JP2010121762A - Fastening structure, fastening method, and power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening structure capable of positively detaching a bolt which is hard to detach by taking time, and achieving both theft prevention of a mounting member and maintainability, and to provide a fastening method and a power transmission device. <P>SOLUTION: A fastening tool 91 includes a bottomed cylindrical bolt cover 93 mounted on the bolt 92, and a spherical body 94 stored in the bolt cover 93. The bolt cover 93 includes: an insertion hole 93b into which a screw part 92b of the bolt 92 is inserted; a bottom part 93c abutted on a bottom face 92m of a head part 92a of the bolt 92; a peripheral wall part 93d projecting from an outer peripheral part of the bottom part 93c and surrounding the periphery of the head part 92a of the bolt 92; and a plurality of bent parts 93e provided at projecting ends of the peripheral wall part 93d and bent toward an axis O of the peripheral wall part 93d from the projecting ends of the peripheral wall part 93d. The spherical body 94 is stored in the bolt cover 93 to be positioned between distal ends 93m of the bent parts 93e and the head part 92a of the bolt 92. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fastening structure, a fastening method, and a power transmission device, and more particularly, to a fastening structure, a fastening method, and a power transmission device for fastening a mounting member to a mounted member using a fastener.

  Conventionally, as a fastener such as a bolt for fastening the mounting member to the mounted member, it is possible to prevent the mounting member or the mounted member from being stolen by preventing the mounting member from being removed from the mounted member. Anti-theft bolts that can be used are known and used in various fields.

  For example, in an automatic transmission for a vehicle or a power transmission device for a hybrid vehicle having both an internal combustion engine and an electric motor as a prime mover, the operation of a shift lever or shift switch is electrically detected, and the range switching means is electrically By adopting a so-called shift-by-wire (hereinafter referred to as SBW) control method, which is controlled by a controllable actuator, the mechanical operation linkage is replaced with an electrical operation system, so that the operation method and arrangement of the shift operation unit are free. There is something with a higher degree.

  Such a power transmission device is provided with a parking lock mechanism that mechanically locks any rotating member in the power transmission path from the prime mover to the drive wheels when the shift lever is operated to the parking range position. .

  In this type of conventional parking lock mechanism, when the parking range position is selected by a shift operation when the parking range position is selected by engaging or disengaging any rotating member in the power transmission path from the prime mover to the driving wheel, A rocking-type lock claw that engages and locks the rotating member, a linear motion cam that swings the lock claw, an operation link that moves the linear motion cam back and forth, and an SBW motor that rotates the operation link (For example, refer to Patent Document 1).

  In this parking lock mechanism, power transmission from a rotating member in a power transmission path to a driving wheel that is driven and connected by a transmission gear, a chain, a shaft, and the like by engaging a locking claw with the rotating member at a parking shift range position. Since the rotation of each part of the mechanism can be restricted, it is possible to prevent the vehicle from being stolen by preventing the vehicle from moving.

  However, in the power transmission device provided with such a parking mechanism, the parking lock mechanism in the case is removed when the SBW motor, which is an actuator mounted on the case of the power transmission device, is removed from the case of the power transmission device. When the swinging lock claw is detached from the rotating member by operating the tool with a tool or the like, the vehicle can be moved, so that the vehicle may be stolen.

  Therefore, it is conceivable to use the antitheft bolt described above so that the actuator cannot be removed from the case when the actuator is attached to the case in this way.

  As shown in FIG. 9, the anti-theft bolt includes a screw portion 131 that is screwed into a screw groove formed in a mounted member through a bolt insertion hole formed in the mounting member, and a screw portion 131. There is known a bolt 135 having an umbrella-shaped inclined portion 132 provided on the outer peripheral portion and an engaging portion 134 connected to the umbrella-shaped inclined portion 132 via a twisted portion 133 and engaged with a hexagon wrench on the outer peripheral portion. (For example, refer to Patent Document 2).

  When fastening the actuator to the case of the power transmission device with this bolt, after engaging the tool with the engaging portion 134 and screwing the screw portion 131 into the screw groove of the case, the torsion portion 133 is threaded, By separating the engaging portion 134 from the umbrella-shaped inclined portion 132, only the umbrella-shaped inclined portion that is not engaged by the tool can be exposed to the outside.

