JP2017026500A - Load sensor and pedal load detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precise load sensor or the like capable of suppressing a change in sensor sensitivity to a load.SOLUTION: A projection 13c is formed on an inner wall surface of a second mount member 13. Thus, a contacting part between the second mount member 13 and a crevice pin 6b is located at a tip position of the projection 13c, thus preventing the contacting part between the second mount member 13 and the crevice pin 6b from changing even if the arrangement relationship between the crevice pin 6b and the second mount member 13 is not constant because of some sort of factors. In a radial direction of the second mount member 13, a contacting position between the second mount member 13 and a strain member 11, and the projection 13c are aligned in a line. As a result, torque occurs at the contacting part of the second mount member 13 with the crevice pin 6b, thus suppressing rotation of the second mount member 13. Therefore, a change in sensor sensitivity to a load can be suppressed, thus improving precision of a load sensor 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a load sensor that detects a load applied to a brake pedal and the like and a pedal load detection device.

  Conventionally, in Patent Document 1, an operation pedal device for a vehicle including a load sensor that detects a pedaling force applied to a brake pedal has been proposed. The load sensor provided in this vehicle operation pedal device is configured to be able to use a clevis pin or the like conventionally used for a brake pedal as it is, and to be compact and inexpensive.

  Specifically, in the vehicle operation pedal device, the brake pedal and the operating rod of the brake booster are connected to each other via a connecting portion including a clevis so as to be relatively rotatable. A through hole is formed in the brake pedal, and a pedal force applied to the brake pedal is input to the operating rod through the clevis pin by inserting the clevis pin into the through hole. In such a configuration, a through hole of the brake pedal is used as a sensor mounting hole, and a load sensor is provided in the sensor mounting hole.

  The load sensor includes a strain-generating member serving as a cylindrical detection member on which an element for detecting load is formed, an annular first mounting member disposed on the outer peripheral side of the strain-generating member, and an inner peripheral side of the strain-generating member. The first mounting member and the second mounting member are connected to each other via a strain generating member. The first attachment member is attached to the sensor attachment hole of the brake pedal, and the second attachment member is disposed around the clevis pin.

  In the load sensor having such a configuration, when the first mounting member is moved in accordance with the movement of the brake pedal, the load from the operating rod side is applied to the clevis and the clevis pin, and the second mounting member of the first mounting member. The position relative to changes. Then, the amount of change in the relative position of the first mounting member and the second mounting member changes according to the pedaling force applied to the brake pedal, and is provided between the first mounting member and the second mounting member in accordance with the change. The strain generating member is distorted. Therefore, the pedal force applied to the brake pedal can be detected by taking out the strain amount of the strain generating member as an electrical signal.

Japanese Patent No. 4339349

  However, in the load sensor having the above-described structure, the positional relationship between the clevis pin and the annular second mounting member is constant due to factors such as the shape accuracy of the brake pedal, mounting variation, deformation of the operating rod and clevis, wear of the clevis pin, etc. Not necessarily.

  For example, in FIGS. 6A to 6C, when the arrangement relationship between the clevis pin J2 and the second mounting member J3 provided in the clevis J1 is an ideal state, the second mounting is performed with respect to the central axis of the clevis pin J2. A case where the central axis of the member J3 is inclined and a case where the inclination is large are shown. In these drawings, only the second mounting member J3 of the load sensor is shown, and the first mounting member and the strain generating member are not shown.

  As shown in FIG. 6 (a), the second mounting member J3 is arranged so that the clevis pin J2 provided in the clevis J1 is inserted, and in the ideal state, the second mounting member with respect to the central axis of the clevis pin J2. It arrange | positions so that the central axis of J3 may become parallel. In this ideal state, when the load sensor moves based on the pedaling force applied to the brake pedal and the second mounting member J3 contacts the clevis pin J2, the inner surface of the second mounting member J3 is brought into surface contact. It is done. For this reason, when a load from the operating rod side is applied to the second mounting member J3 via the clevis J1 and the clevis pin J2, the load is applied evenly in the central axis direction of the second mounting member J3. Therefore, it is possible to apply a force in parallel to the radial direction to the strain generating member (not shown), and the pedaling force can be accurately detected.

