JP2010069900A - Seat belt retractor and seat belt apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the drip-proofness of a motor and an electronic control device while suppressing an increase in size as much as possible and reducing assembly man-hours to a vehicle body. <P>SOLUTION: A motor for rotating a spool for winding a seat belt and an ECU therefor are united to compose a motor/ECU all-in-one unit 23. The motor/ECU all-in-one unit 23 is supported on a frame 8 just below the spool. In this case, the motor and the ECU 25 are accommodated in a unit case 24, and a case body 24a of the unit case 24 is flatly supported on a unit stay by a fixing tool 30 penetrating a supporting hole formed in the case body 24a. Thus, any supporting hole opened above a cover 24b of the unit case 24 is not formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to a technical field of a seat belt retractor that winds and pulls out a seat belt by a motor, and a technical field of a seat belt device for a vehicle including the seat belt retractor, and further includes a pretensioner. It belongs to the technical field of seat belt devices.

  2. Description of the Related Art Conventionally, various types of seat belt retractors that include a pretensioner and wind up and pull out a seat belt by rotating a spool with a motor have been proposed for seat belt devices installed in vehicles such as automobiles (for example, , See Patent Document 1).

  The pretensioner is required to operate at an early stage of emergency when a deceleration larger than a normal deceleration is applied to the vehicle at the time of a vehicle collision or the like, and the seat belt needs to be wound up by a predetermined amount by the operation of the pretensioner. Therefore, in the seat belt retractor described in Patent Document 1, the pretensioner is provided so that the connector portion of the gas generator is positioned at the lower end of the frame of the seat belt retractor, and the operation amount of the pretensioner is ensured. Yes. A motor for rotating the spool is disposed below the connector portion.

However, when the pretensioner is extended to the lower end of the frame as in the seat belt retractor described in Patent Document 1, there is no space for mounting the motor on the frame. For this reason, it is difficult to support the motor directly on the frame. Therefore, in the seat belt retractor described in Patent Document 1, a support member is attached to the lower end portion of the frame, and both ends of the motor are supported by the support member.
JP 2004-189024 A.

  However, if the motor is supported by the support member attached to the frame as described above, there is a problem that the seat belt retractor protrudes downward and becomes larger by that amount. Moreover, in the seat belt retractor described in Patent Document 1, the motor itself is simply supported by the support member. For this reason, there is a possibility that a liquid such as water may be directly applied to the motor, and there is a problem that the drip-proof property is not good.

  In addition, an electronic control unit (ECU) for driving and controlling the motor must be provided at another location of the vehicle body. For this reason, there is a problem that the wiring work between the motor and the ECU becomes complicated and the number of steps for assembling the seat belt retractor to the vehicle body increases. Furthermore, the wiring between the motor and the ECU is directly exposed, and there is a problem that electromagnetic noise may be emitted from this wiring.

  The present invention has been made in view of such circumstances, and the object thereof is to suppress the increase in size as much as possible and to reduce the number of steps for assembling the vehicle and the drip-proofing of the motor and the electronic control device. It is an object to provide a seat belt retractor capable of improving the performance and a seat belt device including the same.

In order to solve the above-described problems, a seat belt retractor according to the present invention includes a spool that winds up a seat belt, a frame that rotatably supports the spool, and a spool that rotates in the seat belt retracting direction and the pulling out direction. A seat belt retractor comprising at least a motor and a power transmission unit for transmitting rotation of the motor to the spool, comprising: an electronic control device for controlling the motor, wherein the motor and the electronic control device are integrated into a motor / electronic device. A case that is configured as a control device unit, the motor / electronic control device unit includes a unit case, the motor and the electronic control device are accommodated in the unit case, and the unit case is open at the top A cover for closing the main body and the upper opening of the case main body With the door, said unit case is characterized in that it is supported by the frame in the unit stay.

  Further, the seat belt retractor of the present invention has an annular flange portion formed so that the cover protrudes downward on the entire circumference of the outer peripheral edge thereof, and the cover is opened at the upper end portion of the case body. And the outer periphery of the upper end of the case body is covered with the flange portion of the cover over the entire periphery.

Furthermore, the seat belt retractor of the present invention is characterized in that the case main body and the cover are both formed of a heat conductive material having high heat conductivity.
Furthermore, the seat belt retractor of the present invention is characterized in that the electronic control device has a connector that can be connected to an external device, and the connector has its connection port set downward.

