JP2007276707A - Accelerator pedal unit for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accelerator pedal unit for an automobile provided with a hysteresis mechanism capable of suppressing production cost by improving an assembling property. <P>SOLUTION: This accelerator pedal unit 1 includes an arm block 2 to integrally hold an accelerator pedal 13 and a base block 7 to support the arm block 2 in a state of being free to revolve the accelerator pedal 13 around a revolution axis 100 as its center. The accelerator pedal unit 1 is provided with a roughly flat plate type hysteresis block 4 constituted to receive an energizing force of a return spring 41 and transmit it to a receiver 22, to rotate by receiving a reaction force from the receiver 22 and to work a contact load in correspondence with the size of the reaction force to the side of the base block 7. The receiver 22 on the accelerator pedal unit 1 has a rotation supporting part 221 to hold the hysteresis block 4 in a state of being free to rotate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an accelerator pedal unit for an automobile that is operated by a foot of a driver who drives the automobile.

  2. Description of the Related Art Conventionally, there is an automobile equipped with an accelerator pedal that is operated by a driver's foot to control the throttle opening of an engine. As an accelerator pedal unit, there is an electronic type that outputs an electric signal in accordance with an amount of depression of an accelerator pedal, in addition to a mechanical type that drives an accelerator wire connected to a throttle link cam.

  As an operation characteristic of the accelerator pedal, it is preferable that an appropriate depression force is required to depress the accelerator pedal so that excessive depression can be avoided before starting or accelerating. On the other hand, it is preferable that the reaction force acting on the driver's foot from the accelerator pedal is suppressed to some extent so that the amount of depression of the accelerator pedal can be maintained substantially constant after the driving vehicle reaches the target speed. If the above operation characteristics are compatible, it is possible to realize an accelerator pedal unit that is excellent in operation feeling and can control the traveling speed of the automobile with high safety.

  In order to achieve the mutually contradictory operating characteristics of securing the pedaling force when depressing the accelerator pedal as described above and suppressing the reaction force when maintaining the amount of depression of the accelerator pedal constant, it acts on the accelerator pedal. It is necessary to provide a hysteresis characteristic between the stepping force and the depression amount. In particular, some electronic accelerator pedal units with low mechanical friction include a separate hysteresis mechanism as a source of frictional force that is the basis of the hysteresis characteristics.

  As such an accelerator pedal unit, for example, as shown in FIGS. 14 and 15, an accelerator arm 94 that integrally holds an accelerator pedal 93 and has an arm base end 92 at the other end, and an arm base end There is an accelerator pedal unit 9 that includes a return spring 941 that biases 92 and a friction piece 95 that transmits the biasing force of the return spring 941 to the arm base end portion 92 (see, for example, Patent Document 1).

  In the accelerator pedal unit 9, the friction piece 95 and the arm base end portion 92 are in contact with each other via inclined surfaces 920 and 950 facing each other. According to the abutting structure between the inclined surfaces 920 and 950, the urging force of the return spring 941 is urged toward urging the friction piece 95 and the arm base end 92 outward (in the direction of the arrow in FIG. 15). Can be converted.

  Here, in the accelerator pedal unit 9, the friction piece 95 and the like are accommodated in a gap formed by both side walls 97 of the housing, which is a housing. Therefore, in the accelerator pedal unit 9, the friction piece 95 and the like are pressed against the side wall 97 based on the urging force of the return spring 941, thereby generating a frictional force. In the accelerator pedal unit 9 described above, a hysteresis characteristic is realized based on the frictional force generated in this way.

  However, the accelerator pedal unit 9 having the conventional hysteresis mechanism has the following problems. That is, there is a problem that it is difficult to pre-assemble the friction piece 95 that comes into contact with the arm base end portion 92 via the inclined surfaces 920 and 950, and the assembling property of the accelerator pedal unit 9 may not be sufficiently improved.

JP 2005-239047 A

  The present invention has been made in view of the above-described conventional problems, and in an accelerator pedal unit for an automobile equipped with a hysteresis mechanism, it is intended to provide an accelerator pedal unit that improves assembly and suppresses production costs. Is.

The present invention includes an arm block that integrally holds an accelerator pedal, a base block that supports the arm block in a state where the accelerator pedal is rotatable about a rotation axis, and the accelerator pedal is directed to an initial position. An accelerator pedal unit including a return spring that exerts an urging force for pushing back, and a receiving portion on which the urging force of the return spring acts is separated from the rotation shaft in the radial direction, and is provided on the arm block.
The urging force of the return spring is received and transmitted to the receiving portion, and rotated by a reaction force from the receiving portion so that a contact load corresponding to the magnitude of the reaction force acts on the base block side. It has a generally flat plate-shaped his block configured,
The receiving portion may be an accelerator pedal unit for an automobile having a rotation support portion for holding the his block in a rotating state.

  The accelerator pedal unit of the present invention has the His block that rotates by receiving the reaction force from the receiving portion. The his block is configured to abut against the base block side by its rotation and to act on the abutment load. According to the accelerator pedal unit including the his block, the friction force can be generated according to the contact load applied to the base block side by the his block. And according to this frictional force, a favorable hysteresis characteristic can be given to the relationship between the depression force for depressing the accelerator pedal and the depression amount.

