JP6209363B2 - Automotive parts - Google Patents

Description

  The present invention relates to a component that has a housing on which a stud bolt is mounted and is mounted on a vehicle.

  As this type of component, there is a lighting device mounted on a front end portion of a vehicle. A stud bolt is attached to the back surface of the housing that defines a lamp chamber in which a lamp that illuminates a predetermined direction is accommodated. The stud bolt is fitted into a receiving member provided on the vehicle body side when the lighting device is fixed to the vehicle body.

  The stud bolt has a tapping portion having a thread formed on the outer peripheral surface. For example, a boss is formed in the housing. The boss has a cylindrical peripheral wall, and a bottomed hole is defined inside the peripheral wall. The stud bolt is attached to the housing by screwing the tapping portion into the hole (for example, see Patent Document 1).

JP-A-10-244869

  When the tapping portion is screwed toward the bottom of the hole, the thread formed on the tapping portion forms a screw groove on the inner peripheral surface of the hole. That is, the hole of the housing is formed so that its inner diameter is slightly smaller than the outer diameter of the tapping portion. For this reason, cracks may be formed on the peripheral wall of the boss due to stress that tries to expand the hole generated when the screw groove is formed. In such a case, the fixing strength of the stud bolt to the housing is reduced. That is, the fixing of the lighting device to the vehicle body becomes unstable.

  Therefore, an object of the present invention is to provide a technique for suppressing stress generated when a tapping portion of a stud bolt is screwed into a hole formed in a housing.

In order to achieve the above object, one aspect of the present invention is an in-vehicle component,
A housing formed with a hole having a bottom;
A stud bolt having a tapping portion with a thread formed on the outer peripheral surface;
The tapping portion is screwed into the hole,
A plurality of grooves are formed on the outer peripheral surface so as to cross the thread,
A concave portion is formed on a surface of the tapping portion that faces the bottom.

  At the time of screwing into the hole of the tapping portion, shavings are generated from the inner peripheral surface as the thread forms a screw groove on the inner peripheral surface of the hole. According to said structure, the generated shavings are accommodated in a some groove | channel, and are sent to the front end side of a tapping part with a screwing operation | work.

  In other words, the plurality of grooves serve as escape places for the shavings generated during the screwing operation. Therefore, shavings are less likely to resist the progress of the thread, and the screwing operation can be performed smoothly. As a result, stress acting on the periphery of the hole can be suppressed, and cracks can be prevented. Therefore, it is possible to sufficiently secure the tightening torque of the stud bolt and maintain the fixing strength of the stud bolt with respect to the housing. As a result, the mounting state of the vehicle-mounted parts on the vehicle body is stabilized.

  The shavings sent to the tip side of the tapping portion along the plurality of grooves finally reach the bottom of the hole. In general, the depth of the screwing hole is determined so that a space for accommodating the shavings generated by screwing can be secured between the tip of the tapping portion and the bottom of the hole. According to said structure, since a recessed part accommodates at least one part of shavings, the space | interval of the front-end | tip of a tapping part and the bottom of a hole can be minimized. Since the depth of the hole can be minimized, the in-vehicle component itself can be downsized.

  Or the length dimension of a tapping part can be enlarged when not changing the depth of a hole. In this case, the fixing strength of the stud bolt with respect to the housing can be increased.

  In addition, the stud bolt can be reduced in weight by forming the recess. As a result, it contributes to weight reduction of the vehicle-mounted component and the vehicle on which the vehicle-mounted component is mounted.

  Each of the plurality of grooves is inclined at a first surface inclined at a first angle with respect to the screwing direction of the tapping portion, and at a second angle larger than the first angle with respect to the screwing direction. It is good also as a structure which has the 2nd surface.

  By having the first surface inclined at the first angle, it is possible to suppress resistance to the progress of the thread during the screwing operation. Since the screwing proceeds smoothly, the stress acting around the hole is further suppressed. Further, by having the second surface inclined at the second angle as described above, resistance to the progress of the screw thread in the direction opposite to the screwing direction is increased. Thereby, the tightening torque of the stud bolt can be increased. Since the fixing strength of the stud bolt to the housing can be maintained, the mounting state of the in-vehicle component on the vehicle body is stabilized.

  The plurality of grooves may be arranged at equal intervals in the circumferential direction of the tapping portion. In this case, the load and stress generated by the presence of the plurality of grooves are uniform in the circumferential direction of the tapping portion. Therefore, the posture of the stud bolt during the screwing operation is stabilized, and the oblique insertion into the hole is prevented. Thereby, generation | occurrence | production of the crack around the hole accompanying the diagonal insertion of a stud bolt is prevented, and the fixed strength with respect to the housing of a stud bolt can be maintained. As a result, the mounting state of the vehicle-mounted parts on the vehicle body is stabilized.

