JP2014194263A - Sensor for linear actuator, linear actuator, non-stage transmission, and motor cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor for linear actuator, a linear actuator, a non-stage transmission, and a motor cycle that suppress structures from being complex and improve detection precision.SOLUTION: A sensor for linear actuator is provided with a resistor 103 fixed to an actuator cover 14; an arm 35 supported rotatably on the actuator cover 14; a return coil spring 102 energizing a tip of the arm 35 in such a direction that the tip comes into contact with an end of a ball screw shaft 12; and a metal brush 113 which is supported on the side of the arm 35 and freely slides on the resistor 103. Rotation-directional output of the arm 35 by thermal deformation of the actuator cover 14 and rotation-directional output of the arm 35 by thermal deformation of a sensor 19 are opposite in direction.

Description

  The present invention relates to a motorcycle, a continuously variable transmission mounted on the motorcycle, a linear actuator applied to the continuously variable transmission, and a linear actuator sensor.

  For example, in a belt type continuously variable transmission for a vehicle (V belt type continuously variable transmission), a belt (V belt) is wound around an input side driving pulley and an output side driven pulley to change the groove width of the pulley. Thus, the contact radius between the belt and the pulley is changed, thereby changing the gear ratio (reduction ratio) steplessly. In this case, in order to make the groove width of the pulley variable, the pulley is constituted by a combination of a fixed sheave and a movable sheave, and the pulley groove width can be changed by moving the movable sheave in the pulley axial direction. An electric actuator is used in a belt type continuously variable transmission for a vehicle to move the movable sheave.

  However, the electric actuator is generally provided with a sensor for detecting the movement amount. However, since the electric actuator including this sensor is disposed in the vicinity of the engine and the transmission, it is easily affected by heat. If the sensor is affected by heat, the housing will thermally expand, making it difficult to accurately detect the amount of movement.

  As a solution to such a problem, for example, there are those described in Patent Documents 1 and 2 below. The rotation angle detection device described in Patent Document 1 encloses the periphery of a magnetically sensitive element with an elastic body and then molds it with a resin member, so that stress due to thermal deformation of the molded resin is not affected by vibration. It is absorbed by an elastic body. In addition, the semiconductor strain sensor disclosed in Patent Document 2 is a connection area for connecting a strain sensor chip to a base plate with a metal material and connecting the sensor chip to the measurement object at two locations sandwiching the joint portion of the sensor chip with the base plate. By providing, thermal deformation can be mitigated by heat dissipation.

JP 2007-010514 A JP 2009-053005 A

  However, in the rotation angle detection device described in Patent Document 1, the magnetic sensing element is surrounded by an elastic body so that stress due to thermal deformation can be absorbed, and the linear motion part and the detection part move in contact with each other. In the structure for detecting the quantity, the detection accuracy is lowered by the elastic body. Moreover, in the semiconductor strain sensor described in Patent Document 2, thermal deformation is alleviated by heat dissipation. However, if the amount of heat dissipation is insufficient, the detection accuracy decreases.

  The present invention solves the above-described problems, and provides a sensor for a linear actuator, a linear actuator, a continuously variable transmission, and a motorcycle that can suppress the complexity of the structure and improve the detection accuracy. Objective.

  In order to achieve the above object, a linear actuator sensor according to the present invention includes an axial displacement element housed in a housing and covered with a cover to constitute a linear actuator, and is attached to the cover to be displaced in the axial direction. In a linear actuator sensor capable of detecting a displacement amount of an element, a resistor fixed to the cover, an arm rotatably supported by the cover, and an end of the arm as an end of the axial displacement element A biasing member that biases in a direction in contact with the sensor and a detector that is supported on the arm side and is slidable with respect to the resistor, and outputs the rotational direction of the arm due to thermal deformation of the cover And the rotation direction output of the arm due to thermal deformation of the sensor are set in opposite directions.

  Therefore, in order to set the rotation direction output of the arm due to the thermal deformation of the cover and the rotation direction output of the arm due to the thermal deformation of the sensor in the opposite direction, the arm outputs a one-way output due to the thermal deformation of the cover. Output in the other direction is generated by thermal deformation, output displacement due to the arm is suppressed against thermal deformation of the cover and sensor, detection accuracy can be improved, and a separate member is almost unnecessary and the structure is complicated. Can be suppressed.

  In the linear actuator sensor of the present invention, the detector is an elastic member, wherein a base end portion is fixed to the arm side, and a tip end portion is pressed by the resistor.

  Therefore, when the sensor is thermally deformed, the distance between the arm and the resistor is increased, so that the detector has a larger support angle while the tip is pressing the resistor, and the contact position with respect to the resistor is shifted, The rotation amount of the arm due to the thermal deformation of the cover is offset by the deviation amount of the contact position of the detector with respect to the resistor.