  However, when the central axis of the second mounting member J3 is inclined with respect to the central axis of the clevis pin J2 as shown in FIGS. 6B and 6C due to the various factors described above, the clevis pin J2 is moved. It will be made to contact in the state biased with respect to the inner wall surface of the 2nd attachment member J3. For example, as shown in FIG. 6B, when the second mounting member J3 is tilted, the clevis pin J2 and the second mounting member J3 come into contact with each other only in the portion A in the figure. Further, when the inclination of the second mounting member J3 is large, as shown in FIG. 6 (c), the second mounting member J3 is also brought into contact with the B portion in the drawing in addition to the A portion in the drawing.

  In such a case, since the location of the load application point when a load is applied changes, the load sensor's fulcrum (that is, the connecting portion), the force point (load application point), and the action point ( The balance of the strain generating member) changes, and the load applied to the strain generating member changes. Therefore, the sensor sensitivity changes greatly due to a slight angle deviation between the central axis of the second mounting member and the central axis of the clevis pin in the load sensor.

  An object of this invention is to provide the accurate load sensor and pedal load detection apparatus which can suppress the change of the sensor sensitivity with respect to a load in view of the said point.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an element configured with a cylindrical shape having one direction as an axial direction, which is distorted according to an applied load and outputs an electric signal corresponding to the strain. A strain generating member, an annular first mounting member that is joined to one end side in the axial direction with respect to the strain generating member and is moved according to an applied load, and a strain generating member. An annular second mounting member that is joined to the other end side in the axial direction and has a second through hole smaller than the first through hole, and the second mounting member includes: A convex portion as a load receiving point is provided on the inner wall surface of the second through hole, and the joining position and the convex portion of the second mounting member and the strain generating member are aligned in a straight line in the radial direction of the second mounting member. And the joining position of the second mounting member and the strain generating member and the convex portion are the second mounting member. It is characterized by having a structure that is consistent with the axial position.

  Thus, the convex part is formed in the inner wall surface of the 2nd attachment member. For this reason, even if the contact part of a 2nd attachment member and a connection pin turns into a convex part, and the arrangement relationship of a connection pin and a 2nd attachment member is not constant, the contact part of a 2nd attachment member and a connection pin does not change. . Therefore, a change in load applied to the strain generating member can be suppressed, a change in sensor sensitivity of the load sensor can be suppressed, and the accuracy can be improved.

  Further, in the radial direction of the second mounting member, the joining position and the convex part of the second mounting member and the strain generating member are aligned on a straight line, and the joining position of the second mounting member and the strain generating member is When the convex portion is configured to coincide with the axial position of the second mounting member, it is possible to suppress generation of torque at a contact portion of the second mounting member with a connecting pin such as a clevis pin. Therefore, when the second mounting member is moved along with the application of the load, the second mounting member is moved horizontally with respect to the radial direction of the connecting pin, and a force can be applied horizontally to the strain generating member. . Thereby, the strain of the strain generating member with respect to the applied load becomes a strain as expected in the design, and the accuracy of the load sensor can be further improved.

  According to a second aspect of the present invention, in the pedal load detection device, the load sensor is formed in a cylindrical shape having one direction as an axial direction, and is distorted according to an applied load and outputs an electric signal corresponding to the distortion. A strain generating member having an element to be connected, an annular first mounting member that is joined to one end side in the axial direction with respect to the strain generating member, is moved along with the movement of the pedal, and has a first through hole, A second member that is joined to the other end side in the axial direction with respect to the strain member and that inserts the connecting pin and that forms an inner wall surface that receives the load when a load is applied to the connecting pin as the pedal moves. An annular second mounting member having a through-hole, and the connecting pin is provided with a convex portion as a load receiving point for receiving a load, and in the radial direction of the second mounting member, The joint position with the strain member and the convex part are in a straight line. And de, and is characterized by having a structure in which the bonding position and the projections of the second mounting member and the strain-generating member is coincident with the axial position of the second attachment member.

