JP2012035770A - Pedal operation amount detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pedal operation amount detected when a connection pin is brought into contact with one end of an elongated hole from being dispersed in a pedal operation amount detection device in which the relative displacement of an input member and an output member is prevented by bringing the connection pin into contact with one end of the elongated hole.SOLUTION: The stopper (one end) 28e of the elongated hole 28 includes a straight line L linearly extending in the direction at a right angle to a direction in which the elongated hole 28 and the clevis pin (connection pin) 26 are displaced relative to each other (in the longitudinal direction of the elongated hole 28), and the clevis pin 26 is brought into contact with the straight line L at all times. Therefore, even if an operation pedal 16 is depressed by a large pedal operation force F and the clevis pin 26 is brought into contact with the stopper 28e, the maximum displacement amount St1 is not dispersed. Consequently, the relative displacement amount St obtained when a depressing operation is performed by a pedal operation force F equal to or larger than a predetermined value is equal to a specified maximum displacement amount St1, and the detection accuracy of the pedal operation amount obtained based on the relative displacement amount St is improved.

Description

  The present invention relates to a pedal operation amount detection device, and more particularly to a technique for preventing variation in pedal operation amount detected when a pedal operation is performed with a large pedal operation force.

  (a) an input member to which a pedal operation force is applied; (b) an output member to which the pedal operation force is transmitted from the input member and a reaction force corresponding to the pedal operation force is applied; A connecting pin having a circular cross section provided on one of the input member and the output member, a long hole provided on the other of the input member and the output member and engaged with the connecting pin, and the above-mentioned applied to the input member An elastic member that allows the input member and the output member to be relatively displaced so that the connecting pin moves in the longitudinal direction of the elongated hole by being elastically deformed according to a pedal operation force; A movable coupling mechanism that prevents a certain amount of relative displacement of the input member and the output member by being brought into contact with one end portion of the elongated hole, and (d) the pedal operation A pedal operation amount detection device that electrically detects a deformation amount of the elastic member that is elastically deformed in accordance with an operation force or a relative displacement amount between the input member and the output member is, for example, a pedal operation of a brake pedal for a vehicle. It has been proposed as a device for detecting force and stepping stroke. The apparatus described in Patent Documents 1 and 2 is an example. In Patent Document 1, the relative displacement amount between the input member and the output member is electrically detected by a displacement sensor, and in Patent Document 2, the elastic member (bar-shaped member 40) is detected. The amount of deformation (strain) is electrically detected by a strain gauge.

  FIG. 4A is a schematic diagram for explaining an example of such a conventional pedal operation amount detection device. The operation pedal 100 for the service brake 100 that is depressed in the left direction by the pedal operation force F is shown in FIG. A connecting pin 102 is fixed perpendicularly to a plane of movement of the operation pedal 100 (a plane parallel to the paper surface of FIG. 4), while an operating rod 104 to which a brake reaction force R by hydraulic pressure or the like is applied is provided. A long hole 106 is provided, and the connecting pin 102 is engaged with the long hole 106. The operating rod 104 is urged in the direction opposite to the brake reaction force R by an elastic member 108 such as a disc spring disposed between the operating pedal 100 and an initial portion which is one end in the longitudinal direction of the long hole 106. Although the connecting pin 102 is held in the initial state in which the position end 106s comes into contact with the position end 106s, when the pedal operating force F is applied to the operating pedal 100, the elastic member is generated by the brake reaction force R generated in response to the pedal operating force F. 4 is displaced relative to the connecting pin 102 in the right direction in FIG. 4 while being elastically deformed. Since the relative displacement amount St corresponds to the pedal operation force F, by detecting the relative displacement amount St using a displacement sensor such as a magnetic sensor, the pedal operation force F, Alternatively, the depression stroke of the operation pedal 100 can be obtained. Further, when a large pedal operation force F is applied, when the connecting pin 102 reaches the stopper portion 106e, which is the other end portion of the long hole 106, as shown by the alternate long and short dash line, the operation pedal 100 and the operating rod 104 are more than that. The relative displacement St is prevented from being excessively deformed or damaged, and the relative displacement St is maintained at the maximum displacement St1 at which the connecting pin 102 abuts against the stopper portion 106e. In this example, the operation pedal 100 corresponds to an input member, the operating rod 104 corresponds to an output member, and the stopper portion 106e corresponds to one end portion.

