JP2013213533A - Device and method for adjusting pulley thrust in v-belt continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable proper adjustment of a thrust required for a pulley, by enabling accurate detection of a boundary between an active arc area and an idle arc area even in a state of splashing oils, in a pulley thrust adjusting technology of a V-belt type continuously variable transmission.SOLUTION: A pulley thrust adjusting device of a v-belt type continuously variable transmission includes a primary pulley 2, a secondary pulley 3 and a V belt 4 extended to both pulleys 2 and 3. The V belt 4 is constituted of a large number of elements 5 arranged in series and a holding belt 6 for holding the elements 5. The pulley thrust adjusting device includes means 10 arranged in an outer peripheral part of the pulley 2 and detecting a splatter state of the oil from a clearance between the elements 5, a means 21 for estimating a boundary position between an active arc area and an idle arc area from the detected oil splatter state, and a means 22 for adjusting pulley thrust of an object pulley out of the primary pulley 2 and the secondary pulley 3 based on the estimated boundary position.

Description

  The present invention relates to a pulley thrust adjusting device and a pulley thrust adjusting method for a V-belt type continuously variable transmission suitable for use in an automobile.

  In a V-belt type continuously variable transmission (hereinafter, also simply referred to as CVT), torque input to a primary pulley (drive pulley, input-side variable pulley) is caused by the pulley surface of the primary pulley pressing the V-belt and the V-belt. Is transmitted from the primary pulley to the V-belt due to friction with the belt, and further transmitted from the V-belt to the secondary pulley due to friction between the V-belt and the pulley surface of the secondary pulley (driven pulley, output side variable pulley) that presses the V-belt. And output.

  The so-called push-type V-belt CVT, in which a large number of elements are held between two left and right steel belts, is generally used as the V-belt-type CVT. In this push type, when torque is transmitted from the primary pulley to the V-belt, it is transmitted from the pulley surface of the primary pulley to the elements of the V-belt, and the adjacent elements are pressed against each other to contact the secondary pulley. It is transmitted to the element.

  By the way, the thrust of each pulley that presses the V-belt needs to be large enough to prevent slippage between the V-belt and the pulley when torque is transmitted between the V-belt and each pulley. Therefore, in general, the minimum thrust that prevents the V-belt from slipping according to the input torque is set by multiplying the safety factor, and the thrust of the pulley is calculated by adding the differential thrust necessary to obtain the gear ratio. doing. However, since it is difficult to appropriately give the safety factor used in this case, an alternative method has been developed.

  For example, as shown in FIG. 8, in the push type V belt type CVT 1 ′, the V belt 4 ′ is transferred from the primary pulley (drive pulley, input side variable pulley) 2 to the secondary pulley (driven pulley, output side variable pulley) 3. In the proceeding region, a compressive force is generated between the elements 5 ′, and no gap is generated between the elements 5 ′ in this region. However, in the region where the V-belt 4 ′ returns from the secondary pulley 3 to the primary pulley 2, a compression force is not generated between the elements 5 ′, so that a gap is generated between the elements 5 ′.

  The region where the V-belt 4 ′ is sandwiched between the primary pulleys 2 is also classified into an active arc region where the elements 5 ′ are arranged without a gap and an idle arc region where the elements 5 ′ are arranged with a gap. The distribution of the active arc region and the idle arc region changes according to the magnitude of the pulley thrust. When the gear ratio is larger than 1, the active arc region becomes smaller when the pulley thrust is large. The proportion of increases. On the other hand, when the pulley thrust is small, the ratio of the active arc region increases and the ratio of the idle arc region decreases.

  Patent Documents 1 and 2 propose a pulley thrust adjustment method using the characteristics of such a push-type V-belt CVT. This method detects a boundary between an active arc region and an idle arc region in a primary pulley or a secondary pulley, and based on the detected boundary position, a thrust required for the pulley that holds the V-belt (hereinafter referred to as a pulley thrust). (Also called).

  In the technique of Patent Document 1, the boundary between the active arc region and the idle arc region is detected from the presence or absence of a gap between elements. That is, the gap between the elements is detected by two sensors arranged side by side in the circumferential direction of the pulley, the detection result of the sensor on the downstream side in the V-belt movement direction is no gap, and the detection result of the upstream sensor is a gap It is determined that there is a boundary between the two sensors.