  The receiving portion of the arm block in the accelerator pedal unit includes the rotation support portion for holding the his block in a rotatable state. According to this rotation support portion, it is possible to easily and reliably assemble the his block with respect to the arm block. Therefore, the arm block can be handled in a state where the his block is assembled. Therefore, the accelerator pedal unit has high productivity that can be efficiently manufactured by assembling the arm block in a state where the his block is assembled in advance to the base block.

  As described above, in the accelerator pedal unit of the present invention, the His block can be assembled in advance to the arm block. Therefore, the accelerator pedal unit can be easily assembled, and the production cost can be suppressed.

  In the present invention, the structure in which the his block applies a contact load to the base block side includes a structure in which the his block directly contacts the base block, and an intermediate member held by the base block. Various structures such as a structure in which a contact load acts on the base block indirectly by contacting the block can be employed.

  Further, in the arm block of the accelerator pedal, the receiving portion is disposed away from the rotating shaft in the radial direction. According to the accelerator pedal unit including the arm block, it is possible to suppress the dimension in the width direction, that is, the direction of the rotation shaft. Therefore, it is possible to place it in a narrow space left between the brake pedal, clutch pedal, etc. of the tire house that houses the front tire, and the accelerator pedal unit mounted on the vehicle Excellent in properties.

Further, it is preferable that the his block has a shaft hole at the center of rotation, and the rotation support portion has a shaft-shaped engagement pin inserted into the shaft hole. ).
In this case, the His block can be held in the receiving portion with high reliability by interposing the engaging pin in the shaft hole. And if the said arm block which assembled | attached the said hiss block with high certainty is utilized, it will become possible to produce the said accelerator pedal unit further with workability | operativity.

Further, the receiving portion has an inclined arm-side cam that gradually decreases in a protruding amount in a rotational direction in which the his block rotates according to the reaction force, and the his block is in the rotational direction. It has an inclined his side cam that gradually expands toward the
It is preferable that the arm side cam and the hiss side cam are configured so that a rotational torque corresponding to the reaction force acts on the his block.

  In this case, based on the combination of the arm side cam and the hiss side cam, the rotational torque according to the urging force acting on the his block from the return spring can be generated. Therefore, a contact load having a magnitude corresponding to the urging force acting on the his block from the return spring can be applied to the base block side from the his block.

  As the support structure of the His block by the rotation support portion, instead of the support structure by the combination of the engagement pin and the shaft hole, a structure for supporting the His side cam from the inner peripheral side, A structure in which the side cam is supported from the outer peripheral side, a structure in which the hysteresis cam is supported from the inner peripheral side and the outer peripheral side, and the like can be employed. Furthermore, it is possible to adopt a support structure in which the structure for supporting the hiss cam as described above and the support structure using the engagement pins are combined.

In addition, it is preferable that a plurality of the arm side cams and the hiss side cams are provided so as to be substantially equidistant on substantially the same circumference.
In this case, the load acting on each arm side cam can be balanced.

  For example, when the arm side cam and the hiss side cam are provided at two locations facing each other via the rotating shaft, a load having the same size and a reverse direction is applied to each arm side cam. Can do. Further, for example, when the arm-side cam and the hiss-side cam are provided every 90 degrees around the rotation shaft, the two opposite arm-side cams have the same size and opposite directions. The load can be applied. Further, for example, when the arm side cam and the hiss side cam are provided every 120 degrees around the rotation shaft, the size is the same and the direction of action is 120 degrees for each arm side cam. Different loads can be applied in a balanced manner.

  Thus, if a load can be applied to each arm-side cam in a well-balanced manner, it is possible to suppress the possibility of an unbalanced load acting on the arm block. Further, by suppressing the unbalanced load acting on the arm block, it is possible to suppress the possibility that troubles such as uneven wear occur in members around the rotating shaft.

  In addition, the base block has side walls that face each other across the his block in the rotation axis direction, and the his block contacts the side walls by rotation according to the reaction force. It is preferable to be configured so as to contact (claim 5).

  In this case, a contact load can be applied equally from the His block to each of the side wall portions, whereby the reaction load acting on the His block from the base block side can be balanced. Therefore, the possibility that an unbalanced load acts on the arm block from the His block can be suppressed in advance, and uneven wear around the rotating shaft that can be caused by the unbalanced load can be reduced. Therefore, the accelerator pedal unit has excellent durability that can maintain its excellent characteristics over a long period of use.

In addition, the base block has an outer peripheral sliding surface positioned radially outward from the His block and an inner peripheral sliding surface positioned radially inner than the His block with respect to the rotation axis, and the His block It is preferable that the block is configured to contact the outer peripheral sliding surface and the inner peripheral sliding surface by rotation according to the reaction force.
In this case, the reaction load acting on the His block from the base block side can be balanced by applying a contact load equally from the His block to the outer peripheral sliding surface and the inner peripheral sliding surface. . Therefore, the possibility that an unbalanced load acts on the arm block from the His block can be suppressed in advance.

