JP2009040161A - Accelerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accelerator 1, making sticking hard to be caused, even if it is caused, a pedal arm 3 surely returns to a resting position, and even if stepping force is impressed thereafter, capable of stable stepping operation. <P>SOLUTION: An operation resistance generating means 10 and a hysteresis generating means 20 are structurally separated. The operation resistance generating means 10 respectively and independently energizes first and second return springs 11 and 12 to first and second movable members 13 and 14 to constitute a two-piece combination spring structure inside and outside a linearly moving type of respectively and independently pushing back to an original position. The hysteresis generating means 20 for generating hysteresis in response to an increase-decrease in operation resistance, is composed of a rotary part 33 moving in the rotary shaft direction by rotation of the pedal arm 3 and a friction plate 36 for increasing-decreasing frictional force by pressing force of the rotary part 33. Thus, the sticking is hardly caused, and even if the sticking is caused, the pedal arm 3 surely returns to the resting position, and stepping thereafter can be stably operated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an accelerator device.

[Conventional technology]
Conventionally, the accelerator device is mechanically connected to the throttle device by a wire or the like, and the wire is pulled by depressing the accelerator pedal, and the throttle opening is adjusted well by the operation resistance force of the wire and the hysteresis characteristic thereof. It was. On the other hand, in recent years, an accelerator device (electric accelerator device) that electrically detects the operation amount of the accelerator with a rotation angle sensor and electrically controls the throttle opening according to the operation amount of the accelerator has been used.

  In such an electric accelerator device, in order to generate a hysteresis characteristic in response to the accelerator operation amount and the accelerator operation force, a moving member that moves according to the accelerator operation is pressed against the sliding member to generate a frictional force. When the accelerator operation amount increases, the pressing force of the moving member against the sliding member increases, and when the accelerator operation amount decreases, the pressing force decreases and the hysteresis generating means increases or decreases the friction force. Known (see, for example, Patent Documents 1 and 2).

  Hysteresis generating means mainly consists of the pedal arm rotating when the accelerator pedal is stepped on, and the moving member moves in the direction of the rotation axis by this rotation, and the pressing force on the sliding member is increased or decreased to hysteresis the accelerator operating force. Those that generate characteristics (for example, see Patent Document 2), and those that increase or decrease the pressing force on the sliding member by the stroke of the free end by the rotation of the pedal arm to generate hysteresis characteristics in the operating force of the accelerator ( For example, see Patent Document 1). Each hysteresis generating means has advantages and disadvantages. For example, the fail-safe function has the following problems.

  First, as conventional example 1, an accelerator device 100 disclosed in Patent Document 1 includes a pedal arm 102 that can move from a rest position to a maximum depression position by increasing or decreasing the depression force of an accelerator pedal 101, as shown in FIG. A pedal shaft 103 that swingably supports the arm 102, a return spring 104 that urges the pedal arm 102 to return toward the rest position, and a frictional force that increases and decreases as the pedal arm 102 moves to reduce hysteresis. Hysteresis generating means 110 is provided.

  The hysteresis generating means 110 is disposed in the sliding guide path 111 that defines a sliding surface that generates a frictional force, and in the sliding guide path 111, and in the sliding guide path 111 by the load of the pedal arm 102. The first movable friction member 113 having a first inclined surface 112 that forms a predetermined angle with respect to the moving direction, and the first movable friction member 113 facing the first moving friction member 113 in the moving direction and sliding guide The second movable friction member 115 having a second inclined surface 114 that moves in the path 111 and abuts against the first inclined surface 112, and the first and second movable friction members 113 and 115 compete with the load of the pedal arm 102. And return springs 116 and 117 for generating an operation resistance force by urging the direction of the operation and returning the original position.

  In the first conventional example, the frictional force is generated by the first reciprocatingly attached in the sliding guide path 111 with the movement of the contact member 121 attached to the free end of the pedal arm 102. It occurs on the sliding surfaces 123 and 125 of the movable friction member 113 and the second movable friction member 115. At the time of application of depression (increase in depression force), an increase in the operation resistance force due to an increase in the urging force accompanying the compression of the return springs 116 and 117 that urge the second movable friction member 115 to return to the original position, and this operation As the resistance force increases, the wedge action between the first inclined surface 112 and the second inclined surface 114 is promoted, so that the pressing force against the sliding surfaces 123 and 125 increases, and the frictional force increases. Since the frictional force acts in the same direction as the operation resistance force, the pedaling force greatly increases as a combined resistance force of the friction force and the operation resistance force.

  On the other hand, when the stepping is canceled (stepping force is reduced), the frictional force is opposite to the operation resistance force of the return springs 116 and 117 as the contact member 121 is returned, contrary to the above operation. Since it acts in the direction, the pedaling force becomes the difference between the frictional force and the operation resistance force, and the combined resistance force decreases. Thereby, the change characteristic of the pedaling force with respect to the depression amount exhibits a so-called hysteresis characteristic (see FIG. 4), and a good operation feeling of the accelerator operation can be ensured.