  Thus, even if it has a structure which provided the convex part in the connection pin side, the contact part of a 2nd attachment member and a connection pin turns into a convex part. Moreover, the joining position and convex part of a 2nd attachment member and a strain generation member are located in a line, and the joining position and convex part of a 2nd attachment member and a strain generation member are the 2nd attachment member. By adopting a structure that coincides with the position in the axial direction, it is possible to suppress the generation of torque at a contact portion of the second mounting member with a connecting pin such as a clevis pin. Therefore, an effect similar to that of the first aspect can be obtained.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows an example of a corresponding relationship with the specific means as described in embodiment mentioned later.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the pedal load detection apparatus provided with the load sensor concerning 1st Embodiment of this invention. It is the figure which showed the cross section and master cylinder which are equivalent to the II-II cross section of FIG. 1 in the vicinity of a load sensor. It is sectional drawing which shows a mode when a load is applied with respect to the load sensor. It is the figure which showed the case where the joining position of a 2nd attachment member and a distortion | straining member and the formation position of the convex part formed in the 2nd attachment member are not located in a straight line, (a) is a state before a load is added (B) is sectional drawing which showed the mode when a load was added. It is sectional drawing of the vicinity of the load sensor in the pedal load detection apparatus concerning 2nd Embodiment of this invention. (A)-(c) is sectional drawing which showed the mode when the arrangement | positioning relationship between a clevis pin and a 2nd attachment member is an ideal state, respectively, when a central axis has inclination, and the inclination is large. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
FIG. 1 shows an overall configuration of a pedal load detection device 1 provided with a load sensor 10 according to an embodiment of the present invention. FIG. 2 shows a cross section in the vicinity of the load sensor 10 and the like.

  As shown in FIG. 1, the pedal load detection device 1 has a load sensor 10 attached to a brake pedal 2 provided in a vehicle brake device. The brake pedal 2 shown in FIG. 1 is depressed by a driver, presses the rod 3 according to the depressed state, and transmits a force to the master cylinder 4 side. Here, a vehicle brake device of a boosterless type is illustrated. In this type, the push rod in the master cylinder 4 corresponds to the rod 3. Of course, the vehicle brake device may be of a type provided with a brake booster. In this case, the operating rod in the brake booster corresponds to the rod 3.

  The brake pedal 2 is moved according to an applied load, and includes a pedal portion 2a and a lever portion 2b. The load sensor 10 is attached to the lever part 2b of these.

  The brake pedal 2 is swingably connected to the mounting stay 5 via a coupling member 5a such as a bolt. The brake pedal 2 is attached to the vehicle body by attaching the attachment stay 5 to the vehicle body (not shown).

  And the brake pedal 2 and the rod 3 are connected via the connecting part 6 so that relative rotation is possible. Specifically, the connecting portion 6 includes a clevis 6a, a clevis pin 6b corresponding to the connecting pin, and the like, and the brake pedal 2 and the rod 3 are connected to each other by attaching the clevis pin 6b to the clevis 6a.

  As shown in FIG. 2, an attachment hole 2c is formed in the brake pedal 2, and a clevis pin 6b is inserted into the attachment hole 2c. As shown in FIG. 2, the clevis 6a is composed of a U-shaped member having a bottom portion 6c connected to the rod 3 and a side wall portion 6d protruding from both sides of the bottom portion 6c in the opposite direction to the rod 3. The clevis pin 6b is fitted in the insertion hole 6e provided in the side wall portion 6d. And the lever part 2b is arrange | positioned so that it may be pinched | interposed into the both-side wall part 6d of the clevis 6a, In the state arrange | positioned so that the attachment hole 2c of the lever part 2b and the insertion hole 6e of the both-side wall part 6d of the clevis 6a may oppose. The brake pedal 2 and the rod 3 are connected via the connecting portion 6 by inserting the clevis pin 6b.

  In such a configuration, the mounting hole 2c of the brake pedal 2 is used for mounting the load sensor 10, and the load sensor 10 is provided in the mounting hole 2c.

  The load sensor 10 includes a strain-generating member 11, a first attachment member 12, and a second attachment member 13.

  The strain generating member 11 constitutes a detection member on which an element for detecting a load is formed, and is constituted by, for example, a cylindrical member. A wiring 11a shown in FIG. 1 is connected to the strain generating member 11, and a driving voltage can be applied, a ground potential point can be connected, and an electric signal can be output through the wiring 11a.

  For example, the strain generating member 11 is configured by forming an element that generates an electrical output corresponding to strain on the surface of an annular resin. For example, a strain resistance element such as a piezoresistor can be used as an element that generates an electrical output corresponding to the strain.