  The linear actuator sensor according to the present invention is characterized in that a tip of the detector extends in a biasing direction of the arm by the biasing member.

  Therefore, by extending the tip of the detector in the direction in which the arm is urged, the amount of rotation of the arm due to thermal deformation of the cover can be properly offset by the amount of displacement of the contact position of the detector with respect to the resistor.

  In the linear actuator sensor of the present invention, a disk member is fixed to a rotating shaft that is rotatable with respect to the cover, and the arm is fixed to the rotating shaft, while the detector is supported by the disk member. It is characterized by that.

  Therefore, the detector can be properly brought into contact with the resistor by supporting the detector on the disk member integrated with the rotating shaft.

  The linear actuator sensor according to the present invention is characterized in that the resistor and the rotation shaft are supported so as to be relatively movable in the rotation axis direction of the rotation shaft.

  Therefore, by supporting the resistor and the rotation shaft so as to be relatively movable, when the sensor is thermally deformed, the distance between the arm and the resistor is appropriately displaced and becomes longer. This can be canceled by the amount of displacement of the contact position of the detector with respect to the resistor.

  The linear actuator of the present invention includes a housing, a cover that covers the housing, an electric motor accommodated in the housing, a speed reduction mechanism that transmits a rotational force generated by the electric motor, and the speed reduction mechanism. A driving mechanism including a rotating element for inputting a rotational force of an electric motor and an axial displacement element that is displaced in an axial direction in accordance with a rotation amount of the rotating element, and a displacement amount of the axial displacement element in the axial direction are detected. And the sensor.

  Therefore, the sensor arm rotates in one direction due to the thermal deformation of the cover, but it rotates in the other direction due to the thermal deformation of the sensor. In addition, it is possible to suppress the complexity of the structure by eliminating the need for a separate member.

  The continuously variable transmission according to the present invention includes a fixed sheave fixed to a pulley shaft and integrally rotated, a movable sheave supported so as to be movable in the axial direction along the pulley shaft, the fixed sheave, A belt disposed between the movable sheave, the movable sheave is moved in the axial direction to change a pulley groove width, and the actuator.

  Therefore, the arm of the sensor in the actuator rotates in one direction due to the thermal deformation of the cover, but rotates in the other direction due to the thermal deformation of the sensor, and the displacement of the arm is suppressed against the thermal deformation of the cover and the sensor. The detection accuracy can be improved, and the complexity of the structure can be suppressed by requiring almost no separate member.

  The motorcycle according to the present invention includes an engine and the continuously variable transmission that shifts a rotation output from a crankshaft of the engine.

  Therefore, the arm of the sensor in the actuator of the continuously variable transmission rotates in one direction due to the thermal deformation of the cover, but rotates in the other direction due to the thermal deformation of the sensor. The displacement can be suppressed, the detection accuracy can be improved, and the complexity of the structure can be suppressed without requiring another member.

  According to the linear actuator sensor, linear actuator, continuously variable transmission, and motorcycle of the present invention, the rotation direction output of the arm due to the thermal deformation of the cover and the rotation direction output of the arm due to the thermal deformation of the sensor are set in opposite directions. Therefore, the complexity of the structure can be suppressed and the detection accuracy can be improved.

FIG. 1 is a schematic configuration diagram showing a continuously variable transmission according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the internal structure of the actuator. FIG. 3 is a cross-sectional view for explaining the operation of the actuator. FIG. 4 is a plan view of the drive mechanism on the actuator housing side. FIG. 5 is a front view of the drive mechanism on the actuator housing side. FIG. 6 is a plan view of the actuator cover. FIG. 7 is a perspective view of the actuator sensor. FIG. 8 is a plan view of the actuator sensor. FIG. 9 is a front view of the actuator sensor. FIG. 10 is a side view of the actuator sensor. FIG. 11 is a plan view of the actuator cover on which the sensor is mounted. FIG. 12 is a front view of the actuator cover on which the sensor is mounted. FIG. 13 is a plan view showing an attachment state of the actuator cover to the actuator housing. FIG. 14 is a front view illustrating a state where the actuator cover is attached to the actuator housing. FIG. 15 is a plan view of an actuator housing to which a sensor is mounted. FIG. 16 is an exploded view of the actuator sensor. FIG. 17 is a front view illustrating the relationship between the brush and the resistor in the sensor. FIG. 18 is a plan view showing the relationship between the brush and the resistor in the sensor. FIG. 19 is a front view illustrating a thermal deformation state of the sensor. FIG. 20 is a plan view illustrating a thermal deformation state of the sensor. FIG. 21 is an explanatory diagram showing the operation of the sensor.

