JP2010223252A - Position detecting device and belt type continuously variable transmission with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position detection sensor capable of processing detection data easily and improving position detection accuracy. <P>SOLUTION: The non-contact type position detection sensor 50 includes a detected surface 51 arranged on the rotary outer circumferential surface 18a of a movable pulley-half 18 for linearly moving in a rotating shaft direction, and a sensor body 52 consisting of a Hall element 53 arranged to face the detected surface 51 and a substantially U-shaped magnet 54 enclosing it, and is capable of detecting the position of the movable pulley half 18 as the output of the Hall element 53 changes as the distance between the sensor body 52 and the detected surface 51 changes in accordance with the movement of the movable pulley-half 18. The detected surface 51 of the movable pulley half 18 is formed in a curved inclined surface form which curves and inclines so that its inclination changes in the moving direction of the movable pulley-half 18. As output distribution of the Hall element 53 is of a linear distribution or an approximate linear distribution, data processing becomes easier and the position detection accuracy is improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a non-contact type position detection device suitable for use in detecting the position of a moving body, and a belt-type continuously variable transmission including the position detection device.

  Conventionally, as a non-contact type position detection sensor (position detection device) for detecting the position of a moving object, for example, there is a magnetic sensor using a Hall element or a magnetoresistive element. As an example of such a position detection sensor, there is a position detection sensor described in Patent Document 1. This position detection sensor is a sensor for detecting the position of the movable pulley half provided in the belt type continuously variable transmission (CVT) in the rotation axis direction. The position detection sensor includes an inclined detection surface provided on a rotating outer circumferential surface of a movable pulley half that linearly moves along the rotation axis direction, and a detection unit that is disposed to face the detection surface. Provided, and the distance from the detection unit to the detection surface associated with the movement of the movable pulley half in the direction of the rotation axis is measured. Based on the measured distance from the detection unit to the surface to be detected, the position of the movable pulley half in the direction of the rotation axis is known.

  Here, the belt-type continuously variable transmission has a configuration in which an endless belt is wound between a driving pulley provided on an input-side rotating shaft and a driven pulley provided on an output-side rotating shaft. By changing the groove width of each of the driving pulley and the driven pulley, the transmission gear ratio (gear ratio) between the two pulleys can be changed steplessly. Such a belt-type continuously variable transmission can be smoothly shifted according to the load state of the prime mover, and is therefore used as a power transmission device for various power machines including automobiles.

In a belt type continuously variable transmission, it is necessary to grasp a gear ratio (gear ratio) between both pulleys in order to perform shift control. Therefore, by mounting a position detection sensor as described in Patent Document 1, the position of the movable pulley half included in the drive pulley or the driven pulley in the direction of the rotation axis is detected. Based on the position of the movable pulley half in the rotation axis direction detected by the position detection sensor, the groove width of the driving pulley or the driven pulley is calculated, and the gear ratio is calculated.
JP-A-1-134201

  By the way, in the belt type continuously variable transmission as described above, in order to improve the accuracy of the shift control, it is important to accurately grasp the gear ratio. Therefore, even in the position detection device that can detect the position of the movable pulley half that linearly moves in the rotation axis direction described in Patent Document 1, the detection data processing is further facilitated, and the position detection accuracy is further improved thereby. Improvements are needed to achieve this.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a position detection device capable of facilitating detection data processing and improving position detection accuracy, and a belt-type continuously variable apparatus including the position detection device. It is to provide a transmission.

  The present invention for solving the above-described problems is arranged to face the detected surface (51) provided on the side surface (18a) with respect to the moving direction of the moving body (18) that moves linearly, and the detected surface (51). A detection unit (52) comprising a Hall element (53) and a magnet (54) arranged so as to surround both sides and the back side of the Hall element (53) with respect to the detection surface (51), As the distance from the detection unit (52) to the detected surface (51) changes as the moving body (18) moves, the output of the Hall element (53) changes, and the position of the moving body (18) is changed. A non-contact type position detecting device (50) capable of detection, wherein the detected surface (51) of the moving body (18) changes its inclination along the moving direction of the moving body (18). It is formed into a curved inclined surface shape that is inclined while being curved.The curved inclined surface shape of the detection surface (51) here is set to a shape in which the output distribution of the Hall element (53) with respect to the position of the moving body (18) is a linear distribution or a linear approximation distribution. It is desirable.