  The direction in which the hole extends may be the same as the axial direction of the stud bolt. In this case, the load at the time of screwing into the hole of the tapping portion can be minimized. Thereby, generation | occurrence | production of the crack resulting from the stress which acts on the circumference | surroundings of a hole is prevented, and the fixing strength with respect to the housing of a stud bolt can be maintained. As a result, the mounting state of the vehicle-mounted parts on the vehicle body is stabilized.

  An example of the in-vehicle component is a lighting device mounted on a vehicle. In this case, the housing defines a part of a lamp chamber of the lighting device.

It is a figure which shows the structure of the illuminating device which concerns on one Embodiment of this invention. It is a figure which shows the structure of the stud bolt with which the said illuminating device is provided. It is a figure explaining the method of mounting | wearing with the lighting apparatus of the said stud bolt.

  Exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. In each drawing used in the following description, the scale is appropriately changed to make each member a recognizable size.

  (A) of FIG. 1 is the figure which looked at the illuminating device 1 which concerns on one Embodiment of this invention from the back side. The illuminating device 1 is an example of a vehicle-mounted component, and is a clearance lamp that is attached to a corner of a vehicle and indicates a vehicle width. FIG. 1B is a partial cross-sectional view showing a state where the lighting device 1 is mounted on the vehicle body 2.

  The lighting device 1 includes a housing 11 and a translucent cover 12. The housing 11 and the translucent cover 12 are made of resin, for example. The housing 11 defines a part of the lamp chamber 13. The translucent cover 12 is attached to the housing 11 and closes the lamp chamber 13. A part of the light source 14 is accommodated in the lamp chamber 13. The light emitted from the light source 14 passes through the translucent cover 12 and illuminates the front of the illumination device 1.

  A boss 16 is formed on the back surface 15 of the housing 11. The boss 16 has a cylindrical peripheral wall 16a. The peripheral wall 16a extends from the back surface 15 in the direction opposite to the side on which the translucent cover 12 is provided. A stud bolt 17 is attached to the boss 16.

  For example, a mounting hole is formed in the metal vehicle body 2. As shown in FIG. 1B, for example, a metal stud bolt 17 is fitted into the mounting hole from the outside of the vehicle body 2 and fastened from the inside of the vehicle body 2 with, for example, a metal nut 21, whereby the lighting device 1 is It is attached to the vehicle body 2. From the back surface 15 of the housing 11, the bracket 18 also extends in the direction opposite to the side on which the translucent cover 12 is provided. The bracket 18 is fixed to the vehicle body 2 using an appropriate fixing member (not shown). The lighting device 1 is fixed to the vehicle body 2 in a mounted state by the stud bolt 17 and the bracket 18.

  FIG. 2A is a side view of the stud bolt 17. FIG. 2B is a plan view of the stud bolt 17 viewed from the direction of arrow B in FIG. The stud bolt 17 has a pin portion 71, a flange portion 72, and a tapping portion 73 arranged along the central axis A.

  The pin portion 71 is a cylindrical portion that extends along the central axis A on the first side of the flange portion 72. The pin portion 71 is a portion that is inserted into a hole of the receiving member 21 provided in the vehicle body 2 when the lighting device 1 is mounted on the vehicle body 2.

  The flange portion 72 has a hexagonal shape in plan view. The width of the flange portion 72 in the direction orthogonal to the central axis A is larger than the diameter of the pin portion 71.

  The tapping portion 73 is a cylindrical portion that extends along the central axis A on the second side of the flange portion 72 that is opposite to the first side. The diameter of the tapping portion 73 is larger than the diameter of the pin portion 71 and smaller than the width of the flange portion 72 in the direction orthogonal to the central axis A.

  On the outer peripheral surface of the tapping portion 73, a screw thread 73a extending in a spiral shape is formed. Further, two grooves 73b extending across the thread 73a are formed on the outer peripheral surface of the tapping portion 73. The two grooves 73 b are arranged at equal intervals in the circumferential direction of the tapping portion 73 and extend in a direction parallel to the central axis A.

  Each groove 73b is partitioned by an outer peripheral surface of the tapping portion 73, and a first surface 73b1 and a second surface 73b2 extending in a direction parallel to the central axis A. The first surface 73b1 is inclined at a first angle α1 with respect to the circumferential direction of the tapping portion 73. The second surface 73b2 is inclined at a second angle α2 larger than the first angle α1 with respect to the circumferential direction of the tapping portion 73.