  Exemplary embodiments of a linear actuator sensor, a linear actuator, a continuously variable transmission, and a motorcycle according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 1 is a schematic configuration diagram showing a continuously variable transmission according to an embodiment of the present invention. In the present embodiment, the motorcycle has an engine and a continuously variable transmission that shifts the rotation output from the crankshaft of the engine. The vehicle driving force transmitted from the crankshaft 2 of the engine 1 to the driving pulley 3 in the continuously variable transmission is transmitted to the driven pulley 5 via the belt (V belt) 4 and can be transmitted from the final gear 6 to the driving wheel. is there. The drive pulley 3 and the driven pulley 5 are each composed of a combination of fixed sheaves 3a, 5a and movable sheaves 3b, 5b. Can be changed. The movable sheave 5b of the driven pulley 5 is provided with a spring 201 and a damper 202. When the contact radius of the belt 4 changes as the groove width of the drive pulley 3 changes, the movable sheave 5b moves as the belt 4 moves. The groove width is automatically changed by moving 5b in the pulley axial direction. A return spring 203 is attached to the movable sheave 3 b of the drive pulley 3. In addition, although sheave has the meaning of the pulley which ropes itself, in this embodiment, it means any one cone which forms the groove | channel of a pulley.

  In the drive pulley 3, one end of the swing member 8 is connected to the movable sheave 3b. The center of the swing member 8 is slidably connected to, for example, a transmission housing by a swing connection structure 9 such as a pin. Therefore, when the actuator 7 moves the other end of the swing member 8 in a linear direction parallel to the pulley shaft, the movable sheave 3b of the drive pulley 3 is moved in the pulley shaft direction, and the groove width of the drive pulley 3 is changed. Can do. The movable sheave 3b of the drive pulley 3 is connected to the return spring 203, the swing member 8, or the spring 201 and the damper 202 via the bearing 204 and the bearing holder 205, similarly to the movable sheave 5b of the driven pulley 5. ing. Specifically, the inner ring of the bearing 204 is fitted to the movable sheaves 3 b and 5 b, and the outer ring is fitted to the bearing holder 205. Therefore, the inner ring of the bearing 204 rotates together with the movable sheaves 3b and 5b, but the outer ring and the bearing holder 205 do not rotate.

  2 is a cross-sectional view showing the internal structure of the actuator, FIG. 3 is a cross-sectional view for explaining the operation of the actuator, and FIGS. 2 and 3 show an axial displacement element for driving the swing member 8 and The rotating element for moving this axial direction displacement element to an axial direction is shown.

  In the actuator 7, as shown in FIGS. 2 and 3, the rotating element and the axial displacement element are composed of a ball screw mechanism 10, the rotating element is composed of a ball screw nut 11, and the axial displacement element is composed of a ball screw shaft 12. . The ball screw nut 11 and the ball screw shaft 12 are accommodated in an aluminum actuator housing 13, and the actuator housing 13 is attached to the outside of a transmission housing (not shown). The actuator housing 13 is covered with a resin actuator cover 14 at the left opening end in FIGS. 2 and 3.

  The ball screw shaft 12 has a ball screw groove 12a formed on only one half of the axial direction (left side in FIGS. 2 and 3) and only half of the other side (right side in FIGS. 2 and 3). Is a round bar 12b without a groove. In the ball screw shaft 12, the round bar 12b is smaller than the outer diameter of the ball screw groove 12a. In this ball screw shaft 12, a round bar 12 b protrudes outward (rightward in FIGS. 2 and 3) from the actuator housing 13 via a seal member 15, and the round bar of the ball screw shaft 12 is sealed by the seal member 15. 12b is slidably sealed. The ball screw shaft 12 is accommodated in a circular hole of the actuator housing 13 in which the round bar 12b is slightly larger in diameter than the round bar 12b. On the other hand, the ball screw shaft 12 is accommodated in the accommodating portion 17 of the actuator housing 13 in which the ball screw groove 12a communicates with the circular hole. The protruding end 12c of the ball screw shaft 12 is connected to the other end of the swing member 8 via a link mechanism (not shown), thereby restricting the rotation of the ball screw shaft 12 itself. The ball screw nut 11 has three rows (three circuits) of ball grooves, and the ball circulates in a circulating portion 11a formed by cold forging on the inner peripheral surface of the ball screw nut 11.

