10 is configured to adjust the state of the vehicle seat 11 using the motor 20 as a drive source. As shown in FIGS. 1 to 5, the seat device 10 is transmitted from the motor 20 by being assembled to the motor 20 that is an adjustment unit that electrically adjusts the position of the vehicle seat 11 and the like. A gear box 80 for decelerating the rotation and an electronic control unit (ECU, not shown) for driving and controlling the motor are provided. The first embodiment shows an example in which the motor 20 is configured as an R height motor and is controlled by an electronic control unit so as to function to change the height of the rear portion of the seat cushion by its rotational drive. In addition to the R height motor, the motor 20 may be configured as a slide motor, a lycra motor, an F height motor, or the like. For example, when the motor 20 is configured as a slide motor, the vehicle seat 11 is slid with respect to the vehicle body by being controlled by an electronic control device and sliding the upper rail 12b with respect to the lower rail 12a by its rotational drive. To function. Further, when the motor 20 is configured as a lycra motor, the seat back is tilted with respect to the seat cushion by being controlled by an electronic control device and tilting the seat back frame 11b with respect to the seat cushion frame 11a by its rotational drive. To function. Further, when the motor 20 is configured as an F height motor, the motor 20 is controlled by an electronic control device and functions to change the height of the front portion of the seat cushion by its rotational driving.

  Next, the configuration of the motor 20 according to the present invention will be described in detail with reference to FIGS. The motor 20 is configured as a motor with a brush. As shown in FIGS. 6 to 9, the motor 20 includes a rotor 40 that rotates about a rotation axis along a predetermined direction (about the rotation axis L), a motor case 30 that houses the rotor 40, and a power source. A coupler 60 to which an external connector connected to is connected. Further, as shown in FIG. 9, a commutator (commutator) 45 for switching the direction of the current flowing in the coil included in the rotor 40 is provided on the outer peripheral surface 40 a of the rotor 40. A brush 50 that is in sliding contact with the commutator 45 is held by the motor case 30. In the first embodiment, an urging member 70 that covers the coupler 60 and the motor case 30 from the outside is provided in order to suppress the radiated sound generated from the coupler 60.

Hereafter, each element which comprises the motor 20 is explained in full detail.
As shown in FIG. 9, the rotor 40 includes a shaft 41 that serves as a rotating shaft of the motor 20, a rotor core (not shown) that is fitted and fixed to the shaft 41 and provided with a plurality of electromagnetic coils, and a shaft 41. And a holding portion 43 that holds and fixes the commutator 45. The shaft 41 is rotatably supported at one end and in the vicinity of the center by a bearing disposed in the motor case 30 (for example, a bearing formed at both ends in the longitudinal direction of the motor case 30 formed in a longitudinal cylindrical shape). ing. The coil of the rotor core is provided so as to face a magnet wound around the armature and fixed to the inner wall of the motor case 30. The commutator 45 is formed of a curved plate-like conductive member, and is arranged in a plurality (the same number as the coil) in the circumferential direction along the outer surface of the holding portion 43 formed in a cylindrical shape. Moreover, the commutator 45 is arrange | positioned at the holding | maintenance part 43 so that the brush 50 mentioned later may be in sliding contact. In the rotor 40, the current supplied from the brush 50 flows in sequence to each coil via the commutator 45, and the magnetic field generated in each coil rotates in the rotational direction with respect to the magnetic force of the magnet fixed to the inner wall of the motor case 30. It rotates by working.

  Further, as shown in FIGS. 6 and 7, the rotor 40 is provided with a gear 47 at a portion different from the portion accommodated in the motor case 30 in the shaft 41. The gear 47 is configured as a worm gear, for example, and meshes with a worm wheel (not shown) provided in the gear box 80, and the driving force output from the motor 20 is input to the gear box 80 at a predetermined reduction ratio. Transmit to the shaft.

  As shown in FIG. 9, the motor case (case) 30 supports the brush 50 by being housed in the outer case 32 formed in a substantially rectangular tube shape with rounded corners on the side surface and inside the outer case 32. And a brush holder 34 to be fixed. The outer case 32 and the brush holder 34 are formed from a synthetic resin material such as ABS resin. The brush holder 34 has a through hole along the longitudinal direction, and is disposed so as to surround one end side of the rotor 40 (the side on which the rotor core and the holding portion 43 are provided). The brush 50 is supported and fixed by the brush holder 34 so as to protrude inward from the side opposite to the side where the coupler 60 described later is formed. The brush 50 is connected to a terminal 56 formed of a conductive member via a wire 54 formed of the conductive member.