On the other hand, in the technique of Patent Document 2, the boundary between the active arc region and the idle arc region is detected from the yawing angle of the element sandwiched between the pulleys.
That is, when torque is input from the pulley to the V-belt, no load is applied to the elements in the idle arc region, and there is a gap between the elements, so the yawing angle of the elements is constant. On the other hand, in the active arc region, a load acts between the elements and there is no gap between the elements, so that the yawing angle of the element is reduced. Therefore, the yaw angle θ of the element sandwiched between the pulleys is detected by the first gap sensor and the second gap sensor, and the boundary is detected from the detection result.

JP 2007-239937 A JP 2010-196746 A

  As described above, if the pulley thrust that the pulley pinches the V-belt is adjusted based on the position of the boundary between the active arc region and the idle arc region, the pulley thrust can be made not to be excessive or insufficient. Problems remain in the method of detecting the boundary between the region and the idle arc region.

  That is, the technique of Patent Document 1 detects the gap between elements, and the technique of Patent Document 2 detects the yawing angle of the element. Since the interval between elements and the yawing angle of the elements are very small, the boundary position is not limited to the gap sensor exemplified in Patent Document 2, and the sensor is contactless so as not to interfere with the element. Moreover, it is necessary to be able to detect with high accuracy.

  However, in the V belt type CVT, it is necessary to supply the lubricating oil to the sliding contact portion between the pulley and the V belt, and the lubricating oil is also supplied between the pulley and the V belt. This lubricating oil is usually supplied between the pulley and the V-belt by using ATF (Automatic Transmission Fluid) along the surface of the V-groove of the pulley from the shaft portion of the pulley.

  Therefore, ATF is scattered near the elements constituting the V-belt, and the scattered ATF hinders detection of the sensor, and the gap between the elements and the yawing angle of the element cannot be detected with high accuracy. . For this reason, it is difficult to detect the boundary between the active arc region and the idle arc region, and it is also difficult to appropriately adjust the pulley thrust based on the boundary position.

  The present invention was devised in view of such a problem, and can detect the position of the boundary between the active arc region and the idle arc region even under conditions where oils are scattered, and appropriately adjust the thrust of the pulley. It is an object of the present invention to provide a pulley thrust adjusting device and a pulley thrust adjusting method for a V-belt type continuously variable transmission that can be used.

  In order to achieve the above object, a pulley thrust adjusting device for a V-belt continuously variable transmission according to the present invention comprises a primary pulley, a secondary pulley, and a V-belt stretched over both pulleys. The belt adjusts the pulley thrust of the target pulley of the primary pulley and the secondary pulley in a V-belt continuously variable transmission including a plurality of elements arranged in series and a holding belt that holds the element. A pulley thrust adjusting device for a belt-type continuously variable transmission, which is disposed on an outer peripheral portion of the target pulley and is spaced from a gap between the elements of the V belt held in a V groove of the target pulley. A detecting means for detecting the scattered state of the oil, and the gap between the elements is arranged in a small state from the oil scattered state detected by the detecting means. Boundary position estimation means for estimating a boundary position between an active arc area and an idle arc area arranged in a state where a gap between the elements is larger than a gap between the active arc areas; and the boundary position estimation means And a thrust adjusting means for adjusting the pulley thrust based on the boundary position.

  The detection means is disposed in a space in which the opening width of the V-groove extends from the rotation center of the target pulley toward the outer side in the radial direction of the target pulley and the V belt does not reach. It is preferable.

  A plurality of the detection means are provided along the rotation direction of the rotating V-belt, and the boundary position estimation means estimates the boundary position from the oil scattering state respectively detected by the plurality of detection means. preferable.

  When the element is provided as a part of the V-belt, the head is disposed at the outer periphery of the V-belt, the body positioned at the inner periphery, and the center in the element width direction. A connecting part that connects the body part and the body part, and slots formed between the head part and the body part on one side and the other side of the connecting part. Preferably, the detection means is disposed on the outer periphery of the position of the connecting portion of the element where the holding belt is not present in the central portion in the element width direction. .

  In this case, a groove is formed on one surface of the head portion in the element width direction and a protrusion is formed on the other surface so that the protrusion can enter. The protrusion has a center in the element width direction. It is preferable that the detector is provided on both sides of the central portion except for the portion, and the detecting means is disposed on the outer periphery of the central portion in the element width direction where the protruding portion does not exist.

  In addition, the pulley thrust adjusting method of the V-belt type transmission according to the present invention includes a primary pulley, a secondary pulley, and a V-belt stretched over both pulleys, and the V-belt is arranged in series. Pulley thrust of a V-belt continuously variable transmission that adjusts the pulley thrust of a target pulley of the primary pulley and the secondary pulley in a V-belt continuously variable transmission that includes an element of the above and a holding belt that holds the element A detection method for detecting an oil scattering state from a gap between the elements of the V-belt, which is disposed on an outer peripheral portion of the target pulley and is sandwiched by the target pulley, and the detection From the oil scattering state detected by the step, the active arc region arranged in a state where the gap between the elements is small, Based on the boundary position estimated by the boundary position estimation step, the boundary position estimation step for estimating the boundary position with the idle arc region arranged in a state where the gap of the element is larger than the active arc region, And a thrust adjustment step for adjusting the pulley thrust.