US Pat. No. 5,563,355A JP 2000-103325 A

  By the way, the elongated hole 106 has an elliptical shape, and the stopper portion 106e has a semicircular arc shape. On the other hand, the elongated direction is perpendicular to the longitudinal direction of the elongated hole 106, that is, the connecting pin 102 and the elongated hole 106. In the direction perpendicular to the relative displacement direction (the vertical direction in FIG. 4B), the connecting pin 102 is allowed to move in the longitudinal direction of the long hole 106 regardless of the dimensional error of each part. A predetermined play is provided. For this reason, there may be a case where relative movement is possible only to the position indicated by the broken line in FIG. 4B due to the sliding resistance between the connecting pin 102 and the long hole 106, and the maximum displacement St2 in this case is one point. As indicated by the chain line, the error ΔSt becomes smaller than the maximum displacement St1 when the connecting pin 102 comes into contact with the center portion of the semicircular arc shape of the stopper portion 106e. As described above, even if the pedal operation is performed with the same pedal operation force, the maximum displacement amounts St1 and St2 are different, and the pedal operation amount (the pedal operation force F and the depression stroke) obtained from the maximum displacement amounts St1 and St2 is different. In addition, there is a case where the relative displacement St of the error ΔSt with respect to the maximum displacement St1 cannot be detected.

  The present invention has been made in the background of the above circumstances, and its object is to prevent a relative displacement between the input member and the output member by bringing the connecting pin into contact with one end of the elongated hole. In the operation amount detection device, the detection accuracy is improved by preventing variation in the pedal operation amount detected when the connecting pin is brought into contact with one end of the elongated hole.

  In order to achieve such an object, the first invention provides (a) an input member to which a pedal operating force is applied, and (b) the pedal operating force is transmitted from the input member and corresponds to the pedal operating force. An output member to which a reaction force is applied; (c) a connection pin having a circular cross section provided on one of the input member and the output member; and a connection pin provided on the other of the input member and the output member. The input member and the output member so that the connecting pin moves in the longitudinal direction of the elongated hole by being elastically deformed according to the pedal operation force applied to the input member, and the elongated hole to be engaged And an elastic member that allows relative displacement of the input member, and the connection pin is brought into contact with one end of the elongated hole to prevent a certain amount of relative displacement of the input member and the output member. (D) a pedal that electrically detects a deformation amount of the elastic member that is elastically deformed according to the pedal operation force or a relative displacement amount between the input member and the output member. In the operation amount detection device, (e) the one end portion of the elongated hole includes a linear portion that extends linearly in a direction perpendicular to the direction of relative displacement between the elongated hole and the connecting pin. Regardless of the play between the elongated hole and the connecting pin, the connecting pin is always brought into contact with the straight portion.

  According to a second aspect of the present invention, in the pedal operation amount detection device according to the first aspect of the invention, (a) the elongated hole is continuous with the first slide portion in a direction away from the first slide portion including the one end portion. (B) the width dimension in the direction perpendicular to the relative displacement direction of the elongated hole and the connecting pin is greater than the first slide than the second slide part. (C) the length dimension of the first slide part in the relative displacement direction is smaller than the radius of the connecting pin, and the connecting pin is moved by the second slide part until it abuts the linear part. It is characterized by being guided.

  According to a third aspect of the present invention, in the pedal operation amount detection device according to the first or second aspect of the invention, the connecting pin abuts the inner wall surface of the straight portion at the one end of the elongated hole in the penetration direction of the elongated hole. A retracting portion that smoothly retreats from the abutted position is provided.