  The ball screw nut 11 is rotatably attached to the actuator housing 13 via a bearing 16. As a result, the movement of the ball screw nut 11 in the axial direction is restricted. The ball screw nut 11 has a final gear 18 of a speed reduction mechanism, which will be described later, attached to the outer periphery via a key 21. Accordingly, when the final gear 18 rotates, the ball screw nut 11 as a rotating element rotates. However, since the movement of the ball screw nut 11 itself in the axial direction is restricted, the ball screw shaft 12 as the axial displacement element is in the axial direction. Move to. Here, FIG. 2 shows a state in which the ball screw nut 11 is on the leftmost side in the drawing and the amount of protrusion from the actuator housing 13 is the smallest. FIG. 3 shows a state in which the ball screw nut 11 is located on the rightmost side in the drawing and the amount of protrusion from the actuator housing 13 is the maximum.

  3, the ball screw groove 12a of the ball screw shaft 12 abuts on the end surface of the storage portion 17 of the actuator housing 13, and the ball screw shaft 12 is further to the right. Movement is restricted. On the other hand, when the ball screw shaft 12 is at the leftmost position in FIG. 2, the left end surface of the ball screw shaft 12 contacts the end surface of the storage portion 20 of the actuator cover 14, and the ball screw shaft 12 is further to the left of the ball screw shaft 12. Movement toward the direction is restricted. The sensor 19 is provided so as to be in direct contact with the left end surface of the ball screw shaft 12 that is an axial direction displacement element, and can detect the amount of displacement of the ball screw shaft 12 in the axial direction.

  4 is a plan view of the drive mechanism on the actuator housing side, and FIG. 5 is a front view of the drive mechanism on the actuator housing side. The electric motor 22 is provided separately from the actuator housing 13, and is fixed to the actuator housing 13 by a fixing tool 24 such as a hexagon socket head bolt, for example. The electric motor 22 has two electric motor power supply male terminals 23. The electric motor 22 has a drive pinion 25 press-fitted to a rotating shaft and is fixed. The intermediate gear 26 is fixed to the intermediate shaft 28 supported by the actuator housing 13 and meshes with the drive pinion 25. Similarly to the intermediate gear 26, the intermediate pinion 27 is coaxially fixed to the intermediate shaft 28 and meshes with the final gear 18. Accordingly, the rotational force of the electric motor 22 is transmitted from the drive pinion 25 in the order of the intermediate gear 26, the intermediate shaft 28, and the intermediate pinion 27, and finally transmitted to the final gear 18, and after rotating the ball screw nut 11, the ball screw shaft 12 Is displaced in the axial direction.

  FIG. 6 is a plan view of the actuator cover, showing a state in which various components are not attached. As shown in FIG. 6, the actuator cover 14 is provided with a plurality of positioning engagement claws 29 protruding in the direction perpendicular to the paper surface in FIG. The actuator cover 14 is positioned with respect to the actuator housing 13 by the positioning engaging claws 29 engaging with the edge 13 a (see FIG. 4) around the final gear 18 of the actuator housing 13. The actuator cover 14 is provided with an electric motor power supply female terminal 30 that fits with the electric motor power supply male terminal 23, and the electric motor power supply female terminal 30 is insert-molded into the resin-made actuator cover 14. A thin plate wiring from the electric motor power supply female terminal 30 to a coupler to be described later is also insert-molded in the resin actuator cover 14. Further, the actuator cover 14 has a breather 41 attached to a through hole of the actuator cover 14. The breather 41 is a cap body in which a porous film is stretched in the center, and the pressure inside the actuator cover 14 can be adjusted through the porous film. The actuator cover 14 is provided with a sensor storage portion 31 in which the sensor 19 is stored.

  7 is a perspective view of the actuator sensor, FIG. 8 is a plan view of the actuator sensor, FIG. 9 is a front view of the actuator sensor, and FIG. 10 is a side view of the actuator sensor. As shown in FIGS. 7 to 10, the sensor 19 can detect the amount of axial displacement of the ball screw shaft 12, which is an axial displacement element. This sensor 19 is composed of a rotary type potentiometer, and a sensor power supply terminal 32, a sensor ground (ground) terminal 33, and a sensor output terminal 34 are projected from the lower surface side. In the sensor 19 composed of this rotary potentiometer, an arm 35 is fixed to a rotating shaft, and a tip end portion of the arm 35 can directly contact an end portion of the ball screw shaft 12. Therefore, when the ball screw shaft 12 is displaced in the axial direction, as shown in FIGS. 2 and 3, the arm 35 of the sensor 19 is in contact with the illustrated left end surface of the ball screw shaft 12, that is, the shaft end surface, and rotates while sliding. To do. As a result, the output signal of the sensor 19 changes as the rotation axis of the sensor 19 including the rotary potentiometer rotates. This change in the output signal is detected by a control device (not shown), and the rotational state of the electric motor 22 is feedback-controlled. In the state in which the ball screw shaft 12 is at the leftmost position in the drawing, the left end surface of the ball screw shaft 12 is in contact with the end surface of the storage portion 20 of the actuator cover 14, but the arm 35 of the sensor 19 is connected to the actuator cover 14. It is set not to interfere.