A detection unit having a Hall element and a magnet as a position detection device having a detection surface provided on a side surface with respect to a moving direction of a moving body that moves linearly and a detection unit arranged to face the detection surface In the case of using a position detection device provided with, for example, a position detection device having a linearly inclined surface shape in which the inclination of the moving body in the moving direction is constant, as in the position detection device described in Patent Document 1. In some cases, the output characteristics of the position detection device (the output distribution of the Hall element with respect to the position of the moving body) do not become a linear distribution or a linear approximation. Thus, if the output distribution of the Hall element is non-linear, handling of the detection data becomes complicated, which may hinder the easy processing of the detection data and the improvement of the position detection accuracy.
Therefore, in the position detection apparatus according to the present invention, the detection target surface of the moving body is formed in a curved inclined surface shape that is inclined while being bent so that the inclination changes along the moving direction of the moving body. The curved inclined surface shape is set to a shape such that the output distribution of the Hall element with respect to the position of the moving body is a linear distribution or a linear approximation. Thereby, it becomes easy to handle the detection data, and it becomes possible to facilitate the processing of the detection data and improve the position detection accuracy.

  Moreover, this invention for solving the said subject is a drive pulley (11) which consists of a pair of fixed pulley half (12) and movable pulley half (13) installed on the input rotating shaft (1). A driven pulley (16) comprising a pair of fixed pulley halves (17) and a movable pulley half (18) installed on the output rotating shaft (2), a drive pulley (11) and a driven pulley (16) An endless belt (15) stretched between and a groove width between a stationary pulley half (12) and a movable pulley half (13) included in the drive pulley (11), And a continuously variable belt type continuously variable gear ratio by changing the groove width between the stationary pulley half (17) and the movable pulley half (18) of the driven pulley (16). A movable pulley provided in the transmission (10) and the driven pulley (16) A non-contact-type position detection device (50) for detecting the position of any one of the half body (18) and the movable pulley half body (12) included in the drive pulley (11) in the rotation axis direction, and the position detection device (50) is a detection surface (51) having a curved inclined surface shape that is inclined while being curved so that the inclination changes along the rotation axis direction provided on the rotating outer peripheral surface (18a) of the movable pulley half (18). ), A Hall element (53) disposed to face the detected surface (51), and a magnet disposed so as to surround both sides and the back side of the Hall element (53) with respect to the detected surface (51). 54) and a detection unit (52). In this belt-type continuously variable transmission (10), the curved inclined surface shape of the detected surface (51) is such that the output distribution of the Hall element (53) with respect to the position of the movable pulley half (18) in the rotational axis direction. The shape may be set to a linear distribution or a linearly approximate distribution.

  In the belt type continuously variable transmission (10), the drive pulley rotation sensor (34) for detecting the rotation speed of the drive pulley (11) and the driven pulley rotation sensor for detecting the rotation speed of the driven pulley (16). (36) and pulley side pressure control means (61, 62) for controlling the side pressure of at least one of the drive pulley (11) and the driven pulley (16), and the pulley side pressure control means (61, 62) The gear ratio calculated from the ratio between the rotational speed detected by the drive pulley rotational sensor (34) and the rotational speed detected by the driven pulley rotational sensor (36), and the movable pulley half (18) detected by the position detector (50). ) Is compared with the gear ratio calculated from the position of the drive pulley (11) and the driven pulley (16).

A belt-type continuously variable transmission according to the present invention includes a detection surface provided on a rotating outer peripheral surface of a movable pulley half, and a detection unit arranged to face the detection surface. Such a position detection device is provided. That is, a curved inclined surface shape in which the detected surface provided on the rotating outer peripheral surface of the movable pulley half is inclined while being curved so that the inclination changes with respect to the rotation axis direction that is the moving direction of the movable pulley half. did. Thus, by making the surface to be detected curved, it is possible to make the output distribution of the position detection device a linear distribution or a linear approximation. Therefore, it is possible to facilitate the processing of the detection data by the position detection device and improve the position detection accuracy. As a result, the gear ratio (transmission ratio) between the driving pulley and the driven pulley can be accurately grasped, so that the accuracy of the shift control of the belt type continuously variable transmission can be improved.
In addition, the code | symbol in said parenthesis shows the code | symbol of the component in embodiment mentioned later as an example of this invention.