  As will be described later, when the relative positions of the first mounting member 12 and the second mounting member 13 change based on the load applied to the brake pedal 2, the strain generating member 11 is elastically deformed accordingly. For example, the resistance value of the strain resistance element is changed by this elastic deformation. By taking out this resistance value change as an electric signal, the load applied to the brake pedal 2, that is, the pedaling force is detected.

  For example, the strain resistance element is configured by assembling a Wheatstone bridge circuit in which a bridge circuit in which two strain resistances are connected in series is connected in parallel. The two strain resistances provided in each bridge circuit are applied with compressive stress and tensile stress in accordance with the deformation of the strain-generating member 11, and the strain resistance element has two strain resistances of each bridge circuit. The intermediate potential is output as an electrical signal corresponding to the load. Specifically, the two strain resistances provided in each bridge circuit are arranged such that in one bridge circuit, the strain resistance to which compressive stress is applied is arranged on the high side, and the strain resistance to which tensile stress is applied is arranged on the low side. In the circuit, the strain resistance to which tensile stress is applied is arranged on the high side, and the strain resistance to which compressive stress is applied is arranged on the low side. For this reason, the load is detected by taking out the intermediate potential of each bridge circuit and taking the potential difference between the intermediate potentials.

  The 1st attachment member 12 is comprised by the cyclic | annular member in which the through-hole 12a in which the clevis pin 6b was penetrated was joined to the axial direction one end side of the strain generating member 11 was formed. Specifically, as shown in FIG. 2, the first mounting member 12 formed of an annular member is joined to the strain-generating member 11 by bonding or the like at an inner peripheral position of one end surface.

  Moreover, the 1st attachment member 12 is being fixed with respect to the lever part 2b. In the present embodiment, the first attachment member 12 is directly attached and fixed in the attachment hole 2c of the lever portion 2b by press-fitting or bonding, but may be attached directly to the lever portion 2b. For example, you may attach to the lever part 2b via other members, such as a fixing member which comprises a pedal fixing surface.

  The second attachment member 13 is joined to the other end in the axial direction of the strain-generating member 11, that is, the end opposite to the end to which the first attachment member 12 is attached, and a through hole 13a through which the clevis pin 6b is inserted. It is comprised with the formed annular member. Specifically, as shown in FIG. 2, the second mounting member 13 formed of an annular member is joined to the strain-generating member 11 by bonding or the like at the outer peripheral position of one end surface.

  The minimum diameter of the through hole 13 a formed in the second mounting member 13 is smaller than the minimum diameter of the through hole 12 a formed in the first mounting member 12. For this reason, the clevis pin 6b inserted through each of the through holes 12a and 13a contacts the inner wall surface of the second mounting member 13 and does not contact the first mounting member 12, or more than the second mounting member 13. It has a structure that comes into contact later.

  The second mounting member 13 includes a protruding portion 13 b that protrudes in the axial direction on the side of the joint surface with the strain-generating member 11. For this reason, the axial dimension of the second mounting member 13 is made larger on the inner peripheral side of the second mounting member 13 than on the outer peripheral side. And the convex part 13c formed by partially reducing an internal diameter rather than another part is formed in the inner wall surface of the 2nd attachment member 13. As shown in FIG. When this convex part 13c transmits the load applied from the brake pedal 2 to the clevis pin 6b, it functions as a load receiving point that receives the load applied from the clevis pin 6b side.

  In the case of the present embodiment, the cross-sectional shape of the convex portion 13c is a triangular shape having the minimum inner diameter position of the convex portion 13c as a vertex. That is, the inner diameter of the second mounting member 13 is reduced from one of the end surfaces in the axial direction of the second mounting member 13 to the top of the convex portion 13c so as to be reduced in a straight line in cross section, and from the top of the convex portion 13c to the second mounting member 13. It is extended to the other end of the axial direction end surface in a straight line shape. Hereinafter, in the cross section of FIG. 2, a straight line extending from one of the axial end faces of the second mounting member 13 to the vertex of the convex portion 13 c is L1, and a straight line extending from the convex portion 13 c vertex to the other of the axial end surfaces of the second mounting member 13. Is called L2.