  Therefore, the actuator can be firmly engaged with the power transmission device by the bolt, and the bolt cannot be removed in this state, and the parking lock mechanism is operated from the outside to prevent the vehicle from being stolen. can do.

Further, in place of the bolt 135 having such a configuration, even when a one-way bolt having an engaging portion with which the tool is engaged only in one direction of the tightening direction is used, the actuator is firmly attached to the power transmission device by the bolt. It is possible to engage and prevent the bolt from being removed in this state (see, for example, Patent Document 3).
Japanese Patent No. 3692791 JP 2003-90173 A JP 2001-207705 A

  However, in such a conventional antitheft bolt, the actuator cannot be firmly engaged with the power transmission device by the bolt and the bolt cannot be removed in this state. The actuator cannot be removed.

  For this reason, it is conceivable that a hole is drilled in the bolt 135 or the one-way bolt to form a reverse tap, or the bolt 135 or the one-way bolt is directly hit with a hammer or the like via a punch or a screwdriver.

  However, if the bolt 135 or one-way bolt is directly hit with a hammer or the like, the screw groove of the case of the power transmission device may be damaged and the power transmission device needs to be replaced. As a result, foreign matters such as metal powder are generated, and a troublesome work such as cleaning during maintenance of the actuator becomes necessary.

  Further, since the bolt 135 or the one-way bolt can be removed by directly interfering with the bolt 135 or the one-way bolt by hitting the bolt 135 or the one-way clutch, the anti-theft effect is low.

  Further, when a bolt that can be easily removed is used, it is difficult to prevent the vehicle from being stolen.

  The present invention has been made to solve the above-described conventional problems, and it is difficult to remove the bolt, but the bolt can be surely removed over time, making it possible to achieve both anti-theft and maintainability of the mounting member. An object of the present invention is to provide a fastening structure, a fastening method, and a power transmission device.

  In order to achieve the above object, the fastening structure according to the present invention is (1) a fastening structure in which a mounting member is fastened to a mounted member via a fastener, wherein the fastener is integrated with the head and the head. A bolt having a threaded portion provided on the base, a bottomed cylindrical bolt cover attached to the bolt, and a sphere housed in the bolt cover, wherein the bolt cover has a threaded portion of the bolt. There are insertion holes to be inserted, a bottom part with which the bottom face of the bolt head comes into contact, a peripheral wall part protruding from the outer peripheral part of the bottom part and surrounding the periphery of the head part of the bolt, and a protruding end part of the peripheral wall part A plurality of bent portions that are bent from the protruding end portion of the peripheral wall portion toward the central axis of the peripheral wall portion, and the sphere is between the tip of the bent portion and the head of the bolt. The bolt cover to be located It is constructed from those that are housed in.

  With this configuration, in a state where the mounting member is fastened to the mounted member via a fastener, a sphere is interposed between the head of the bolt and the tip of the bent portion. It is possible to prevent the bolt from being easily removed by preventing the bolt from interfering with the head of the bolt, and it is possible to prevent the attachment member from being easily removed from the attachment member.

  Further, when removing the fastener from the mounted member, after extending the plurality of bent portions one by one in a direction away from the central axis of the peripheral wall portion using a tool or the like, the sphere is removed from the bolt cover, Because the fastener is removed from the mounted member over time by removing the bolt from the mounted member, the removal work of the fastener is continued for the theft by the amount of time required to remove the fastener. Can be complimented, and the mounting member can be prevented from being stolen.

  In addition, since the fastener can be removed securely over time, it can be removed by drilling the bolt with a drill or the like to form a reverse tap, or by directly hitting the bolt with a hammer or the like via a punch or screwdriver. There is no need, and it is possible to prevent the bolt and the mounting member from being damaged, and to prevent foreign matters such as metal powder from being generated during the operation of removing the fastener. For this reason, the maintenance of the mounting member can be easily performed without the need for a cleaning operation or the like for removing foreign matters during the maintenance of the mounting member.

