JP5723122B2 - Attachment fixing structure - Google Patents

Description

  The present invention relates to a fixing structure for fixing an attachment such as a motor to an attachment such as a circuit board to which the attachment is attached.

  2. Description of the Related Art Conventionally, attachment objects such as motors are used as actuator parts in the fields of various OA equipment, home appliances, automobiles, and the like. Vehicles such as automobiles are equipped with a vehicular instrument device that displays measured values such as vehicle speed and engine speed. In this vehicular instrument device, a pointer disposed on the front face of the dial is driven. A stepping motor or the like is used as the internal unit.

  As shown in FIG. 5, this type of stepping motor 120 has a motor main body 121 attached to a circuit board 130 of an instrument device, and an output shaft 122 protruding from the motor main body 121 and attaching the pointer and the like.

  When connecting the terminal 124 of the stepping motor 120 and the conductor pattern of the circuit board 130, the terminal 124 is inserted into the terminal hole 160 provided in the circuit board 130 and between the terminal 124 and the terminal hole 160. These parts are brazed using a solder 140 and a soldering iron 150. However, the solder 140 used for conventional brazing contains lead, which is an environmentally hazardous substance. However, due to the recent growing interest in protecting the global environment, a connection structure that does not use the solder 140 is desired. (For example, see Patent Document 1).

By the way, there is a movement 400 as shown in FIG. 6 as a movement structure for driving a pointer of an in-vehicle combination meter.
The movement 400 has fixed claws 420 projecting from both side surfaces of the case 410, and the movement 400 is fixed to the circuit board 500 by inserting the fixed claws 420 into the fixing holes 510 formed in the circuit board 500. (See FIGS. 6A and 6B), and the fixing work can be easily performed.

A fixing structure for fixing the movement 400 to the circuit board 500 will be described with reference to FIG.
1) As shown in FIG. 1A, the fixing claw 420 before being inserted into the circuit board 500 is formed in a substantially cylindrical shape, and the inner hole 421 of the fixing claw 420 is formed along the inner surface of the inner hole 421. A lock piece 430 that can be lowered is engaged with the upper part.
2) In order to fix the case 410 of the movement 400 having such a fixing claw 420 to the circuit board 500, the lock piece 430 is moved to the innermost part (lowermost part) of the inner hole 421 as shown in FIG. Let it be inserted.
3) That is, when the lock piece 430 is pushed out from above by using an appropriate jig such as the lock piece insertion rod 440, the lock piece 430 is inserted into the inner hole 421 as shown in FIG. Is stopped when it is pushed out to the lower end, that is, the tip claw 422.
4) As a result, pressure acts on the fixing claw 420 in the opening direction, and the movement is fixed to the circuit board 500, so that the movement 400 can be fixed to the circuit board 500.

JP 2007-202323 A

  However, according to the fixed structure configured as described above, for example, the lock piece 430 and the fixed claw 420 of the movement 400 repeatedly expand and contract due to a temperature change, and the contact pressure between the lock piece 430 and the inside of the fixed claw 420 decreases. There is a risk that the lock piece 430 may drop due to a decrease in holding force, and the movement function 400 may come out of the circuit board 500 due to vibration or impact without being able to exhibit the lock function.

  The present invention has been made in view of the above-described circumstances, and the purpose thereof is to fix an attachment that can be securely fixed to a substrate without rattling without being affected by temperature changes such as the external environment. To provide a structure.