  4th invention is the pedal operation amount detection apparatus of 1st invention or 2nd invention, The inner wall surface of the said linear part in the said one end part of the said long hole is the flat provided substantially parallel to the penetration direction of the long hole It is a surface.

  In such a pedal operation amount detection device, one end of the elongated hole of the movable coupling mechanism includes a linear portion extending linearly in a direction perpendicular to the direction of relative displacement between the elongated hole and the coupling pin. Regardless of the play between the elongated hole and the connecting pin in the right-angle direction, the connecting pin is always brought into contact with the straight portion, so that the connecting pin is brought into contact with one end of the elongated hole by a large pedal operation force. The maximum displacement amount or the maximum deformation amount of the elastic member does not vary. As a result, the maximum displacement amount or the maximum deformation amount when the pedal is operated with a large pedal operation force equal to or greater than a predetermined value becomes constant, and the pedal operation amount variation obtained based on the maximum displacement amount or the maximum deformation amount is constant. Is prevented and detection accuracy is improved. In other words, the pedal is based on the relative displacement amount and the deformation amount until the relative displacement amount and the deformation amount are always the constant maximum displacement amount and the maximum deformation amount regardless of variations in the contact position of the connecting pin with respect to the one end. The operation amount can be detected with high accuracy.

  In the second invention, the elongated hole has a first slide part and a second slide part, and the width dimension of the first slide part including the one end is made larger than the width dimension of the second slide part. The corner R can be made relatively large while ensuring a sufficiently long straight portion at one end, and a long hole can be formed easily and inexpensively by punching with a press or the like. Since the connecting pin is guided by the second slide portion until it comes into contact with the linear portion, even if the corner R of the first slide portion is enlarged, the connecting pin comes into contact with the corner R and the maximum displacement amount or the elastic member It is possible to avoid variations in the maximum deformation amount. In addition, since the predetermined gap is formed on both sides of the connecting pin by increasing the width dimension of the first slide part, foreign matter is collected and discharged by the gap, and the connection pin and the linear part It is possible to prevent the detection accuracy from deteriorating due to a foreign object interposed therebetween.

  In the third aspect of the invention, the inner wall surface of the straight portion at one end of the elongated hole is provided with a retracting portion that smoothly retreats from the abutting position where the connecting pin abuts in the penetrating direction of the elongated hole. The foreign matter is collected and discharged by the portion, and it is suppressed that the foreign matter is sandwiched between the connecting pin and the straight portion and the detection accuracy is lowered.

  In the fourth invention, since the inner wall surface of the straight portion at one end of the elongated hole is a flat end surface provided substantially parallel to the penetrating direction of the elongated hole, compared with the case where the retracting portion is provided as in the third invention. Thus, the long hole can be easily formed, and can be manufactured easily and inexpensively by, for example, press working.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining an example of the vehicle operation pedal apparatus for service brakes provided with the pedal operation amount detection apparatus which is one Example of this invention, (a) is a front view, (b) is IB in (a). (C) is an IC-IC cross-sectional view in (b). It is a figure explaining the other Example of this invention, and is sectional drawing equivalent to FIG.1 (c). FIG. 6 is a diagram for explaining still another embodiment of the present invention, in which any of (a) to (c) is a cross-sectional view corresponding to FIG. 1 (b). It is a figure explaining an example of the conventional pedal operation amount detection apparatus, (a) is a front view of a movable connection mechanism part, (b) is a figure explaining position shift when a connection pin contacts one end part of a slot. It is.

  The pedal operation amount detection device of the present invention is preferably used as a device for detecting the pedal operation amount of a vehicle operation pedal such as a brake pedal or an accelerator pedal, that is, a pedal operation force or a depression stroke. It can also be applied to the pedal operation amount detection apparatus. The vehicle operation pedal is configured to mechanically operate a wheel brake or the like, but is electrically operated (by-wire) that electrically controls the wheel brake, the vehicle drive device, and the like according to the electrically detected pedal operation amount. Type) operating pedal device.