  A fastening method for fastening the mounting member to the mounted member via the fastener according to (1) above, (2) using a tool in a state where the bottom part is in contact with the mounting member. After the threaded portion of the bolt is screwed to the mounted member via the mounting member, the sphere is press-fitted into the bolt cover through the tip of the bent portion.

  With this method, the mounting member is mounted on the mounted member via the fastener in a short time, and the workability of the mounting operation of the mounting member can be improved. In addition, in a state where the sphere is press-fitted into the bolt cover through the end of the bent portion, the press-fit pressure of the sphere cannot be removed from the bolt cover, so the press-fitting load of the sphere can be reduced. The press-fitting can be easily performed.

  The power transmission device according to the present invention includes (3) a shift-by-wire power that has a plurality of rotating members in a power transmission path for transmitting power from the prime mover of the vehicle to the drive wheels, and operates according to a shift operation. A case in which an actuator having a conversion mechanism for converting input energy into mechanical motion is externally provided; and provided inside the case and operated by the actuator, and the parking range position is set by the shift operation. A parking lock that mechanically locks any rotating member in the power transmission path when selected, and mechanically unlocks the rotating member when a non-parking range position is selected by the shift operation. And the actuator is fastened to the case via the fastener described in (1) above. And it is configured from the.

  With this configuration, it is possible to cause the thief to give up on continuing the removal work of the fastener as much as it takes time to remove the fastener, and to prevent the actuator from being stolen.

  In addition, since it is possible to prevent foreign matter such as metal powder from being generated when the fastener is removed, maintenance of the actuator can be performed without the need for cleaning work to remove the foreign matter that has entered the case during maintenance of the actuator. Can be easily performed.

  ADVANTAGE OF THE INVENTION According to this invention, although it is hard to remove, a bolt can be reliably removed over time, and the fastening structure and fastening method which can make anti-theft and maintenance property of a mounting member compatible can be provided.

  In addition, according to the present invention, it is difficult to remove an external actuator from the power transmission device, but it can be surely removed over time, preventing theft damage caused by unlocking the parking lock mechanism. It is possible to provide a power transmission device that can perform maintenance of the actuator with certainty.

Hereinafter, embodiments of a fastening structure, a fastening method, and a power transmission device according to the present invention will be described with reference to the drawings.
FIGS. 1-8 is a figure which shows one Embodiment of the fastening structure based on this invention, the fastening method, and a power transmission device.

First, the configuration will be described.
In FIG. 1, a power transmission device 10 as a mounted member is a hybrid transmission having a transmission case 11 as a case connected to an engine 1 that is a prime mover of a vehicle. The motor 13, the generator 14, the power split mechanism 15, and the inverter 16 are included.

  The electric motor 13 is constituted by a generator motor that is driven by a battery pack 19 mounted on the vehicle and can charge the battery pack 19 when the regenerative brake is operated.

  The generator 14 is driven by the power from the engine 1 to generate power and charge the battery pack 19. The battery pack 19 is formed by, for example, connecting a plurality of battery modules 19a each integrating a plurality of batteries (cells) in series.

  The power split mechanism 15 can distribute and split the power from the engine 1 to the drive wheels 51 and 52 side and the generator 14 via the power transmission shaft 53 and the differential device 54, and also functions as a speed change mechanism. It consists of a known gear mechanism.

  Although not shown in detail, in power transmission device 10 of the present embodiment, power split mechanism 15 that distributes power from engine 1 includes a sun gear, a plurality of pinions arranged around sun gear, and a pinion that rotates. And a planetary gear mechanism comprising a carrier that supports revolving and a ring gear having internal teeth that mesh with a plurality of pinions, and inputs power from the engine 1 to the carrier that supports the pinions, The power from the motor 13 is input to one of the ring gear and the sun gear of the planetary gear mechanism, for example, the ring gear, and the rotation of the sun gear is output to the input shaft of the generator 14. The ring gear is integrally mounted with a rotation output element for transmitting power to the drive wheels 51 and 52 side.

  The inverter 16 is a known one that optimally controls the direct current in the battery pack 19 and the alternating current for driving the electric motor 13 and the generator 14.