  A recess 73 d is formed on the tip surface 73 c of the tapping portion 73. The recess 73 d is recessed inside the tapping portion 73 along the central axis A.

  As described above, the boss 16 is provided in the housing 11 of the lighting device 1. FIG. 3A is an enlarged longitudinal sectional view showing the boss 16. The cylindrical peripheral wall 16a of the boss 16 defines a hole 16b inside. In the same figure, the code | symbol C has shown the central axis of the hole 16b. The shape of the hole 16b viewed from the direction along the central axis C is circular. The hole 16b has a bottom 16c.

  As shown in FIG. 3B, the stud bolt 17 is attached to the housing 11 by screwing the tapping portion 73 into the hole 16b. An arrow S in FIG. 2B indicates the screwing direction of the stud bolt 17. The inner diameter of the hole 16b is slightly smaller than the outer diameter of the thread 73a. Therefore, when the tapping portion 73 is screwed into the hole 16b, the screw thread 73a forms a thread groove on the inner peripheral surface of the hole 16b. The screwing operation is continued until the flange portion 72 comes into contact with the top surface 16d of the boss 16.

  In the state where the screwing is completed, the recess 73d formed in the tip end surface 73c of the tapping portion 73 faces the bottom 16c of the hole 16b.

  When the tapping portion 73 is screwed into the hole 16b, shavings are generated from the inner peripheral surface as the thread 73a forms a thread groove on the inner peripheral surface of the hole 16b. In the stud bolt 17 of this embodiment, a thread 73a is formed on the outer peripheral surface of the tapping portion 73, and two grooves 73b extend so as to cross the thread 73a. The generated shavings are accommodated in the two grooves 73b, and are sent to the front end surface 73c side with the screwing operation.

  That is, the two grooves 73b serve as escape places for the shavings generated during the screwing operation. Therefore, shavings are less likely to resist the progression of the screw thread 73a, and the screwing operation can be performed smoothly. Thereby, the stress which acts on the peripheral wall 16a of the boss | hub 16 can be suppressed, and generation | occurrence | production of a crack can be prevented. Therefore, it is possible to sufficiently secure the tightening torque of the stud bolt 17 and maintain the fixing strength of the stud bolt 17 with respect to the housing 11. As a result, the mounting state of the lighting device 1 on the vehicle body 2 is stabilized.

  In addition, the shavings sent to the front end side of the tapping part 73 along the two grooves 73b finally reach the bottom 16c of the hole 16b. In the stud bolt 17 of the present embodiment, a recess 73d is formed on the tip surface 73c of the tapping portion 73 that faces the bottom 16c of the hole 16b. Therefore, the shavings sent to the front end side of the tapping part 73 are accommodated in the recessed part 73d.

  In general, the depth of the screwing hole is determined so that a space for accommodating the shavings generated by screwing can be secured between the tip of the tapping portion and the bottom of the hole. According to the structure of this embodiment, since the recessed part 73d accommodates at least one part of shavings, the space | interval of the front end surface 73c and the bottom 16c can be made into the minimum. Since the depth of the hole 16b can be minimized, the size of the boss 16 and thus the lighting device 1 itself can be reduced in size.

  Alternatively, when the depth of the hole 16b is not changed, the length dimension of the tapping portion 73 can be increased. In this case, the fixing strength of the stud bolt 17 with respect to the housing 11 can be increased.

  Further, the formation of the recess 73d can reduce the weight of the stud bolt 17. As a result, it contributes also to weight reduction of the illuminating device 1 and the vehicle in which the illuminating device 1 is mounted.

  In the stud bolt 17 of the present embodiment, each groove 73b has a first surface 73b1 that is inclined at a first angle α1 with respect to the circumferential direction of the tapping portion 73, that is, the screwing direction S.

  Therefore, it is possible to suppress resistance to the progress of the thread 73a during the screwing operation. Since the screwing proceeds smoothly, the stress acting on the peripheral wall 16a of the boss 16 can be further suppressed. Therefore, the generation of cracks around the hole 16b is prevented, and the fixing strength of the stud bolt 17 to the housing 11 can be maintained. As a result, the mounting state of the lighting device 1 on the vehicle body 2 is stabilized.

  In the stud bolt 17 of the present embodiment, each groove 73b has a second surface 73b2 that is inclined at a second angle α2 larger than the first angle α1 with respect to the circumferential direction of the tapping portion 73, that is, the screwing direction S. doing.