  Furthermore, the seat belt retractor of the present invention includes a pretensioner that rotates the spool in the seat belt winding direction by gas generated by the gas generator in an emergency, and the gas generator of the pretensioner is disposed above the spool. And is supported by the frame.

  Furthermore, the seat belt device of the present invention includes a seat belt retractor that winds up the seat belt, a tongue that is slidably supported by the seat belt, and a buckle that is provided on the vehicle body and that is detachably locked to the tongue. And the seat belt retractor is any one of the seat belt retractors of the present invention described above.

  According to the seat belt retractor of the present invention having such a configuration, since the motor and the electronic control unit are integrally configured as a motor / electronic control unit, the motor / electronic control unit unit is configured as a frame of the seat belt retractor. You just need to attach it to. Therefore, the seat belt retractor can be easily assembled to the vehicle body, and the number of assembling steps can be reduced.

  Furthermore, the motor and electronic control unit can be connected in advance to the motor and the electronic control unit by wiring, and this wiring can be arranged in the unit case. This eliminates the need for wiring work when the seat belt retractor is attached to the vehicle body, simplifying the work of installing the seat belt retractor, and leaking noise generated from the wiring to the outside without providing a dedicated shield member. Can be suppressed. As a result, the noise resistance of the seat belt retractor can be improved and the cost can be reduced.

Further, since the case main body of the motor / electronic control unit is supported by the unit stay by the fixing tool penetrating the support hole formed in the case main body, there is no support hole in the cover of the motor / electronic control unit. There is no need to provide it. Thereby, it is possible to effectively prevent liquid such as water from the outside from being applied to the motor, the electronic control device, and the wiring between the motor and the electronic control device. Therefore, the drip-proof property of the motor / electronic control unit can be improved.

  Further, the cover is placed on the upper end portion of the case body so as to close the opening thereof, and the outer periphery of the upper end portion of the case body is covered with the flange portion of the cover over the entire circumference, so that the motor / electronic control unit unit The drip-proof property can be further effectively improved. Furthermore, the drip-proof property of the motor / electronic control unit can be further effectively improved by setting the connection port of the connector of the electronic control unit downward.

  Furthermore, since the unit case of the motor / electronic control unit is made of a heat conductive material having good high thermal conductivity, even if the motor and the electronic control unit are housed integrally in the unit case, The generated heat can be efficiently radiated to the outside through the unit case having good thermal conductivity. Therefore, the temperature rise inside the unit case can be suppressed, and the influence of heat on the motor and the electronic control device can be prevented.

  Further, since the gas generator of the pretensioner is disposed above the spool, it is possible to prevent the pretensioner from protruding greatly downward as in the conventional seat belt retractor described in Patent Document 1 and the like described above. Therefore, a relatively large space can be formed below the spool of the seat belt retractor, and this large space can be used as an installation space for the motor and the electronic control device. As a result, the motor and the electronic control unit can be more effectively integrated into a single unit while effectively suppressing an increase in the size of the seat belt retractor, and can be easily installed below the spool.

  Furthermore, according to the seatbelt device provided with the seatbelt retractor of the present invention, the seatbelt retractor including the motor can be formed more compactly, so that the installation space of the seatbelt retractor on the vehicle body can be reduced. Therefore, the degree of freedom of installation of the seat belt retractor on the vehicle body can be increased. Thereby, since the seat belt retractor can be flexibly attached to the vehicle body, the convenience of the seat belt device can be improved.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a view schematically showing a seat belt apparatus provided with an example of an embodiment of a seat belt retractor according to the present invention.

As shown in FIG. 1, the seat belt device 1 of this example is basically the same as a three-point seat belt device that winds and pulls out a seat belt by a conventionally known motor. In the figure, 1 is a seat belt device, 2 is a vehicle seat, 3 is a seat belt retractor disposed in the vicinity of the vehicle seat 2, 4 is retractably wound around the seat belt retractor 4, and a belt anchor 4 a at the tip is A seat belt 5 fixed to the floor of the vehicle body or the vehicle seat 2 is a guide anchor 5 that guides the seat belt 4 pulled out from the seat belt retractor 3 toward the occupant's shoulder, and the seat guided from the guide anchor 5. A tongue 6 slidably supported on the belt 4 and a buckle 7 fixed to the floor of the vehicle body or a vehicle seat and detachably inserted into the tongue 6.
The seatbelt 4 mounting operation and mounting release operation in the seatbelt apparatus 1 are the same as those of a conventionally known seatbelt apparatus.