  FIG. 11 is a plan view of the actuator cover on which the sensor is mounted, and FIG. 12 is a front view of the actuator cover on which the sensor is mounted. The sensor 19 is housed in the sensor housing portion 31 of the actuator cover 14, and is fixed to the actuator cover 14 with potting (resin pile) or an adhesive. In the actuator cover 14, a coupler 36 is integrally formed outside the sensor housing portion 31. Therefore, the inner connection end face of the coupler 36 faces the terminals 32, 33, and 34 of the sensor 19 housed and fixed in the sensor housing portion 31, and the terminals 32 to 34 of the sensor 19 are opposed to the inner connection end face of the coupler 36. Is simply connected and the terminals 32, 33, 34 are connected to the internal wiring of the coupler 36 to automatically connect them. The actuator cover 14 is provided with an intermediate terminal 42 inserted into the electric motor power supply female terminal 30, and a resin cap 43 is attached to the intermediate terminal 42. The electric motor power supply male terminal 23 on the actuator housing 13 side is connected to the electric motor power supply female terminal 30 on the actuator cover 14 side via the intermediate terminal 42.

  FIG. 13 is a plan view showing an attachment state of the actuator cover to the actuator housing, and FIG. 14 is a front view showing an attachment state of the actuator cover to the actuator housing. In this case, FIG. 13 shows a state where the actuator cover 14 to which the coupler 36 is attached is put on the actuator housing 13 and fixed with a fixing tool 37 such as a screw, and FIG. 14 is a view of FIG. 13 viewed from the coupler 36 side. It is. When the actuator cover 14 is covered and fixed on the actuator housing 13, the seal member 39 is inserted into the groove 38 (see FIGS. 2 and 6) formed on the outer peripheral portion of the mating surface of the actuator cover 14. The inside is made liquid-tight.

  The actuator cover 14 is provided with a thin plate wiring 40 that communicates with the electric motor power supply female terminal 30 that is insert-molded inside the actuator cover 14, and the thin plate wiring 40 extends to the inside of the coupler 36 that is integrally molded with the actuator cover 14. ing. Of the female terminals for external connection in two stages and three rows at the coupler 36, the female terminal at the upper right in the figure is for motor power (−) and the female terminal at the upper left in the figure is the motor power (+ The lower right female terminal in the figure is for sensor ground, the lower middle female terminal in the figure is for sensor output signals, and the lower left female terminal in the figure is for sensor power.

  FIG. 15 is a plan view of the actuator housing to which the sensor is mounted. As shown in FIG. 4, the actuator cover 13 is seen through the actuator cover 14 with the actuator cover 14 covered and fixed. It is. The ball screw shaft 12 is provided with a processing center hole, but the arm 35 of the sensor 19 avoids the center hole of the ball screw shaft 12 and abuts the axial end surface of the ball screw shaft 12, that is, the shaft end portion. Thus, as the ball screw shaft 12 moves in the axial direction, the arm 35 of the sensor 19 moves smoothly in sliding contact.

  In the continuously variable transmission and the actuator 7 of the present embodiment, when the rotational force of the electric motor 22 is input to the ball screw nut 11 that is a rotating element via the speed reduction mechanism, the axial direction depends on the amount of rotation of the ball screw nut 11. The ball screw shaft 12, which is a displacement element, is displaced in the axial direction, and the rocking member 8 is rocked in accordance with the amount of displacement to move the movable sheave 3b in the pulley shaft direction. A sensor 19 that detects the amount of displacement of the ball screw shaft 12 in the axial direction directly contacts the shaft end of the ball screw shaft 12 to detect the amount of displacement of the ball screw shaft 12 in the axial direction. It is fixed to an actuator cover 14 that covers the shaft end. This eliminates the need for extra parts for detecting the amount of displacement of the ball screw shaft 12 in the axial direction by the sensor 19, reduces the number of parts, and eliminates the need to form holes in the actuator housing 13, resulting in easy assembly. Thus, the cost can be reduced by that much and the reliability can be improved.

  The sensor 19 is composed of a potentiometer, and an arm 35 attached to the rotary shaft of the potentiometer is in contact with the end of the ball screw shaft 12. For this reason, it is possible to minimize the number of parts required for detecting the amount of displacement of the ball screw shaft 12 in the axial direction by the sensor 19, and to reduce the number of parts accordingly.