  A coupler 60 that functions as a connector on the motor 20 side to which an external connector (not shown) is connected is provided on the outer surface 30a of the motor case 30. Specifically, the coupler 60 is configured by a substantially square cylindrical outer wall 62 whose one opening is closed, and is integrated with the brush holder 34 so as to protrude outward from one side of the outer case 32 of the motor case 30. Is formed. Further, a lead-out port (not shown) of the terminal 56 is formed on the bottom surface (closed opening portion) of the coupler 60, and each terminal 56 passes through this lead-out port and is led out into the coupler 60 as each end portion 56a. Has been. In addition, two guides 64 projecting inward are formed on the outer peripheral wall 62 of the coupler 60 so as to guide the external connector while supporting the external connector when the external connector is inserted. Further, the coupler 60 is disposed at a position overlapping the motor case 30 in a direction perpendicular to the rotation axis L (see FIG. 9) of the rotor 40. That is, the coupler 60 is disposed along the outer peripheral surface of the motor case 30. With such a configuration, the coupler 60 is configured to supply current supplied from the external connector to the brush 50 via the terminal 56 and the wire 54 when the external connector to which the power supply is connected is connected. .

  The biasing member 70 is an annular member (band plate-shaped ring member) that can be elastically deformed. The urging member 70 is made of, for example, a resin sheet, a rubber sheet, a cloth, or the like. The urging member 70 covers the coupler 60 so as to elastically urge the coupler 60 in the direction toward the motor case 30. Specifically, the outer circumference of the coupler 60 and the motor case 30 (specifically, the outer circumference surrounding the coupler 60 and the motor case 30 in the cross section shown in FIG. 9) is formed to be shorter than the outer circumference. The urging member 70 is configured to be fitted to the coupler 60 and the motor case 30 so as to be stretched so that the ring shape becomes large. With such a configuration, the urging member 70 annularly covers the coupler 60 and the motor case 30 from a direction (radial direction of the rotor 40) perpendicular to the rotation axis L of the rotor 40 (see FIG. 9). Further, the urging member 70 is configured to overlap the coupler 60 in a direction orthogonal to the rotation axis L. That is, the biasing member 70 has a length that covers substantially the entire outer peripheral wall 62 of the coupler 60 in the direction along the rotation axis L.

  Next, the gear box 80 will be described with reference to FIGS. The gear box 80 is made of a synthetic resin material such as polybutylene terephthalate (PBT), for example, and includes a wheel case 81 and a wheel cover 83 as shown in FIG. The wheel case 81 accommodates a worm wheel that is coaxially assembled to the input shaft for the motor 20 and that is always meshed with the gear 47 of the motor 20. The wheel case 81 is formed with a gear cover 81 a that covers the gear 47 of the motor 20 and a fastening portion 81 b that is fastened to the motor case 30. The fastening portion 81b covers one end of the motor case 30 (the end on the side where the gear 47 is disposed) and faces the fastening plate 30b of the motor case 30, and is fastened by the fastening member 90 (for example, a screw). Fixed to.

  The wheel cover 83 is assembled to the wheel case 81 by heat caulking or the like so as to cover the worm wheel from the side opposite to the wheel case 81. The wheel cover 83 is made of, for example, a metal material such as a SAPH steel plate such as SAPH440, and a through hole capable of supporting the output side gear 87 is formed at the center. The worm wheel to which the driving force is transmitted from the motor 20 outputs rotation by an output side gear 87 formed integrally with the output shaft 85 via, for example, a pinion gear.

  The seat device 10 that electrically adjusts the position of the vehicle seat 11 can be configured by assembling the gear box 80 with the motor 20 and the like assembled to the seat cushion frame 11a and the like as described above. In the seat device 10, the position of the vehicle seat 11 is adjusted using the rotation transmitted through the output shaft 85 of the gear box 80 according to the driving of the motor 20. For example, when the motor 20 is configured as an R height motor, the height of the rear portion of the seat cushion is changed by the rotational drive.