  According to the position detection device of the present invention, it becomes possible to facilitate the processing of detection data and improve the position detection accuracy. According to the belt type continuously variable transmission equipped with this position detection device, accurate shifting Since the ratio can be grasped, the accuracy of the shift control can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a power transmission device for a vehicle including a position detection sensor (position detection device) according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of a portion A in FIG. A power transmission device M shown in FIG. 1 includes a belt-type continuously variable transmission (CVT) 10 that transmits power from an output shaft Es of a drive source such as an engine and a motor (both not shown). Configured.

  The belt-type continuously variable transmission 10 includes a metal V-belt mechanism 20 disposed between the input shaft 1 and the counter shaft 2 and a forward / reverse switching mechanism 40 disposed on the input shaft 1. Has been. The input shaft 1 is connected to an output shaft Es of a drive source (not shown) such as an engine via a torque converter TC. On the other hand, the driving force from the counter shaft 2 is transmitted to the left and right wheels (not shown) via the differential mechanism 8 and the left and right axle shafts 8a and 8b. In the description of this embodiment, the direction of the rotation axis indicates the axial direction of the input shaft 1 or the counter shaft 2.

  The metal V-belt mechanism 20 includes a drive pulley (drive pulley) 11 disposed on the input shaft 1, a driven pulley (driven pulley) 16 disposed on the counter shaft 2, and the drive pulley 11 and the driven pulley 16. And an endless metal V-belt 15 wound around. The drive pulley 11 is fixedly movable on the input shaft 1 so as to be rotatable and fixedly movable in a linearly movable manner in the direction of the rotation axis at a position facing the fixed pulley half 12. The pulley half 13 is provided. A cylinder chamber 14 surrounded by a cylinder wall 14a is formed on the back side of the movable pulley half 13 (on the side opposite to the fixed pulley half 12). The cylinder chamber 14 is supplied with hydraulic pressure adjusted by a hydraulic control valve 61 (see FIG. 4) described later. A drive side pressure (drive pulley side pressure) that moves the movable pulley half 13 in the direction of the rotation axis is generated by the control hydraulic pressure supplied to the cylinder chamber 14.

  On the other hand, the driven pulley 16 includes a fixed pulley half 17 fixed to the counter shaft 2 and a movable pulley half disposed so as to be linearly movable and rotatable in the rotation axis direction at a position facing the fixed pulley half 17. (Moving body) 18. A cylinder chamber 19 surrounded by a cylinder wall 19 a is formed on the back side of the movable pulley half 18 (on the side opposite to the fixed pulley half 17). The cylinder chamber 19 is regulated by a hydraulic control valve 61. The hydraulic pressure is supplied. Due to the control oil pressure supplied to the cylinder chamber 19, a driven side pressure (driven pulley side pressure) that moves the movable pulley half 18 in the direction of the rotation axis is generated.

  In the metal V-belt mechanism 20 configured as described above, the hydraulic control valve 61 controls the hydraulic pressure supplied to the cylinder chamber 14 and the cylinder chamber 19 (the driving side pressure and the driven side pressure), so that the driving pulley 11 and the driven pulley 16 are controlled. The metal V-belt 15 applies a lateral pressure that does not cause slippage. Further, the driving side pressure and the driven side pressure are controlled to be different from each other, and the groove widths of the driving pulley 11 and the driven pulley 16 are appropriately changed to change the winding diameter of the metal V-belt 15, thereby driving. Control is performed to change the speed ratio between the pulley 11 and the driven pulley 16 steplessly.

  The forward / reverse switching mechanism 40 includes a forward clutch 25, a reverse brake 27, and a planetary gear mechanism 29. When the forward clutch 25 is engaged, the drive pulley 11 is connected to the input shaft 1 by driving of an engine or a motor. It is rotationally driven in the same direction (forward direction). On the other hand, when the reverse brake 27 is engaged, the drive pulley 11 is rotationally driven in the reverse direction (reverse direction) to the input shaft 1 by driving of the engine or the motor.