  Although the inclination angles of the straight lines L1 and L2 with respect to the axial direction of the second mounting member 13 are arbitrary, the central axis of the second mounting member 13 and the center of the clevis pin 6b that are assumed to be a variation in mounting the load sensor 10 to the brake pedal 2 It is preferable to make it larger than the angle deviation from the shaft.

  The position of the convex portion 13c in the axial direction of the second mounting member 13, preferably the position of the tip position of the convex portion 13c (the apex of the convex portion 13c in the cross-sectional shape) is the joining of the second mounting member 13 and the strain generating member 11 It is the position that is. For this reason, when drawing the virtual straight line X which passes along the convex part 13c in the radial direction of the 2nd attachment member 13, the joining position of the 2nd attachment member 13 and the distortion member 11 and the convex part 13c are located in a straight line. In addition, in the axial direction of the second mounting member 13, the joining position of the second mounting member 13 and the strain generating member 11 and the position of the convex portion 13 c coincide with each other.

  In addition, the minimum inner diameter of the through hole 13a in the second mounting member 13, that is, the minimum inner diameter at the tip position of the convex portion 13c is set to be larger than the diameter of the clevis pin 6b.

  The pedal load detection apparatus 1 provided with the load sensor 10 according to the present embodiment is configured by the above structure. The pedal load detection device 1 configured as described above detects the load applied to the brake pedal 2 by performing the following operation.

  First, when the brake pedal 2 is depressed by the driver, the brake pedal 2 is swung around the coupling member 5a, whereby the pedal portion 2a is moved in the forward direction of the vehicle. Along with this, the clevis pin 6b inserted into the mounting hole 2c of the lever portion 2b is pressed against the lever portion 2b via the load sensor 10, whereby the clevis 6a and the rod 3 are pushed forward of the vehicle. As a result, a piston (not shown) disposed in the master cylinder 4 is pushed, and a master cylinder pressure is generated.

  And since the load sensor 10 is provided in the site | part by which the clevis pin 6b is pushed by the lever part 2b, from the rod 3 and the clevis 6a in other words, the pressing load to the clevis pin 6b by the lever part 2b with respect to the load sensor 10 The load which becomes the reaction force of is added. As a result, as shown in FIG. 3, the second mounting member 12 comes into contact with the clevis pin 6b and is moved relative to the first mounting member 12 mounted on the lever portion 2b. The strain generating member 11 disposed between the mounting member 13 is distorted. Thereby, since the resistance value of the strain resistance element provided in the strain generating member 11 changes, the load applied to the brake pedal 2, that is, the pedaling force is detected by taking out the change in resistance value as an electric signal. Can do.

  At this time, in the present embodiment, the convex portion 13 c is formed on the inner wall surface of the second mounting member 13. For this reason, the contact part of the 2nd attachment member 13 and the clevis pin 6b turns into the front-end | tip position of the convex part 13c. Even if the positional relationship between the clevis pin 6b and the second mounting member 13 is not constant due to factors such as the shape accuracy and mounting variation of the brake pedal 2, deformation of the rod 3 and clevis 6a, wear of the clevis pin 6b, etc., the second The contact portion between the attachment member 13 and the clevis pin 6b does not change.

  Therefore, even if the central axis of the second mounting member 13 is inclined with respect to the central axis of the clevis pin 6b due to the various factors described above, the contact portion between the second mounting member 13 and the clevis pin 6b is the tip position of the convex portion 13c. The location of the load application point that becomes the power point is constant. Thereby, the balance of the fulcrum (that is, the connecting portion), the force point (load application point), and the action point (strain member 11) of the load sensor 10 can be prevented from changing, and the change in the load applied to the strain member 11 can be suppressed. . Therefore, it is possible to suppress a change in sensor sensitivity of the load sensor 10, and it is possible to improve accuracy.

  Moreover, in the load sensor 10 of this embodiment, in the radial direction of the 2nd attachment member 13, the joining position of the 2nd attachment member 13 and the strain generation member 11, and the convex part 13c have a structure on a straight line. . Preferably, the tip position of the convex portion 13 c that is the minimum inner diameter of the through hole 13 a in the second mounting member 13 is straight with the joining position of the second mounting member 13 and the strain-generating member 11 in the radial direction of the second mounting member 13. They are arranged on a line and coincide with the joining position of the second mounting member 13 and the strain generating member 11 in the axial direction of the second mounting member 13. For this reason, it can suppress that a torque generate | occur | produces in the contact part with the clevis pin 6b among the 2nd attachment members 13, and the 2nd attachment member 13 is rotated.