  Therefore, the resistance to the progression of the screw thread 73a in the direction opposite to the screwing direction S is increased. Thereby, the tightening torque of the stud bolt 17 can be increased. Since the fixing strength of the stud bolt 17 to the housing 11 can be maintained, the mounting state of the lighting device 1 on the vehicle body 2 is stabilized.

  In the stud bolt 17 of the present embodiment, the two grooves 73 b are arranged at equal intervals in the circumferential direction of the tapping portion 73.

  In this case, the load and stress generated due to the presence of the two grooves 73 b are uniform in the circumferential direction of the tapping portion 73. Therefore, the posture of the stud bolt 17 during the screwing operation is stabilized, and the oblique insertion into the hole 16b is prevented. Thereby, generation | occurrence | production of the crack in the circumference | surroundings of the hole 16b accompanying the diagonal insertion of the stud bolt 17 is prevented, and the fixed strength with respect to the housing 11 of the stud bolt 17 can be maintained. As a result, the mounting state of the lighting device 1 on the vehicle body 2 is stabilized.

  In the illumination device 1 of the present embodiment, the direction in which the hole 16b extends (that is, the direction of the central axis C) matches the direction of the central axis A of the stud bolt 17.

  In this case, the load at the time of screwing into the hole 16b of the tapping portion 73 can be minimized. As a result, the occurrence of cracks due to stress acting around the hole 16b is prevented, and the fixing strength of the stud bolt 17 to the housing 11 can be maintained. As a result, the mounting state of the lighting device 1 on the vehicle body 2 is stabilized.

  The above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit of the present invention, and it is obvious that the present invention includes equivalents thereof.

  The hole 16b into which the tapping portion 73 is screwed does not necessarily need to be partitioned by the boss 16 inside the peripheral wall 16a. The hole formed in the solid part of a vehicle body and opening to the surface of the said vehicle body may be sufficient.

  The direction in which the groove 73b formed on the outer peripheral surface of the tapping portion 73 extends does not necessarily need to be parallel to the central axis A of the stud bolt 17. The direction may be non-parallel to the central axis A as long as it extends across the thread 73a.

  The number of grooves 73b is not limited to two. As long as the tapping portions 73 are arranged at equal intervals in the circumferential direction, three or more grooves may be formed.

  The lighting device 1 is not limited to a clearance lamp. As long as the housing 11 to which the stud bolt 17 is attached defines a part of the lamp chamber 13, the present invention can be applied to an appropriate lighting device mounted on a vehicle.

  The housing 11 to which the stud bolt 17 is attached is not necessarily required to be a part of the lighting device. The present invention can be applied to an appropriate on-vehicle component mounted on the vehicle body 2 using the stud bolt 17.

  1: lighting device, 11: housing, 13: lamp chamber, 16b: hole, 16c: bottom, 17: stud bolt, 73: tapping part, 73a: screw thread, 73b: groove, 73b1: first surface of the groove, 73b2: second surface of groove, 73c: tip surface of tapping portion, 73d: recess, A: central axis of stud bolt, C: central axis of hole, S: screwing direction, α1: first angle, α2: first 2 angles

Claims (6)

A housing formed with a hole having a bottom;
A stud bolt having a tapping portion with a thread formed on the outer peripheral surface ;
Equipped with a,
A plurality of grooves are formed on the outer peripheral surface so as to cross the thread,
The inner peripheral surface of the hole is configured to generate a shaving by generating shavings by the thread when the tapping portion is screwed into the hole,
A vehicle-mounted component in which a recess for receiving the shavings is formed on a surface of the tapping portion facing the bottom.   The in-vehicle component according to claim 1, wherein the plurality of grooves extend in parallel with a center axis of the stud bolt and send the shavings to the bottom.   A housing formed with a hole having a bottom;
  A stud bolt having a tapping portion with a thread formed on the outer peripheral surface;
With
  The inner peripheral surface of the hole is configured to generate a shaving by generating shavings by the thread when the tapping portion is screwed into the hole,
  A plurality of grooves for sending the shavings toward the bottom are formed on the outer peripheral surface so as to cross the thread.
  The plurality of grooves are in-vehicle parts extending in parallel with a central axis of the stud bolt. Each of the plurality of grooves is inclined at a first surface inclined at a first angle with respect to the screwing direction of the tapping portion, and at a second angle larger than the first angle with respect to the screwing direction. The in-vehicle component according to any one of claims 1 to 3 , further comprising a second surface. 5. The vehicle-mounted component according to claim 1, wherein the plurality of grooves are arranged at equal intervals in a circumferential direction of the tapping portion. The in-vehicle component according to any one of claims 1 to 5 , wherein the housing defines a part of a lamp chamber of a lighting device.

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