  According to the pulley thrust adjusting device and the pulley thrust adjusting method of the V-belt type continuously variable transmission of the present invention, the active arc region where the elements are arranged without a gap is compared with the idle arc region where the elements are arranged with a gap. Since the amount of oil scattered from the gap between the elements to the outside in the pulley radial direction is large, the boundary position between the active arc region and the idle arc region is detected by detecting the state of the oil splashing outward in the pulley radial direction. Is estimated. As described above, since the estimation is performed using the scattering of the oil, the position of the boundary can be estimated even under the situation where the oils are scattered. The pulley thrust can be appropriately adjusted based on the estimated boundary position.

If the detection means is disposed in a space where the opening width of the V-groove extends from the rotation center of the target pulley toward the outer side in the radial direction of the target pulley and where the V belt does not reach, It is possible to reliably detect the scattering state of the oil in the pulley radial direction outside without interference.
In addition, if a plurality of detection means are provided side by side in the rotation direction of the V-belt and the boundary position is estimated from the oil scattering state detected by the plurality of detection means, it is possible to accurately estimate even if the boundary position changes greatly. Can do.

  In addition, if the detecting means is arranged at the outer periphery of the position of the connecting portion of the element where the holding belt is not present in the central portion in the element width direction, the oil is surely scattered without being disturbed by the holding belt. Can be detected.

  Protrusions formed on one surface of the central portion of the element head in the element width direction are provided on both sides of the central portion except for the central portion in the element width direction, and the detection means is located at the central portion in the element width direction. If it is arranged on the outer periphery of the position where the protrusion does not exist, it is possible to reliably detect the oil scattering state without being obstructed by the protrusion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the pulley thrust adjustment apparatus concerning one Embodiment of this invention, and is the figure which added the control apparatus to the typical side view of the principal part of V belt type continuously variable transmission. It is a perspective view which shows the element of the V belt concerning one Embodiment of this invention. It is a partial side view which shows the V belt concerning one Embodiment of this invention. It is an end view which shows the arrangement | sequence state of the element of V belt concerning one Embodiment of this invention. It is a figure explaining the determination method of the detection result of the oil scattering detection sensor (detection means) concerning one Embodiment of this invention. It is a figure which shows an example of the map used for estimation of the arc position concerning one Embodiment of this invention. It is a flowchart explaining the pulley thrust adjustment method concerning one Embodiment of this invention. It is a typical side view of the principal part of the V belt type continuously variable transmission explaining the pulley thrust adjustment method concerning the background art of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 7 illustrate a V-belt type continuously variable transmission and a pulley thrust force adjusting device according to the present embodiment, which will be described with reference to these drawings. The continuously variable transmission is connected to an automobile engine (prime mover).

  As shown in FIG. 1, a V-belt type continuously variable transmission (V-belt type CVT) 1 includes a primary shaft (input shaft) 2A, a secondary shaft (output shaft) 3A arranged in parallel with the primary shaft 2A, a primary shaft A primary pulley (drive pulley, input-side variable pulley) 2 supported by the shaft 2A, a secondary pulley (driven pulley, output-side variable pulley) 3 supported by the secondary shaft 3A, and these pulleys 2 and 3 are wound around V belt (power transmission endless belt) 4.

  The primary shaft 2A is connected to an engine (not shown) via a torque converter (not shown), and the secondary shaft 3A is connected to drive wheels (not shown) via a reduction gear, a differential gear device, etc. (not shown).

  The primary pulley 2 includes a fixed pulley fixed to the primary shaft 2A, and a movable pulley that faces the fixed pulley, is locked in the rotational direction with respect to the primary shaft 2A, and is movable in the axial direction. ing. The opposing surfaces of the fixed pulley and the movable pulley are formed in a conical shape in which the distance between the two gradually increases toward the radially outer side (outer peripheral edge side), and a V-shaped cross section is formed. The movable pulley has its axial position controlled by a hydraulic actuator (hydraulic mechanism) 30.