  The drive pulley 11 and the driven pulley 16 of the metal V-belt mechanism 20 are respectively provided with a drive pulley rotation sensor 34 and a driven pulley rotation sensor 36 for detecting the rotation speed. The drive pulley rotation sensor 34 is disposed opposite to the outer peripheral end surface of the drive pulley 11 (fixed pulley half 12), and the driven pulley rotation sensor 36 is provided on the outer peripheral end surface of the driven pulley 16 (fixed pulley half 17). Opposed to each other. The driven pulley rotation sensor 36 is not on the cross section shown in FIG. 1 and is disposed at a position shifted from the cross section toward the back side or the near side. Therefore, in FIG. 1, the driven pulley rotation sensor 36 is illustrated by a virtual line.

  The drive pulley rotation sensor 34 and the driven pulley rotation sensor 36 are both non-contact type sensors (for example, non-contact type magnetic sensors) and have a common configuration. A specific example of rotation speed detection by the drive pulley rotation sensor 34 and the driven pulley rotation sensor 36 will be described. When the drive pulley 11 and the driven pulley 16 are rotated, they are provided on the outer peripheral end surfaces of the drive pulley 11 and the driven pulley 16 at predetermined angular intervals. The passage of a plurality of projections (not shown) is sequentially detected, and the detection result is sequentially output to the ECU 62 (see FIG. 4) described later as a pulse signal (detection signal). The ECU 62 calculates the instantaneous rotational speeds of the drive pulley 11 and the driven pulley 16 based on the time interval between the two pulse signals that are sequentially input. Further, based on the time corresponding to one rotation of the drive pulley 11 and the driven pulley 16, the average rotation speed of the drive pulley 11 and the driven pulley 16 is calculated. Based on the calculated time interval and the time corresponding to one rotation, the rotation angles of the drive pulley 11 and the driven pulley 16 are calculated.

  The driven pulley 16 is provided with a position detection sensor (stroke sensor: position detection device) 50 for detecting the position of the movable pulley half 18 that reciprocally moves linearly along the rotation axis direction. As shown in FIG. 2, the position detection sensor 50 includes a detected surface 51 made of a conductor provided on a rotating outer peripheral surface (side surface with respect to the moving direction of the movable pulley half 18) 18 a of the movable pulley half 18, and a detected surface. A sensor main body (detection unit) 52 disposed opposite to the rotation outer peripheral side of 51 is configured. FIG. 3 is an enlarged view of a main part showing a detected surface 51 and a sensor main body 52 constituting the position detection sensor 50 of the present embodiment. The sensor main body 52 includes a Hall element 53 disposed to face the detected surface 51, and a substantially U-shaped magnet disposed so as to surround three sides of the Hall element 53 on both sides and the back side of the detected surface 51. (Permanent magnet) 54. The detection surface 51 is formed in a curved inclined surface shape that is inclined while being curved so that the inclination changes along the moving direction of the movable pulley half 18.

  FIG. 4 is a block diagram showing a partial configuration of a control device 60 for controlling the pulley side pressures of the drive pulley 11 and the driven pulley 16. The control device 60 includes a hydraulic control valve (HV) 61 for regulating and supplying control hydraulic pressure supplied to the cylinder chamber 14 of the driving pulley 11 and the cylinder chamber 19 of the driven pulley 16, and a hydraulic control valve 61. And a control unit (ECU) 62 for controlling the operation. In order to control the operation of the hydraulic control valve 61, the ECU 62 includes the rotation speed data of the drive pulley 11 detected by the drive pulley rotation sensor 34, the rotation speed data of the driven pulley 16 detected by the driven pulley rotation sensor 36, Position data of the movable pulley half 18 detected by the position detection sensor 50 is input. Although not shown, the ECU 62 is also supplied with engine rotational speed data, rotational speed data of the input shaft 1 and counter shaft 2, detection signals relating to shift positions, and the like. The hydraulic pressure control valve 61 and the ECU 62 constitute pulley side pressure control means for controlling the side pressure of the driving pulley 11 and the driven pulley 16.