  The input member may be the operation pedal itself that is stepped on. However, when the pedal operation force is transmitted through the intermediate lever or the connection link, the intermediate lever or the connection link may be used as the input member. The output member is a member that is connected to such an operation pedal or an intermediate lever through a movable connection mechanism, to which a pedal operation force is transmitted and a reaction force is applied, for example, an operating of a brake booster to which a brake reaction force is directly applied. These are rods and push rods for brake master cylinders. A connection link connected to the operation pedal, an intermediate lever connected to the connection link, or the like can also be used as the output member. In the case of a by-wire type operating pedal device, a reaction force may be applied to the output member by a reaction force mechanism such as a spring.

  The connecting pin and the long hole of the movable connecting mechanism may be provided in one and the other of the input member and the output member, and the connecting pin may be provided in the input member and the long hole may be provided in the output member. May be provided in the output member and a long hole may be provided in the input member. The long hole allows the connecting pin to be relatively displaced according to the pedal operation force and prevents a relative displacement of a certain amount or more, and is formed in a linear or arc shape that is long in the relative displacement direction. The straight part is provided at least at one end, but the other end may have a semicircular arc shape as in the conventional case. When the connecting pin and the elongated hole are relatively displaced in an arc shape, the arc-shaped elongated hole is desirable, but it is also possible to provide a linear elongated hole that can allow the relative displacement. In the initial state before the operation pedal is depressed, when the connecting pin is brought into contact with the end opposite to the one end of the elongated hole, a linear portion similar to the one end may be provided at the end. desirable. When the connecting pin is held at an intermediate position in the longitudinal direction of the elongated hole in the initial state, the shape of the end portion on the opposite side to the one end portion is appropriately determined.

  The elastic member disposed in the movable connecting mechanism transmits the pedal operating force from the input member to the output member by its elasticity, and is elastically deformed according to the pedal operating force, so that the connecting pin becomes the length of the elongated hole. The input member and the output member are allowed to be relatively displaced so as to move in the direction. As this elastic member, a spring member such as a coil spring or a disc spring is preferably used, but an elastic body such as rubber or a magnetic body can also be employed. The rod-shaped member that can be flexibly deformed as described in Patent Document 2 can also be adopted as the elastic member. The elastic member is disposed, for example, between the input member and the output member, but when a swing lever is swingably disposed on one of the input member and the output member and connected to the other so as to be relatively rotatable. An elastic member may be interposed between the swing lever and one member.

  In order to electrically detect the relative displacement amount between the input member and the output member that are relatively displaced according to the pedal operation force, for example, various displacement sensors such as a magnetic sensor, an optical type, and a capacitance type are used. Then, based on the relative displacement amount, for example, a pedal operation amount such as a pedal operation force or a stepping stroke is obtained from a predetermined conversion formula or map. Although the relative displacement amount between the input member and the output member can be directly detected, the relative displacement amount (including the rotation angle and the like) of other portions displaced in accordance with the relative displacement may be detected. . Further, since the elastic member that allows relative displacement between the input member and the output member is deformed in accordance with the relative displacement amount, the deformation amount (compression strain, tensile strain, deflection deformation, etc.) of the elastic member is distorted. The pedal operation amount can also be obtained by detecting with a gauge or the like.

  In the second invention, a long hole having a first slide portion and a second slide portion having different width dimensions is provided. However, when implementing another invention, a long hole such as a rectangle having a certain width dimension is provided. May be. One end where the connecting pin abuts is connected to the straight part regardless of the play between the connecting pin and the slot in the direction perpendicular to the longitudinal direction of the slot (in the case of an arc-shaped slot, the normal direction of the arc) As long as the pin abuts, a predetermined roundness or inclination may be provided at the corners on both sides of the linear portion. The long hole of the second invention can be easily formed by punching with a press by appropriately setting the size of the corner R. However, the long hole is formed by other processing methods such as milling and laser processing. It is also possible to do. Further, it is not always necessary to provide the corner R, and it is possible to adopt a long hole having a substantially right corner.