  Similarly, the secondary pulley 3 is a fixed pulley fixed to the secondary shaft 3A, and a movable pulley that faces the fixed pulley, is locked in the rotational direction with respect to the secondary shaft 3A, and is movable in the axial direction. And. Further, the opposing surfaces of the fixed pulley and the movable pulley are formed in a conical shape in which the distance between the two gradually increases toward the radially outer side (outer peripheral edge side), and a V-shaped cross section is formed. The movable pulley is controlled in the axial position by following the movable pulley of the primary pulley 2 by a hydraulic actuator (hydraulic mechanism) 30.

  The V-belt 4 includes a large number of elements 5 arranged in series and a metal ring (holding belt) 6 that holds these elements 5, and the V-belt type CVT 1 is a push type. . As the outer surfaces (left and right end surfaces) at both ends of each element 5 are directed radially outward (outer peripheral edge side), the distance between both elements gradually increases and the cross-section is formed in a V-shape. Slid in contact.

  As shown in FIG. 2, the element 5 is arranged at the head portion 51 located on the outer peripheral side of the V-belt 4, the body portion 52 located on the inner peripheral side of the V-belt 4, and the center portion in the width direction of the element 5. A constricted connecting portion 53 for connecting the head portion 51 and the body portion 52, and a slot 54a formed between the head portion 51 and the body portion 52 on one side and the other side of the constricted connecting portion 53, respectively. , 54b. An outer surface having a V-shaped cross section is formed at both ends of the body portion 52. The element 5 is formed by punching a metal plate into a predetermined shape and heat-treating it.

  The metal ring 6 is formed by superposing thin metal rings in multiple layers, and bends according to the radii of the pulleys 2 and 3. The metal ring 6 is inserted into the slots 54a and 54b of the element 5, respectively, and the two metal rings 6a and 6b are provided separately from each other.

  As shown in FIGS. 2 to 4, the element 5 has an alignment protrusion 55 formed on one surface of the head portion 51, and an alignment groove portion on the other surface of the head portion 51. 56 is formed. The protrusions 55 of the elements 5 connected by the metal ring 6 are fitted into the groove portions 56 of the adjacent elements 5 so that the adjacent elements 5 are held in an appropriate positional relationship.

  And it is necessary to supply lubricating oil to the sliding contact part between each pulley 2 and 3 and V belt 4, ATF (Automatic Transmission Fluid) is used as lubricating oil from the shaft part of each pulley 2 and 3 The pulleys 2 and 3 are supplied between the pulleys 2 and 3 and the V-belt 4 along the surface of the V-grooves of the pulleys 2 and 3.

  The pulley thrust adjusting device according to the present embodiment is applied to such a push-type V-belt type CVT 1, and the target pulley (here, the primary pulley 2 is an object to be adjusted) of the primary pulley 2 and the secondary pulley 3. The oil (the above-mentioned lubricating ATF) is scattered from the gap between the elements 5 of the V-belt 4 disposed on the outer periphery of the pulley (primary pulley) 2. A plurality of oil scattering detection sensors (detection means) 10 for detection (indicated by reference numerals 10a to 10i when each sensor is distinguished) is provided.

  For example, a pressure sensor that receives the scattering of oil as pressure can be applied to the oil scattering detection sensor 10, but any sensor that reacts when receiving the scattered oil can be applied. By applying a pressure sensor, you can obtain output values that correlate not only with the presence or absence of oil splash, but also with the speed and amount of oil splash, so you can obtain more detailed information about the state of the oil splash. Can do. Here, the plurality of oil scattering detection sensors 10 a to 10 i are arranged in the circumferential direction on the outer peripheral portion of the primary pulley 2, specifically, from the rotation center of the primary pulley 2 toward the radially outer side of the primary pulley 2. 2 in the space where the opening width of the V-groove is extended and where the V-belt 4 does not reach even when the transmission gear ratio becomes the minimum transmission gear ratio (highest). .

  Further, the pulley thrust adjusting device is equipped with an electronic control unit [ECU, Engine (electric) Control Unit] 20 as a control means. The ECU 20 is an LSI device in which a microprocessor, ROM, RAM, and the like are integrated. The ECU 20 determines the boundary position between the active arc region in which the elements 5 are arranged without a gap and the idle arc region in which the elements 5 are arranged with a gap from the oil scattering state detected by the oil scattering detection sensor 10. As functional elements, an estimated boundary position estimation unit (boundary position estimation unit) 21 and a thrust adjustment unit (thrust adjustment unit) 22 that adjusts pulley thrust based on the boundary position estimated by the boundary position estimation unit 21 are used. I have.

  The boundary position estimation unit 21 estimates the boundary position (arc boundary position) between the active arc region and the idle arc region based on the oil scattering detection information of the plurality of oil scattering detection sensors 10a to 10i.