  The power transmission device 10 is equipped with a known power transmission mechanism that forms a power transmission path (indicated by arrows Pe and Pm in FIG. 1) for transmitting power from the engine 1 or the electric motor 13 to the drive wheels 51 and 52 side. The power transmission path has a plurality of rotating members 17 and 18 (not shown in detail) such as gears.

  One of the plurality of rotating members 17, 18 is integrally attached to a rotation output element of the electric motor 13, for example. Further, the other rotating member 18 is, for example, any one of a transmission gear or a reduction gear from the rotation output element to the differential device 54 capable of differential output to the drive wheels 51 and 52 in the power split mechanism 15. The transmission element is configured.

  On the other hand, the vehicle having the schematic configuration shown in FIG. 1 includes a shift lever 61 that is shifted by a driver, a range detection sensor 62 that detects a selected range that is the shift operation position, and detection information of the range detection sensor 62. And an electronic control unit (hereinafter referred to as ECU) 63 that electronically controls the operation of the power transmission device 10, and the shift lever 61 includes a plurality of travel ranges (a plurality of forward ranges (for example, D, L)). 2), a reverse range (for example, R)), a neutral range (for example, N), and a parking range (for example, P) are selected to be operated.

  The ECU 63 is not shown in detail in hardware configuration, but includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a backup memory. An input interface circuit including a D converter and the like, an output interface circuit including a relay circuit and the like, and a communication interface for communicating with other ECUs are configured.

  The power transmission device 10 includes a shift-by-wire parking lock mechanism 20 that is controlled by the ECU 63 so as to operate according to the range position selected by the shift lever 61. The parking lock mechanism 20 is provided in the transmission case 11.

  The parking lock mechanism 20 mechanically locks one of the rotating members 17 and 18 in the power transmission path, for example, the rotating member 17 when the parking range (P) is selected by the shift operation of the shift lever 61. When the non-parking range of any one of the plurality of forward ranges (D, L, 2), reverse range (R), and neutral range (N) is selected, the rotation member 17 is unlocked. Yes.

  Specifically, as shown in FIG. 2, the parking lock mechanism 20 includes an actuator mounted on the transmission case 11 and an SBW motor 21 as a mounting member, and a shaft 22 a that is splined to the SBW motor 21. An operation link 22 that is rotated by the SBW motor 21 and a linear cam 24 that is connected to the operation link 22 via a shaft member 24b and is supported by a guide portion 23 in the transmission case 11 so as to be movable in the substantially axial direction. Engaging with the frustoconical cam portion 24a of the linear cam 24, and engaging with either the rotary member 17 or 18 or the lock gear 25 integrally connected thereto in accordance with the axial movement of the linear cam 24. And the lock claw member 26 to be detached.

  When the parking range (P) is selected by the shift operation of the shift lever 61, the operation link 22 rotated by the SBW motor 21 rotates in the clockwise direction in FIG. By moving the lock claw member 26 that engages with the frustoconical cam portion 24a of the linear cam 24 and the lock gear 25, the rotation of the lock gear 25 is locked. Yes.

  When a range other than the parking range (P) is selected by the shift operation of the shift lever 61, the operation link 22 is rotated counterclockwise in FIG. The lock gear 25 can be rotated by moving the lock claw member 26 engaged with the frustoconical cam portion 24a of the linear motion cam 24 from the lock gear 25 by moving 24 to the left in FIG.

  In addition, the structure itself of the parking lock mechanism 20 is the same as a well-known thing. Further, the power transmission device 10 may be a known multi-stage automatic transmission. In this case, the operation link 22 has a manual valve operation function in the shift-by-wire system. This will drive the operating rod on the manual valve side.

  As shown in FIGS. 3 and 4, an SBW motor 21 that is an actuator for performing shift-by-wire control and an actuator as a mounting member is a conversion mechanism that converts electric power energy that is input energy into rotational motion that is mechanical motion. The SBW motor 21 is specifically configured as, for example, a switched reluctance motor, and the stator 31 and the rotor 32, and the motor case 33 that houses the stator 31 and the rotor 32.