The seat belt retractor 3 of this example includes a pretensioner and a motor. The pretensioner operates in the same manner as a conventionally known pretensioner when a deceleration much larger than the deceleration during normal driving is applied to the vehicle, such as in the case of a vehicle collision, and the spool of the seat belt retractor 3 is seated. The seat belt 4 is rotated in the belt winding direction to increase the restraining force of the predetermined both-winding occupant. In addition, the motor, like the motor provided in the conventionally known seat belt retractor 3, performs the winding and withdrawal of the seat belt by rotating the spool.

FIGS. 2 (a) to (c), FIGS. 3 (a) and 3 (b) are views showing a seat belt retractor of this example, and FIGS. 4 (a) to 4 (c) are views showing a pretensioner.
As shown in FIGS. 2 (a) to 2 (c), FIGS. 3 (a) and 3 (b), the frame 8 of the seat belt retractor 3 is attached to the plate-like stay 8a attached to the vehicle body and the stay 8a. And a U-shaped base portion 8b for supporting each component of the seat belt retractor 3.

  The pretensioner 9 is attached to one side wall 8 c of the base portion 8 b of the frame 8. This pretensioner 9 is a pretensioner according to Japanese Patent Application No. 2008-199753 by the present applicant. Therefore, the pretensioner 9 is described in detail in the specification and drawings of Japanese Patent Application No. 2008-199975, and will be briefly described here.

  As shown in FIGS. 4A to 4C, the pretensioner 9 has a pipe 10, and a distal end portion 10 a of the pipe 10 is closed with a closing plug 11. The distal end portion 10a and the closing plug 11 of these pipes 10 are fixed to a pipe mounting portion 8d provided on one side wall 8c of the base portion 8b by a fastener 12 such as a bolt, and are concentric with the rotating shaft 13 ( It is located slightly below (not shown). The rotating shaft 13 can rotate integrally with the spool.

  In the pipe 10, a plurality of balls 14a made of metal such as iron or aluminum and a plurality of force transmission members 14 including pistons (not shown) that receive the gas pressure to press the balls 14a are movably arranged in contact with each other. It is installed. A pipe-shaped pressure vessel 15 is connected to the base end portion 10 b of the pipe 10. The pressure vessel 15 is provided with a gas generator 16.

  The operation of the pretensioner 9 is basically until the spool of the seat belt retractor 3 is rotated in the seat belt winding direction by operating in an emergency in which a large deceleration is applied to the vehicle such as a vehicle collision. The operation of the conventional pretensioner using a plurality of balls is the same.

  That is, as shown in FIG. 4A, when the pretensioner 9 is not in operation, the first first ball 14a is held in contact with the lever 17, and the subsequent balls 14a are sequentially adjacent to each other. The balls 14a to be in contact with each other are in contact with each other. At this time, the gas generator 16 does not generate gas, and the ball 14 a does not substantially press the lever 17. Therefore, the ring gear 18 is held in a state in which the inner teeth 18 a do not mesh with the outer teeth 19 a of the pinion 19.

  In the above-described emergency, the gas generator 16 is activated to generate gas, and a large pressing force is applied to the ball 14a by the gas pressure of the generated gas. Then, the ring gear 18 moves to the right in FIG. 4A by the pressing force via the first ball 14a and rotates counterclockwise. 4B, the inner teeth 18a of the ring gear 18 mesh with the outer teeth 19a of the pinion 19, and the pinion 19 starts to rotate in the same direction as the ring gear 18. Thereby, the rotating shaft 13, that is, the spool, starts to rotate in the seat belt winding direction, and the seat belt 4 attached to the occupant starts to wind.

When the first ball 14a is accommodated between the levers 17 and 20, and the next second ball 14a abuts on the lever 20 adjacent to the lever 17 in the clockwise direction, the second ball 14a passes through the second ball 14a. Both the ring gear 18 and the pinion 19 are further rotated counterclockwise by the pressing force applied to the lever 20. At this time, the pressing force applied to the lever 17 by the first ball 14a substantially disappears. Two second and third balls 14a are accommodated between the lever 20 and the next lever 20 adjacent to the lever 20 in the clockwise direction, and the fourth ball 14a next to the third ball 14a is accommodated. When coming into contact with the next lever 20, both the ring gear 18 and the pinion 19 are further rotated counterclockwise by the pressing force applied to the next lever 20 via the fourth ball 14a. At this time, the pressing force applied to the lever 20 by the second and third balls 14a has substantially disappeared.