Next, the operation of the motor 20 will be described with reference to the drawings.
When a control signal for driving and controlling the motor is output by the electronic control unit in a state where the external connector connected to the power source is connected to the coupler 60 of the motor 20, a current is supplied from the external connector to each terminal 56. Then, current is supplied from the terminal 56 to the brush 50 via the wire 54. Further, current is supplied from the brush 50 to the commutator 45 that sequentially contacts the brush 50, and further, current is supplied to the coil of the rotor 40. As a result, a magnetic flux is generated around the rotor 40, and a rotational force that rotates the rotor 40 with respect to the magnetic force of the magnet fixed to the inner wall of the motor case 30 is generated. Further, when the commutator 45 is rotated along with the rotation of the rotor 40, the direction of the current flowing through the coil is sequentially changed in the reverse direction every time the brush 50 comes into contact due to the rectifying action of the commutator 45.

  When the rotor 40 rotates during the operation of the motor 20, the commutator 45 is in sliding contact with the brush 50 in a direction perpendicular to the rotation axis L of the rotor 40. That is, a frictional force is generated in the commutator 45 and the brush 50 in a direction orthogonal to the rotation axis L of the rotor 40. Specifically, each brush 50 is configured to contact the commutator 45 from obliquely below, as shown in FIG. Here, the direction in which the rotor 40 and the coupler 60 face each other is the vertical direction, the side on which the coupler 60 is located is the upper side, and the opposite side is the lower side. With such a configuration, the commutator 45 and the brush 50 vibrate with the direction orthogonal to the rotation axis L (for example, the vertical direction) as the amplitude direction. When such vibration occurs, the vibration is transmitted to the coupler 60 via the brush holder 34 or the like.

  In the first embodiment, the urging member 70 is assembled to the motor 20 to suppress the generation of radiated sound from the coupler 60. Specifically, the biasing member 70 covers the coupler 60 against the motor case 30 so as to bias the coupler 60 in the direction toward the motor case 30 based on the elastic force. Thereby, the displacement (rattle etc.) with respect to the motor case 30 of the coupler 60 in the direction (for example, up-down direction) orthogonal to the rotation axis L of the rotor 40 can be suppressed. In particular, since the biasing member 70 presses the coupler 60 against the motor case 30 from the direction orthogonal to the rotation axis L of the rotor 40, the motor case of the coupler 60 based on vibration with the direction orthogonal to the rotation axis L as the amplitude direction. The displacement with respect to 30 can be effectively suppressed. As a result, continuous sliding contact between the brush 50 and the commutator 45 in the direction orthogonal to the rotation axis L generates vibrations in these members with the direction orthogonal to the rotation axis L as the amplitude direction. When transmitted to the coupler 60 through the case 30, vibration of the coupler 60 connected to the external connector can be suppressed.

  In the seat device 10 to which the motor 20 is applied, the magnitude of high-frequency sound generated when adjusting the height of the rear portion of the seat cushion was measured. For example, when the position of the rear portion of the seat cushion is raised, in the configuration in which the urging member 70 is not provided, the 6.3 kHz sound that is a high frequency band is detected at 33 dB (A), whereas the urging member In the configuration of the first embodiment in which 70 is provided, a sound of 6.3 kHz is detected at 28 dB (A). Further, when the position of the rear portion of the seat cushion is lowered by setting the rotation direction of the rotor 40 in the direction opposite to that when the rotor 40 is raised, the configuration in which the urging member 70 is not provided generates a sound of 6.3 kHz that is a high frequency band. In contrast to the detection at 28 dB (A), in the configuration of the first embodiment in which the urging member 70 is provided, a sound of 6.3 kHz is detected at 24 dB (A). As described above, by using the urging member 70 and covering the coupler 60 so as to urge the coupler 60 in the direction toward the motor case 30 based on the elastic force, it is uncomfortable when adjusting the height of the seat cushion. Noise (high-frequency sound) can be reduced.