  Here, the position detection principle by the position detection sensor 50 and the calculation procedure of the gear ratio will be described. The Hall element 53 is an element that measures the strength of a magnetic field using the Hall effect. In the position detection sensor 50 including the hall element 53, the magnetic field generated by the magnet 54 can be converted into an electric signal and output. In the position detection sensor 50, the detected surface 51 provided on the rotating outer circumferential surface 18 a of the movable pulley half 18 is inclined with respect to the moving direction of the movable pulley half 18 (hereinafter referred to as “rotational axis direction”). It has an inclined surface shape. Thereby, when the movable pulley half 18 moves in the direction of the rotation axis, the interval (clearance) D between the sensor main body 52 and the detected surface 51 changes. Then, the magnetic field emitted from the magnets 54 on both sides of the Hall element 53 changes, and the output of the Hall element 53 changes. Thereby, the position of the movable pulley half 18 in the rotation axis direction can be detected.

  Then, by detecting the position of the movable pulley half 18 in the rotation axis direction, the effective diameter of the driven pulley 16 (the wound diameter of the metal V-belt 15, the same applies hereinafter) can be calculated. Furthermore, the effective diameter of the drive pulley 11 can be calculated based on the calculated effective diameter of the driven pulley 16 and the known total length of the metal V-belt 15. Therefore, the gear ratio (transmission ratio) at that time can be calculated from the ratio between the effective diameter of the drive pulley 11 and the effective diameter of the driven pulley 16.

  FIG. 5A is a graph showing the cross-sectional shape (vertical axis) of the detected surface 51 with respect to the position (horizontal axis) of the movable pulley half 18 in the rotational axis direction, and FIG. It is a graph which shows the output (output voltage) (vertical axis) of the position detection sensor 50 with respect to the position (horizontal axis) of the rotation axis direction of the body 18. FIG. 6 is a diagram illustrating a position detection sensor 150 having a conventional configuration having a detection surface 151 having a linearly inclined surface shape. FIG. 6 is a diagram provided for comparison with the present invention, and does not show the configuration of the present invention. In the graphs shown in FIGS. 5 (a) and 5 (b), the data relating to the detected surface 51 having the curved inclined surface shape (the detected surface 51 according to the present invention shown in FIG. 3) is shown by a solid line, and the detected data having the linear inclined surface shape. Data relating to the detection surface 151 (the detected surface 151 having the conventional configuration shown in FIG. 6) is also shown with a dotted line.

  When detecting the position of the movable pulley half 18 with the position detection sensor 50 including the sensor main body 52 including the hall element 53 and the magnet 54, the detected surface 51 rotates as in the conventional configuration shown in FIG. When the linear inclined surface has a linear inclination with a constant inclination along the axial direction, the output (output voltage) characteristics of the position detection sensor 50 as shown by the dotted line data shown in FIG. (It refers to the distribution of the output with respect to the position of the movable pulley half 18, the same applies hereinafter.) Becomes a curved distribution, and does not become a linear distribution or a distribution approximate to a linear distribution. With such a nonlinear output distribution, there is a problem that the processing of the output data becomes complicated and the accuracy of the obtained detection result is not so high.

  Therefore, in the position detection sensor 50 of the present embodiment, as shown in FIG. 3, a curved inclined surface shape in which the detected surface 51 is inclined while being curved so that the inclination changes along the moving direction of the movable pulley half 18. It is said. The curved inclined surface shape of the detected surface 51 here is set to such a shape that the output distribution of the position detection sensor 50 becomes a linear distribution or a linear approximation distribution, as shown in the graph of FIG. ing. As a result, the output distribution of the position detection sensor 50 becomes a linear distribution or a distribution approximated linearly, so that the processing of the output data can be facilitated, and the detection accuracy of the position detection sensor 50 can be increased.

  As described above, according to the position detection sensor 50 of the present embodiment, the curved inclined surface shape in which the detected surface 51 of the movable pulley half 18 is inclined while being curved so that the inclination changes along the rotation axis direction. The output distribution of the Hall element 53 with respect to the position of the movable pulley half 18 is made to be a linear distribution or a linearly approximated distribution. This facilitates the handling of the detection data by the position detection sensor 50, so that the detection data can be easily processed and the position detection accuracy can be improved.