  The motor case 33 includes a bottomed cylindrical case body 35 to which a cover fastening portion 34 made of, for example, a metal bolt is attached, and a cover member 37 to which a metal fastening part 36 made of, for example, an insert nut is integrally attached. The stator 31 is fitted in each of the case main body 35 and the cover member 37.

  Further, the cover member 37 is composed of a metal cover portion 38 and a resin cover portion 39 which are integrally formed with each other. As shown in FIG. 3, the metal cover portion 38 includes the stator 31 and the rotor 32. Covers one end.

  The resin cover portion 39 of the cover member 37 is formed of a resin having excellent moldability and high hardness. The resin cover portion 39 covers the outer surface of the metal cover portion 38 and forms the outer surface of the cover member 37. is doing.

  Specifically, a metal cover portion 38 that has been previously pressed into a shape as shown in FIG. 3 is embedded in a resin that forms the resin cover portion 39 by insert molding and is integrated with the resin cover portion 39. Is held in.

  Further, as shown in FIG. 4, the resin cover portion 39 has an integrated shape with a connector case 39h for electrical wiring connection, and an electrical machine connection contact (not shown) housed in the connector case 39h. The control board can be energized via the member and the electrical wiring.

  The metal fastening part 36 made of an insert nut is one screw member embedded in the resin cover portion 39 of the cover member 37, and is made of a metal cover made of a bolt provided on the motor case 33 side. The fastening portion 34 is the other screw member that is screw-coupled to the metal fastening component 36 from the side of the attachment surface 41m (see FIG. 3) to the outside of the SBW motor 21.

  The case body 35 includes a metal bracket portion 41 that forms an external attachment surface 41m, a metal case portion (not shown) that covers the output side of the SBW motor 21, that is, one end side of the stator 31 and the rotor 32. A metal case portion 43 and a resin case portion 43 covering the metal case portion are provided between the metal bracket portion 41 and the metal case portion.

  Here, the metal bracket part 41 has a plurality of fastening parts 41a, 41b, 41c fastened to the transmission case 11 by the anti-theft fasteners 91 (see FIG. 5), and the fastening parts 41a, 41b. 41c are respectively formed with bolt insertion holes 41d.

  Note that the rotor 32 of the SBW motor 21 is coupled directly to the shaft 22a that supports the operation link 22 of the parking lock mechanism 20 or indirectly through a built-in reduction mechanism (not shown).

  The rotor 32 has a motor case 33 through a bearing 45 on the cover member 37 side fitted to the center of the metal cover portion 38 and a bearing 46 fitted on the case body 35 side (metal case portion). Is supported rotatably.

  On the other hand, as shown in FIG. 6, the fastener 91 includes a head 92 a and a bolt 92 having a screw portion 92 b provided integrally with the head 92 a and a bottomed cylindrical bolt cover attached to the bolt 92. 93 and a sphere 94 accommodated in the bolt cover 93.

  The head 92a of the bolt 92 has a polygonal fitting groove into which a tool such as a hexagon wrench is fitted. The bolt 92 is operated in the tightening direction and the removing direction by the hexagon wrench. Is screwed into a thread groove 11 b formed in the transmission case 11. Further, the head 92a of the bolt 92 is formed in a polygonal shape such as a hexagon, and a hexagon wrench is fitted to the outer periphery of the head 92a, so that the bolt 92 is operated in the tightening direction and the removing direction by the hexagon wrench. It may be.

The bolt cover 93 has an insertion hole 93b through which the threaded portion 92b of the bolt 92 is inserted. The bolt cover 93 projects from the bottom portion 93c with which the bottom surface 92m of the head portion 92a of the bolt 92 abuts and the outer peripheral portion of the bottom surface 92m. A peripheral wall portion 93d that surrounds the periphery of the head portion 92a, and a plurality of (this embodiment) bent toward the central axis O of the peripheral wall portion 93d from the protruding end portion of the peripheral wall portion 93d. In the embodiment, six bending portions 93e are provided.
The sphere 94 is made of metal or resin, and is accommodated in the bolt cover 93 so as to be positioned between the distal end portion 93m of the bent portion 93e and the head portion 92a of the bolt 92.

