JP4236110B2 - Crew restraint device for motorcycles - Google Patents

Description

  The present invention relates to an occupant restraining device for a two-wheeled vehicle, and more particularly to an occupant restraining device for a two-wheeled vehicle that restricts movement of the occupant forward of a vehicle body.

In a motorcycle, as a technique for restraining a passenger from moving forward in the vehicle body, Patent Document 1 discloses a technique in which an airbag is disposed near a meter panel of a motorcycle, and an airbag is activated by detecting an impact. Yes.
JP-A-11-278342

  In the technique of Patent Document 1, a space for mounting the airbag unit and its control unit must be secured in the vicinity of the meter panel, and an acceleration sensor must be attached to the vehicle body frame. Application of was difficult.

  An object of the present invention is to solve the above-described problems of the prior art, and to provide an occupant restraint device for a two-wheeled vehicle that can be easily applied to a small vehicle and can reduce a load applied to the occupant without increasing the size of a pad. It is in.

In order to achieve the above-described object, the present invention is characterized in that the following measures are taken in an occupant restraint device that restricts movement of the occupant of a two-wheeled vehicle forward of the vehicle body.
(1) A head pipe that supports the steering handle freely and an occupant restraining pad are mounted on one end, and a pipe-shaped pad support member that is a separate member from the head pipe, and the occupant restraining pad faces the occupant. A connecting member for connecting and fixing the other end of the pad support member to the head pipe, and a load absorbing member for absorbing a forward load applied to the occupant restraining pad and limiting plastic deformation of the pad support member. It is characterized by including.
(2) The load absorbing member is a crush preventing member that limits crushing deformation of the pad support member.
(3) The load absorbing member is an elastic member inserted through a plastic deformation portion of a pad support member.
(4) The load absorbing member is a coil spring inserted through the plastic deformation portion of the pad support member.
(5) The load absorbing member is a bellows-like collapsible body formed on the pad support member.
(6) The connection member includes a pipe-like connection bar that is vertically connected to the other end of the pad support member and extends in the left-right direction of the vehicle body, and a support member that supports the connection bar at both ends. The load absorbing portion is an elastic member that is inserted through the inside of the connecting bar and restricts torsional deformation of the connecting bar.
(7) The present invention is characterized in that a reinforcing member for limiting the forward tilt amount of the pad support member is further provided.

(1) According to the invention of claim 1, a part of the load applied to the passenger restraining pad is consumed and absorbed by the load absorbing member, and the plastic deformation of the pad supporting member is restricted. Therefore, even when a forward load is applied to the occupant restraining pad so that the stress applied to the pad support member exceeds the elastic limit, the occupant can be reliably restrained by receiving this load.
(2) According to the invention of claim 2, the plastic deformation can be easily restricted without performing special processing or the like on the pad support member.
(3) According to the inventions of claims 3, 4 and 5, the plastic deformation of the handle connecting member can be limited only by adding an elastic member, a coil spring or a bellows-like collapsible body.
(4) According to the invention of claim 6, in the configuration in which the pad support member is given elasticity by using the torsional stress of the connection bar, the plastic deformation of the connection bar can be easily limited.
(5) According to the invention of claim 7, since the forward tilting amount of the handle connecting member is limited, the position of the stop pad can be maintained at a predetermined height or more.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a scooter type motorcycle to which an occupant restraint device according to the present invention is applied. A vehicle body frame 10 includes a main frame pipe 12 having a head pipe 11 fixed to a front end portion thereof, and the main frame pipe 12. A cross pipe 13 fixed at right angles and horizontally to the rear end portion and a pair of left and right rear frame pipes 14 (14L, 14R) having front ends connected to both ends of the cross pipe 13 are mainly configured. .

  The main frame pipe 12 includes a down frame portion 12a inclined downward from the head pipe 11 and a lower frame portion 12b extending substantially rearward from the rear end of the down frame portion 12a. Composed. The cross pipe 13 extends in the left-right direction of the vehicle body frame 10, and a rear end portion of the main frame pipe 12 is fixed to the central portion of the cross pipe 13 at a right angle. The pair of left and right rear frame pipes 14 includes a rise frame portion 14a that extends rearward and upward from both ends of the cross pipe 13, a rear end that is substantially horizontal from the rear end of the rise frame portion 14a, and a rear end opening. An upper frame portion 14b that bends in a horizontal plane so as to face each other is integrally connected.

  A front fork 15 that supports the front wheel Wf is supported on the head pipe 11 so as to be steerable. A steering handle 16 is connected to the upper end of the front fork 15 via a handle pipe 20. At the front part of the rear frame pipe 14, a power unit P comprising an engine E disposed on the front side of the rear wheel Wr and a continuously variable transmission M disposed on the left side of the rear wheel Wr is provided in the vertical direction. The rear wheel Wr is pivotally supported on the rear portion of the power unit P. An air cleaner 29 is disposed on the upper left side of the rear wheel Wr.