  In other words, the hysteresis generating means 110 of the prior art example 1 realizes the operation resistance force and the generation of hysteresis characteristics, and realizes the springs 116 and 117 and the first and second movable friction members 113 and 115 in a structurally integrated configuration. . Therefore, the increase / decrease in the urging force by the return springs 116, 117 is converted into a pressing force by the wedge action, and the increase / decrease in the pressing force increases / decreases the frictional force on the sliding surface of the sliding guide path 111, thereby generating hysteresis. Thus, a stick on the sliding surface of the sliding guide path 111 is likely to occur.

  If the second movable friction member 115 or the first movable friction member 113 does not stick back in the housing 118, the contact member 121 attached to the free end of the pedal arm 102 is Since the first movable friction member 113 is configured to be able to be engaged and disengaged, the pedal arm 102 is always urged by the urging force of the return spring 104 attached to the pedal shaft 103 separately from the return springs 116 and 117. It is characterized by being returned to a rest position.

  Here, the return springs 116 and 117 have two compression coil springs that are doubled inside and outside, thereby increasing the degree of freedom when setting the urging force and reducing the size of the return springs 116 and 117. We are trying to improve the fail-safe. The idle load spring 122 is also constituted by a compression coil spring, and is accommodated in the second movable friction member 115, and generates an urging force in a direction away from the first movable friction member 113 and the second movable friction member 115. There is a pedaling play.

  Subsequently, as a conventional example 2, the accelerator device 200 disclosed in Patent Document 2 rotates the accelerator pedal 201 in the normal rotation direction X by increasing the pedal force when the accelerator pedal 201 is depressed as shown in FIG. . When the depression is released, the accelerator pedal 201 is rotated in the reverse direction Y by the urging force of the return springs 216 and 217 that engage with the engaging portion 237 due to the decrease in the depression force. Further, when the accelerator pedal 201 is applied and released, the operation resistance is increased / decreased with respect to the accelerator pedal 201 to generate a predetermined hysteresis characteristic to obtain a favorable operation feeling of the accelerator pedal 201. The generating means 210 is configured.

  That is, the hysteresis generating means 210 of the accelerator device 200 is structurally formed separately from the operation resistance generating means 230 by the return springs 216 and 217. The hysteresis generating means 210 is disposed on the rotating shaft 220 of the pedal arm 202, and includes a moving member 233 and a sliding member 236 that move in the rotating shaft direction when the pedal arm 202 rotates. Therefore, the stick is unlikely to occur when the urging force is increased or decreased by the return springs 216 and 217.

  The return springs 216 and 217 have at least two compression coil springs inserted into the inner and outer layers, thereby increasing the degree of freedom in setting the urging force and reducing the size of the springs. We are trying to improve failsafe such as breakage.

  Accordingly, the return springs 216 and 217 have one end engaged with the engaging portion 237 at the free end of the pedal arm 202 and the other end engaged with the top plate 219 of the housing 218, so that the rotation of the pedal arm 202 is achieved. Accordingly, it is characterized in that the accelerator pedal 201 and the pedal arm 202 are rotated in the reverse rotation direction Y and always returned to the rest position without sticking because they are expanded and contracted in an arc shape and have a separate structure.

[Problems with conventional technology]
By the way, in the accelerator apparatus 100 of the prior art example 1, when the second movable friction member 115 or the first movable friction member 113 does not stick back in the housing 118 for some reason, the pedal arm 102 moves to the return spring 104. It is always returned to the rest position by the urging force. Therefore, as shown in FIG. 3B, in the rotation angle detecting means 130 that detects the swing displacement of the pedal arm 102 as the rotation angle via the sensor drive pin 131, if the pedal arm 102 returns to the rest position, the accelerator The depression amount of the pedal 101 is detected to be zero, and the throttle opening is fully closed so that it can be set to the safe side.

  However, if the accelerator pedal 101 is depressed without the first or second movable friction member 113, 115 returning, the operation resistance force and the predetermined hysteresis characteristics cannot be secured, and the accelerator operation becomes too light and unstable. There is a concern that a favorable operation feeling of the accelerator operation cannot be obtained. That is, although the necessary condition that the accelerator pedal always returns to the rest position as the fail-safe function is satisfied, it does not satisfy the necessary and sufficient condition of ensuring a stable depressing operation even if the depressing is applied thereafter.