In order to achieve the above-mentioned object, the attachment fixing structure according to the present invention is characterized by the following (1) to (2).
(1) A fixing structure in which a fixing claw member provided in a case of an attachment is inserted into a fixing hole provided in an attachment, and the attachment is fixed to the attachment.
The fixed claw member has a push hole into which the lock piece is inserted,
On the inner wall of the pressing hole, a partition wall protruding toward the inner side of the pressing hole is formed,
The lock piece is inserted into the push hole by being pushed into the push hole by a jig and overcoming the partition, and then sandwiched by the jig and the bottom wall of the push hole and deformed in the diameter increasing direction. The locking piece is locked to the partition so as to prevent movement in the direction opposite to the direction, and the fixing claw member pressed from the inside of the pressing hole by the deforming locking piece is locked to the fixing hole. To
about.
(2) A fixing structure in which a fixing claw member provided in a case of an attachment is inserted into a fixing hole provided in the attachment, and the attachment is fixed to the attachment.
The fixed claw member has a push hole into which the lock piece is inserted,
On the inner wall of the pressing hole, a partition wall protruding toward the inner side of the pressing hole is formed,
After the lock piece is pushed into the push hole by a jig and gets over the partition wall, the lock piece is sandwiched by the jig and the bottom wall of the push hole to be deformed, thereby being opposite to the insertion direction into the push hole. The locking piece is locked to the partition so as to prevent movement in the direction, and the fixing claw member pressed from the inside of the pressing hole by the deforming locking piece is locked to the fixing hole,
The attachment is integrally formed by combining the first case and the second case,
Each of the first case and the second case forms a part of the fixed claw member, and the push hole into which the lock piece is inserted by combining the first case and the second case is provided. Formed,
The partition is formed on a part of the inner wall of the first case that defines the push hole, or on a part of the inner wall of the second case that defines the push hole,
The bottom wall is a part of the inner wall of the first case that defines the push hole, or a part of the inner wall of the second case that defines the push hole.
about.

  According to the fixing structure of the attachment having the configuration of (1) and (2) above, when the lock piece is pushed into the push hole by the jig, gets over the partition wall, and reaches the final lock position, the lock piece is pushed in. Because the deformed lock piece pushes out part of the fixed claw member outward and presses it against the fixing hole of the attachment, the attachment can be attached without being affected by temperature changes such as the external environment. It becomes possible to fix and assemble the object firmly.

  According to the fixing structure of the attachment of the present invention, the fixing claw member has a pressing hole into which the lock piece is inserted in the central portion, and in the vicinity of a part where the locking piece is finally pushed into the pressing hole. A partition wall is projected, and when the lock piece is pushed into the push hole with a jig, gets over the partition wall and reaches the innermost part, a part of the lock piece is pushed outward by the stress from the lock piece. Since the fixing hole that is pushed out to the object to be attached is pressed, it is possible to firmly fix and assemble it to the substrate without being affected by temperature changes such as the external environment. Moreover, according to the attachment fixing structure of the present invention, it is possible to fix the attachment without rattling, so that the generation of abnormal noise can be prevented and a high-quality fixing structure can be realized.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

It is a disassembled perspective view of the meter unit to which the attachment fixing structure according to the embodiment of the present invention is applied. It is a perspective view which shows the state when attaching the instrument unit to a circuit board. (A) and (B) are the state before the lock piece is pushed into the inside of the fixing claw member (the semi-cylindrical protrusion provided on both sides of the lower case) of the instrument unit shown in FIG. It is explanatory drawing shown. (A)-(D) are explanatory drawings which show the process of the fixing operation | work when attaching the meter unit shown in FIG. 2 to a circuit board. It is sectional drawing which shows the attachment method by the solder to the circuit board of the conventional meter apparatus. (A) And (B) is explanatory drawing which shows the attachment structure of the movement structure for a pointer drive. (A) thru | or (C) is explanatory drawing which shows the fixing work method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 show an instrument unit 1 to which an attachment fixing structure according to an embodiment of the present invention is applied.
The instrument unit 1 constitutes an attachment according to the present invention, and movement parts such as a step motor 5, a reduction gear train, and a rotating shaft 8 are accommodated in a motor case 4.

  The meter device to which the instrument unit 1 is mounted is mounted with a light source 3 mounted on a circuit board (hereinafter abbreviated as “substrate 2”) that constitutes an attachment of the present invention shown in FIG. The above-mentioned instrument unit 1 constituting an attachment attached to a predetermined place on the substrate 2 including the region, and numbers, letters, scales, and the like installed on the upper part of the instrument unit 1 A display board (not shown) that displays necessary information regarding the environment and the like.