  As described above, in the motor 20 included in the power seat device 10 according to the first embodiment, the coupler 60 to which the external connector is connected so as to supply the current supplied from the power source to the brush 50 is the rotation axis L. It is the structure provided in the outer surface 30a of the motor case 30 so that it may overlap with the motor case 30 in the direction orthogonal to. The biasing member 70 is configured to cover the coupler 60 so as to elastically bias the coupler 60 in the direction toward the motor case 30.

  Thus, the biasing member 70 covers the coupler 60 so as to bias the coupler 60 in the direction toward the motor case 30 based on the elastic force, so that the coupler 60 can be pressed against the motor case 30. Thereby, the relative displacement with respect to the motor case 30 of the coupler 60 can be suppressed. Therefore, when the motor 20 operates with the coupler 60 connected to the external connector, the rotor 40 rotates and vibrations are generated in these members due to continuous sliding contact between the brush 50 and the commutator 45, Even when the vibration is transmitted to the coupler 60 through the motor case 30, the vibration of the coupler 60 connected to the external connector with respect to the motor 20 can be suppressed. Thus, by suppressing the vibration of the coupler 60 connected to the external connector, it is possible to suppress the generation of radiated sound of the coupler 60 connected to the external connector. In particular, the simple configuration in which the coupler 60 is simply covered with the urging member 70 that can be elastically deformed as described above can suppress generation of radiated sound while suppressing an increase in manufacturing cost.

  The urging member 70 is an annular member that can be elastically deformed, and is configured to cover a part of the coupler 60 and the motor case 30 in a ring shape from a direction orthogonal to the rotation axis L. Thereby, the structure which suppresses generation | occurrence | production of a radiated sound by the simple assembly process which only covers the coupler 60 and the motor case 30 with the biasing member 70 so that the coupler 60 and the motor case 30 may be inserted in the biasing member 70. It can be realized easily.

In addition, this invention is not limited to the said 1st Embodiment, You may actualize as follows, and even in that case, the effect | action and effect equivalent to the said 1st Embodiment are acquired.
(1) The urging member 70 is not limited to a configuration in which the urging member 70 is fitted and attached to the coupler 60 and the motor case 30 so as to be stretched so that the ring shape becomes large, but the coupler 60 is elastic in a direction toward the motor case 30. For example, the structure may be such that the coupler 60 and the motor case 30 are wound and attached via an adhesive or the like so as to be biased.
(2) The urging member 70 is not limited to the configuration in which the coupler 60 and the motor case 30 are annularly covered, but may be configured to cover a part of the outer periphery of the coupler 60 and the motor case 30. For example, the biasing member 70 may be attached to a part of the outer periphery of the coupler 60 and the motor case 30 via an adhesive or the like. Alternatively, the coupler 60 and the motor case 30 may be covered in a stretched state, and both ends of the urging member 70 may be fixed to the motor case 30.
(3) The coupler 60 and the motor case 30 (more specifically, the brush holder 34) are not limited to be integrally formed, and may be configured separately.
(4) The biasing member 70 is not limited to a length that covers substantially the entire outer peripheral wall 62 of the coupler 60, and may be a length that covers a part of the outer peripheral wall 62. In addition, the configuration is not limited to the configuration in which the coupler 60 is covered by one urging member 70, but the configuration in which different portions of the coupler 60 are covered by the plurality of urging members 70, or the coupler 60 is covered so that the plurality of urging members 70 are stacked. It may be a configuration.

DESCRIPTION OF SYMBOLS 10 ... Power seat apparatus 20 ... Motor 30 ... Motor case (case)
40 ... Rotor 45 ... Commutator 50 ... Brush 60 ... Coupler 70 ... Biasing member 80 ... Gear box

Claims (2)

A power seat device that adjusts the state of a vehicle seat using a motor as a drive source,
The motor is
A commutator formed on the outer peripheral surface of the rotor;
A brush in sliding contact with the commutator;
A case for housing the rotor and holding the brush;
A coupler provided on the outer surface of the case so that an external connector is connected and current supplied from the external connector connected to a power source is supplied to the brush;
A biasing member that covers the coupler so as to elastically bias the coupler toward the case;
A power seat device comprising:   2. The power seat according to claim 1, wherein the urging member is an annular member that is elastically deformable, and covers the coupler and a part of the case in a ring shape from a direction orthogonal to a rotation axis of the rotor. apparatus.

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