  Further, in the accelerator device 200 of the conventional example 2, since the return springs 216 and 217 expand and contract in an arc shape, a bending moment is added to the spring member, and the bending stress increases in addition to the torsional stress. Even if the allowable stress of the member is exceeded or not exceeded, the repeated fatigue stress limit may be significantly reduced. For this reason, it is not impossible to design in consideration of bending stress in advance and ensure a sufficient safety factor for the repeated fatigue stress limit, but it is not easy and the return springs 216 and 217 are enlarged. This raises concerns about cost increases.

Further, since the return springs 216 and 217 expand and contract in an arc shape, a side hose that always faces the outer side of the arc shape is generated in the spring seating portion, and a locking portion 237 on which the return springs 216 and 217 are seated by the side hose. There is a concern that it will be off.
WO 01/019638 pamphlet JP 2004-108214 A

  Therefore, in the accelerator device, the operation resistance force generating means for generating the operation resistance force of the treading force and the hysteresis generation means for generating the hysteresis with the increase or decrease of the operation resistance force are structurally separated, and the increase or decrease of the friction force is the hysteresis generation means. This is realized by only the sliding member, and the increase / decrease of the operation resistance force and the return of the accelerator pedal to the original position are realized by the urging force of the operation resistance force generation means so that the operation resistance force generation means does not generate friction force. The stick does not occur or is less likely to occur.

  The operation resistance generating means includes two movable members that can move independently, and each return spring that is expanded and contracted by the movement of each movable member is provided independently. The spring structure has a two-piece structure, and each movable member is urged independently to return to its original position. Even if any of the movable members does not return for some reason, the return is attached. The pedal arm always returns to the rest position due to the return of the return spring that urges any of the movable members and the movable members under the influence of each force, and then returns to the original position even if the pedal is applied. The fail-safe function is improved so as to obtain a moderately stable operation feeling by the operation resistance force and hysteresis by the spring.

  In addition, a direct-acting return spring is used to prevent the side hose from acting on the seat of the return spring, making it easy to design and manufacture, improving size and durability, and realizing an inexpensive accelerator device. Is a problem.

  Therefore, the present invention has been made to solve the above-described problem. Even when a stick is hardly generated, the pedal arm always returns to the rest position, and even if a pedaling force is applied thereafter, a stable depressing operation is performed. It is an object of the present invention to provide an accelerator device that can perform the following.

[Means of Claim 1]
According to the first aspect of the present invention, the pedal arm that can move in the forward direction and the reverse direction by increasing / decreasing the depression force of the accelerator pedal, the shaft portion that supports the pedal arm so as to be swingable, and the movement of the pedal arm An accelerator device comprising: an operating resistance force generating means for generating an operating resistance force; and a hysteresis generating means for generating a hysteresis when the operating resistance force is increased or decreased, wherein the hysteresis generating means is a shaft portion of the pedal arm. When the pedal arm moves in the forward direction and the reverse direction, a moving member that moves in the axial direction of the shaft portion to generate a pressing force and a sliding member that contacts the moving member corresponds to the pressing force. And a sliding member that increases or decreases the frictional force,
The operating resistance generating means is disposed in contact with the lever portion on the other end side of the pedal arm, and is guided in the movable guide path that demarcates a movable surface, and is independently movable reciprocally. A first return spring and a second return spring that urge the first movable member, the second movable member, the first movable member, and the second movable member in a direction that antagonizes the load of the pedal arm and pushes them back to their original positions. Are formed separately from the hysteresis generating means, and a pressing force is not always generated in each movable member of the operation resistance generating means.

  Thereby, the rotation of the pedal arm due to the application of the pedaling force is converted into an axial movement amount of the shaft portion, and the hysteresis generating means increases or decreases the friction force by the moving member and the sliding member that increases or decreases the pressing force, and the operation. The resistance force generating means expands and contracts the first return spring and the second return spring to generate an operation resistance force that antagonizes the load of the pedal arm by expanding and contracting, and the first movable member and the second movable member are respectively independent of each other. Since the operating resistance force generating means and the hysteresis generating means are separated from each other so that the urging force is pushed back to the original position, the hysteresis friction force increase / decrease occurs only at the sliding member of the hysteresis generating means. However, it does not occur in the operation resistance generating means. In the operation resistance generating means, the operation resistance is simply increased or decreased due to the expansion and contraction of the return spring, and no sticking force is generated.

[Means of claim 2]
According to a second aspect of the present invention, the operation resistance generating means is accommodated in the first movable member that is reciprocally movable in the movable guide path, and the axial center portion of the first movable member, and the first movable member. A second movable member that is reciprocally movable in the interior, a first return spring that urges the first movable member in a direction that antagonizes the load of the pedal arm, and an inner side of the first return spring, A second return spring that urges the movable member in a direction that antagonizes the load of the pedal arm, and the first movable member relative to the first return spring is movable in the movable guide path, and the second return spring. The second movable member with respect to the spring moves in the first movable member, and the first movable member and the second movable member are each independently returned to the original position.