  The meter device to which the meter unit 1 of the present embodiment is applied constitutes a part of a combination meter (not shown), and a display plate forming the surface side is fitted over the entire surface to constitute a turn-back plate. Yes. In addition, various display windows for installing various instruments including the instrument unit 1 are opened on the display board, and the display panel is integrated with a combination meter case constituting the side surface and the back surface side. Further, the upper portion of the display board is covered with a transparent cover glass (not shown) such as black.

  Note that the meter device to which the meter unit 1 of the present embodiment is applied constitutes a speedometer, for example. In this case, based on a sensor signal corresponding to the current speed detected by a sensor (not shown), a pointer described later is rotated by a predetermined angle, and the current speed is indicated by pointing a specific number formed on a display board (not shown). Analog display.

  The light source 3 is composed of, for example, an LED (Light Emitting Diode) that emits visible light having a predetermined wavelength (λ), and is in a state facing the lower end surface 8D of the rotating shaft 8 to be described later. It is mounted on the substrate 2 directly below. The LED as the light source 3 has an optical axis set in the Z direction perpendicular to the upper surface of the substrate 2, and most of the main light from this LED (hereinafter referred to as illumination light) is directly above. The light is emitted toward the lower end face 8 </ b> D that forms the light receiving portion of the rotating shaft 8. Illumination light incident from the lower end surface 8D of the rotating shaft 8 is guided to the upper end 8A of the rotating shaft 8 protruding from the upper portion of the motor case 4, and is press-fitted into the upper end 8A. The outside pointer is configured to emit light.

  The motor case 4 is fixed to the substrate 2, and is composed of a lower case 4A constituting the first case and an upper case 4B constituting the second case superimposed on the lower case 4A. These cases are combined together in a state where they are stacked one above the other. Inside the motor case 4, a step motor 5, an intermediate gear 6, an output gear 7, and a rotary shaft 8 (not including the upper end) 8 integrally formed with the output gear 7 are accommodated. doing.

  The lower case 4A has a substantially box shape with an upper opening. Further, the lower case 4A is provided with semi-cylindrical protrusions 9A projecting downward (−Z direction) from the lower surface on both left and right side portions, and combined with a semi-cylindrical protrusion 9B of the upper case 4B described later. A cylindrical fixed claw member 9 is formed, and the fixed claw member 9 is configured to be fitted into each fixed hole 21 opened in the substrate 2.

  Further, a bearing 42 is formed inside the lower case 4A so as to project in a cylindrical shape from the center of a recess (not shown) formed on the lower surface toward the upper case 4B. The bearing 42 is provided with a shaft hole 42A (see FIG. 1) that rotatably supports the lower side of the rotary shaft 8. Further, on the inner surface of the lower case 4A, as shown in FIG. 1, a bearing 43 and a bearing 44 that protrude slightly in a cylindrical shape toward the upper case 4B are formed at predetermined positions.

  On the other hand, the upper case 4B is provided with a shaft hole 45 at a portion directly above the shaft hole 42A of the bearing 42 provided at the center of the recess of the lower case 4A. The upper side of the shaft 8 penetrates in a rotatable state. Further, in the upper case 4B, bearings (not shown) are formed on the inner surface (ceiling surface) of the upper portion corresponding to the bearings 43 and 44 of the lower case 4A. Further, the upper case 4B of the present invention is provided with semi-cylindrical protrusions 9B that protrude downward (in the −Z direction) on both the left and right side surfaces.

  The semi-cylindrical protrusion 9A and the semi-cylindrical protrusion 9B constituting the fixed claw member 9 are only in close contact with each other even after the upper and lower cases 4A and 4B are combined together. Thus, the diameter can be slightly increased outward.