The operation of the pretensioner 9 so far is substantially the same as the operation of the conventional pretensioner. In the conventional pretensioner, the ball from which the pressing force to the lever has substantially disappeared escapes from the notch of the pipe and is separated from the lever, and is stored in a ball storage chamber provided in the pretensioner. On the other hand, in the pretensioner 9 of this example, the ball storage chamber is not provided, and the first to third balls 14 a in which the pressing force to the levers 17 and 20 has substantially disappeared are arc-shaped of the closing plug 11. The guide surface 11a is guided to escape from the notch 10c of the pipe 10 and moves to an arcuate moving passage 22 formed between the case 9a and a power transmission retainer 21b of the power transmission unit 21 described later. .

Both the ring gear 18 and the pinion 19 continue to rotate counterclockwise by the pressing force applied to the adjacent levers 20 in the clockwise direction by the fourth and subsequent balls 14a. As shown in FIG. 4 (c), the ball 14 a that has moved to the arc-shaped moving passage 22 and whose pressing force has substantially disappeared is moved along with the rotation of the ring gear 18 by the levers 17 and 20 of the ring gear 18. Move along. When the first ball 14a comes into contact with the ball stopper portion 10d of the pipe 10, the first ball 14a stops, so that the rotation of the ring gear 18 stops. Thereby, the rotation of the pinion 19 is also stopped, and the winding of the seat belt 4 of the spool is finished. By winding the seat belt 4 by the pretensioner 9, the restraining force of the occupant by the seat belt 4 is increased.

  By stopping the rotation of the ring gear 18, the movement of the second and subsequent balls 14a is also stopped. At this time, the gas pressure of the gas generated in the pipe 10 is low. Thus, in a state where each ball 14a is stopped, most of each ball 14a is located in the arc-shaped moving passage 22 between the case 9a and the power transmission retainer 21b. In other words, when the operation of the pretensioner 9 is completed, most of the balls 14a are accommodated in the moving passage 22 (that is, the case 9a of the pretensioner 9).

  By the way, in the pretensioner 9 of this example, the piping (piping) of the pipe 10 is set as follows. That is, as shown in FIGS. 4 (a) to 4 (c), with the pretensioner 9 attached to the vehicle body, the pipe 10 has its tip end portion 10a at the lowest position and linearly upward from the tip end portion 10a. It is extended in the shape.

Further, as shown in FIG. 2 (c), the pipe 10 is bent at a substantially upper end of the base portion 8b of the frame 8 at a substantially right angle to the opposite side of the stay 8a, so as to be orthogonal or substantially orthogonal to the center axis α of the spool. It is leveled and extends straight. Further, as shown in FIG. 2A, the pipe 10 is bent at a substantially right angle to the opposite side of the base portion 8b in the direction of the center axis α of the spool near the end of the base portion 8b opposite to the stay 8a. Is made parallel to or substantially parallel to the central axis α of the first and substantially horizontal and extends linearly. Further, as shown in FIG. 2 (c), the pipe 10 is bent at a substantially right angle toward the stay 8a in the vicinity of the opposite end of the base portion 8b in the direction of the center axis α of the spool, and is orthogonal to the center axis α of the spool. Alternatively, it extends substantially linearly and is inclined slightly upward with respect to the horizontal direction. Therefore, as shown in FIGS. 2B and 3A, the pressure vessel 15 and the gas generator 16 are disposed slightly upward above the base portion 8b. In this state of the pipe 10, the pressure vessel 15 and the gas generator 16 are disposed above the spool and face the vehicle interior side (upper side in FIG. 2 (c) and left side in FIG. 3 (a)). .

  As shown in FIGS. 2A and 2B and FIGS. 3A and 3B, a motor / ECU integrated unit 23 is disposed immediately below the pretensioner 9. As shown in FIG. 5, the motor / ECU integrated unit 23 includes a unit case 24, an ECU 25, a motor 26, and a motor stopper 27.