  Thus, even if the first movable member does not return to the original position for some reason, the first and second movable members are independently urged by the return springs, so the second movable member is It is pushed back to its original position by the second return spring. Further, even when the second movable member does not return to the original position, the first movable member is biased by the first return spring, so the second movable member housed in the axial center portion of the first movable member is The pedal arm is pushed back to the original position together with the first movable member, and the pedal arm can always return to the rest position.

  And even if further depression is applied after returning to the rest position, at least any urging force of each return spring is generated against the depression force of the depression, so that the accelerator operation does not become unstable, A moderately stable operation feeling can be obtained.

[Means of claim 3]
According to a third aspect of the present invention, the operating resistance force generating means includes a first return spring and a second return spring which are arranged inside and outside of each other, and each of them is independent and linearly moves to urge it. It is a type spring.

  As a result, two return springs are independently combined inside and outside, so that the degree of freedom in designing each return spring that matches the magnitude of the biasing force of each return spring and the required composite biasing force increases. At the same time, the size of each return spring can be improved. Moreover, since the spring specification is a direct acting type, the generation of the side hose is eliminated when the return springs are expanded and contracted, and it is possible to prevent the seat springs from slipping out or falling off during expansion and contraction. That is, it is easy to design and manufacture the return spring, and it is possible to reduce the size and improve the durability in terms of strength and to reduce the cost.

  The best mode of the present invention will be described together with Example 1 shown in the drawings.

[Configuration of Example 1]
An accelerator device according to the present invention of this embodiment is shown in FIGS. Fig.1 (a) is a partially cutaway front view which shows the principal part of an accelerator apparatus, (b) is AA sectional drawing of (a). FIG. 2A is an operation explanatory diagram of the operation resistance generating means at the maximum depression position of the accelerator pedal, and FIG. 2B is an operation explanatory diagram of the operation resistance generating means when a stick or the like is generated.

  The accelerator device 1 is mounted on a vehicle and controls the driving state (throttle opening) of the vehicle in response to a depression operation of the accelerator pedal 2 by the driver. The accelerator device 1 of the present embodiment is applied to an electric accelerator device that electrically detects the operation amount of the accelerator pedal 2 with a rotation angle sensor 6 and electrically controls the throttle opening in accordance with the operation amount of the accelerator pedal 2. To do. Hereinafter, the configuration of the accelerator apparatus 1 of the present embodiment will be described with reference to FIGS.

  In the accelerator apparatus 1, the accelerator pedal 2 is supported by a housing 5 as a support member, and the shaft portion 4 is pivotally supported, and the accelerator pedal 2 can rotate in the forward rotation direction X and the reverse rotation direction Y about the axis O of the shaft portion 4. The housing 5 is made of a resin material, is formed in a box shape having an opening 51, and includes a bottom plate 52, a top plate 53, side plates 54 and 55, and a connecting plate 56. The opening 51 of the housing 5 is formed between the other end of the bottom plate 52 and the other end of the top plate 53 and between the other ends of the side plates 54 and 55. The side plates 54 and 55 are vertically connected to the bottom plate 52 and the top plate 53 and face each other. The top plate 53 is formed to face the bottom plate 52, and the pedal stopper 7 is integrally provided. The bottom plate 52 is fixed to the vehicle with bolts or the like.

  A cylindrical spring accommodating portion 57 is provided adjacent to the connecting plate 56, and the inner wall is defined in a cylindrical shape by a movable guide path 15 that extends uniformly in the longitudinal direction of the spring accommodating portion 57. Opening forms an opening 60, the other is closed by an end plate 58. The cylindrical spring accommodating portion 57 is preferably cylindrical and may be rectangular. Stepped projections 59 and 61 are provided on the inner wall of the end plate 58 to constitute a seating portion that engages with the first return spring 11 and the second return spring 12 that are described later. Further, a slit-shaped notch for allowing the lever portion 37 of the pedal arm 3 to be described later to protrude is formed at a predetermined length on the opening 60 side of the connecting plate 56.

  As shown in FIG. 1B, one side plate 54 can be attached to and detached from other parts of the housing 5. The bearing portion 17 projects in a cylindrical shape from the inner wall surface of the side plate 54. The side plate 54 supports the rotation angle sensor 6 disposed on the inner peripheral side of the bearing portion 17 by a portion that closes the proximal end portion side of the bearing portion 17. A connector 19 that is electrically connected to the rotation angle sensor 6 is provided on the outer wall of the side plate 54.

  The shaft portion 50 projects in a cylindrical shape from the inner wall surface of the other side plate 55. The shaft portion 50 of the side plate 55 protrudes in the direction of the axis O with its axis aligned, and is engaged with the pedal arm 3 so as to be rotatable, like the bearing portion 17 of the opposing side plate 54.