  As shown in FIG. 3, the semicylindrical protrusion 9 </ b> A of the lower case 4 </ b> A constitutes one half of the fixed claw member 9 and has a substantially semicylindrical shape. The semi-cylindrical protrusion 9A includes, in addition to the inner wall 91 that forms the push-in hole 90 when combined with the semi-cylindrical protrusion 9B of the upper case 4B that also forms the other half (partner side), a partition wall 92 and A bottom wall 93 is provided on a part of the inner wall 91. In addition, the inner diameter of the upper and lower portions of the push-in hole 90 is provided on the semi-cylindrical protrusion 9A of the present embodiment so that a lock piece 10 described later is lightly locked and temporarily placed (or temporarily fixed). A reduced diameter taper portion 95 with different dimensions is formed on a part of the inner wall 91. When the fixed claw member 9 is formed on one of the upper and lower cases 4A and 4B by forming the fixed claw member 9 by combining the semicylindrical protrusion 9A and the semicylindrical protrusion 9B, it is necessary to perform die cutting in the molding process. The pushing hole that had to be made into the hole having the bottom penetrating from the nature can be the one in which the bottom wall 93 is formed.

  The inner wall 91 defines a substantially cylindrical push hole 90 by an inner wall 94 (see FIG. 4) on the semi-cylindrical protrusion 9B side which is a half of the upper case 4B. The inside of the push hole 90 is pushed downward (in the −Z direction), and is locked at the lowest position (the deepest part).

  The partition wall 92 allows the lock piece 10 described later to move only downward (−Z direction) and prevents the lock piece 10 from moving in the opposite direction, and is formed on the semicylindrical protrusion 9A side of the lower case 4A. Yes. The partition wall 92 allows the lock piece 10 to move over the partition wall 92 and move downward when the lock piece 10 is pushed along the inner wall inside the push hole 90 with a rod-shaped jig 11 or the like, and to return upward. The shape can be prevented, for example, a protrusion that is inclined downward.

  The bottom wall 93 is formed at a lock position where the lock piece 10 is finally dropped, and prevents the lock piece 10 from dropping out from the push hole 90 to the outside even if it is pushed further.

  The semi-cylindrical protrusion 9B of the upper case 4B basically has an internal structure that is the same as that of the lower case 4A except that the partition wall 92 and the bottom wall 93 are not formed and a locking protrusion 96 is formed on the outer surface. The semi-cylindrical protrusion 9A has an equivalent shape and a substantially semi-cylindrical shape, and has an inner wall 94 that defines a pressing hole 90 when combined with the semi-cylindrical protrusion 9A of the lower case 4A.

  The lock piece 10 has a shape that can be elastically deformed over the partition provided in the push hole 90 of the fixed claw member 9 by being pushed into the push hole 90 with a rod-shaped jig 11 or the like. The lock piece 10 of the present embodiment is formed using an appropriate resin material. For example, as shown in FIG. 3, the lock piece 10 has two base end portions opposite to the tip end portion when inserted (or 3). By forming the groove 10A divided into two or more), flexibility is provided. In addition, the lock piece 10 of this embodiment maintains the state by which the part (half meniscus) of the both sides of the groove | channel 10A was pushed open by applying fixed pushing force to the groove | channel 10A with the jig | tool 11 mentioned later. When the lock piece 10 whose base end portion is pushed open is engaged with the partition wall 92, the lock piece 10 can be prevented from returning upward.

  For example, as shown in FIG. 4, the jig 11 has a substantially rod-like configuration having an outer diameter dimension that is at least smaller than the outer diameter dimension of the push-in hole 90, and the tip side enters the groove 10 </ b> A of the lock piece 10 to enter the groove. It has a sharp tapered shape so that the proximal ends of the lock pieces 10 on both sides of 10A can be expanded. In this way, by pushing the lock piece 10 wide, the lock piece 10 dropped into the lock position is prevented from coming out upward from the lock position of the push hole 90, and the lock piece 10 is dropped into the lock position. Thus, the diameter of the semicylindrical protrusion 9A and the semicylindrical protrusion 9B is expanded outward, and the fixed claw member 9 is prevented from escaping from the fixing hole 21 of the substrate 2.