  In the third invention, a retracting portion is provided on the inner wall surface of the straight portion provided at one end of the elongated hole so that foreign matter is collected and discharged. The flat surface provided substantially parallel to the penetration direction of a long hole like this may be sufficient. For example, a flat inclined surface that is linearly inclined, a curved surface that is curved in an arc shape, or the like is appropriate as the retracting portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an operation pedal device 8 for a service brake of a vehicle provided with a pedal operation amount detection device 10 according to an embodiment of the present invention. FIG. (B) is an enlarged view of the IB-IB cross section in (a), and (c) is an IC-IC cross sectional view in (b). An operation pedal 16 is disposed on a pedal support 12 that is integrally fixed to the vehicle so as to be rotatable around a substantially horizontal support shaft 14. The operation pedal 16 is stepped on by a driver in response to a braking request. A stepped portion (pad) 18 is provided at a lower end portion, and a brake booster is provided at an intermediate portion via a movable connecting mechanism 20. Operating rods 22 are connected. The operating pedal 16 corresponds to an input member to which a pedal operating force F is applied, and the operating rod 22 receives the pedal operating force F from the operating pedal 16 via the movable coupling mechanism 20 and the pedal operating force F. The brake reaction force R corresponding to is equivalent to an output member acted by the brake booster. In the case of a by-wire type operation pedal device that electrically controls the wheel brake, a reaction force member to which a predetermined reaction force is applied by a reaction force mechanism or the like is connected instead of the operating rod 22.

  A bifurcated (U-shaped) clevis 24 is integrally fixed to the end of the operating rod 22 by screw connection or the like, and a cylindrical clevis pin 26 having a circular cross section parallel to the support shaft 14 is provided. It is attached. The operation pedal 16 is provided with a swing lever 30 that can swing around a support pin 32 parallel to the support shaft 14, and the clevis pin 26 is connected to the swing lever 30 so as to be relatively rotatable. The inside of the long hole 28 provided in the operation pedal 16 is inserted. The operation pedal 16 and the swing lever 30 are inserted inside the bifurcated clevis 24, and both ends of the clevis pin 26 protrude to the outside of the operation pedal 16 and the swing lever 30, respectively. It is penetrated and cannot be removed by a snap ring or the like.

  The movable connecting mechanism 20 includes the clevis pin 26, the long hole 28, and the swing lever 30. The long hole 28 is a straight long hole that is long in the axial direction of the operating rod 22, and the clevis pin 26 is In a state having a predetermined play, it can be displaced relative to the operation pedal 16 in the longitudinal direction of the long hole 28. Further, an elastic member 34 made of a spring member such as a compression coil spring or a disc spring is disposed between the swing lever 30 and the operation pedal 16, and the swing lever 30 is connected to the brake reaction force R. By urging in the opposite direction, the clevis pin 26 is maintained in the initial state where it abuts on the initial position end 28s which is one end of the long hole 28 in the longitudinal direction, that is, the left end in FIG. When the pedal operating force F = 0 is not operated, the operating pedal 16, the operating rod 22, and the swing lever 30 are held in this initial state. FIG. 1 shows this initial state. In this embodiment, the clevis pin 26 corresponds to a connecting pin. In this embodiment, the straight elongated hole 28 is provided, but an arc-shaped elongated hole with the support pin 32 as the center may be provided. In any case, the clevis pin 26 can be displaced in the longitudinal direction of the long hole 28 irrespective of the dimensional error of each part, etc., in a direction perpendicular to the relative displacement direction (vertical direction in FIG. 1 (c)). It is provided with a width dimension having a predetermined play.