  As shown in FIGS. 1A and 1B, the accelerator pedal 2 includes a pedal arm 3 having a shaft portion 4 and a rotor 22. The pedal arm 3 is formed of a resin material or a metal material, and is bent and extended in an obtuse V-shape or U-shape. One end of the pedal arm 3 projects from the shaft portion 4 to the outside through the opening 51 of the housing 5, and a pedal portion (not shown) is provided at the final end of the projecting portion.

  Further, the other end side of the shaft portion 4 of the pedal arm 3 is accommodated in the housing 5, and two side wall portions 24 and 25 are provided in the accommodating portion. The side wall portions 24 and 25 are provided in the vicinity of the axis O of the shaft portion 4 of the pedal arm 3 and face each other in parallel in the direction of the axis O. Accordingly, the shaft portion 4 is disposed on the side wall portion 25 facing the side plate 54, and the shaft portion 50 is disposed on the side plate 55 facing the side wall portion 24.

  The shaft portion 4 projects from the wall surface of the side wall portion 25 on the side plate 54 side in a substantially cylindrical shape in the direction of the axis O. The shaft portion 4 is inserted on the inner peripheral side of the bearing portion 17 of the side plate 54 and is rotatably supported by the bearing portion 17. Further, the side wall portion 24 is provided with a rotation hole 29 that is pivotally engaged with the shaft portion 50 with the axis center aligned with the axis O direction.

  The pedal arm 3 can rotate in the forward rotation direction X and the reverse rotation direction Y around the axis O by the engagement of the rotation hole 29 and the shaft portion 50 and the bearing of the shaft portion 4 by the bearing portion 17. Note that when the driver steps on the stepping portion, the pedal arm 3 rotates in the forward direction X, and when the driver releases the stepping, the pedal arm 3 rotates in the reverse direction Y. Further, in this embodiment, since the driver does not necessarily depress the stepped portion in an accurate vertical direction, the space between the outer peripheral surface of the shaft portion 4 and the inner peripheral surface of the bearing portion 17, and the rotation hole 29 A clearance for generating a radial axial play is provided between the shaft 50 and radial displacement and inclination of the pedal arm 3 with respect to the axis O direction are allowed within the clearance.

  Magnet portions 26 and 27 having different polarities are embedded in two portions of the shaft portion 4 in the circumferential direction across the axis O so as to be integrally rotatable. The rotation angle sensor 6 supported by the side plate 54 includes a Hall element, a magnetoresistive element, or the like, and detects a magnetic field formed by the magnet portions 26 and 27 disposed with a gap on the outer periphery thereof. The detection signal output from the rotation angle sensor 6 represents the rotation angle of the shaft portion 4.

  The hysteresis generating means 20 comprises a rotor 22 as a moving member and a friction plate 36 as a sliding member. The rotor 22 is formed of a resin material, and has a lever portion 37 protruding in a plate shape or a rod shape and a disc-shaped rotation portion 33 and is accommodated in the housing 5. The disc-shaped rotating portion 33 is sandwiched between both side walls 24 and 25 of the pedal arm 3 on both side surfaces. A plurality of helical teeth 35 are provided on the side surface of the rotating portion 33 on the side wall portion 25 side. The plurality of helical teeth 35 are arranged at equal intervals around the axis O. In the side wall portion 25 of the pedal arm 3, a plurality of helical teeth 34 are provided on the wall surface on the rotating portion 33 side. The plurality of helical teeth 34 are arranged at equal intervals around the axis O, and mesh with any of the helical teeth 35 facing in the direction of the axis O. By this meshing, the pedal arm 3 and the rotor 22 can be rotated together around the axis O.

  A friction plate 36 is interposed between the side surface of the rotating portion 33 on the side wall portion 24 side and the wall surface of the side wall portion 24 on the rotating portion 33 side. The friction plate 36 is made of a synthetic resin material having good sliding characteristics, and is engaged with the shaft portion 50 and is also engaged with the fixing portion 41 of the housing 5 so as to be displaced together with the rotating rotation portion 33. Rather, the frictional force is generated in sliding contact with both the rotating portion 33 and the side wall portion 24. The frictional force increases the force by which the side wall portion 25 and the rotating portion 33 of the pedal arm 3 are separated to both sides in the axis O direction due to the meshing action of the helical teeth 34 and 35, and the pressing force of the rotating portion 33 increases. As a result, the frictional force increases.

  The lever portion 37 of the rotor 22 protrudes from the outer peripheral edge portion of the rotating portion 33 in a tangential direction in a plate shape or a rod shape. The lever portion 37 is formed on the other end side of the side wall portions 24 and 25 of the pedal arm 3 and extends to the axial center position of the cylindrical spring accommodating portion 57. The upper and lower surfaces in the thickness direction protruding in the shape of a plate or rod are opposed to the end plate 58 and the opening 60, respectively. The surface of the lever portion 37 on the end plate 58 side has a hemispherical surface, and is formed so that the acting force always acts in the axial direction by hitting a point.