  The step motor 5 is for rotating a rotary shaft 8 (finally an unillustrated pointer), and is a reduction gear train, that is, an intermediate gear 6 and an output gear 7 (especially not these gear trains but a single gear train). The rotating shaft 8 is rotated while being decelerated via a single gear. Then, by rotating the rotary shaft 8, the pointer integrated therewith is rotated along the surface of the display plate to indicate various necessary information. As shown in FIG. 1, the step motor 5 of the present embodiment includes a stator 51 and a rotor 52 attached to a rotor shaft (not shown) at the center of the stator 51 that is opened.

  The stator 51 is fixed to the lower case 4A, and a magnetic core serving as a magnetic pole protrudes inside the opening. A coil 51A wound around a bobbin is mounted on the magnetic core.

  The rotor 52 is formed in a substantially cylindrical shape with an appropriate magnetic material, and is rotatably installed in the central portion where the stator 51 is opened. A small-diameter rotor gear 53 having a small number of teeth is concentrically fixed on the upper portion. A plurality of magnets (not shown) are fixed to the outer peripheral surface. A rotor shaft (not shown) to which the rotor 52 is attached is rotatably supported between a bearing 43 provided on the lower case 4A and a bearing (not shown) provided on the upper case 4B.

  The intermediate gear 6 is fixed to a support shaft (not shown), and this support shaft is rotatably supported between a bearing 44 provided on the lower case 4A and a bearing (not shown) provided on the upper case 4B. . In the intermediate gear 6, large teeth 61 provided on the outer periphery are engaged with a small-tooth rotor gear 53 fixed to the upper portion of the rotor 52, and the rotational speed from the rotor 52 is reduced and transmitted. . Further, a small-diameter pinion 62 having a small number of teeth is coaxially fixed integrally with the support shaft on the upper portion of the intermediate gear 6.

  The output gear 7 is formed integrally with the rotary shaft 8 in the vicinity of the middle of the rotary shaft 8 in order to transmit the rotational force from the pinion 62 of the intermediate gear 6 to the rotary shaft 8. The output gear 7 of the present embodiment is integrally formed with a rotary shaft 8 having a light guide function, which will be described later, by an appropriate transparent resin material. The case where the output gear 7 and the rotary shaft 8 are integrally formed will be described. However, the output gear 7 and the rotary shaft 8 are formed as separate bodies, and the rotary shaft 8 is mounted so as to pass through and be fixed to the output gear 7. But you can.

  Further, the output gear 7 has a large tooth 71 provided on the outer periphery thereof and meshed with a pinion 62 provided on the upper portion of the intermediate gear 6, and the rotational speed of the intermediate gear 6 is further reduced and transmitted. Rotate. For this reason, the rotating shaft 8 formed integrally with the output gear 7 rotates integrally at the same angular velocity as the output gear 7 which is greatly decelerated, and the pointer can be rotated with high accuracy.

  The rotating shaft 8 is formed integrally with the output gear 7 from an appropriate light-transmitting (or light-guiding) resin material having excellent light guiding properties. Specifically, the rotary shaft 8 is provided so as to protrude upward and downward from the disk-shaped gear body of the output gear 7, and the upper core of the rotary shaft 8 extending vertically upward with respect to the gear body. The lower axis of the rotary shaft 8 extending vertically downward with respect to the gear body and the gear shaft of the gear body are located on the same straight line. The rotating shaft 8 has a substantially cylindrical shape for guiding the illumination light from the light source 3 to the pointer.

  The rotating shaft 8 has a larger outer diameter (particularly the outer diameter on the lower side is also thicker) than a rotating shaft that does not have a light guiding function in order to secure a required amount of light. Thus, since the outer diameter dimension of the lower side of the rotating shaft 8 is made larger, the light receiving efficiency with respect to the illumination light from the light source 3 is higher than that of the small diameter dimension.