  The actuator 7 includes a coupler 36 in which the electric motor power source, the sensor power source, and the sensor output terminal are integrated with the actuator cover 14. Therefore, it is not necessary to separately provide a coupler for the electric motor and a coupler for the sensor, and the number of parts can be reduced accordingly. Further, since the rotation element and the axial displacement element are configured by a ball screw mechanism, the rotation amount of the rotation element can be smoothly converted into movement of the axial displacement element in the axial direction.

  In the actuator 7 of the present embodiment configured as described above, the actuator 7 is easily affected by heat because it is disposed in the vicinity of the engine 1 or the continuously variable transmission, and the actuator housing 13 and the actuator cover 14 are provided. If it is thermally deformed, the detection accuracy of the sensor 19 may be reduced. Particularly, in the actuator 7, the ball screw shaft 12 is supported on the actuator housing 13 and the sensor 19 is mounted on the actuator cover 14, so that the ball screw shaft 12 and the sensor 19 are likely to be displaced due to the thermal effect on the actuator 7. .

  Therefore, in this embodiment, the rotation direction of the arm 35 due to the thermal deformation of the actuator cover 14 and the rotation direction of the arm 35 due to the thermal deformation of the sensor 19 are set to be opposite to each other.

  16 is an exploded view of the actuator sensor, FIG. 17 is a front view showing the relationship between the brush and the resistor in the sensor, FIG. 18 is a plan view showing the relationship between the brush and the resistor in the sensor, and FIG. FIG. 20 is a plan view illustrating the thermal deformation state of the sensor, and FIG. 21 is an explanatory diagram illustrating the operation of the sensor.

  As shown in FIG. 16, the sensor 19 includes a rotor 101, an arm 35, a return coil spring 102 as an urging member, a resistor 103, an upper case 104, and a lower case 105. The rotor 101 is configured by fixing a disk member 111 to a rotating shaft 110. The rotating shaft 110 has an upper end passing through the upper case 104 and the arm 35 is fixed. The disk member 111 has a support plate 112 integrally formed on a lower surface thereof, and a positioning projection 114 is formed. The metal brush 113 as a detector has a plurality of brush portions formed on the base end portion, and the base end portion (for example, opening) is fitted to the protrusion 114, and the protrusion 114 is caulked. It is fixed with. The resistor 103 has a disk shape like the disk member 111, and the sensor power supply terminal 32, the sensor ground terminal 33, and the sensor output terminal 34 are fixed thereto. In addition, the printed circuit board 115 is fixed to the upper surface of the resistor 103 by positioning ribs, and the tips of a plurality of brush portions of the metal brush 113 of the rotor 101 are in contact with the resistor film fired on the printed circuit board 115. . In this case, the metal brush 113 has a plurality of contact portions because the tips of the plurality of brush portions are in contact with the resistor film fired on the printed circuit board 115, and the reliability is increased.

  One end of the return coil spring 102 is locked to the upper case 104, and the other end is locked to the disk member 111. Therefore, the arm 35 is urged and supported in the clockwise direction in FIG. 21 by the urging force of the return coil spring 102, so that the tip portion can come into contact with the end of the ball screw shaft 12. When the ball screw shaft 12 is displaced in the axial direction (rightward in FIG. 21), the arm 35 rotates counterclockwise in FIG.

  The lower case 105 is a container having an upper opening, and the upper case 104 is a container having a lower opening and a through hole formed in the upper part. In the resistor 103, the disk member 111 is housed and fixed in the lower case 105, and the sensor power supply terminal 32, the sensor ground terminal 33, and the sensor output terminal 34 protrude downward. The rotor 101 has a lower portion of the rotating shaft 110 fitted into the disk member 111 of the resistor 103, and is rotatable and relatively movable in the axial direction. And the upper case 104 is fixed so that the opening of the lower case 105 may be covered, the upper end part of the rotating shaft 110 protrudes from the through-hole, and the arm 35 is fixed.

  As shown in FIGS. 17 and 18, in the sensor 19, the disk member 111 of the rotor 101 and the resistor 103 are opposed to each other with a predetermined gap S1. The metal brush 113 is an elastic member, the base end portion is fixed to the lower surface of the disk member 111, and the tip end portion is pressed against the surface of the printed board (resistor film) 115 in the resistor 113. In this case, the tip of the metal brush 113 extends in the biasing direction of the arm 35 by the return coil spring 102 (clockwise direction in FIG. 18), and is in contact with the surface of the printed circuit board 115.

  Therefore, as shown in FIG. 21, in the sensor 19, when the ball screw shaft 12 is displaced in the right direction, the arm 35 pushed by the end portion rotates in the counterclockwise direction. Then, the rotor 101 integrated with the arm 35 rotates in the same direction, and the contact position between the tip of the metal brush 113 and the printed board 115 in the resistor 103 changes. The sensor output terminal 34 outputs the change in the contact position as a change in the output signal of the sensor 19.