In addition, it is preferable that the His block has a substantially rectangular flat plate shape and has a friction surface in contact with the base block side on an outer peripheral surface forming a corner portion thereof.
In this case, the contact load can be applied to the base block side via the friction surface provided at a corner portion of the His block having a substantially rectangular shape.

Example 1
This example is an example related to an accelerator pedal unit 1 for an automobile provided with a hysteresis mechanism 10. The contents will be described with reference to FIGS.
As shown in FIGS. 1 to 4, an automobile accelerator pedal unit 1 (hereinafter simply referred to as “accelerator pedal unit 1”) of this example includes an arm block 2 that integrally holds an accelerator pedal 13, and a rotating shaft 100. And a base block 7 that supports the arm block 2 in a state where the accelerator pedal 13 is rotatable, and a return spring 41 that applies a biasing force for pushing the accelerator pedal 13 back toward the initial position. In the accelerator pedal unit 1, the receiving portion 22 on which the urging force of the return spring 41 acts is provided on the arm block 2 away from the rotating shaft 100 in the radial direction.
The accelerator pedal unit 1 receives the urging force of the return spring 41 and transmits it to the receiving portion 22, and is rotated by the reaction force from the receiving portion 22, and a contact load corresponding to the magnitude of the reaction force is used as a base. A His block 4 configured to act on the block 7 side is provided.
The receiving portion 22 in the accelerator pedal unit 1 has a rotation support portion 221 for holding the his block 4 in a rotatable state.
Hereinafter, this content will be described in detail.

  As shown in FIGS. 1, 4, and 5, the accelerator pedal unit 1 is an electronic type that measures the rotation angle of the arm block 2 in a non-contact manner using a magnetic field measuring element 60. In the accelerator pedal unit 1, the magnetic field measuring element 60 is disposed in the hollow portion 33 of the support shaft 3 having a hollow structure, and the magnet body 69 is disposed in the arm block 2. The magnet body 69 can turn the outer periphery of the magnetic field measuring element 60 in accordance with the operation of the accelerator pedal 13. The accelerator pedal unit 1 is configured to detect the rotation angle of the accelerator pedal 13, that is, the amount of depression, by measuring the rotation angle of the magnet body 69 using the magnetic field measuring element 60. .

  As shown in FIGS. 1 to 4, the accelerator pedal unit 1 of the present example houses an arm block 2 that integrally holds an accelerator pedal 13 via a pedal rod 12, and accommodates the arm block 2 in a rotatable state. A base block 7, a support shaft 3 that rotatably supports the arm block 2, and a return spring 41 that biases the arm block 2 toward a return position that is an initial position. In particular, the accelerator pedal unit 1 of this example includes a hysteresis mechanism 10 including the receiving portion 22 and the his block 4.

  Here, the hysteresis mechanism 10 of the accelerator pedal unit 1 will be briefly described. As shown in FIGS. 1, 4, 6 and 7, the hysteresis mechanism 10 includes a his block 4 having a substantially rectangular plate shape, a receiving portion 22 which rotatably supports the his block 4, a his block 4 and a receiving portion. And a return spring 41 that applies a biasing force to the receiving portion 22. In FIG. 6, the base block 7 is omitted.

  In this hysteresis mechanism 10, as shown in FIGS. 1, 4, 6, and 7, the receiving portion 22 that rotatably supports the his block 4 rotates in the gap between the side wall 713 and the side wall 723 of the base block 7 facing each other. Move. When the receiving portion 22 rotates, the urging force of the return spring 41 increases, and accordingly, rotational torque is generated in the his block 4. When the flat rectangular block 4 rotates, the friction surfaces 431 to 434 provided at the corners thereof come into contact with the side walls 713 and 723, and a frictional force is generated.

  The hysteresis mechanism 10 of this example is a mechanism that realizes hysteresis characteristics based on the frictional force generated as described above. The structure for generating rotational torque in the his block 4 according to the urging force of the return spring 41 or the internal structure of the base block 7 that houses the his block 4 will be described in detail later.

  First, as shown in FIGS. 1 to 3, the accelerator pedal 13 is a pedal for an automobile driver to operate with his / her foot. The accelerator pedal 13 has a resin surface 131 provided with unevenness for preventing slippage on the substantially flat surface side. Further, the accelerator pedal 13 has a rod fixing portion 132 for fixing the pedal rod 12 on the back side of the resin surface 131.

  The pedal rod 12 is a highly rigid rod made of iron, and is bent so as to have a substantially L shape as a whole. One end 121 of the pedal rod 12 is formed along the back surface of the accelerator pedal 13 and is configured to be fixable to the rod fixing portion 132. The other end 122 is configured to be fixed to the arm block 2.