As shown in FIGS. 5 and 6A to 6C, the unit case 24 includes a case body 24a and a cover 24b. Both the case body 24a and the cover 24b are made of a conventionally known heat conductive material such as a metal having good high heat conductivity. As shown in FIG. 6D, the case main body 24a is formed in a container shape opened upward. A motor 26 is attached to the case body 24a with an adhesive. In that case, a conventionally known heat conductive adhesive having good heat conductivity is used as the adhesive. The motor 26 is positioned in the axial direction are held between the side wall 24a ₁ and the motor stopper 27 of the casing body 24a.

The cover 24b has an annular flange portion 24b ₁ formed so as to protrude downward on the entire outer periphery of the cover 24b. The flange portion 24b ₁ is provided with a predetermined number (four in the illustrated example) of mounting holes 24b ₂ . The cover 24b is placed on the upper end of the case body 24a so as to close the opening. At this time, the outer periphery of the upper end portion of the case body 24a is covered by the flange portion 24b ₁ of the cover 24b around the entire circumference.

The ECU 25 is disposed above the motor 26. The ECU 25 includes an ECU board 25a and an ECU connector 25b that is electrically connected to the ECU board 25a and can be connected to an external device. The ECU 25 is mounted in the unit case 24 such that the outer peripheral edge of the ECU board 25a is sandwiched between the upper edge of the case body 24a and the cover 24b and the connection port of the ECU connector 25b faces downward. . In this case, a portion facing the ECU connector 25b at the bottom of the case body 24a is opened downward, and the ECU connector 25b can be electrically connected to an external device through this opening. Further, the motor 26 and the ECU board 25a are electrically connected by a wiring 28. Then, by inserting a screw or bolt to the mounting holes 24b ₂ of the cover 24b, provided on the side wall of the case body 24a and by screwing the screw hole 24a ₂ corresponding to these mounting holes 24b _2, the cover 24b is It is attached to the case body 24a.

Thus, the motor / ECU integrated unit 23 in which the ECU 25 and the motor 26 are integrally accommodated in the unit case 24 is configured. In that case, with no through-hole is provided at all in addition to the mounting holes 24b ₂ provided in the flange portion 24b ₁ to the cover 24b, the outer periphery of the upper end portion of the case body 24a by the flange portion 24b ₁ of the annular throughout the entire periphery Since it is covered, the motor / ECU integrated unit 23 has a structure that does not open upward at all. Further, a motor rotation shaft 26 a of the motor 26 protrudes from one end side of the motor / ECU integrated unit 23.

As shown in FIGS. 2A and 2B, a power transmission unit 21 is disposed on the opposite side of the pretensioner 9 from the frame 8. As shown in FIG. 7A, the power transmission unit 21 includes a gear power transmission mechanism 21a and a power transmission retainer 21b that connect the motor rotation shaft 26a and the rotation shaft 13 that can rotate integrally with the spool. Yes. As shown in FIG. 7B, the power transmission retainer 21b has a gear housing recess 21b ₁ on one surface side, and the gear power transmission mechanism 21a is housed in the gear housing recess 21b ₁ . The gear power transmission mechanism 21a transmits the rotation of the motor 26 at a reduced speed from the motor rotation shaft 26a to the rotation shaft 13. Therefore, the spool is rotated in both the seat belt retracting direction and the seat belt withdrawing direction by the rotation of the motor 26. In that case, the rotation of the motor 26 is controlled by the ECU 25. Further, as shown in FIG. 7 (c), the arc-shaped moving passage 22 of the ball 14a of the pretensioner 9 is formed on the other surface side (the side facing the pretensioner 9) of the power transmission retainer 21b. A passage groove 22a is formed. The power transmission retainer 21 b is integrally attached to one side wall 8 c of the base portion 8 b of the frame 8 together with the case 9 a of the pretensioner 9. Therefore, in the seat belt retractor 3 of this example, the power transmission retainer 21 b is also used as a cover for the case 9 a of the pretensioner 9.

As shown in FIG. 2A, the protruding end side of the motor rotating shaft 26a of the motor / ECU integrated unit 23 is fixedly supported by the power transmission retainer 21b, and the substantially central portion of the motor / ECU integrated unit 23 is the unit. It is supported on the base portion 8 b of the frame 8 through a stay 29. As shown in FIG. 5, the unit stay 29 is formed in a simple L-shape and has a flat unit support part 29a and a frame attachment part 29b. Flat supported portion 24a ₃ of the casing body 24a by the unit supporting portion 29a (in plane contact) plane to be supported. Then, via the supported portion 24a ₃ and the motor stopper 27 and the unit supporting portion 29a of the case body 24a of the flat shape as shown in FIG. 6 (d), the motor stopper 2
7. The motor / ECU integrated unit 23 is integrally fixed by fastening together with a fixing tool 30 such as a bolt that penetrates the support holes formed in the unit support portion 29a and the case main body 24a. Supported by Further, the frame attachment portion 29b is attached to the base portion 8b with a fixing tool such as a bolt. As a result, the motor / ECU integrated unit 23 is supported by the unit stay 29 in a planar shape just below the center of gravity.

