JPH0718270U - Mechanical ignition type sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a mechanical ignition type sensor capable of surely and smoothly operating and releasing a safety device without impairing stable operability. [Structure] The ignition pin 22 is held by a trigger lever 34, and the inertial mass body 30 abuts on and holds a slide holding portion 40 of the trigger lever 34. When the inertial mass body 30 moves due to inertial force, the trigger lever 3
4 is rotated and the holding of the ignition pin 22 is released. The holding portion 41 of the trigger lever 34 includes the inclined surface 5 of the safety lever 50.
4 is engaged to prevent its rotation, and the rotation prevention can be released by moving in the axial direction. Since the inclined surface 54 and the holding portion 41 are in contact with each other in an inclined state, the two relatively move while sliding smoothly, and there is no unnecessary interference such as being caught. Therefore, the safety lever 50 can be smoothly operated to bring it into the operating state and the released state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanical ignition sensor for detecting a sudden deceleration state of a vehicle.

[0002]

[Prior art]

 For example, in a seatbelt device installed in a vehicle, the webbing mounted on the occupant is pulled back by a predetermined amount when the vehicle suddenly decelerates to forcibly remove the slack of the webbing for the occupant and tighten the webbing to improve the occupant restraint. Some are equipped with a so-called pretensioner.

In this type of pretensioner, there are a pretensioner configured to forcibly rotate the take-up shaft of the webbing retractor to tension the webbing and a pretensioner configured to tension the webbing by forcibly pulling the buckle. However, for example, in a structure in which the webbing is tensioned by pulling a buckle, a gas generator equipped with a mechanical ignition sensor is provided. A cylinder is arranged in this gas generator and is connected to the buckle via a wire or the like.

When the vehicle suddenly decelerates, this is detected by the mechanical ignition type sensor, the gas generator is activated, gas is instantaneously generated and the cylinder is moved, and this moving force is transmitted to the buckle via the wire. The buckle is forcibly moved and the webbing is strained.

Here, the mechanical ignition type sensor used in such a pretensioner basically has an ignition pin for igniting a detonator, an inertial body that inertially moves by a large acceleration, and an ignition pin and an inertial body. Although it is composed of a trigger member for interfering with the movement of the ignition pin, it is further provided with a safety device for preventing a malfunction when the mechanical ignition sensor is assembled.

This safety device is equipped with a safety lever that engages with the inertial body that moves due to inertial force and prevents the movement thereof regardless of the action of inertial force. When the safety lever is engaged with the inertial body, the inertial body is forcibly prevented from moving as described above. The sensor is prevented from malfunctioning.

[0007]

[Problems to be solved by the device]

 By the way, the safety device (safety lever) of the conventional mechanical ignition type sensor having the above-mentioned structure needs to operate surely, and the operation thereof needs to be performed smoothly and surely. For example, when checking the operation sensitivity of the mechanical ignition sensor and performing an operation inspection to confirm whether it operates reliably, the sensor can be operated once by operating the safety lever (safety device released state). As a result, an operation inspection is carried out, and then, when the gas generator is properly assembled, it is necessary to make the sensor inoperative (safety device operating state) again by operating the safety lever. That is, the safety lever provided on the mechanical ignition sensor must be able to be reliably operated in the operating state and the released state, and must be able to perform the operation smoothly.

In this respect, it is difficult for the conventional safety device (safety lever) to be operated again (operable state of the sensor) after being operated in the released state, and the operation is complicated and smooth. There is room for improvement, such as difficulty in achieving it, and measures for this have been eagerly awaited.

In consideration of the above facts, an object of the present invention is to provide a mechanical ignition type sensor which can surely and smoothly operate and release the safety device without impairing stable operability.