  As shown in FIGS. 1, 4, and 5, the arm block 2 includes a bearing portion 23 that has a shaft hole 230 that penetrates the support shaft 3, a rod fixing portion 24 that is disposed with the bearing portion 23 interposed therebetween, and a receiving portion. Part 22. The rod fixing portion 24 is a portion configured to fix the pedal rod 12 extending from the accelerator pedal 13. The receiving portion 22 is a portion configured so that the urging force of the return spring 41 acts. The arm block 2 of this example is formed by molding a nylon resin, which is a nonmagnetic material.

  As shown in FIGS. 1 and 4, the rod fixing portion 24 is a portion formed so as to protrude from the bearing portion 23 to the outer peripheral side. The rod fixing portion 24 has a width in the direction of the rotating shaft 100 substantially equal to the width in the axial direction of the bearing portion 23. And the rod fixing | fixed part 24 has the groove-shaped slit 241 for accommodating and fixing the edge part 122 of the pedal rod 12 in the position which hits the approximate center of an axial direction. In the rod fixing portion 24, the outer peripheral surface corresponding to the depression direction of the accelerator pedal 13 constitutes a contact surface 248. The contact surface 248 is a surface for restricting the maximum depression amount of the accelerator pedal 13 by contact with the base block 7.

  As shown in FIGS. 1 and 4, the bearing portion 23 of the arm block 2 is a portion in which a shaft hole 230 that penetrates the support shaft 3 is formed. In this example, the rotating shaft 100 is constituted by the insertion structure of the shaft hole 230 and the support shaft 3. In particular, the bearing portion 23 of this example is formed by insert-molding a magnet body 69 on the outer peripheral side of the shaft hole 230.

  As shown in FIGS. 4 and 5, the magnet body 69 has a substantially prismatic shape made of neodymium. In this example, the magnet body 69 is arranged so that the polarization direction (magnetization direction) of the magnet body 69 substantially coincides with the radial direction around the rotation shaft 100. As the magnet body 69, ferrite, alnico, samarium cobalt, or the like can be used instead of neodymium in this example.

  As shown in FIGS. 1, 4, 6, and 7, the receiving portion 22 includes a rotation support portion 221 (in this example, an engagement pin) that supports the rotation of the his block 4 on the surface of the his block 4. (Hereinafter referred to as an engagement pin 221) and an arm-side cam 222 that generates rotational torque of the his block 4. The engagement pin 221 is a shaft-shaped portion having a substantially circular cross section, and is provided so as to protrude from the receiving portion 22. The engaging pin 221 is configured to be inserted into a shaft hole 40 provided at a substantially central portion of the his block 4.

  The arm side cams 222 are cam ridges of the same specification provided at four substantially equal intervals with the engaging pin 221 as the center. Each arm-side cam 222 is a cam crest having an inclined shape in which the protruding amount gradually increases clockwise from the distal end side of the engagement pin 221 toward the base side. If the rotation direction of the his block 4 according to the reaction force of the receiving portion 22 is used as a reference, it can be expressed as an arm-side cam 222 having an inclined shape in which the protrusion amount gradually decreases in the rotation direction. Each arm side cam 222 corresponds to a hiss side cam 422 (described later) provided on the hiss block 4.

As shown in FIGS. 1 to 5, the base block 7 includes a case 71 having a space for accommodating the arm block 2 and a cover 72 that forms a lid for the case 71.
The case 71 has a side wall 713 that forms the bottom surface thereof, and an outer peripheral wall 719 that stands from the outer peripheral portion of the side wall 713. A through hole 715 for penetrating the support shaft 3 is drilled in the side wall 713. On the inner side of the case 71, a curved concave outer peripheral sliding surface 714 is provided along a rotation locus of a friction surface 434 (described later) of the his block 4. A bracket portion 711 for attaching the accelerator pedal unit 1 to the vehicle body side is provided on the outer peripheral side of the case 71.

  As shown in FIGS. 1 and 4, the outer peripheral wall 719 has a missing portion 718 that is interrupted at a part in the circumferential direction. The missing part 718 in the accelerator pedal unit 1 that is a finished product forms a rotation space for the pedal rod 12 and the like to rotate. One of the outer peripheral walls 719 adjacent to the missing portion 718 forms a receiving surface 712 with which the contact surface 248 of the arm block 2 abuts. Further, the end portion of the other outer peripheral wall adjacent to the missing portion 718 in the outer peripheral wall 719 forms a stopper portion 716 that regulates the initial position (return position) of the accelerator pedal 13. In the accelerator pedal unit 1 of this example, the depression stroke of the accelerator pedal 13 is regulated by the receiving surface 712 and the stopper portion 716.

  As shown in FIGS. 1 to 3, the cover 72 has a side wall 723 that forms a cover surface for the case 71. The side wall 723 is provided with a through hole 725 for allowing the support shaft 3 to pass therethrough. In the base block 7 in which the case 71 and the cover 72 are combined, the through hole 715 of the case 71 and the through hole 725 of the cover 72 are positioned on a substantially straight line (normal direction) orthogonal to the side wall 713 and the side wall 723. Yes. A fixing portion 726 for fixing the element block 6 is provided on the surface of the side wall 723 of the cover 72 that forms the outer peripheral side of the accelerator pedal unit 1.