  Although it has been widely performed to detect the position of a moving object using the Hall element 53, conventionally, an SN pole magnet is generally attached to the moving object side. However, it is technically difficult to attach a magnet to one that has a large outer diameter and rotates at a high speed, such as the driven pulley 16 or the drive pulley 11 of the belt-type continuously variable transmission 10, and this may lead to high product costs. Absent. Therefore, in the position detection sensor 50 of the present embodiment, a Hall element 53 and a substantially U-shaped magnet 54 surrounding the Hall element 53 are installed on the sensor body (detection unit) 52 side, and a magnetic field is generated on the sensor body 52 side. It was made to generate. Then, the detected surface 51 provided on the rotating outer circumferential surface 18a of the movable pulley half 18 is formed into an inclined surface shape that is inclined along the rotation axis direction, and from the sensor main body 52 as the movable pulley half 18 moves. The distance to the detected surface 51 is changed. This makes it possible to accurately measure the amount of movement of the movable pulley half 18 in a non-contact manner, even though the position detection sensor has a simple configuration that can be easily applied to the driven pulley 16 (or the drive pulley 11) of the belt-type continuously variable transmission 10. As a result, the gear ratio of the belt type continuously variable transmission 10 can be accurately grasped.

  Further, the gear ratio of the belt type continuously variable transmission 10 has conventionally been calculated based on the ratio between the rotational speed detected by the drive pulley rotational sensor 34 and the rotational speed detected by the driven pulley rotational sensor 36. However, in the method of obtaining the gear ratio from the ratio of the rotational speeds detected by the rotation sensors 34 and 35, a slip is generated in the metal V belt 15 wound between the drive pulley 11 and the driven pulley 16 by any chance. In this case, the ECU 62 erroneously determines that the gear ratio has shifted to the gear ratio closer to the LOW gear. For this reason, it becomes impossible to grasp an accurate gear ratio. In this respect, in the belt type continuously variable transmission 10 of the present embodiment, the movable pulley detected by the position detection sensor 50 is provided by providing the position detection sensor 50 that detects the position of the movable pulley half 18 in the rotation axis direction. The gear ratio can be calculated based on the position of the half body 18 in the rotation axis direction. Therefore, even if a slip occurs in the metal V-belt 15, it is possible to accurately grasp the gear ratio without being influenced by the slip.

  Further, in the belt type continuously variable transmission 10 of the present embodiment, since both the conventional drive pulley rotation sensor 34 and the driven pulley rotation sensor 36 and the position detection sensor 50 according to the present invention are provided, In the ECU 62, the gear ratio calculated from the ratio of the rotational speeds detected by the rotation sensors 34 and 36 is compared with the gear ratio calculated from the position of the movable pulley half 18 detected by the position detection sensor 50. It is possible to determine whether or not slip has occurred in the metal V belt 15 wound around the driven pulley 16 (so-called belt slip determination). That is, it is possible to determine whether the side pressure applied to the drive pulley 11 and the driven pulley 16 is an optimum load or whether the metal V-belt 15 is slipped due to an excessive load. Further, the ECU 62 compares the gear ratio calculated from the ratio of the rotational speeds detected by the rotation sensors 34 and 36 with the gear ratio calculated from the position of the movable pulley half 18 detected by the position detection sensor 50, thereby controlling the hydraulic pressure. By controlling the operation of the valve 61, it is possible to control at least one of the side pressure of the drive pulley 11 (drive side pressure) and the side pressure of the driven pulley 16 (driven side pressure).

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above embodiment, the case where the position detection sensor 50 according to the present invention is used as a sensor for detecting the position of the driven pulley 16 (the movable pulley half 18 provided in the driven pulley 16) has been described. 11 (movable pulley half 13 provided in the drive pulley 11) may be used as a sensor for detecting the position. Furthermore, the detection target of the position detection device according to the present invention is not limited to the movable pulley half 18 (13) of the belt-type continuously variable transmission 10, but includes another moving body that moves linearly or the same. It is also possible to apply to other devices.