[0010]

[Means for Solving the Problems]

 The mechanical ignition sensor of the invention according to claim 1 is arranged so as to be movable along the axial direction, and is ignited by an igniting pin that moves axially by the biasing force of a firing spring to ignite a detonator and a bias spring. In the direction in which the inertial quantity body is biased and moves against the biasing force of the bias spring due to the inertial force when a predetermined load is applied, and the ignition pin and the inertial mass body are brought into contact with and separated from the ignition pin by a spindle. It is rotatably supported and has an engaging portion that engages with the ignition pin. Normally, the engaging portion engages with the ignition pin and is pressed by the inertial mass body to move around the support shaft. With the rotation blocked, the ignition pin is pressed by the ignition pin in a direction away from the ignition pin, and the ignition pin is applied to the urging force of the firing ring. Then, it is held at a position separated from the detonator, and when the inertial mass is moved, the rotation blocking by the inertial mass is released and the ignition pin can be moved by rotating in the direction away from the ignition pin. And the trigger lever, which is located corresponding to the trigger lever end portion on the side opposite to the engaging portion with respect to the support shaft, is arranged so as to be movable in the axial direction of the ignition pin, and is attached to the trigger lever end portion. There is an inclined surface that is in contact with and is inclined with respect to the moving direction along the axis of the ignition pin. Normally, the inclined surface is engaged with the end portion of the trigger lever and the support of the trigger lever is provided. By blocking rotation around the axis and moving along the axial direction of the ignition pin, the inclined surface becomes disengaged from the trigger lever, and the trigger lever can rotate around the support shaft. With a safety lever It is equipped with a.

[0011]

[Action]

 In the mechanical ignition sensor according to claim 1, normally, the ignition pin is located at a position separated from the detonator against the urging force of the firing spring, and the inertial mass body enters the pivot locus of the trigger lever by the bias spring. In addition, the trigger lever holds the ignition pin in a state in which the engagement part engages with and holds the ignition pin in the state of rotating in the direction of approaching the ignition pin, and the inertial mass prevents rotation of the trigger lever. Has been maintained.

Further, in the safety device operating state (sensor inoperative state), the inclined surface of the safety lever engages with the end portion of the trigger lever to prevent the trigger lever from rotating around the support shaft. Therefore, in this state, even if a large acceleration acts on the mechanical ignition sensor and the inertial mass body moves inertially, the trigger lever does not rotate and the ignition pin holding state is not released. .

On the other hand, when the safety lever is moved along the axis of the ignition pin, the inclined surface of the safety lever separates from the end of the trigger lever and becomes disengaged so that the trigger lever can rotate about the spindle. The safety device is not activated (sensor is operable).

In this state, when a large acceleration acts on the mechanical ignition type sensor, the inertial mass body inertially moves and separates from the rotation locus of the trigger lever. As a result, the holding of the trigger lever by the inertial mass is released, and the trigger lever pressed by the firing pin urged by the firing spring in the direction away from the ignition pin rotates in the direction away from the ignition pin. Move. As a result, the holding of the ignition pin by the engaging portion of the trigger lever is released, and the ignition pin moves in the axial direction by the urging force of the firing spring to ignite the detonator.

Here, in the mechanical ignition sensor according to the present invention, the inclined surface of the safety lever that contacts the end of the trigger lever is formed to be inclined with respect to the moving direction along the axis of the ignition pin. The movement of the safety lever in either the operating direction or the releasing direction can be smoothly performed. For example, even when the safety lever is moved from the safety device operating state to the safety device released state and then moved in the opposite direction again to return to the safety device operating state, the inclined surface of the safety lever and the trigger lever are And are engaged while sliding smoothly, and there is no unnecessary interference such as being caught.

Therefore, the safety lever can be smoothly operated to surely bring the safety device into the operating state and the safety device releasing state.

[0017]

【Example】

 1 and 3 are sectional views of a mechanical ignition sensor 10 according to an embodiment of the present invention.

The mechanical ignition sensor 10 includes a case 12. The case 12 is formed in a cylindrical shape having a bottom wall 14 at one end, and a plate 16 is fixed and sealed on the opening side. A through hole 18 is formed in the bottom wall 14 of the case 12 on the axis, and a substantially cylindrical guide 20 is formed in the bottom wall 14 so as to project coaxially toward the inside of the case 12. ing.

An ignition pin 22 is arranged inside the case 12. The ignition pin 22 is composed of a main body 24 formed in a substantially cylindrical shape, and a convex portion 26 integrally formed to project from a bottom wall 24A of the main body 24. The outer diameter of the main body 24 corresponds to the inner diameter of the guide 20, and the main body 24 can be inserted into the guide 20 by sliding in the case 12 along the axis. On the other hand, the convex portion 26 projects to the outside from the through hole 18 formed in the bottom wall 14 when the ignition pin 22 (main body 24) is moved to the side of the bottom wall 14 of the case 12 most.