  As shown in FIGS. 1 to 3, the side wall 723 is formed along the axial direction in order to connect the two side walls 723 </ b> A and B having different positions in the direction of the rotation axis 100, and the side walls 723 </ b> A and 723 </ b> B. It consists of a standing wall 723C. Of the surface of the standing wall 723 </ b> C, the surface that forms the inner peripheral side of the accelerator pedal unit 1 has a curved convex inner peripheral sliding surface that follows a rotational trajectory of a friction surface 432 (described later) of the his block 4. 724 is provided.

  As shown in FIGS. 1, 4, 6 and 7, the his block 4 has a substantially rectangular plate shape in which a shaft hole 40 through which the engaging pin 221 provided in the receiving portion 22 passes is provided at a substantially center. It is a plate-shaped member which exhibits. The His block 4 is provided with His side cams 422 which are in contact with the arm side cams 222 at four substantially equal intervals on the same circumference with the shaft hole 40 as the center. The hysteresis side cam 422 is an inclined cam crest that gradually increases in the amount of protrusion clockwise. If the rotation direction of the his block 4 corresponding to the reaction force of the receiving portion 22 is used as a reference, it can also be expressed as an inclined his side cam 422 whose protrusion amount gradually increases in the rotation direction.

  The contact structure between the his-side cam 422 and the arm-side cam 222 reacts according to the load acting between the his-block 4 and the receiving portion 22, that is, the reaction force acting on the his-block 4 from the receiving portion 22. It has a structure that generates clockwise torque. And the his block 4 rotates counterclockwise (rotation direction shown by the arrow in FIG. 7) by the rotational torque based on this contact structure.

  As shown in FIGS. 1, 6, and 7, friction surfaces 431 to 434 that are in contact with the inner peripheral surface of the base block 7 are provided on the four outer peripheral surfaces that form the outer periphery of the his block 4. First, substantially planar friction surfaces 431 and 433 that are in contact with the side wall 713 of the case 71 or the side wall 723 of the cover 72 are provided on the two outer peripheral surfaces along the rotation surface on which the accelerator pedal 13 rotates.

  On the other hand, on the bearing portion 23 side of the two outer peripheral surfaces along the circumferential direction around the rotation shaft 100, a curved concave friction surface that abuts the curved convex inner peripheral sliding surface 724 of the cover 72. 432 is provided. The other outer peripheral surface is provided with a curved convex friction surface 434 that contacts the curved concave outer peripheral sliding surface 714 of the case 71.

  In the hysteresis mechanism 10 of the accelerator pedal unit 1, the friction surfaces 431, 433 of the his block 4 abut against the side walls 713, 723 of the base block 7, and the hysteresis block 4 of the his block 4 contacts the outer peripheral sliding surface 714 of the case 71. The friction surface 434 contacts and the friction surface 432 of the his block 4 contacts the inner peripheral sliding surface 724 of the cover 72.

  As shown in FIGS. 1, 4 and 5, the support shaft 3 is an axial member having a substantially cylindrical cross section made of aluminum which is a nonmagnetic material. The support shaft 3 has a locking portion 31 for locking the push nut 34 at the front end on the case 71 side, and a flange portion 32 having a flange shape at the rear end on the cover 72 side. Further, the support shaft 3 is formed by perforating a hollow portion 33 that is a substantially cylindrical inner circumferential space on the end surface on the flange portion 32 side.

  As shown in FIGS. 1, 4 and 5, the support shaft 3 in the accelerator pedal unit 1 includes a push nut 34 and a washer 35 that engage with a locking portion 31 at the tip, and a flange-like flange portion 32 at the other end. Thus, the entire housing 7 is clamped and fixed. The support shaft 3 of this example constitutes a structural member for fixing the housing 7 and is a non-rotating member. The support shaft 3 penetrates the shaft hole 230 of the arm block 2 (bearing portion 23) and pivotally supports the arm block 2 so as to be rotatable. In this example, as described above, the rotation shaft 100 is configured by the through-hole support structure of the shaft hole 230 and the support shaft 3.

  In the hollow portion 33 of the support shaft 3 in the accelerator pedal unit 1, as shown in FIGS. 1, 4, 5, and 8, an element substrate 61 on which a magnetic field measuring element 60 is mounted (a component of the sensor block 6. (Described later) is interpolated. In the accelerator pedal unit 1, the arrangement of the magnetic field measuring element 60 on the rotating shaft 100 is realized by a structure in which the element substrate 61 is inserted into the hollow portion 33. In this example, when the accelerator pedal 13 is in the initial position (the state shown in FIG. 4), the element substrate 61 is arranged so that the magnetic field direction of the magnet body 69 and the element substrate 61 are substantially parallel. is there.