  Next, the first and second return springs 11 and 12 as urging members of the operating resistance generating means 10 according to the present invention are both constituted by compression coil springs. The second return spring 12 has a coil diameter smaller than that of the first return spring 11 and is arranged on the inner peripheral side of the first return spring 11 to form a combination structure of two inside and outside.

  Each return spring 11, 12 is disposed in a spring accommodating portion 57 that defines a smooth movable guide path 15, and the first movable member 13 that is moved in the spring accommodating portion 57 by the load of the pedal arm 3, One end of the first movable member 13 is engaged with the second movable member 14 that is disposed in the inner cylindrical portion 16 of the movable member 13 and is supported by the load of the pedal arm 3 so as to be relatively movable in the inner cylindrical portion 16. The portion is fitted into and engaged with stepped convex portions 59 and 61 formed on the end plate 58 of the spring accommodating portion 57.

  The biasing force of the first return spring 11 directly biases the first movable member 13, and the biasing force of the second return spring 12 directly biases the second movable member 14. A direct acting type acting as a combined urging force of the second movable member 14 supported so as to be relatively movable in the first movable member 13 and acting against the load of the lever portion 37 of the pedal arm 3 or pushing back. A return spring structure is formed.

  The first movable member 13 and the second movable member 14 are movable members that move in the cylindrical spring accommodating portion 57 and the inner cylindrical portion 16 of the first movable member 13, respectively. The length of the direction (movable direction) is increased, the inclination of the movable direction is reduced as much as possible, and a stick or the like is hardly generated. The inner wall surface of the movable guide path 15 and the second movable member 14 The clearance with the outer wall surface is sufficiently maintained.

  Thus, the return springs 11 and 12 cause the first movable member 13 and the second movable member 14 to act on the urging force independently, and the pedal arm 3 connected to the lever portion 37 is connected to the return springs 11 and 12. Can be rotated back in the reverse rotation direction Y.

  As a result, the hysteresis generating means 20 and the operating resistance generating means 10 are structurally separated from each other, and the operating resistance generating means 10 has the respective biasing forces of the two direct-acting return springs 11, 12. The accelerator device 1 can be configured such that the pedal arm 3 always returns to the rest position by urging the inner and outer movable members 13 and 14 independently.

  As described above, in this embodiment, the operating resistance generating means 10 and the hysteresis generating means 20 are structurally separated, and the operating resistance generating means 10 includes the first return spring 11 and the second return spring 12. A direct-acting return spring structure is employed in which the urging force is independently urged to the first movable member 13 and the second movable member 14 and is independently pushed back to the original position.

  Further, the hysteresis generating means 20 for increasing and decreasing the frictional force corresponding to the generated operation resistance force to generate hysteresis is provided, and the rotor 22 and the friction plate 36 are sandwiched between the rotating shaft portions of the pedal arm 3 and the rotation of the rotor 22 is performed. A structure in which the side wall portion 25 of the pedal arm 3 and the rotating portion 33 are separated from each other in the direction of the axis O by the meshing action of the helical teeth 34 and 35 provided on the moving portion 33 to increase or decrease the pressing force of the rotating portion 33. Adopted.

  When the driver depresses the accelerator pedal 2 and the pedal force is applied, the accelerator pedal 2 rotates in the forward direction X to increase the friction force by the friction plate 36 as the pedal force increases, thereby eliminating the pedal force. In some cases, the accelerator pedal 2 rotates in the reverse direction Y to reduce the pedaling force and reduce the frictional force generated by the friction plate 36 to generate hysteresis.

[Operation of Example 1]
The operation of the accelerator device 1 having the above configuration will be described with reference to FIGS.
As shown in FIG. 2A, when the driver applies a pedaling force to the step portion of the accelerator pedal 2, the pedal arm 3 rotates around the rotation axis in the normal rotation direction X from the rest position. When the pedal arm 3 rotates, the lever portion 37 on the other end side of the pedal arm 3 rotates in the same manner, and the hemispherical action point of the free end portion of the lever portion 37 produces a stroke in an arc shape.

  The second return spring 12 and the first return spring 11 respectively engaged with the second movable member 14 and the first movable member 13 that are in contact with the hemispherical action point of the lever portion 37 with respect to this stroke are both The urging forces generated by pressing and compressing are combined to antagonize the pedaling force as the operation resistance force. Accordingly, the operation resistance increases in response to an increase in the stroke, whereby the pedaling force also increases in response to the depression and a tread response occurs.