  According to the seatbelt retractor 3 of this example configured as described above, the pretensioner 9 is arranged so that the distal end portion 10a of the pipe 10 is positioned slightly below the spool and the proximal end of the pipe 10 on the gas generator 16 side. Since the portion 8b is provided so as to be at the upper end position of the frame 9, it is possible to prevent the pretensioner 9 from protruding greatly downward as in the conventional seat belt retractor described in Patent Document 1 and the like described above. Therefore, a relatively large space can be formed below the spool of the seat belt retractor 3, and this large space can be used as an installation space for the ECU 25 and the motor 26. Accordingly, the ECU 25 and the motor 26 can be installed below the spool while effectively suppressing the increase in size of the seat belt retractor 3.

  In addition, since the ECU 25 and the motor 26 can be installed below the spool in this way, the motor / ECU integrated unit 23 can be configured by integrating the ECU 25 and the motor 26. As a result, it is only necessary to attach the motor / ECU integrated unit 23 to the frame 8 of the seat belt retractor 3, so that the seat belt retractor 3 can be easily assembled to the vehicle body and the number of assembling steps can be reduced. .

Further, since the motor stopper 27 for positioning the motor 26 in the axial direction and the unit support portion 29a of the unit stay 29 are integrally fixed together by way of the case body 24a, the number of parts can be reduced and the motor The structure of the ECU integrated unit 23 can be simplified. In addition, the motor / ECU integrated unit 23 can be stably supported by supporting the motor / ECU integrated unit 23 in a plane by the unit support portion 29a. Therefore, the external force resistance and vibration resistance of the support of the motor / ECU integrated unit 23 can be improved. In particular, since the motor / ECU integrated unit 23 is supported by the unit stay 29 just below the center of gravity, the motor / ECU integrated unit 23 can be supported more stably.
Furthermore, since the power transmission retainer 21b is also used as a cover for the case 9a of the pretensioner 9, a dedicated case 9a cover can be dispensed with. Thereby, the number of parts can be further reduced and the number of assembling steps of the seat belt retractor 3 can be reduced.

  Further, since the unit case 24 of the motor / ECU integrated unit 23 is made of a heat conductive material having good heat conductivity, even if the ECU 25 and the motor 26 are accommodated integrally in the unit case 24, the motor The heat generated from 26 can be efficiently radiated to the outside through the unit case 24 having good thermal conductivity. Therefore, the temperature rise inside the unit case 24 can be suppressed, and the influence of heat on the ECU 25 and the motor 26 can be prevented.

  Furthermore, the ECU 25 and the motor 26 can be connected in advance by the wiring 28 by the motor / ECU integrated unit 23, and the wiring 28 can be disposed in the unit case 24. Accordingly, the wiring work when the seat belt retractor 3 is attached to the vehicle body becomes unnecessary, and the attaching work of the seat belt retractor 3 is simplified, and noise generated from the wiring 28 is externally provided without providing a dedicated shield member. Leakage can be suppressed. As a result, the noise resistance of the seat belt retractor 3 can be improved and the cost can be reduced.

Further, the connection port of the ECU connector 25b of the ECU 25 is directed downward, the cover 24b of the unit case 24 is not provided with a through hole that opens upward, and the upper end of the case body 24a is formed by the annular flange portion 24b ₁ of the cover 24b. Since the outer periphery is covered over the entire periphery, the motor / ECU integrated unit 23 can be configured not to open upward at all. Thereby, it can suppress that liquids, such as water, permeate into unit case 24, and can improve each drip-proof nature of ECU25 and motor 26 effectively.