  As shown in FIGS. 1 to 3, 5, and 7, the sensor block 6 includes a connector socket portion 63 for connecting a vehicle body side connector (not shown), an element substrate 61 on which a magnetic field measuring element 60 is mounted, and an element substrate. And an element cover portion 62 provided with a substrate slot 621 to which 61 is attached. The sensor block 6 is made of a resin material in which a terminal pin 65 that is a conductive member is insert-molded. One end of the terminal pin 65 protrudes inside the connector socket part 63. The other end of the terminal pin 65 is exposed as a shaft-like electrode pin 622 (see FIG. 5) that protrudes into a substrate slot 621 provided inside the element cover portion 62.

  As shown in FIGS. 1, 5, and 8, the element substrate 61 is a printed board that has a substantially T-shape as a whole. The element substrate 61 includes a mounting part 612 on which the magnetic field measuring element 60 is mounted and an electrode part 613 in which an electrode hole 614 in which a conductive foil is provided on the inner peripheral surface of the through hole. The electrode portion 613 is configured to be attachable to the substrate slot 621 in a state where the electrode pin 622 is inserted into the electrode hole 614. In the sensor block 6, the element substrate 61 protrudes so as to stand inward from the element cover portion 62.

  As shown in FIG. 8, the magnetic field measuring element 60 is composed of a linear Hall IC that measures the magnetic flux density acting in a predetermined direction. The magnetic field measuring element 60 has a magnetosensitive surface 605 at the center of the element surface. The magnetic field measuring element 60 outputs a signal voltage having a magnitude corresponding to the magnetic flux density in the normal direction of the magnetosensitive surface 605. In addition to the linear Hall IC of this example, a Hall effect IC, a Hall element, a magnetoresistive element, or the like can be adopted as the magnetic field measuring element 60.

  In the element substrate 61 of this example, as shown in FIG. 8, two magnetic field measuring elements 60 are arranged along the longitudinal direction of the mounting portion 612. In the accelerator pedal unit 1 of this example, the two magnetic field measuring elements 60 are equally offset (W / 2) with respect to the symmetry axis M forming the magnetic field center of the magnet body 69 (see FIGS. 4 and 5). The insertion position of the magnet body 69 in the arm block 2 and the mounting position of the magnetic field measuring element 60 on the element substrate 61 are set. In the element substrate 61, the magnetic field measuring element 60 is mounted so that the magnetic sensitive surfaces 605 face the same direction.

  In this example, as shown in FIGS. 8 and 9, the two magnetic field measuring elements 60 are connected in parallel to the common power source. Further, as described above, the two magnetic field measuring elements 60 are mounted on the element substrate 61 so that the magnetic sensitive surface 605 faces the same direction. Therefore, in the accelerator pedal unit 1 of the present example, the two magnetic field measuring elements 60 output substantially the same signal voltage (see FIG. 11; signal voltages indicated by reference numerals 60A and 60B in the figure). ). In the accelerator pedal unit 1 of this example, by providing two magnetic field measuring elements 60 that output substantially the same signal voltage, a fail-safe function for a trouble that may occur in the magnetic field measuring element 60 is secured. .

  In the accelerator pedal unit 1 manufactured by assembling the above-described components, the arm block 2 is rotatably supported by the support shaft 3 that penetrates the housing 7 as shown in FIGS. 1, 4, and 5. In the accelerator pedal unit 1, the pedal rod 12 that integrally connects the accelerator pedal 13 and the arm block 2 can be rotated via a missing portion 718 provided on the outer periphery of the housing 7.

Next, the electrical or magnetic operation of the accelerator pedal unit 1 configured as described above will be briefly described with reference to FIGS. 4 and 10 to 12.
The signal voltage output from the accelerator pedal unit 1 of the present example changes according to the depression amount of the accelerator pedal 13 as shown in FIG. In the figure, the horizontal axis represents the rotation angle θ of the arm block 2, and the vertical axis represents the signal voltage of the magnetic field measuring element 60. Furthermore, the hatched angle range in the figure indicates an angle range in which the arm block 2 can rotate (in this example, set to 25 degrees). In the figure, reference numerals 60A and 60B indicate signal voltages output from the magnetic field measuring elements 60.

  For example, as shown in FIGS. 4, 11, and 12, when the displacement of the accelerator pedal 13 is zero, the magnet body 69 is located at the symbol P <b> 1 in FIG. 12. At this time, the magnetic field direction of the magnet body 69 and the magnetic sensitive surface 605 are substantially parallel, and the magnetic flux density in the normal direction of the magnetic sensitive surface 605 becomes substantially zero. Therefore, the signal voltage output from the magnetic field measuring element 60 is substantially zero. On the other hand, as shown in FIGS. 10 to 12, when the arm block 2 is rotated according to the displacement of the accelerator pedal 13 and the magnet body 69 is positioned at the symbol P <b> 2 in FIG. 12, the magnetic field direction is rotated and the magnetosensitive surface 605 is rotated. The magnetic flux density in the normal direction changes. If the magnetic flux density generated by the magnet body 69 is B, the magnetic flux density B1 in the normal direction of the magnetosensitive surface 605 is B × sin θ.