Next, the operation will be described.
When the SBW motor 21 is attached to the transmission case 11 after the maintenance is completed or the like, as shown in FIG. 7A, the SBW with the screw portion 92b of the bolt 92 inserted into the insertion hole 93b of the bolt cover 93. The screw portion 92 b of the bolt 92 is inserted into the bolt insertion hole 41 d of the bracket portion 41 of the motor 21.

  Next, a hexagon wrench 95 is inserted into the bolt cover 93 through the end portion 93m of the bent portion 93e, and the screw portion 92b of the bolt 92 is screwed into the screw groove 11b of the transmission case 11 by the hexagon wrench 95.

  At this time, the bottom portion 93c of the bolt cover 93 is interposed between the bottom surface 92m of the head portion 92a of the bolt 92 and the fastening portions 41a, 41b, 41c of the bracket portion 41.

  Next, as shown in FIG. 7B, the sphere 94 is press-fitted into the bolt cover 93 through the end portion 93m of the bent portion 93e. At this time, the distal end portion 93m of the bent portion 93e bends downward to allow the sphere 94 to be press-fitted.

  In order to allow the sphere 94 to be press-fitted into the bolt cover 93 through the end portion 93m of the bent portion 93e, the distance between the end portions 93m of the bent portion 93e is formed to be smaller than the diameter of the sphere 94. .

  Further, the sphere 94 press-fitted into the bolt cover 93 is interposed between the distal end portion 93m of the bent portion 93e and the head portion 92a of the bolt 92, and the upper portion of the sphere 94 abuts on the bent portion 93e. The cover 93 will not come out.

  On the other hand, in the power transmission device 10 of the present embodiment, power transmission paths Pe and Pm for transmitting power from the engine 1 or the electric motor 13 to the drive wheels 51 and 52 are formed, and parking is performed by selecting the shift lever 61. When the range (P) is selected, the rotation member 17 integrated with the lock gear 25 as a rotation output element of any one of the power transmission paths Pe and Pm, for example, the electric motor 13 is moved by the parking lock mechanism 20. Locked mechanically.

  In this state, the rotation of each part of the power transmission mechanism from the rotating member 17 in the power transmission path Pm to the drive wheels 51 and 52 that are drivingly connected by a transmission gear, a chain, a shaft, or the like is also restricted. The vehicle can no longer move. Therefore, theft of the vehicle is effectively prevented.

  Here, in this state, the SBW motor 21 should be removed from the transmission case 11 and the shaft 22a is rotated through the insertion hole 11a of the transmission case 11 so that the parking lock mechanism 20 is unlocked. When performing the act, the head 92a of the bolt 92 is blocked by the sphere 94, and the act of rotating the head 92a of the bolt 92 by a tool or the like cannot be performed. It is possible not to interfere with the head 92a.

  For this reason, the SBW motor 21 cannot be removed from the transmission case 11 and the parking lock mechanism 20 cannot be unlocked.

  On the other hand, in order to perform maintenance of the SBW motor 21, it is necessary to remove the SBW motor 21 from the transmission case 11. In this case, as shown in FIG. 8 (a), the six bent portions 92e are separated from the central axis O of the peripheral wall portion 93d one by one using a tool 96 such as pliers (the direction indicated by the arrow a). ), The spherical body 94 is removed from the bolt cover 93 as shown in FIG.

  Next, as shown in FIG. 8C, the bolt 92 is removed from the transmission case 11 with a hexagon wrench 95.

  Thus, in this embodiment, the anti-theft fastener 91 for fastening the SBW motor 21 externally attached to the transmission case 11 to the transmission case 11 is provided, and the fastener 91 is connected to the head 92a and the head 92a. A bolt 92 having a screw portion 92 b provided integrally, a bottomed cylindrical bolt cover 93 attached to the bolt 92, and a sphere 94 accommodated in the bolt cover 93 were configured.

  Further, the bolt cover 93 has an insertion hole 93b through which the threaded portion 92b of the bolt 92 is inserted, and protrudes from the bottom portion 93c with which the bottom surface 92m of the head portion 92a of the bolt 92 abuts and the outer peripheral portion of the bottom portion 93c. A peripheral wall portion 93d surrounding the periphery of the head portion 92a, and a plurality of bent portions 93e provided at the protruding end portion of the peripheral wall portion 93d and bent from the protruding end portion of the peripheral wall portion 93d toward the central axis O of the peripheral wall portion 93d. And the sphere 94 is accommodated in the bolt cover 93 so as to be positioned between the distal end portion 93m of the bent portion 93e and the head portion 92a of the bolt 92.