  In the initial state, when a pedal operation force F is applied to the operation pedal 16, the pedal operation force F is transmitted from the operation pedal 16 to the operating rod 22 from the clevis pin 26 via the elastic member 34 and the swing lever 30. . When the brake reaction force R is applied to the operating rod 22 in response to the pedal operating force F, the clevis pin 26 is separated from the initial position end 28s of the elongated hole 28 while elastically deforming the elastic member 34. The operation pedal 16 and the operating rod 22 are relatively displaced. 1 (c) shows a state in which the clevis pin 26 is relatively displaced with respect to the elongated hole 28 in accordance with the pedal operating force F, and the relative displacement St of the clevis pin 26 at this time is the pedal operating force F. Therefore, by detecting the relative displacement St, the pedal operation force F or the depression stroke of the operation pedal 16 can be obtained from a predetermined conversion formula or map. Since the clevis pin 26 is guided in the elongated hole 28 and is relatively moved in the longitudinal direction of the elongated hole 28, the relative displacement St is the amount of movement of the elongated hole 28 in the longitudinal direction. In order to electrically detect the relative displacement St, the operation pedal 16 is provided with a displacement sensor 36 such as a magnetic sensor. The displacement sensor 36 is connected to the vehicle via a wire harness 38 and a connector 40. The pedal operation force F and the stepping stroke are obtained based on the relative displacement St. In the present embodiment, the pedal operation amount detection device 10 includes the movable coupling mechanism 20 and the displacement sensor 36.

  On the other hand, when a large pedal operating force F greater than a predetermined value is applied, when the clevis pin 26 reaches the stopper 28e, which is the other end of the elongated hole 28, as shown by the dotted line in FIG. Further relative displacement of the pedal 16 and the operating rod 22 is prevented, and excessive deformation or damage of the elastic member 34 is prevented. Thereafter, the clevis pin 26 rotates around the support shaft 14 integrally with the operation pedal 16. It is moved and pushes the operating rod 22 to the left. In this case, the relative displacement St is maintained at the maximum displacement St1 at which the clevis pin 26 contacts the stopper portion 28e. The stopper portion 28e corresponds to one end portion that prevents relative displacement between the operating pedal 16 and the operating rod 22.

  Here, the elongated hole 28 has a rectangular shape in which the corners R at the four corners are smaller than the radius of the clevis pin 26, and the stopper portion 28e with which the clevis pin 26 is brought into contact when a large pedal operating force F is applied is provided. The shape is linear except for the corners at both ends. That is, the clevis pin 26 is relatively displaced in the longitudinal direction of the elongated hole 28, but the stopper portion 28e extends linearly in a direction perpendicular to the relative displacement direction (specifically, a direction passing through the support pin 32). Since the straight portion L is provided, the clevis pin 26 is always brought into contact with the straight portion L reliably. The width dimension of the long hole 28, that is, the vertical dimension in FIG. 1 (c) perpendicular to the relative displacement direction of the clevis pin 26 is larger than the diameter dimension of the clevis pin 26 and is provided with a predetermined play. Regardless of direction play, the clevis pin 26 is always brought into contact with the straight portion L of the stopper portion 28e. The broken line in FIG. 1 (c) shows a state in which the clevis pin 26 is brought into contact with the stopper portion 28e while being in sliding contact with one side wall extending in the longitudinal direction of the elongated hole 28 due to play or vibration of each portion. However, the relative displacement direction St of the relative displacement direction, that is, the position in the left-right direction in FIG. 1C is the same regardless of which portion of the stopper portion 28e abuts, and is a constant maximum displacement amount St1. The initial position end 28s on the opposite side is also provided with a straight portion like the stopper portion 28e, and the clevis pin 26 is always brought into contact with the straight portion.

  Thus, in the pedal operation amount detection device 10 of the present embodiment, the stopper portion 28e of the elongated hole 28 extends linearly in a direction perpendicular to the relative displacement direction between the elongated hole 28 and the clevis pin 26. Since the clevis pin 26 is always brought into contact with the straight portion L regardless of the play between the elongated hole 28 and the clevis pin 26 in the right-angle direction, the operation pedal 16 is depressed with a large pedal operation force F. The maximum amount of displacement St1 when the clevis pin 26 abuts against the stopper portion 28e does not vary. As a result, the relative displacement St when the pedal is operated with a large pedal operating force F greater than or equal to a predetermined value becomes a constant maximum displacement St1, and variations in the pedal operation amount obtained based on the relative displacement St are prevented. Detection accuracy is improved. In other words, regardless of variations in the contact position of the clevis pin 28 with respect to the stopper portion 28e, the pedal operation amount is accurately determined based on the relative displacement St until the relative displacement St reaches the constant maximum displacement St1. Can be detected.