  In the actuator 7, the ball screw shaft 12 is supported by the actuator housing 13, and the sensor 19 is mounted on the actuator cover 14. Therefore, when the actuator 7 receives heat, the actuator cover 14 is fixed to the actuator housing 13, so that the actuator cover 14 is thermally deformed with respect to the actuator housing 13 in the direction of arrow A <b> 1 in FIG. 21. Then, since the sensor 19 moves together with the actuator cover 14, the sensor 19 rotates in the direction of arrow A <b> 2 in FIG. 21 while the tip end is in contact with the end of the ball screw shaft 12. Therefore, the sensor 19 detects a change in output in the minus direction.

  However, when the sensor 19 receives heat, the rotor 101, the resistor 103, and the cases 104 and 105 are thermally deformed. That is, as shown in FIG. 19, since the rotor 101 is thermally deformed in the axial center direction of the rotating shaft 110, that is, in the direction of the arrow B1 in FIG. 19, the disk member 111 and the resistor 103 of the rotor 101 are separated from each other. The gap S2 is larger than the predetermined gap S1. When the gap S2 between the disk member 111 and the resistor 103 is increased, the metal brush 113 is supported by the disk member 111 of the rotor 101 at the base end portion and the printed substrate 115 of the resistor 103 is pressed and brought into contact with the tip end portion. However, the support angle increases. When the support angle of the metal brush 113 is increased, as shown in FIG. 20, the contact position of the metal brush 113 with respect to the printed circuit board 115 is shifted by the distance R in the direction of the arrow B2 in FIG. The displacement of the contact position of the metal brush 113 with respect to the printed circuit board 115 is a displacement of the contact voltage division ratio, which is the same as the rotation of the arm 35 in the direction of arrow B3 as shown in FIG. Detect output change in direction.

  Therefore, the actuator 7 receives heat, the actuator cover 14 is thermally deformed in the direction of arrow A1 in FIG. 21, and the arm 35 rotates in the direction of arrow A2 in FIG. On the other hand, the sensor 19 receives heat, the rotor 101 is thermally deformed in the direction of arrow B1 in FIG. 19, and the contact position of the metal brush 113 with respect to the printed circuit board 115 is shifted by the distance R in the direction of arrow B2 in FIG. Is the same as rotating in the direction of arrow B3 in FIG. Therefore, the rotation amount of the arm 35 due to the thermal deformation of the actuator cover 14 is offset by the shift amount of the contact position of the metal brush 113 with respect to the resistor 103.

  As described above, in the linear actuator sensor 19 according to the present embodiment, the resistor 103 fixed to the actuator cover 14, the arm 35 rotatably supported by the actuator cover 14, and the tip of the arm 35 are connected to a ball screw. A return coil spring 102 that is urged in a direction in contact with the end of the shaft 12 and a metal brush 113 that is supported on the arm 35 side and is slidable with respect to the resistor 103 are provided. The rotation direction output of the arm 35 and the rotation direction output of the arm 35 due to thermal deformation of the sensor 19 are set to be opposite to each other.

  Therefore, the arm 35 outputs one rotational direction output due to the thermal deformation of the actuator cover 14, but outputs the other rotational direction output due to the thermal deformation of the sensor 19, and against the thermal deformation of the actuator cover 14 and the sensor 19. Output displacement due to the arm 35 is suppressed, detection accuracy can be improved, and the complexity of the structure can be suppressed by requiring almost no separate member.

  In the linear actuator sensor 19 of the present embodiment, the base end portion of the metal brush 113 that is an elastic member is supported by the rotor 101 and the distal end portion is pressed against the resistor 103. Accordingly, when the sensor 19 is thermally deformed, the distance between the rotor 101 and the resistor 103 is increased, so that the support angle of the metal brush 113 is increased while the tip portion presses the resistor 103, and the contact with the resistor 103 is increased. The position will shift. Therefore, the rotation amount of the arm 35 due to the thermal deformation of the actuator cover 14 is offset by the shift amount of the contact position of the metal brush 113 with respect to the resistor 103.

  In the linear actuator sensor 19 of this embodiment, the tip of the metal brush 113 extends in the biasing direction of the arm 35 by the return coil spring 102. Therefore, the amount of rotation of the arm 35 due to the thermal deformation of the actuator cover 14 can be appropriately offset by the amount of displacement of the contact position of the metal brush 113 with respect to the resistor 103.

  In the linear actuator sensor 19 of the present embodiment, the disc member 111 is fixed to the rotating shaft 110 that is rotatable with respect to the actuator cover 14, and the arm 35 is fixed to the rotating shaft 110, while the disc member 111 has a metal brush. 113 is supported. Therefore, the metal brush 113 can be properly brought into contact with the resistor 103.