  For this reason, when the SBW motor 21 is fastened to the transmission case 11 via the fastener 91, the sphere 94 is interposed between the head 92a of the bolt 92 and the tip 93m of the bent portion 93e. It is possible to prevent the tool 92 or the like from interfering with the head 92a of the bolt 92 from the outside so that the bolt 92 cannot be easily removed, and the SBW motor 21 cannot be easily removed from the transmission case 11. it can.

  Further, when removing the fastener 91 from the transmission case 11, a plurality of bent portions 93 e are extended one by one in a direction away from the central axis O of the peripheral wall portion 93 d using a tool or the like, and then the bolt cover 93 is removed. By removing the sphere 94 and then removing the bolt 92 from the transmission case 11, the fastener 91 is removed from the transmission case 11 over time, so that the removal work of the fastener 91 takes time. In addition to theft of the SBW motor 21, the possibility of the vehicle being stolen by operating the parking lock mechanism 20 can be reduced. Maintenance of the SBW motor 21 can be performed reliably.

  Further, since the fastener 91 can be surely removed over time, a hole or the like is formed in the head 92a of the bolt 92 with a drill or the like to form a reverse tap, or the bolt 92 can be removed via a punch or a screwdriver. It is not necessary to remove the head 92a by directly hitting it with a hammer or the like, which can prevent the bolt 92 and the SBW motor 21 from being damaged, and prevent foreign matter such as metal powder from being generated when the fastener 91 is removed. can do. For this reason, the maintenance of the SBW motor 21 can be easily performed without the need for a cleaning operation for removing foreign matters during the maintenance of the SBW motor 21.

  In the present embodiment, the threaded portion 92b of the bolt 92 is screwed into the transmission case 11 via the SBW motor 21 using a tool in a state where the bottom portion 93c of the bolt cover 93 is in contact with the SBW motor 21. After that, since the spherical body 94 is press-fitted into the bolt cover 93 through the end portion 93m of the bent portion 93e, the SBW motor 21 can be attached to the transmission case 11 via the fastener 91 in a short time, The workability of the mounting work of the SBW motor 21 can be improved.

  Further, in a state where the sphere 94 is press-fitted into the bolt cover 93 through the end portion 93m of the bent portion 93e, the press-fit pressure of the sphere 94 is sufficient so that the sphere 94 does not come off from the bolt cover 93. It is possible to easily press-fit the sphere 94.

  In the present embodiment, six bent portions 93e are provided, but six or more may be provided. If there are six or more, the man-hour for extending the bent portion 93e from the projecting end portion of the peripheral wall portion 93d toward the direction away from the central axis O of the peripheral wall portion 93d in order to remove the sphere 94 from the bolt cover 93 increases. The removal of the fastener 91 is further troublesome, and the anti-theft performance of the SBW motor 21 can be improved accordingly.

In the present embodiment, the SBW motor 21 is used as a vehicle anti-theft fastener to fasten the SBW motor 21 to the transmission case 11. However, the present invention is not limited to this, and the fastener 91 of the present invention is used for anti-theft. As a fastener 91 for use, it can be used for other fastening objects.
For example, when applied to a vehicle, a fastener 91 for preventing theft of a spare tire for fastening a tire carrier as a mounting member to which a spare tire is fastened to a vehicle body as a mounted member, and a steering as a mounting member May be used as a steering lock fastener 91 for fixing the hood to the mounted portion, and as a hood lock fixing fastener 91 for fixing the hood as a mounting member to the mounted member.

  When the fastener 91 is used in addition to the vehicle, the parking meter as a mounting member and the parking meter for fastening the parking meter to the mounted member are used as a fastener 91 for preventing theft of the parking meter, or vending as a mounting member. You may use as the anti-theft fastener 91 of the vending machine which fastens a machine to a to-be-mounted member.