It is a sectional side view showing a power transmission device provided with a position detection sensor concerning one embodiment of the present invention. It is a figure which shows a position detection sensor, and is the elements on larger scale of the A section of FIG. It is a principal part enlarged view which shows the to-be-detected surface and sensor main body which comprise a position detection sensor. It is a block diagram which shows a partial structure of the control apparatus for controlling the side pressure of a drive pulley and a driven pulley. (A) is a graph which shows the shape (vertical axis) of the to-be-detected surface with respect to the position (horizontal axis) of a movable pulley half body, (b) is a position detection sensor with respect to the position (horizontal axis) of a movable pulley half body. Is a graph showing the output (vertical axis). It is a principal part enlarged view which shows the position detection sensor at the time of making a to-be-detected surface into a linear inclined surface shape (conventional structure).

1 Input shaft 2 Counter shaft 10 Belt type continuously variable transmission (CVT)
11 Drive pulley 15 Metal V belt 16 Driven pulley 17 Fixed pulley half 18 Movable pulley half (moving body)
18a Rotating outer peripheral surface 20 Metal V belt mechanism 34 Drive pulley rotation sensor 36 Followed pulley rotation sensor 50 Position detection sensor (position detection device)
51 Detected surface 52 Sensor body (detection unit)
53 Hall element 54 Magnet 61 Hydraulic control valve (pulley side pressure control means)
62 ECU (pulley side pressure control means)
M Power transmission device

Claims (5)

A driving pulley comprising a pair of fixed pulley halves and a movable pulley half installed on the input rotating shaft, and a driven pulley comprising a pair of fixed pulley halves and a movable pulley half installed on the output rotating shaft And an endless belt stretched between the drive pulley and the driven pulley, and a groove width between the fixed pulley half and the movable pulley half included in the drive pulley, And a belt-type continuously variable transmission capable of changing the transmission ratio steplessly by changing the groove width between the stationary pulley half and the movable pulley half included in the driven pulley,
A non-contact type position detection device that detects the position of the movable pulley half included in the driven pulley and the position of the movable pulley half included in the drive pulley in the rotational axis direction;
The position detection device includes:
A detected surface having a curved inclined surface that is curved and inclined so as to change the inclination along the rotation axis direction provided on the rotating outer peripheral surface of the movable pulley half;
And a detection unit including a Hall element disposed to face the detected surface, and a magnet disposed so as to surround both sides and a back side of the Hall element with respect to the detected surface. Belt type continuously variable transmission. The curved inclined surface shape of the detected surface is set such that the output distribution of the Hall element with respect to the position of the movable pulley half in the direction of the rotation axis is a linear distribution or a linear approximation. The belt-type continuously variable transmission according to claim 1. A drive pulley rotation sensor for detecting the rotation speed of the drive pulley, a driven pulley rotation sensor for detecting the rotation speed of the driven pulley, and a pulley side pressure control means for controlling a side pressure of at least one of the drive pulley and the driven pulley. And further comprising
The pulley side pressure control means includes
A gear ratio calculated from the ratio of the rotation speed detected by the drive pulley rotation sensor and the rotation speed detected by the driven pulley rotation sensor, and a gear ratio calculated from the position of the movable pulley half detected by the position detection device. The belt type continuously variable transmission according to claim 1 or 2, wherein a side pressure of at least one of the drive pulley and the driven pulley is controlled by comparison. A detected surface provided on a side surface with respect to the moving direction of the moving body moving linearly;
A detection unit including a Hall element disposed to face the detection surface, and a magnet disposed so as to surround both sides and a back side of the Hall element with respect to the detection surface,
A non-contact position that can detect the position of the moving body by changing the output of the Hall element by changing the distance from the detection unit to the detected surface as the moving body moves. A detection device,
The position detection device, wherein the detected surface of the moving body is formed in a curved inclined surface shape that is inclined while being curved so that the inclination changes along the moving direction of the moving body. The curved inclined surface shape of the detected surface is set such that an output distribution of the Hall element with respect to the position of the moving body is a linear distribution or a linearly approximated distribution. 5. The position detection device according to 4.

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