Further, according to the seatbelt device 1 provided with the seatbelt retractor 3 of this example, the motor 26 and the ECU 25 are integrated into a unit to simplify the assembly to the vehicle body, and the motor / ECU unit 23 is attached to the unit stay 29. Therefore, the degree of freedom of installation of the seat belt retractor 3 on the vehicle body can be increased. Thereby, since the seatbelt retractor 3 can be flexibly attached to the vehicle body, the convenience of the seatbelt apparatus 1 can be improved.
The present invention is not limited to the embodiments described above, and various design changes can be made within the scope of the matters described in the claims.

  INDUSTRIAL APPLICABILITY The seat belt retractor and the seat belt device of the present invention can be suitably used for a seat belt retractor that winds and pulls out a seat belt by a motor and a vehicle seat belt device including the seat belt retractor, and particularly includes a pretensioner. It can be suitably used for a seat belt retractor and a seat belt device.

It is a figure showing typically a seat belt device provided with an example of an embodiment of a seat belt retractor concerning the present invention. An example of embodiment of a seatbelt retractor concerning the present invention is shown, (a) is a figure seen from the cabin outside, (b) is a figure seen from the cabin interior, and (c) is a top view. (A) is sectional drawing which follows the IIIA-IIIA line | wire in Fig.2 (a), (b) is a bottom view of the seatbelt retractor shown in FIG. The operation of the pretensioner will be described, in which (a) shows a non-operating state, (b) shows a state immediately after the start of operation, and (c) shows an operating end state. It is a disassembled perspective view of a motor and ECU integrated unit. The motor / ECU unit is shown, (a) is a top view, (b) is a front view, (c) is a perspective view, and (d) is a cross-sectional view taken along the line VID-VID in (a). (A) is a left side view of the power transmission unit shown with the cover removed, (b) is a left side view of the power transmission retainer, and (c) is a right side view of the power transmission retainer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 3 ... Seat belt retractor, 4 ... Seat belt, 6 ... Tongue, 7 ... Buckle, 8 ... Frame, 8a ... Stee, 8b ... Base part, 8c ... Side wall, 9 ... Pretensioner, 9a ... Case DESCRIPTION OF SYMBOLS 10 ... Pipe, 10a ... Tip part, 10b ... Base end part, 10c ... Notch part, 13 ... Rotary shaft, 15 ... Pressure vessel, 16 ... Gas generator, 21 ... Power transmission unit, 21a ... Gear power transmission mechanism, 21b Retainer for power transmission, 22 Movement path, 23 Motor / ECU integrated unit, 24 Unit unit, 24a Case body, 24b Cover 24b ₁ Flange, 25 Electronic control unit (ECU), 25a ECU board,
25b ... ECU connector, 26 ... motor, 26a ... motor rotation shaft, 27 ... motor stopper, 28 ... wiring, 29 ... unit stay, 29a ... unit support, 29b ... frame mounting part

Claims (6)

A spool that winds up a seat belt; a frame that rotatably supports the spool; a motor that rotates the spool in a seat belt winding direction and a pull-out direction; and a power transmission unit that transmits the rotation of the motor to the spool. In a seat belt retractor comprising at least
An electronic control unit for controlling the motor;
The motor and the electronic control unit are integrally configured as a motor / electronic control unit,
The motor / electronic control unit unit includes a unit case,
The motor and the electronic control unit are housed in the unit case;
The unit case includes a case body having an upper opening, and a cover for closing the upper opening of the case body.
The seat belt retractor, wherein the unit case is supported by the frame with the unit stay. The cover has an annular flange portion formed so as to protrude downward on the entire outer periphery of the cover,
The cover is covered with an upper end portion of the case main body so as to close the opening thereof, and an outer periphery of the upper end portion of the case main body is covered with the flange portion of the cover over the entire periphery. The seat belt retractor according to 1.   The seat belt retractor according to claim 1 or 2, wherein each of the case body and the cover is formed of a thermally conductive material having high thermal conductivity. The electronic control device has a connector connectable to an external device,
The seatbelt retractor according to any one of claims 1 to 3, wherein a connection port of the connector is set downward. A pretensioner that rotates the spool in the seat belt winding direction by gas generated by a gas generator in an emergency;
The seat belt retractor according to any one of claims 1 to 4, wherein the gas generator of the pretensioner is disposed above the spool and supported by the frame. A seat belt retractor that winds up the seat belt; a tongue that is slidably supported by the seat belt; and a buckle that is provided on the vehicle body and that is detachably locked to the tongue.
The seat belt device according to any one of claims 1 to 5, wherein the seat belt retractor is the seat belt retractor.

Images