  A rear suspension unit 17 is provided between the rear portion of the power unit P and the left rear frame pipe 14L. An exhaust pipe 18 that guides exhaust gas from the engine E extends from the engine E to the right side of the rear wheel WR, and the exhaust pipe 18 is connected to an exhaust muffler 19 that is arranged on the right side of the rear wheel Wr. Has been. A storage box 25 is supported between the front portions of the left and right rear frame pipes 14 so as to be disposed above the engine E.

  The vehicle body frame 10 is covered with a vehicle body cover 21 made of synthetic resin. The vehicle body cover 21 includes a leg shield 22 that covers the front of the occupant's feet, and a step floor 23 that is continuous with the lower portion of the leg shield 22 to place the occupant's feet. And a side cover 24 that is connected to the step floor 23 and covers the rear part of the vehicle body from both sides.

  The storage box 25 and the fuel tank (not shown) are covered with the side cover 24, and a seat 26 that covers the storage box 25 from above is attached to the top of the side cover 24 so as to be openable and closable. That is, the step floor 23 is formed on the vehicle body cover 21 so as to be disposed between the steering handle 16 and the seat 26 so that the power unit P can swing on the vehicle body frame 10 below the rear end of the step floor 23. A frame side bracket 27 for supporting is arranged. A connecting member 41 is attached to the front portion of the head pipe 11, and a flexible pad support pipe 40 is attached to the connecting member 41 so as to be directed obliquely rearward and upward along the handle pipe 20. It is connected and fixed at the lower end.

  Referring also to FIG. 2, a plate member 31 is fixed to one upper end of the pad support pipe 40, and an occupant restraining pad 30 is attached to the plate member 31 so as to face an occupant seated on the seat 26. ing. As shown in FIG. 3, even if the occupant moves forward due to inertia during braking or the like, the occupant restraining pad 30 holds the occupant in the vicinity of the chest with the restraining pad 30 and prevents further movement. Therefore, the forward movement of the occupant is limited within a predetermined range. In the present embodiment, when a forward load exceeding a predetermined reference value is applied to the stop pad 30, a load absorbing portion that absorbs this and relaxes the load applied to the occupant is added to the pad support pipe 40. Yes.

  FIG. 4 is a cross-sectional view of the first embodiment of the load absorbing portion and an enlarged cross-sectional view of the main portion thereof, and the same reference numerals as those described above represent the same or equivalent portions.

  A plate-like stay 44a is erected and fixed to the front part of the head pipe 11 by welding, and the plate-like stay 44b is erected and fixed to the rear part of the head pipe 11 by welding. ing. The connecting member 41 is fastened by bolts 51 and 52 to the two stays 44a and 44b. The pad support pipe 40 has a side surface in the vicinity of the lower end thereof sandwiched between the front end 44c of the stay 44a and the front inner wall surface 41a of the connecting member 41, and extends rearward and obliquely upward. The lower open end of the pad support pipe 40 is supported so as to be inserted through the projection portion of the support member 43 having an annular projection portion.

  The occupant restraining pad 30 is positioned and fixed to the upper end of the pad support pipe 40 by a bolt 52 so as to face the occupant's chest through a plate member 31. A longitudinal elastic member 32 is inserted inside the lower end of the pad support pipe 40.

  In such a configuration, when a forward load exceeding a predetermined reference value is applied to the stop pad 30, the pad support pipe 40 starts to bend. When the stress exceeds the yield point (elastic limit) of the pad support pipe 40, plastic deformation starts, and the pad support pipe 40 is crushed near the upper surface of the connecting member 41 and begins to bend forward as shown by the broken line in FIG. .

  FIG. 10 is a diagram showing the relationship between the amount of forward movement of the restraining pad 30 and the load applied to the chest of the occupant. If the elastic member 32 is not inserted through the pad support pipe 40, FIG. As shown by the broken line in FIG. 6, since the pad support pipe 40 is broken or crushed when the stress exceeds the yield point, and the elasticity cannot be maintained, the load applied to the stop pad 30 escapes.

  On the other hand, in this embodiment, the pad support pipe 40 and the connecting member 41 are firmly connected, and the longitudinal elastic member 32 prevents the pad support pipe 40 from being crushed and restricts plastic deformation. Therefore, even in the plastic region beyond the yield point, the pad support pipe 40 can maintain elasticity without being broken or crushed. Therefore, the relationship between the amount of forward movement of the restraining pad 30 and the load applied to the occupant's chest is kept substantially constant after the pad support pipe 40 exceeds the yield point, as shown by the solid line in FIG. Therefore, even when a load exceeding the elastic limit of the pad support pipe 40 is applied to the restraining pad 30, the occupant is reliably restrained, and a load applied to the occupant's chest is continuously absorbed while part of the load is absorbed. Can be reduced.