  In this embodiment, the long hole 28 is provided so as to penetrate the operation pedal 12 in the vertical direction, that is, in the vertical direction in FIG. 1B, and the straight portion L in the stopper portion 28e of the long hole 28 is provided. The inner wall surface is a flat surface parallel to the penetration direction, and the inner wall surface and the side wall in the longitudinal direction of the linear portion of the opposite initial position end 28s are also flat surfaces parallel to the penetration direction. For this reason, the long hole 28 can be easily processed, and can be formed easily and inexpensively, for example, by punching with a press.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts that are substantially the same as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 2 is a cross-sectional view corresponding to FIG. 1C, and the elongated hole 50 is provided with a first slide portion 52 and a second slide portion 54 having different width dimensions. The first slide portion 52 includes a stopper portion 50e against which the clevis pin 26 comes into contact when the operation pedal 16 is depressed with a large pedal operation force F, and has a width dimension larger than that of the second slide portion 54. . Further, the length dimension of the first slide portion 52, that is, the length of the long hole 50 in the longitudinal direction (left-right direction in FIG. 2) is smaller than the radius of the clevis pin 26, and the clevis pin 26 is a stopper portion as shown by a one-dot chain line. It is moved while being guided by the second slide portion 54 in the entire relative movement range including the case where it abuts against 50e. The stopper portion 50e is provided with a straight portion L extending in a direction perpendicular to the longitudinal direction of the elongated hole 50, that is, the relative displacement direction, as in the above-described embodiment, and the clevis pin 26 guided by the second slide portion 54 is Regardless of play with the second slide portion 54, the straight portion L is always brought into contact with the second slide portion 54. The stopper portion 50e corresponds to one end portion. Note that a wide portion similar to the first slide portion 52 can also be provided symmetrically on the initial position end 50s side, for example.

  Thus, also in the present embodiment, since the clevis pin 26 is brought into contact with the linear portion L of the stopper portion 50e, even if the contact position of the clevis pin 26 varies due to play with the elongated hole 50, the relative displacement direction is increased. The positions are the same, and the relative displacement St can always be detected with high accuracy until the constant maximum displacement St1 is reached, as in the previous embodiment. In addition, since the width dimension of the first slide portion 52 is larger than the width dimension of the second slide portion 54, the corner R is made relatively large while ensuring a sufficiently long straight portion L in the stopper portion 50e. The long hole 50 can be formed easily and inexpensively by punching with a press or the like. Since the clevis pin 26 is guided by the second slide portion 54 until it abuts on the straight portion L, even if the corner R of the first slide portion 52 is enlarged, the clevis pin 26 abuts on the corner R and the maximum displacement St1. Can be avoided. Furthermore, since the predetermined gap is formed on both sides (upper and lower in FIG. 2) of the clevis pin 26 by increasing the width dimension of the first slide portion 52, foreign matter is collected and discharged by the gap. In addition, it is possible to suppress a decrease in detection accuracy due to a foreign object sandwiched between the clevis pin 26 and the linear portion L.