Next, the mechanical operation of the accelerator pedal unit 1 configured as described above will be described with reference to FIGS. 4, 6, 7, 10, and 13.
First, in the accelerator pedal unit 1 in the initial state, the accelerator pedal 13 is returned to the original position by the urging force of the return spring 41 as shown in FIG. At this time, the initial position (return position) of the accelerator pedal 13 is regulated by the contact between the rod fixing portion 24 and the stopper portion 716 of the base block 7.

  When a pedaling force is applied to the accelerator pedal 13, the arm block 2 rotates against the urging force of the return spring 41 as shown in FIG. 10, and the receiving portion 22 rotates about the rotation shaft 100. When the receiving portion 22 rotates, the return spring 41 is compressed, and the biasing force gradually increases. If it does so, the contact load between the his block 4 and the receiving part 22 will become large, and the reaction force which acts on the his block 4 from the receiving part 22 will become large.

  In the accelerator pedal unit 1 of the present example, the reaction force acting on the his block 4 from the receiving portion 22 rotates through the contact structure between the his side cam 422 and the arm side cam 222 as shown in FIGS. Converted to torque. When the his block 4 is rotated in the direction of the arrow in FIG. 7 by this rotational torque, the friction surfaces 431 to 434 provided at the corners thereof abut against the side walls 713 and 723 or the sliding surfaces 714 and 724 of the base block 7, A contact load is applied to the block 7.

  That is, the rotational torque is converted into a contact load acting on the base block 7 via the his block 4. This contact load is based on the biasing force of the return spring 41 and can be approximately proportional to the magnitude. Therefore, in the accelerator pedal unit 1 of this example, the contact load having a magnitude corresponding to the amount of depression of the accelerator pedal 13 is generated. And the hysteresis mechanism 10 of this example utilizes the frictional force based on this contact load.

  Here, in the hysteresis mechanism 10 of this example, the load which acts between the his block 4 and the arm block 2 is demonstrated using FIG. In the figure, the base block 7 is omitted. A situation is assumed in which the his block 4 rotates counterclockwise (rotation direction indicated by symbol R in the figure) and the contact loads f1 to f4 act on the base block 7 side from the friction surfaces 431 to 434. At this time, clockwise loads F <b> 1 to F <b> 4 act on each arm-side cam 222 as a reaction against the arm block 2.

  Here, as described above, the friction surfaces 431 to 434 of the his block 4 have the same distance from the rotation center. Therefore, the contact loads f1 to f4 are all the same size. Further, each arm side cam 222 is arranged on substantially the same circumference around the engaging pin 221 that rotatably supports the his block 4. Therefore, the loads F1 to F4 acting on the arm side cams 222 are all the same size. The loads F1 to F4 differ by 90 degrees only in the direction of action.

  When the load F1 and the load F3 are compared, the acting directions are 180 degrees different, and the loads have the same magnitude. Further, when the load F2 and the load F4 are compared, the acting directions are 180 degrees different from each other, and the loads have the same magnitude. That is, the loads F1 to F4 act on the arm block 2 with a good balance.

  Here, the moment acting on the rotating shaft 100 due to the loads F1 to F4 will be examined. The load F2 has a distance K1 from the rotating shaft 100 to the action point. Therefore, the clockwise moment F2 × K1 acts on the rotating shaft 100 due to the load F2. The load F4 has a distance K2 from the rotating shaft 100 to the action point. Therefore, the counterclockwise moment F4 × K2 acts on the rotation shaft 100 due to the load F4. For the loads F1 and F3, the distance from the engagement pin 221 to the action point is D. Therefore, clockwise moments F1 × D and F3 × D act on the rotating shaft 100 due to the loads F1 and F3.

  If it does so, the clockwise moment which acts on the rotating shaft 100 will be F2 * K1-F4 * K2 + F1 * D + F3 * D. Here, since F1 = F2 = F3 = F4, if all these loads are F, then moment = F × (K1−K2) + 2 × F × D. Furthermore, since K1−K2 = 2 × D, moment = 4 × F × D.

  On the other hand, as shown in FIGS. 14 and 15, in the conventional accelerator pedal unit, if a load of 4 × F, which is the sum of the loads F1 to F4, is applied to a position away from the rotation shaft (K2 + D), the rotation shaft 100 On the other hand, a moment of 4 × F × (K2 + D) = 4 × F × K2 + 4 × F × D acts. That is, according to the accelerator pedal unit 1 of this example, when the same hysteresis characteristic is to be realized, the moment that acts on the rotating shaft 100 and can cause uneven wear of the support shaft 3 can be remarkably suppressed. . Therefore, it is possible to reduce the strength required for the members constituting the rotating shaft 100 and to suppress uneven wear and the like that may occur in the members constituting the rotating shaft 100.

  As described above, the accelerator pedal unit 1 of this example includes the engagement pin 221 for rotatingly supporting the his block 4. According to the engagement pin 221, the his block 4 can be easily and reliably assembled to the arm block 2. Therefore, the arm block 2 can be handled in a state where the his block 4 is assembled, and the assembling work to the base block 7 can be performed efficiently.