  In the linear actuator sensor 19 of the present embodiment, the resistor 103 and the rotation shaft 110 are relatively movable in the direction of the rotation axis. Therefore, when the sensor 19 is thermally deformed, the distance between the disk member 111 and the resistor 103 is appropriately displaced and becomes long. Therefore, the rotation amount of the arm 35 due to the heat deformation of the actuator cover 14 is set to the metal brush 113 with respect to the resistor 103. Can be canceled by the amount of displacement of the contact position.

  Further, even in the linear actuator, continuously variable transmission, and motorcycle according to the present embodiment, the detection accuracy can be improved by the action of the sensor 19, and a separate member is hardly required to suppress the complexity of the structure. be able to.

  In the above-described embodiment, the detector is the metal brush 113 serving as an elastic member. However, the present invention is not limited to this configuration, and may be a metal plate, for example.

  Further, in the above-described embodiment, the ball screw shaft 12 as the axial direction displacement element is also deformed by the influence of heat, so that the thermal deformation in the axial direction of the ball screw shaft 12 is also due to the thermal deformation of the actuator cover 14. This contributes to offsetting the rotation amount of the arm 35.

  In the above-described embodiment, the rotating element and the axial direction displacement element do not necessarily have to be a ball screw mechanism, and may be, for example, a normal bolt / nut combination. Further, the driving mode of the vehicle to which the motorcycle, continuously variable transmission, and actuator of the present invention are applied is not limited to the embodiment, and for example, a so-called hybrid vehicle using an engine and a motor together as a vehicle driving source. It may be.

1 Engine 2 Crankshaft 3 Drive pulley 3a Fixed sheave 3b Movable sheave 4 Belt (V-belt)
5 Driven pulley 5a Fixed sheave 5b Movable sheave 6 Final gear 7 Actuator 8 Oscillating member 9 Oscillating connecting structure 10 Ball screw mechanism 11 Ball screw nut 12 Ball screw shaft (axial displacement element)
DESCRIPTION OF SYMBOLS 13 Actuator housing 14 Actuator cover 18 Final gear 19 Sensor 22 Electric motor 31 Sensor accommodating part 35 Arm 101 Rotor 102 Return coil spring (biasing member)
103 Resistor 104 Upper Case 105 Lower Case 113 Metal Brush (Detector)
115 Printed circuit board

Claims (8)

A linear actuator sensor in which an axial displacement element is accommodated in a housing and covered with a cover to form a linear actuator, and is attached to the cover and can detect a displacement amount of the axial displacement element.
A resistor fixed to the cover;
An arm rotatably supported by the cover;
A biasing member that biases the tip of the arm in a direction in contact with the end of the axial displacement element;
A detector supported on the arm side and slidable with respect to the resistor;
Have
The rotational direction output of the arm due to thermal deformation of the cover and the rotational direction output of the arm due to thermal deformation of the sensor are set in opposite directions.
A linear actuator sensor characterized by the above.   2. The linear actuator sensor according to claim 1, wherein the detector is an elastic member, a proximal end portion is fixed to the arm side, and a distal end portion is pressed by the resistor.   The linear actuator sensor according to claim 2, wherein a tip of the detector extends in a biasing direction of the arm by the biasing member.   2. The disk member is fixed to a rotation shaft that is rotatable with respect to the cover, the arm is fixed to the rotation shaft, and the detector is supported by the disk member. The sensor for linear actuators as described in any one of Claim 3.   The linear actuator sensor according to claim 4, wherein the resistor and the rotation shaft are supported so as to be relatively movable in a direction of a rotation axis of the rotation shaft. A housing;
A cover covering the housing;
An electric motor housed in the housing;
A speed reduction mechanism that transmits the rotational force generated by the electric motor, a rotational element that inputs the rotational force of the electric motor via the speed reduction mechanism, and an axial direction displacement element that is displaced in the axial direction according to the amount of rotation of the rotational element A drive mechanism including:
The sensor according to any one of claims 1 to 5, wherein an amount of displacement of the axial direction displacement element in an axial direction is detected.
A linear actuator comprising: A fixed sheave fixed to the pulley shaft and rotating integrally;
A movable sheave supported so as to be movable in the axial direction along the pulley shaft;
A belt disposed between the fixed sheave and the movable sheave;
The linear actuator according to claim 6, wherein the movable sheave is moved in the axial direction to vary the pulley groove width,
A continuously variable transmission. An engine,
The continuously variable transmission according to claim 7, wherein a speed of rotation output from a crankshaft of the engine is changed.
A motorcycle characterized by comprising:

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