  The point is that it is difficult to remove, but it can be surely removed over time, and it can be used as a fastener that can achieve both theft prevention and maintenance of the mounting member.

  In addition, the embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the fastening structure, the fastening method, and the power transmission device according to the present invention are difficult to remove, but can take the time to remove the bolts reliably, and can achieve both theft prevention and maintenance performance of the mounting member. It is useful as a fastening structure, a fastening method, a power transmission device, and the like for fastening a mounting member to a mounted member using a fastener.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of the fastening structure, fastening method, and power transmission device which concern on this invention, and is a schematic block diagram of the hybrid type power unit and SBW system of a vehicle provided with the power transmission device. It is a figure which shows one Embodiment of the fastening structure, fastening method, and power transmission device which concern on this invention, and is a perspective view which shows the principal part schematic structure of a parking lock mechanism. It is a figure which shows one Embodiment of the fastening structure, fastening method, and power transmission device which concern on this invention, and is a longitudinal cross-sectional view of an actuator. It is a figure which shows one Embodiment of the fastening structure which concerns on this invention, a fastening method, and a power transmission device, and is principal part sectional drawing of the back side which accumulated only the metal cover part of the cover member on the case main body of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of the fastening structure, fastening method, and power transmission device which concern on this invention, and is an external view of the power transmission device with which the actuator was fastened. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of the fastening structure, fastening method, and power transmission device which concern on this invention, (a) is sectional drawing of a fastener, (b) is a top view of a fastener. It is a figure which shows one Embodiment of the fastening structure, fastening method, and power transmission device which concern on this invention, and is a figure which shows the attachment procedure of a fastener. It is a figure which shows one Embodiment of the fastening structure which concerns on this invention, a fastening method, and a power transmission device, and is a figure which shows the removal procedure of a fastener. It is an external view of the conventional volt | bolt.

Explanation of symbols

1 engine (motor)
10 Power transmission device (attached member)
11 Transmission case (case)
17, 18 Rotating member 20 Parking lock mechanism 21 SBW motor (mounting member, actuator)
31 Stator (Conversion mechanism)
32 Rotor (conversion mechanism)
91 Fastener 92 Bolt 92a Head 92b Screw portion 92m Bottom surface 93 Bolt cover 93b Insertion hole 93c Bottom portion 93d Peripheral wall portion 93e Bending portion 93m Tip portion 94 Sphere

Claims (3)

In the fastening structure in which the mounting member is fastened to the mounted member via a fastener,
The fastener includes a head and a bolt having a screw portion provided integrally with the head, a bottomed cylindrical bolt cover attached to the bolt, and a sphere stored in the bolt cover. Prepared,
The bolt cover has an insertion hole through which a screw portion of the bolt is inserted, a bottom portion on which the head bottom surface of the bolt abuts, and a peripheral wall that protrudes from the outer peripheral portion of the bottom portion and surrounds the periphery of the head portion of the bolt And a plurality of bent portions provided at the protruding end portion of the peripheral wall portion and bent from the protruding end portion of the peripheral wall portion toward the central axis of the peripheral wall portion,
A fastening structure, wherein the spherical body is housed in the bolt cover so as to be positioned between a tip portion of the bent portion and a head portion of the bolt. A fastening method for fastening the mounting member to the mounted member via the fastener according to claim 1,
In a state where the bottom portion is in contact with the mounting member, the screw portion of the bolt is screwed to the mounting member through the mounting member using a tool, and then passed between the front end portions of the bent portions. A fastening method characterized by press-fitting the sphere into a bolt cover. A power transmission device of a shift-by-wire system having a plurality of rotating members in a power transmission path for transmitting power from a prime mover of a vehicle to a driving wheel side, and operating according to a shift operation,
A case in which an actuator having a conversion mechanism for converting input energy into mechanical motion is packaged;
It is provided inside the case, is operated by the actuator, and mechanically locks any rotating member in the power transmission path when a parking range position is selected by the shift operation. A parking lock mechanism that mechanically unlocks the rotating member when a non-parking range position is selected,
The power transmission device, wherein the actuator is fastened to the case via the fastener according to claim 1.

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