An inner wall 13 is provided in the longitudinal middle portion of the case 12, and a firing spring 28 is arranged between the ignition pin 22 and the inner wall 13 to keep the ignition pin 22 transparent. It is biased toward the hole 18.

On the other hand, an inertial mass body 30 is arranged around the guide 20. The inertial mass body 30 is formed in a substantially cylindrical shape and is movably accommodated between the peripheral wall of the case 12 and the guide 20. A bias spring 32 is arranged between the inertial mass body 30 and the inner wall 13 to constantly urge the inertial mass body 30 toward the bottom wall 14.

A trigger lever 34 is arranged between the inertial mass body 30 and the ignition pin 22. The trigger lever 34 is rotatably supported by a shaft 36 at an intermediate portion in the longitudinal direction. Further, the tip of the trigger lever 34 is bent toward the ignition pin 22 to form an engaging portion 38, which can be engaged with the ignition pin 22. That is, by rotating the trigger lever 34 around the shaft 36, the engaging portion 38 can approach or separate from the ignition pin 22. When the engagement portion 38 of the trigger lever 34 is engaged with the body 24 of the ignition pin 22, the ignition pin 22 urged by the firing spring 28 is pulled out from the through hole 18 by the protrusion 26 thereof. keeping.

A slide holding portion 40 is formed so as to project toward the inertial mass body 30 on the opposite side of the ignition lever 22 near the tip of the trigger lever 34. The slide holding portion 40 corresponds to the slide portion 31 formed on the inertial mass body 30 and is configured to linearly contact the slide portion 31. That is, normally, the inertial mass body 30 is located at the position closest to the bottom wall 14 of the case 12 by the bias spring 32. In this state, the sliding portion 31 of the inertial mass body 30 is moved to the slide holding portion 40 of the trigger lever 34. The engaging portion 38 of the trigger lever 34 is engaged with the main body 24 of the ignition pin 22 to hold the ignition pin 22 at the position where the projection 26 of the ignition pin 22 is pulled out from the through hole 18. Has become. Further, when the inertial mass body 30 moves in the direction away from the bottom wall 14, the slide part 31 of the inertial mass body 30 moves relatively while linearly contacting the slide holding part 40 of the trigger lever 34. is there.

On the other hand, the rear end of the trigger lever 34 (the end opposite to the engaging portion 38) penetrates the inner wall 13 to reach the vicinity of the plate 16, and as shown in FIG. A holding portion 41 is formed so as to project toward the axis of the ignition pin 22. A safety lever 50 is arranged near the holding portion 41.

As shown in FIG. 2, the safety lever 50 is formed in a disc shape, and the shaft portion 52 is integrally fixed to the shaft core portion. Further, a tapered inclined surface 54 is formed on the peripheral surface of the safety lever 50. With the inclined surface 54 corresponding to the holding portion 41 of the trigger lever 34, the shaft portion 52 serves as the ignition pin 22. It is located on the same axis and is supported by the plate 16 so as to be movable along the axis. Further, the shaft portion 52 can be operated from the outside by a releasing device or the like (not shown). Further, a return spring 56 is arranged between the safety lever 50 and the inner wall 13 so that the safety lever 50 is always in the direction of the plate 16 (that is, the inclined surface 54 is engaged with the holding portion 41 of the trigger lever 34). Direction).

In the safety lever 50, the inclined surface 54 is normally engaged with the holding portion 41 of the trigger lever 34 by the urging force of the return spring 56 to prevent the trigger lever 34 from rotating around the shaft 36. . On the other hand, when the shaft portion 52 of the safety lever 50 is operated from the outside and is moved in the direction of the ignition pin 22 along the axis against the biasing force of the return spring 56, the inclined surface 54 separates from the holding portion 41. The trigger lever 34 is disengaged from the trigger lever 34 so that the trigger lever 34 can rotate about the shaft 36.