  For example, as shown in FIG. 4, in the radial direction of the second mounting member 13, the joining position of the second mounting member 13 and the strain generating member 11 and the convex portion 13 c are not aligned in a straight line. Suppose.

  As shown in FIG. 4A, in the radial direction of the second mounting member 13, when the joining position of the second mounting member 13 and the strain-generating member 11 and the convex portion 13c are not aligned in a straight line, the second In the direction of the central axis of the mounting member 13, there is a deviation between the joint portion between the second mounting member 13 and the strain-generating member 11 and the tip position of the convex portion 13 c. Therefore, when the second mounting member 13 contacts the clevis pin 6b and transmits the load of the brake pedal 2, as shown in FIG. 4 (b), the second mounting member 13 contacts the clevis pin 6b. Torque is generated. Therefore, the second mounting member 13 is rotated so that the central axis of the second mounting member 13 is inclined with respect to the central axis of the clevis pin 6b.

  On the other hand, as in this embodiment, in the radial direction of the second mounting member 13, if the joining position of the second mounting member 13 and the strain-generating member 11 and the convex portion 13 c are arranged in a straight line. In the second mounting member 13, the generation of torque at the contact portion with the clevis pin 6b is suppressed.

  Therefore, when the second mounting member 13 is moved along with the application of the load, the second mounting member 13 is moved horizontally with respect to the radial direction of the clevis pin 6b, so that a force is applied to the strain generating member 11 horizontally. Can be. Thereby, the distortion of the strain generating member 11 with respect to the applied load becomes a distortion as designed, and the accuracy of the load sensor 10 can be further improved.

(Second Embodiment)
A second embodiment of the present invention will be described. In this embodiment, the shape of the clevis pin 6b and the second mounting member 13 is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Only explained.

  As shown in FIG. 5, in the present embodiment, the inner wall surface of the second mounting member 13 has a structure in which the convex portion 13 c is not formed, that is, a structure in which the inner diameter of the second mounting member 13 is constant. And the convex part 6ba which expanded the outer diameter of the clevis pin 6b partially is provided in the position corresponding to the 2nd attachment member 13 among the clevis pins 6b. More specifically, the joint portion between the strain-generating member 11 and the second mounting member 13 is aligned in the radial direction of the second mounting member 13 and the strain-generating member 11 and the second mounting member 13 are aligned in the axial direction of the second mounting member 13. The convex part 6ba is provided in the position which corresponds to a joining position with the 2 attachment member 13. As shown in FIG. The protrusion 6ba may be formed integrally with the clevis pin 6b or may be formed as a separate part.

  Thus, the convex portion 6ba is provided on the clevis pin 6b side, and the convex portion 6ba is aligned with the joint portion of the strain-generating member 11 and the second mounting member 13 in the radial direction of the second mounting member 13, and the first 2 In the axial direction of the mounting member 13, the joining position of the strain-generating member 11 and the second mounting member 13 is matched. Preferably, the tip position of the convex portion 6ba is aligned with the joining position of the strain-generating member 11 and the second mounting member 13 in the radial direction of the second mounting member 13, and the axial direction of the second mounting member 13 In FIG. 2, the joining position between the strain-generating member 11 and the second mounting member 13 is made to coincide.

  Even in such a structure, even if the central axis of the second mounting member 13 is inclined with respect to the central axis of the clevis pin 6b due to the various factors described above, the contact portion between the second mounting member 13 and the clevis pin 6b is the convex portion 6ba. The position of the load application point that is the power point is constant. Thereby, the balance of the fulcrum (that is, the connecting portion), the force point (load application point), and the action point (strain member 11) of the load sensor 10 can be prevented from changing, and the change in the load applied to the strain member 11 can be suppressed. . Therefore, it is possible to suppress a change in sensor sensitivity of the load sensor 10, and it is possible to improve accuracy. Moreover, it can suppress that a torque generate | occur | produces in the contact part with the clevis pin 6b among the 2nd attachment members 13, and the 2nd attachment member 13 is rotated. Therefore, even with the structure of the present embodiment, the same effect as that of the first embodiment can be obtained.