  Further, when the pedal arm 3 rotates, the pedal arm 3 in which the helical teeth 34 and 35 mesh with each other and the rotor 22 rotate while being in sliding contact with the friction plate 36. At this time, the rotation angle sensor 6 detects the rotation angle of the shaft portion 4 of the pedal arm 3 based on the magnetic field formed by the magnet portions 26 and 27.

  When the pedaling force is increased, the pedal arm 3 and the rotor 22 rotate in the normal rotation direction X. Along with the rotation in the forward rotation direction X, the pedal arm 3 and the rotor 22 are engaged with the side walls 25 of the pedal arm 3 and the rotating portion 33 of the rotor 22 by the meshing action of the helical teeth 34, 35. The force for separating the two sides in the direction increases, and the pressing force of the friction plate 36 increases accordingly, and the friction force of the friction plate 36 increases. At this time, the combined urging force of the first and second return springs 11 and 12 and the friction force between the friction plates 36 act in the reverse direction Y, and the sum of these acts as the stepping force. Accordingly, a further tread response occurs, and it is possible to stably keep the accelerator opening constant by stopping the depression and maintaining an appropriate depression force.

  On the other hand, when the pedaling force is decreased, the pedal arm 3 and the rotor 22 rotate in the reverse rotation direction Y by the combined urging force of the first and second return springs 11 and 12. Along with the rotation in the reverse rotation direction Y, the friction force between the pedal arm 3 and the rotor 22 with the friction plate 36 is the normal rotation direction opposite to the combined urging force of the first and second return springs 11 and 12. Work on X. At this time, the first and second return springs 11 and 12 that are extended by the return of the pedal arm 3 reduce the combined urging force. At this time, the force of separating the side wall portion 25 of the pedal arm 3 and the rotating portion 33 of the rotor 22 to both sides in the direction of the axis O due to the meshing action of the helical teeth 34 and 35 decreases as the pedal arm 3 returns. At the same time, the friction force decreases. As a result, hysteresis occurs in the pedaling force characteristic with respect to the pedal depression amount when the pedaling force is applied and when the pedaling force is released.

  Further, if any one of the first movable member 13 and the second movable member 14 does not return for some reason, the return springs 11 and 12 are independent of each other from the first movable member 13 and the second movable member 14. Therefore, for example, the second movable member 14 is pushed back (see FIG. 2 (b)) by the biasing force of one of the return springs, so that the lever portion 37 is also pushed back, and the pedal is pushed. The arm 3 can be rotated back in the reverse direction Y. At this time, the pedal arm 3 always returns to the rest position.

  In addition, even if depression is applied to the accelerator pedal 2 in this state, an urging force is generated in response to the depression force in any of the return springs 11 and 12 that have returned independently. Therefore, it is possible to expect an energizing force that is at least half of the energizing force before it can no longer return (the setting of this energizing force can be increased by the internal / external combination structure, and almost any setting is possible). As a result, a frictional force is generated in the hysteresis generating means 20 and hysteresis is also generated, and an accelerator pedal operation with a moderately stable response can be performed.

[Effect of Example 1]
The accelerator device 1 of the present embodiment is provided with the operating resistance generating means 10 and the hysteresis generating means 20 separated structurally, and the operating resistance generating means 10 is provided with a first return spring 11 and a second return spring 12. Two combined spring structures are formed on the inside and outside of the direct acting type in which the urging forces are independently urged to the first movable member 13 and the second movable member 14 and are independently pushed back to their original positions.

  Further, the hysteresis generating means 20 for generating hysteresis by increasing or decreasing the frictional force corresponding to the generated operation resistance force is sandwiched between the rotor 22 and the friction plate 36 in the axial direction of the shaft portion 4 of the pedal arm 3, and the rotor The side wall 25 of the pedal arm 3 and the rotation part 33 are separated from each other in the direction of the axis O by the meshing action of the helical teeth 34, 35 provided on the rotation part 33 of the 22, and the pressing force of the rotation part 33 is increased or decreased. It is configured to do.

  As a result, the increase or decrease of the friction force on the friction plate 36 of the hysteresis generating means 20 that becomes hysteresis occurs only in the friction plate 36 of the hysteresis generation means 20 and does not occur in the operation resistance force generating means 10. In the operation resistance generation means 10, the operation resistance force is simply increased / decreased due to the expansion and contraction of the return springs 11, 12, and the pressing force is not generated, so that the stick is hardly generated.

  Even if the first movable member 13 does not return to its original position for some reason, the first and second movable members 13 and 14 are independently urged by the return springs 11 and 12, respectively. The second movable member 14 is pushed back to the original position by the second return spring 12. Even when the second movable member 14 does not return to the original position, the first movable member 13 is urged by the first return spring 11, so that it is accommodated in the inner cylinder portion 16 of the first movable member 13. The second movable member 14 is pushed back together with the first movable member 13 to the original position, and the pedal arm 3 is always returned to the rest position.