  FIG. 3 is a view for explaining still another embodiment of the present invention, and all of (a) to (c) are cross-sectional views corresponding to FIG. 1 (b). Compared to the example, the shape of the elongated hole 28 in the penetrating direction is different. That is, the point that the straight portion L shown in FIG. 1C is provided in the one end portion 28a is the same, but on the inner wall surface of the straight portion L, the penetration direction of the long hole 28, that is, the thickness direction of the operation pedal 16 is provided. In (the vertical direction of each of FIGS. 3 (a) to 3 (c)), retracting portions 60, 62, and 64 are provided that smoothly retreat from the contact position with which the clevis pin 26 is contacted. A pair of retracting portions 60 in FIG. 3 (a) are provided so as to recede symmetrically and obliquely obliquely from the center in the thickness direction of the operation pedal 16 toward the openings on both sides. ) Is provided so as to recede linearly and obliquely from one end to the other end of the operation pedal 16 in the plate thickness direction. Also, a pair of retracting portions 64 in FIG. 3 (c) are provided so as to be curved and retracted symmetrically in a circular arc shape from the center in the plate thickness direction of the operation pedal 16 toward the openings on both sides. As a semicircular arc shape.

  In each of the embodiments shown in FIGS. 3A to 3C, since the straight portion L is provided in the stopper portion 28e, the constant maximum displacement St1 is reached as in the embodiment shown in FIG. The relative displacement St can always be detected with high accuracy. In addition, in these embodiments, the retreating portions 60 and 62 that smoothly retreat from the contact position where the clevis pin 26 is brought into contact with the inner wall surface of the stopper portion 28e having the straight portion L in the penetration direction of the elongated hole 28. 64, the foreign matter is collected and discharged by the retracting portions 60, 62, and 64, and the foreign matter is sandwiched between the clevis pin 26 and the straight portion L, so that the detection accuracy is lowered. It is suppressed.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one Embodiment to the last, This invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  8: Operation pedal device 10: Pedal operation amount detection device 16: Operation pedal (input member) 20: Movable connection mechanism 22: Operating rod (output member) 26: Clevis pin (connection pin) 28, 50: Long hole 28e, 50e: Stopper portion (one end portion) 34: elastic member 52: first slide portion 54: second slide portion 60, 62, 64: retracting portion F: pedal operation force R: brake reaction force (reaction force) St: relative displacement L : Straight section

Claims (4)

An input member to which pedal operation force is applied;
An output member to which the pedal operating force is transmitted from the input member and a reaction force corresponding to the pedal operating force is applied;
In addition to the input member, a connecting pin having a circular cross section provided in one of the input member and the output member, a slot provided in the other of the input member and the output member and engaged with the connecting pin, And an elastic member that allows the input member and the output member to be relatively displaced so that the connecting pin moves in the longitudinal direction of the elongated hole by being elastically deformed according to the pedal operating force. A movable connecting mechanism that prevents a certain amount of relative displacement of the input member and the output member by contacting the connecting pin with one end of the elongated hole;
A pedal operation amount detection device that electrically detects a deformation amount of the elastic member that is elastically deformed according to the pedal operation force or a relative displacement amount between the input member and the output member;
The one end portion of the elongated hole includes a linear portion extending linearly in a direction perpendicular to the relative displacement direction between the elongated hole and the connecting pin, and the play between the elongated hole and the connecting pin in the perpendicular direction is provided. Regardless of whether the connecting pin is always brought into contact with the straight portion, the pedal operation amount detecting device. While the elongated hole has a first slide part including the one end part and a second slide part provided continuously to the first slide part in a direction away from the one end part,
The width dimension in the direction perpendicular to the relative displacement direction between the elongated hole and the connecting pin is larger in the first slide part than in the second slide part,
The length dimension of the said 1st slide part in this relative displacement direction is smaller than the radius of the said connection pin, and this connection pin is guided by the said 2nd slide part until it contact | abuts to the said linear part. The pedal operation amount detection device according to 1. The inner wall surface of the straight portion at the one end of the elongated hole is provided with a retreating portion that smoothly retreats from a contact position where the connecting pin is contacted in the penetration direction of the elongated hole. The pedal operation amount detection device according to claim 1 or 2. 3. The pedal operation amount detection according to claim 1, wherein an inner wall surface of the linear portion at the one end portion of the elongated hole is a flat surface provided substantially parallel to a penetration direction of the elongated hole. apparatus.

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