(Other embodiments)
The present invention is not limited to the embodiment described above, and can be appropriately changed within the scope described in the claims.

  For example, the materials and shapes of the strain-generating member 11, the first mounting member 12, and the second mounting member 13 are merely examples, and can be changed as appropriate. For example, although the convex part 13c as a load receiving point formed on the inner wall surface of the through hole 13a in the second mounting member 13 has a pointed shape, the point is not necessarily sharp. For example, the tip may be rounded. Moreover, the convex part 13c does not need to be formed in the structure inclined like the straight lines L1 and L2 over the whole inner wall surface of the through-hole 13a, and only a part of the inner wall surface of the through-hole 13a is protruded. The convex part 13c may be formed.

  Further, in the load sensor 10 having the structure described in each of the above embodiments, the load applied to the clevis pin 6b from the brake pedal 2 is received by the strain-generating member 11, but an excessive load is applied to the strain-generating member 11. You can choose not to join. For example, the protrusion amount of the second mounting member 13 is increased so that the outer peripheral surface of the protruding portion 13 b faces the inner wall surface of the first mounting member 12, and the clearance between the protruding portion 13 b and the first mounting member 12 is increased. Accordingly, the load applied to the strain generating member 11 may be limited.

  Moreover, although the example which detects the load applied to the brake pedal 2 as the pedal load detection device 1 has been described as an example, this is only an example. For example, the present invention can also be applied to a pedal load detection device 1 that detects the load of another pedal that is moved in accordance with an applied load, such as an accelerator pedal.

  DESCRIPTION OF SYMBOLS 1 ... Pedal load detection apparatus, 2 ... Brake pedal, 2a ... Pedal part, 2b ... Lever part, 2c ... Mounting hole, 3 ... Rod, 4 ... Master cylinder, 5 ... Mounting stay, 5a ... Connection member, 6 ... Connection part 6a ... Clevis, 6b ... Clevis pin, 6ba ... Projection, 6c ... Bottom, 6d ... Side wall, 6e ... Insertion hole, 10 ... Load sensor, 11 ... Strain member, 11a ... Wiring, 12 ... First mounting member, 12a ... through hole, 13 ... second mounting member, 13a ... through hole, 13b ... projection, 13c ... projection

Claims (2)

A strain generating member having a cylindrical shape having an axial direction as one direction and having an element that distorts according to an applied load and outputs an electrical signal according to the strain;
An annular first mounting member that is joined to one end side in the axial direction with respect to the strain-generating member and is moved according to an applied load, and has a first through-hole,
An annular second attachment member joined to the other end side in the axial direction with respect to the strain-generating member and having a second through hole smaller than the first through hole,
The second mounting member is provided with a convex portion as a load receiving point on the inner wall surface of the second through hole,
In the radial direction of the second mounting member, the joining position of the second mounting member and the strain-generating member and the convex portion are aligned in a straight line, and the second mounting member and the strain-generating member are The load sensor has a structure in which the joint position and the convex portion coincide with each other in the axial position of the second mounting member. A pedal that is moved in accordance with an applied load and has a mounting hole;
A connecting pin inserted through the mounting hole;
A load sensor that is attached to the attachment hole and detects a load applied to the connecting pin as the pedal moves,
The load sensor is
A strain generating member having a cylindrical shape having an axial direction as one direction and having an element that distorts according to an applied load and outputs an electrical signal according to the strain;
An annular first mounting member that is joined to one end side in the axial direction with respect to the strain-generating member, is moved along with the movement of the pedal, and has a first through hole;
It is joined to the other end side in the axial direction with respect to the strain generating member, and the connecting pin is inserted, and when the load is applied to the connecting pin as the pedal moves, the internal force receiving the load An annular second mounting member having a second through-hole constituting a wall surface,
The connecting pin is provided with a convex portion as a load receiving point for receiving the load,
In the radial direction of the second mounting member, the joining position of the second mounting member and the strain generating member and the convex portion are aligned in a straight line, and the second mounting member and the strain generating member The pedal load detection device is characterized in that the joining position of the first and second projections coincide with each other in the axial position of the second mounting member.

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