  Further, as described above, the upper tip 8A side of the rotating shaft 8 protrudes from the shaft hole 45 of the upper case 4B to the outside of the case 4, and a pointer is assembled to the tip 8A protruding to the surface of the display board. It has been. The upper side of the rotary shaft 8 is rotatably supported by a shaft hole 45 on the upper case 4B side, and the lower side is rotatably supported by a shaft hole 42A of a bearing 42 provided in the lower case 4A. ing.

  As described above, the rotating shaft 8 faces the lower end surface 8D directly above the light source 3. Accordingly, when the illumination light from the light source 3 is incident on the end face 8D, most of the illumination light is repeatedly reflected (for example, total reflection or regular reflection) at the interface with the outer peripheral surface inside the rotary shaft 8. The light is guided and propagates toward the upper tip.

Next, an assembling method for fixing the instrument unit 1 of the present embodiment to the substrate 3 and an action associated therewith will be described with reference to FIG.
1) In order to fix and assemble the case 4 formed by combining the lower case 4A and the upper case 4B to the substrate 2, first, the lock piece 10 is inserted into the pressing hole 90. Then, the lock piece 10 is temporarily fixed to the reduced diameter taper portion 95 (see FIG. 4A). Note that the lock piece 10 may be inserted into the push hole 90 in advance and temporarily fixed before the assembly work here.
2) In this state, the fixing claw members 9 on both sides of the case 4 are pushed into the fixing holes 21 of the substrate 2 respectively (see FIG. 5B).
3) Thereafter, the rod-shaped jig 11 is inserted into the push-in hole 90 of the fixed claw member 9 from above, and the lock piece 10 is pushed out at the tip, and pushed downward. And it pushes in until it gets over the partition 92 provided in the pressing hole 90 of the fixed nail | claw member 9 (refer the figure (C)).
4) Finally, the distal end side of the jig 11 is strongly pushed into and inserted into the groove 10A of the lock piece 10 to push the base end portions (half meniscus) of the lock piece 10 on both sides of the groove 10A. In this way, the lock piece 10 is maintained in a state where the base end portion is pushed and spread by pushing both side portions of the groove 10 </ b> A of the lock piece 10. Therefore, the proximal end portion of the pushed lock piece 10 is locked to the partition wall 92, so that the lock piece 10 can be securely held in the locked position at the lock position. Thereby, it becomes possible to prevent the dropped lock piece 10 from coming out upward from the lock position of the push hole 90. Further, by dropping the lock piece 10 into the lock position and pushing it out, the semi-cylindrical protrusion 9A and the semi-cylindrical protrusion 9B are pressed from the inside of the push-in hole 90, and the diameter is expanded outward. . As a result, it is possible to prevent the fixed claw member 9 from escaping from the fixed hole 21 of the substrate 2.

  As described above, according to the present embodiment, when the lock piece 10 is pushed into the push hole 90 by the jig 11 and gets over the partition wall 92, the fixed claw member 9 is pushed into the lock piece 10. A part thereof is pushed outward by the stress from the lock piece 10 and presses the fixing hole 21 provided in the substrate 2. As a result, the instrument unit 1 can be firmly fixed to the substrate 2 and assembled without being affected by temperature changes such as the external environment.

  Moreover, according to the attachment fixing structure of the present embodiment, the instrument unit 1 can be fixed to the substrate 2 without rattling, so that the inner diameter dimension of the pressing hole 90 of the fixing claw member 9 can be adjusted. Alternatively, by adjusting the outer diameter of the lock piece 10, it is possible to prevent the generation of abnormal noise and to realize a high-quality fixing structure.

  Furthermore, according to the attachment fixing structure of the present embodiment, secondary vibration is avoided from occurring in the fixing claw member 9 of the instrument unit 1 due to the vibration of the vehicle in which the instrument unit 1 is installed. Since this is possible, it is possible to prevent blurring of the pointer, and the accuracy of the pointer is increased.