The mechanical ignition type sensor 10 having the above-described configuration is attached to, for example, a gas generator (not shown) for a pretensioner. The gas generator contains a gas generating agent, and further, a detonator 42 for igniting and burning the gas generating agent is arranged. The detonator 42 is located on the axis of the mechanical ignition type sensor 10 in a state where the mechanical ignition type sensor 10 is assembled. Therefore, in this assembled state, the through hole 18 of the case 12 faces the detonator 42, and the projection 26 of the ignition pin 22 that can project from the through hole 18 can collide with the detonator 42.

Next, the operation of this embodiment will be described. In the mechanical ignition sensor 10 of the present embodiment configured as described above, normally, as shown in FIG. 1, the ignition pin 22 is separated from the detonator 42 against the urging force of the firing spring 28 ( At a position where the trigger lever 34 is pulled out from the through hole 18 of the case 12, the engagement portion 38 of the trigger lever 34 is engaged with the main body 24 of the ignition pin 22 to hold the ignition pin 22. Further, the inertial mass body 30 enters the position closest to the bottom wall 14 by the bias spring 32, that is, the rotation locus of the trigger lever 34, and the slide portion 31 contacts the slide holding portion 40 of the trigger lever 34. The rotation of the trigger lever 34 is blocked to maintain the ignition pin holding state.

Further, in the safety device operating state (sensor inoperative state), the inclined surface 54 of the safety lever 50 engages with the holding portion 41 of the trigger lever 34 as shown in FIG. The rotation around 36 is blocked. Therefore, in this state, even if a large acceleration acts on the mechanical ignition sensor 10 and the inertial mass body 30 inertially moves (the slide part 31 moves relative to the slide holding part 40 of the trigger lever 34 and is separated from the slide holding part 40). However, the trigger lever 34 does not rotate and the ignition pin holding state is not released.

On the other hand, the shaft portion 52 of the safety lever 50 is operated from the outside to move in the direction of the ignition pin 22 (direction of arrow A in FIGS. 1 and 2) along the axis against the biasing force of the return spring 56. Then, as shown in FIG. 4, the inclined surface 54 separates from the holding portion 41 and becomes disengaged with the trigger lever 34, and the trigger lever 34 can be rotated around the shaft 36. It becomes possible state).

Here, when a large acceleration acts on the mechanical ignition sensor 10, the inertial mass body 30 inertially moves in the direction of arrow B in FIG. 1 and separates from the rotation locus of the trigger lever 34.

In this case, the inertial mass body 30 (slide portion 31) moves while linearly contacting the slide holding portion 40 of the trigger lever 34. When the slide holding portion 40 of the trigger lever 34 is separated from the slide portion 31 of the inertial mass body 30 and the holding is released, the slide holding portion 40 is separated from the ignition pin 22 by the ignition pin 22 biased by the firing spring 28. The trigger lever 34 pressed in the direction is rotated in the direction away from the ignition pin 22. As a result, the engaging portion 38 of the trigger lever 34 is separated from the main body 24 of the ignition pin 22 to release the holding of the ignition pin 22, so that the ignition pin 22 is axially moved by the urging force of the firing spring 28. Then, the convex portion 26 projects outward from the through hole 18 (state shown in FIG. 3).

As a result, the convex portion 26 of the ignition pin 22 collides with the detonator 42, and the detonator 42 is ignited. When the detonator 42 is ignited, the gas generating agent of the gas generator is ignited and combusted, for example, the pretensioner is operated.

Here, in the mechanical ignition sensor 10 according to the present embodiment, the holding portion 41 of the trigger lever 34 and the inclined surface 54 of the safety lever 50 that comes into contact with the holding portion 41 move in the moving direction along the axis of the ignition pin 22. Since the safety lever 50 is formed so as to be inclined, the movement of the safety lever 50 in either the operating direction or the releasing direction can be smoothly performed.

For example, after moving the safety lever 50 from the operating state of the safety device shown in FIGS. 1 and 2 in the direction of arrow A in FIGS. 1 and 2 to the safety device releasing state (the state shown in FIG. 4), Even when the safety device is activated again by moving it in the opposite direction (arrow C in FIG. 4), the inclined surface 54 of the safety lever 50 and the holding portion 41 of the trigger lever 34 slide smoothly. The safety device operating state shown in FIG. 2 is restored again without unnecessary interference such as engagement and catching. Therefore, the safety lever 50 can be smoothly operated to surely bring the safety device operating state and the safety device releasing state.