  FIG. 5 is a cross-sectional view of a second embodiment of the load absorbing portion, where the same reference numerals as those described above represent the same or equivalent portions.

  A connecting member 41 is fastened to the front portion of the head pipe 11 by bolts 51, 51 as in the first embodiment. By this connecting member 41, the pad support pipe 40 having flexibility is supported in a rearward and obliquely upward direction. A coil spring 33 is inserted inside the lower end of the pad support pipe 40 in place of the elastic member 32.

  In such a configuration, when a forward load exceeding a predetermined reference value is applied to the stop pad 30, the pad support pipe 40 starts to bend. When the stress exceeds the elastic limit of the pad support pipe 40, plastic deformation starts, and the pad support pipe 40 begins to bend forward near the upper surface of the connecting member 41. However, in this embodiment, since the coil spring 33 is inserted inside the bent portion of the handle pipe 20, the handle pipe 20 maintains elasticity without being broken or crushed even if it exceeds its yield point. become able to. Therefore, even when a load exceeding the elastic limit of the pad support pipe 40 is applied to the restraining pad 30, the occupant can be reliably restrained, and a part of the load can be continuously absorbed to reduce the load applied to the occupant's chest. it can.

  FIG. 6 is a cross-sectional view of a third embodiment of the load absorbing portion, and the same reference numerals as those described above represent the same or equivalent portions.

  A connecting member 41 is fastened to the front portion of the head pipe 11 by bolts 51 and 51 as in the above-described embodiments. By this connecting member 41, the pad support pipe 40 having flexibility is supported in a rearward and obliquely upward direction. A coil spring 33 is inserted inside the lower end of the pad support pipe 40 in place of the elastic member 32. A bellows-like collapsible body 34 is formed in the vicinity of the upper surface of the connecting member 41 of the pad support pipe 40.

  In such a configuration, when a forward load exceeding a predetermined reference value is applied to the stop pad 30, the pad support pipe 40 starts to bend. When the stress exceeds the stress limit of the bellows-like collapsible body 34, the front side of the bellows-like collapsible body 32 is crushed and plastic deformation in which the rear side is extended starts, and the handle pipe 20 begins to bend forward.

  As described above, in the present embodiment, the handle pipe 20 is provided with the bellows-like collapsible body 32. Therefore, even after the plastic deformation starts, the handle pipe 20 can maintain elasticity without breaking. Therefore, even when a load exceeding the stress limit of the pad support pipe 40 is applied to the restraining pad 30, the occupant can be reliably restrained, and a part of the load can be continuously absorbed to reduce the load applied to the occupant's chest. it can.

  By the way, in each above-mentioned embodiment, since the pad support pipe 40 bends using the vicinity of a lower end part as a fulcrum, the position will become low as the movement amount of the stop pad 30 becomes large. Therefore, as shown in FIG. 7, in this embodiment, a reinforcing member 28 that restricts the forward tilt angle, that is, the amount of movement of the stop pad 30, is provided below the bent portion of the pad support pipe 40. Yes. Thereby, even if a large forward load is applied to the stop pad 30, the forward tilt of the pad support pipe 40 is limited, and the position of the stop pad 30 can be maintained at a predetermined height or more.

  FIG. 8 is a partially broken side view of a fourth embodiment of the load absorbing portion, and the same reference numerals as those described above represent the same or equivalent portions.

A connecting bar support member 45 is firmly fixed to the head pipe 11 with bolts 51, 51 via a stay 42. A pipe-like connection bar 46 penetrates the connection bar support member 45 in the left-right direction, and both are firmly connected by appropriate means such as welding. The lower end portion of the pad support pipe 40 is vertically penetrated and fixed to the center portion of the connection bar 46, and the pad support pipe 40 extends rearward and obliquely upward with the center portion of the connection bar 46 as a fulcrum.

  The occupant restraining pad 30 is positioned and fixed to the upper end of the pad support pipe 40 by a bolt 52 so as to face the occupant's chest through a plate member 31. As shown in FIG. 9, after the plastic deformation in which the torsional stress exceeds the elastic limit and the connection bar 46 is crushed starts to be restricted inside the connection bar 46, the collapse is limited to the connection bar 46. A crushing prevention member 47 for maintaining a predetermined elastic force is filled or inserted.