  Further, according to the attachment fixing structure of the present embodiment, the rotary shaft 8 is integrated with the pointer, and even in a vehicle in which the instrument unit 1 in which the occurrence of vibration is frequently expected is installed, Variations in the amount of received light and the efficiency of light reception between the rotary shaft 8 and the light source 3 can be suppressed as much as possible, and a stable pointer light emission can be realized at all times.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention. For example, in the above-described embodiment, the partition wall 92 and the bottom wall 93 are formed on the semi-cylindrical protrusion 9A of the lower case 4A. However, the partition wall 92 and the bottom wall 93 are formed on the semi-cylindrical protrusion 9B of the upper case 4B. The partition wall 92 may be formed on one of the semi-cylindrical protrusion 9A of the lower case 4A or the semi-cylindrical protrusion 9B of the upper case 4B, and the bottom wall 93 may be formed on the semi-cylindrical protrusion 9A of the lower case 4A or the upper case 4B. A structure formed on the other half of the semi-cylindrical protrusion 9B may be used.

  In addition, the instrument unit of the present invention can be applied to various instruments such as a fuel meter section, a tachometer section, a speedometer section, and a water temperature gauge. Moreover, in this embodiment, although the attachment was comprised with the meter unit, it may be comprised, for example with various types of motors, and may be various other electronic devices and electric devices. Similarly, in the present embodiment, the attached object is configured by a circuit board such as a wiring board, but is not particularly limited thereto.

DESCRIPTION OF SYMBOLS 1 Instrument unit 2 Board | substrate 21 Fixed hole 3 Light source 4 Motor case 4A Lower case 4B Upper case 42 Bearing 42A Shaft hole 5 Step motor 51 Stator 52 Rotor 6 Intermediate gear 7 Output gear 8 Rotating shaft 8D End face 9 Fixed claw member 9A Semi-cylindrical protrusion 9B Semi-cylindrical protrusion 90 Push hole 91, 94 Inner side wall 92 Partition wall 93 Bottom wall 95 Reduced diameter taper part 96 Locking protrusion 10 Lock piece 10A Groove 11 Jig

Claims (2)

A fixing claw member provided in the case of the attachment is inserted into a fixing hole provided in the attachment, and the attachment is fixed to the attachment,
The fixed claw member has a push hole into which the lock piece is inserted,
On the inner wall of the pressing hole, a partition wall protruding toward the inner side of the pressing hole is formed,
The lock piece is inserted into the push hole by being pushed into the push hole by a jig and overcoming the partition, and then sandwiched by the jig and the bottom wall of the push hole and deformed in the diameter increasing direction. The locking piece is locked to the partition so as to prevent movement in the direction opposite to the direction, and the fixing claw member pressed from the inside of the pressing hole by the deforming locking piece is locked to the fixing hole. To
An attachment fixing structure characterized by that. A fixing claw member provided in the case of the attachment is inserted into a fixing hole provided in the attachment, and the attachment is fixed to the attachment,
The fixed claw member has a push hole into which the lock piece is inserted,
On the inner wall of the pressing hole, a partition wall protruding toward the inner side of the pressing hole is formed,
After the lock piece is pushed into the push hole by a jig and gets over the partition wall, the lock piece is sandwiched by the jig and the bottom wall of the push hole to be deformed, thereby being opposite to the insertion direction into the push hole. The locking piece is locked to the partition so as to prevent movement in the direction, and the fixing claw member pressed from the inside of the pressing hole by the deforming locking piece is locked to the fixing hole,
The attachment is integrally formed by combining the first case and the second case,
Each of the first case and the second case forms a part of the fixed claw member, and the push hole into which the lock piece is inserted by combining the first case and the second case is provided. Formed,
The partition is formed on a part of the inner wall of the first case that defines the push hole, or on a part of the inner wall of the second case that defines the push hole,
The bottom wall is a part of the inner wall of the first case that defines the push hole, or a part of the inner wall of the second case that defines the push hole.
An attachment fixing structure characterized by that .

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