In the mechanical ignition sensor 10 of the above-described embodiment, the safety lever 50 formed in the shape of a disk is formed with the inclined surface 54 that inclines in a tapered shape over the entire circumference. However, the safety lever 60 shown in FIG. 5 may be provided with an inclined surface 62 that is partially inclined around its peripheral surface. Even in this case, by disposing the inclined surface 62 of the safety lever 60 so as to correspond to the holding portion 41 of the trigger lever 34, the inclination of the safety lever 60 in both the operating direction and the releasing direction can be increased. The surface 62 and the holding portion 41 of the trigger lever 34 are smoothly slidably engaged with each other, and the safety lever 60 is smoothly operated without causing unnecessary interference such as catching, thereby reliably operating the safety device and releasing the safety device. It can be in a state.

Further, in the mechanical ignition sensor 10 in the above-mentioned embodiment, the ignition pin 22 is held by one trigger lever 34, but the number of trigger levers 34 is not limited to this. Two or more may be provided.

Further, although the mechanical ignition type sensor 10 in the above-mentioned embodiment is used for the gas generator for the pretensioner, it is not limited to this, and it is naturally applicable to other devices that operate by collision of the ignition pin 22. Is possible.

[0039]

[Effect of device]

 As described above, the mechanical ignition sensor according to the present invention has an excellent effect that the operating operation and the releasing operation of the safety device can be performed reliably and smoothly without impairing the stable operability.

[Brief description of drawings]

FIG. 1 is a sectional view showing an initial state of a mechanical ignition sensor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a shape of a safety lever and a relationship with a trigger lever of a mechanical ignition type sensor according to an embodiment of the present invention and showing a state in which both are engaged.

FIG. 3 is a cross-sectional view showing a state after the mechanical ignition sensor according to the embodiment of the present invention is activated.

FIG. 4 is a view when the safety lever and the trigger lever of the mechanical ignition type sensor according to the embodiment of the present invention are disengaged.
It is a perspective view corresponding to.

FIG. 5 is a perspective view showing another example of the safety lever of the mechanical ignition sensor according to the embodiment of the present invention.

[Explanation of symbols]

 10 Mechanical Ignition Sensor 22 Ignition Pin 28 Firing Spring 30 Inertial Mass Body 32 Bias Spring 34 Trigger Lever 38 Engagement Part 41 Holding Part 42 Detonator 50 Safety Lever 54 Slope 60 Safety Lever 62 Slope

Claims (1)

[Scope of utility model registration request] 1. Arranged so as to be movable along the axial direction,
An ignition pin that moves in the axial direction by the biasing force of the firing spring to ignite the detonator, and an inertial mass body that is always biased by the bias spring and that moves by the inertial force against the biasing force of the bias spring when a predetermined load is applied. And an engaging portion that is rotatably supported by a support shaft between the ignition pin and the inertial mass body in a direction of coming into contact with and separating from the ignition pin, and has an engaging portion that engages with the ignition pin. A state in which a portion engages with the ignition pin and is pressed by the inertial mass body to prevent rotation around the support shaft, and is pressed by the ignition pin in a direction away from the ignition pin. As it is, the ignition pin is held at a position separated from the detonator against the biasing force of the firing spring, and the inertia mass body is moved when the inertia mass body moves. A trigger lever which is released from the rotation prevention by the rotation and rotates in a direction away from the ignition pin to enable movement of the ignition pin; and an end portion of the trigger lever opposite to the engaging portion with respect to the support shaft. Corresponding to the ignition pin, is movably arranged in the axial direction of the ignition pin, and has an inclined surface that is in contact with the end portion of the trigger lever and is inclined with respect to the movement direction along the axial line of the ignition pin. However, normally, the inclined surface is engaged with the end portion of the trigger lever to prevent rotation of the trigger lever around the support shaft, and the inclined surface is moved by moving in the axial direction of the ignition pin. A mechanical ignition sensor comprising: a safety lever that is disengaged from the trigger lever and is capable of rotating the trigger lever around the support shaft.