  Furthermore, in the accelerator pedal unit 1 of this example, the moment acting on the rotating shaft 100 is significantly reduced as described above. Therefore, it is possible to reduce the strength required for the members constituting the rotating shaft 100 and to suppress uneven wear and the like that may occur in the members constituting the rotating shaft 100. Thereby, the accelerator pedal unit 1 of this example can avoid troubles caused by uneven wear around the rotating shaft 100 and the like, and has excellent characteristics that can provide an excellent operational feeling over a long period of use. It will be prepared.

  Moreover, in the accelerator pedal unit 1 of this example, the receiving part 22 is provided away from the rotating shaft 100 in the radial direction. Thereby, in the accelerator pedal unit 1, the dimension of the width direction, ie, the direction of the rotating shaft 100, is reduced in size. The accelerator pedal unit 1 can be disposed in a narrow space left between a protruding portion of a tire house that houses a front tire and a brake pedal or a clutch pedal. It is an excellent one.

FIG. 3 is an assembly diagram illustrating an assembly structure of components of an accelerator pedal unit according to the first embodiment. 1 is a front view showing an accelerator pedal unit in Embodiment 1. FIG. The side view which shows the accelerator pedal unit in Example 1. FIG. Sectional drawing which shows the cross-section of the accelerator pedal unit in Example 1 (AA sectional view taken on the line AA in FIG. 1). Sectional drawing which shows the cross-section of the accelerator pedal unit in Example 1 (BB sectional view taken on the line in FIG. 3). Explanatory drawing explaining the contact structure of a his block and a receiving part in Example 1. FIG. Sectional drawing which shows the cross-section structure around a his block in Example 1 (CC sectional view taken on the line CC in FIG. 4). 1 is a perspective view showing an element substrate in Example 1. FIG. FIG. 3 is a circuit diagram showing a peripheral circuit of the magnetic field measuring element in the first embodiment. Sectional drawing which shows the cross-sectional structure of the accelerator pedal unit at the time of depressing the accelerator pedal in Example 1 (equivalent to the AA arrow directional cross-sectional view in FIG. 1). 3 is a graph showing a signal voltage output from a magnetic field measurement element in Example 1. Explanatory drawing explaining the principle in Example 1 which the magnetic field measurement element measures the rotation angle of a magnet body. Explanatory drawing explaining the load which acts on a receiving part in Example 1. FIG. Sectional drawing which shows the cross-section of the conventional accelerator pedal unit. Sectional drawing which shows the hysteresis mechanism of the conventional accelerator pedal unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Accelerator pedal unit 10 Hysteresis mechanism 100 Rotating shaft 2 Arm block 22 Receiving part 23 Bearing part 24 Rod fixing part 3 Support shaft 33 Hollow part 4 His block 40 Shaft hole 41 Return spring 7 Base block 71 Case 72 Cover

Claims (7)

An arm block that integrally holds the accelerator pedal, a base block that supports the arm block in a state in which the accelerator pedal is rotatable around a rotation axis, and for pushing the accelerator pedal back toward an initial position. An accelerator pedal unit including a return spring that exerts an urging force, and a receiving portion on which the urging force of the return spring acts is radially separated from the rotation shaft and provided in the arm block;
The urging force of the return spring is received and transmitted to the receiving portion, and rotated by a reaction force from the receiving portion so that a contact load corresponding to the magnitude of the reaction force acts on the base block side. It has a structured his block,
The accelerator pedal unit for an automobile, wherein the receiving portion includes a rotation support portion for holding the his block in a rotatable state.   In Claim 1, The said his block has a shaft hole in the rotation center, The said rotation support part has a shaft-shaped engagement pin inserted in the said shaft hole, It is characterized by the above-mentioned. Accelerator pedal unit for automobiles. 3. The receiving block according to claim 1, wherein the receiving portion has an inclined arm-side cam whose projection amount is gradually reduced in a rotation direction in which the his block rotates in response to the reaction force. Has a slanted his side cam that gradually increases in the amount of protrusion toward the rotational direction,
2. The accelerator pedal unit for an automobile according to claim 1, wherein the arm side cam and the hiss side cam are configured to act on the his block with a rotational torque corresponding to the reaction force.   4. The accelerator pedal unit for an automobile according to claim 3, wherein a plurality of said arm side cams and said hiss side cams are provided at substantially equal intervals on substantially the same circumference.   5. The base block according to claim 1, wherein the base block has side wall portions that face each other across the his block in the rotation axis direction, and the his block receives the reaction force. An accelerator pedal unit for an automobile, wherein the accelerator pedal unit is configured to abut against each of the side wall portions by a corresponding rotation.   6. The base block according to claim 1, wherein the base block has an outer peripheral sliding surface positioned radially outward from the His block and an inner peripheral slide positioned radially inner with respect to the rotation shaft. And the His block is configured to come into contact with the outer peripheral sliding surface and the inner peripheral sliding surface by rotation according to the reaction force. Accelerator pedal unit.   In any one of Claims 1-6, the said His block is exhibiting the flat substantially rectangular shape, and has the friction surface which contact | abuts the said base block side in the outer peripheral surface which makes the corner | angular part. An accelerator pedal unit for automobiles.

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