  In such a configuration, when a forward load is applied to the stop pad 30 and the connecting bar 46 is twisted, the pad support pipe 40 starts moving forward. Further, when a forward load is applied and the torsional stress applied to the connecting bar 46 exceeds the elastic limit of the connecting bar 46, plastic deformation (collapse deformation) starts, and the pad support pipe 40 rotates forward with the connecting bar 46 as a fulcrum. At this time, in this embodiment, since the collapsing prevention member is inserted inside the connecting bar 46, the collapsing of the connecting bar 46 is limited. As a result, the connecting bar 46 maintains elasticity even in the plastic region exceeding the elastic limit. it can. Therefore, even when a load exceeding the stress limit of the pad support pipe 40 is applied to the restraining pad 30, the occupant can be reliably restrained, and a part of the load can be continuously absorbed to reduce the load applied to the occupant's chest. it can.

  In each of the above-described embodiments, the pad support pipe 40 is described as being composed of a single piece. However, the present invention is not limited to this, and as shown in FIG. The support pipe 40 may be composed of a pair of left and right pad support pipes 40L and 40R, and the plate member 31 may be supported by these.

1 is a side view of a scooter type motorcycle to which an occupant restraint device of the present invention is applied. It is the front view which showed an example of the handle | steering wheel with which a stop pad is mounted | worn. It is the figure which showed a mode that a passenger | crew's movement was blocked | prevented by the stop pad. It is sectional drawing of 1st Embodiment of a load absorption part. It is sectional drawing of 2nd Embodiment of a load absorption part. It is sectional drawing of 3rd Embodiment of a load absorption part. It is sectional drawing which showed an example of the reinforcement member which restrict | limits the inclination-angle of a handle pipe. It is sectional drawing of 4th Embodiment of a load absorption part. FIG. 9 is a cross-sectional view of a waist portion of the fourth embodiment shown in FIG. 8. It is the figure which showed the relationship between the movement amount of a stop pad, and the load added to a passenger | crew. It is the front view which showed another example of the handle | steering wheel with which a stop pad is mounted | worn.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Head pipe, 15 ... Front fork, 16 ... Steering handle, 20 ... Handle pipe, 30 ... Stop pad, 31L, 31R ... Plate member, 32 ... Elastic member, 33 ... Coil spring, 34 ... Bellows-like collapsible body

Claims (7)

In an occupant restraint device that restricts the movement of a motorcycle occupant forward,
A head pipe that supports the steering wheel freely,
An occupant restraining pad is mounted on one end side, and a pipe-shaped pad support member that is a separate member from the head pipe,
A connecting member for connecting and fixing the other end side of the pad support member to the head pipe such that the occupant stop pad faces the occupant;
Look including a load absorbing member for limiting the plastic deformation of the pad supporting member absorbs the forward load applied to the occupant restraint pad,
The occupant restraint device for a two-wheeled vehicle , wherein the pad support member is fixed to the connecting member so as to be directed in front of the head pipe and obliquely rearward and rearward along the head pipe .   The occupant restraint device for a two-wheeled vehicle according to claim 1, wherein the load absorbing member is a crush prevention member that limits crush deformation of the pad support member.   The occupant restraint device for a motorcycle according to claim 1 or 2, wherein the load absorbing member is an elastic member inserted through a plastic deformation portion of the pad support member.   The occupant restraint device for a two-wheeled vehicle according to claim 1 or 2, wherein the load absorbing member is a coil spring inserted through a plastic deformation portion of the pad support member.   The occupant restraint device for a motorcycle according to claim 1, wherein the load absorbing member is a bellows-like collapsible body formed on the pad support member. In an occupant restraint device that restricts the movement of a motorcycle occupant forward,
A head pipe that supports the steering wheel freely,
An occupant restraining pad is mounted on one end side, and a pipe-shaped pad support member that is a separate member from the head pipe,
A connecting member for connecting and fixing the other end side of the pad support member to the head pipe such that the occupant stop pad faces the occupant;
A load absorbing member that absorbs a forward load applied to the occupant restraining pad and restricts plastic deformation of the pad support member;
The pad support member is fixed to the connecting member so as to be directed obliquely rearward and rearward along the head pipe in front of the head pipe,
The connecting member is
A pipe-like connecting bar that is vertically connected to the other end of the pad support member and extends in the left-right direction of the vehicle body;
A connection bar support member that supports the connection bar at both ends,
The occupant restraint device for a two-wheeled vehicle, wherein the load absorbing portion is an elastic member that is inserted through the inside of the connecting bar and restricts torsional deformation of the connecting bar.   The occupant restraint device for a two-wheeled vehicle according to any one of claims 1 to 6, further comprising a reinforcing member that limits an amount of forward tilt of the pad support member.

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