  Even if further depression is applied after returning to the rest position, at least one of the urging forces of the return springs 11 and 12 is generated in an antagonistic manner with respect to the depression force of the depression, so that the accelerator operation becomes unstable. Therefore, a moderately stable operation feeling can be obtained.

  In addition, the combination structure of two inside and outside increases the degree of freedom in designing springs that match the magnitude of the urging force of each return spring 11, 12 and the required urging force, and can improve the size of the spring. It becomes.

  Further, the direct-acting spring structure eliminates the occurrence of side hoses when the springs are expanded and contracted, and can prevent the seat portion from being displaced or dropped during expansion and contraction. That is, the return springs 11 and 12 can be easily designed and manufactured, the size can be reduced, the durability can be improved, and the cost can be reduced.

[Modification]
In the first embodiment, the accelerator pedal 2 is composed of the pedal arm 3 and the rotor 22; however, the accelerator pedal 2 may be composed of one member or three or more members. May also be rectangular or circular.
Moreover, although the 1st return spring 11 and the 2nd return spring 12 which were comprised by the compression coil spring were used as an urging member which urges the accelerator pedal 2 to the reverse rotation direction Y, it is not restricted to this, A torsion spring is used. Regardless of which type is selected, the first return spring 11 and the second return spring 12 are independently arranged in parallel in addition to the combination of two inside and outside as in the first embodiment. Two pieces may be combined in parallel.

(A) is a partially notched front view which shows the principal part of an accelerator apparatus, (b) is AA sectional drawing of (a) (Example 1). (A) is operation | movement explanatory drawing of the operation resistance force generation means in the maximum depression position of an accelerator pedal, (b) is operation | movement explanatory drawing of the operation resistance force generation means when a stick etc. arise (Example 1). ). (A) is a partially cutaway front view showing the main part of the accelerator device, and (b) is an enlarged cross-sectional view of the Q part of (a) (conventional example 1). FIG. 6 is a hysteresis characteristic diagram of pedaling force with respect to pedal depression amount (conventional example 1). (A) is a partially notched top view which shows the principal part of an accelerator apparatus, (b) is PP sectional drawing of (a) (conventional example 2).

Explanation of symbols

1 Accelerator device 2 Accelerator pedal 3 Pedal arm 4, 50 Shaft
DESCRIPTION OF SYMBOLS 10 Operation resistance generating means 11 1st return spring 12 2nd return spring 13 1st movable member 14 2nd movable member 15 Movable guide path 16 Inner cylinder part (shaft center part)
20 Hysteresis generating means 33 Rotating part (moving member)
36 Friction plate (sliding member)
37 Lever part X Forward direction Y Reverse direction

Claims (3)

A pedal arm that can be moved in the forward and reverse directions by increasing / decreasing the pedaling force of the accelerator pedal, a shaft portion that swingably supports the pedal arm, and an operation that generates an operation resistance force as the pedal arm moves. In an accelerator device comprising resistance force generation means and hysteresis generation means for generating hysteresis in accordance with increase or decrease of the operation resistance force,
The hysteresis generating means is disposed on the shaft portion of the pedal arm,
A moving member that generates a pressing force by moving in the axial direction of the shaft portion when the pedal arm moves in the forward rotation direction and the reverse rotation direction;
A sliding member that slidably contacts the moving member and increases or decreases a frictional force in response to the pressing force;
The operation resistance generating means is disposed in contact with a lever portion on the other end side of the pedal arm, and a movable guide path defining a movable surface;
A first movable member and a second movable member which are guided in the movable guide path and independently move reciprocally;
A first return spring and a second return spring that independently bias the first movable member and the second movable member in a direction that antagonizes the load of the pedal arm and push them back to their original positions, respectively, Has a separate structure from the hysteresis generation means,
The accelerator apparatus according to claim 1, wherein the pressing force is not always generated in the first and second movable members of the operation resistance generating means. The accelerator apparatus according to claim 1,
The operating resistance generating means includes a first movable member that is reciprocally movable in the movable guide path;
A second movable member housed in the axial center of the first movable member and reciprocally movable within the first movable member;
A first return spring that urges the first movable member in a direction that antagonizes the load of the pedal arm;
A second return spring disposed inside the first return spring and biasing the second movable member in a direction that antagonizes the load of the pedal arm;
Each independently
The first movable member with respect to the first return spring is movable in the movable guide path;
The second movable member relative to the second return spring is movable within the first movable member;
The accelerator apparatus according to claim 1, wherein the first movable member and the second movable member independently return to their original positions. The accelerator apparatus according to claim 2,
The operation resistance generating means is a direct acting spring in which the first return spring and the second return spring are disposed inside and outside of each other, and independently and directly urged. Accelerator device.

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