  That is, in the idle arc region, a gap is generated between the adjacent elements 5, so oil (ATF) supplied between the primary pulley 2 and the V belt 4 through the surface of the V groove from the shaft portion of the primary pulley 2. However, it scatters in the outer circumferential direction by centrifugal force from this gap. On the other hand, in the active arc region, there is almost no gap between adjacent elements 5 (which is very small compared to the gap in the idle arc region), so that the primary pulley 2 and the primary pulley 2 travel along the surface of the V groove from the shaft portion of the primary pulley 2. The oil (ATF) supplied to the V-belt 4 is blocked by the elements 5 that are in contact with each other, and the amount of oil scattered in the outer circumferential direction by centrifugal force is smaller than that in the idle arc region.

  As shown in FIG. 4, the oil splatter detection sensor 10 is arranged at a position where the metal rings 6 a and 6 b at the center in the width direction of the element 5 do not exist, that is, at the outer periphery of the position of the connecting portion 53 of the element 5. ing. The oil splatter detection sensor 10 is arranged at the center in the width direction of the element 5 when the oil splatter detection sensor 10 is shifted from the center in the width direction of the element 5 to the side. This is to prevent the oil from being scattered by the metal belts 6a and 6b even if this occurs, and even if it is in the idle arc region, it may be mistaken for the active arc region. The oil scattering detection sensor 10 is disposed close to the V belt 4 as long as the V belt 4 does not interfere even when the V belt 4 rotates with the largest diameter.

  As shown in FIGS. 2 and 4, the projecting portion 55 of the element 5 is divided and projected on both sides of the center portion except for the center portion in the width direction of the element 5. A recess 55c is formed at the center in the width direction of the element 5 between the portions 55a and 55b. As shown in FIG. 3, even if the primary pulley 2 is in a state where the elements 5 are pressed against each other, as shown in FIG. 4, the protrusions 55 and the grooves 56 on the outer side of the metal ring 6 are adjacent in the radial position. There is a gap between the element 5 and the center part in the width direction of the element 5, but there is no protrusion 55 a, 55 b at the center of the width direction of the element 5, and a recess 55 c is formed. It has become. The oil that scatters in the outer peripheral direction from the gap formed between the adjacent elements 5 reaches the oil scatter detection sensor 10 through this space without any problem.

  For example, as indicated by arrows in FIG. 1, the oil scatters in the outer circumferential direction from between the elements 5 in the idle arc region, and there is no such scatter in the active arc region. As a result, for the oil scattered from the idle arc region, the amount of oil scattering detection sensors 10a to 10e on the upstream side in the rotational direction detects an amount exceeding a preset reference value, and the oil scattering detection sensor 10f on the downstream side in the rotational direction is detected. At 10 g, only an amount below the reference value is detected. The boundary position estimator 21 first determines a boundary sensor (detection boundary) that detects the scattering of the oil exceeding the reference value. In this case, it is determined that the oil scattering detection sensor 10e or between the sensor 10e and the sensor 10f is a detection boundary. FIG. 5 illustrates this determination. In FIG. 5, 1 to 7 on the horizontal axis correspond to the oil scattering detection sensors 10a to 10g, and the numbers with circles indicate the sensors that detect the scattering.

  By the way, the scattering direction of the oil from the arc of the primary pulley 2 is directed forward in the rotational direction in the circumferential direction with respect to the position where the oil is separated from the element 5 and reaches one of the oil scattering detection sensors 10a to 10i. At this time, the oil scattering detection sensors 10a to 10i to which the scattered oil reaches correlate with the position where the oil is separated from the element 5, and the position where the oil is separated from the element 5 is the rotational speed (rotation speed, here Then, it correlates with the primary shaft rotation speed Np). Further, the position at which the oil is separated from the element 5 varies depending on the effective radius of the primary pulley 2. Further, when the oil viscosity η is high, the timing at which the oil is separated from the element 5 is delayed. Therefore, the oil scattering state also changes depending on the oil viscosity η.

  Therefore, in the boundary position estimation unit 21, the detection boundary and arc boundary position corresponding to the oil viscosity η, the effective radius (pulley radius) R of the primary pulley 2, and the rotation speed (pulley rotation speed) Np of the primary pulley 2 are previously determined. When the detection boundary is determined, the oil viscosity η, the pulley radius R, and the pulley rotation speed Np at this time are acquired, and the arc boundary position is estimated from the detection boundary using the map. It is like that.

For example, FIG. 6 is an example of a map that defines the relationship between the detection boundary and the arc boundary position according to the oil viscosity η, the pulley radius R, and the pulley rotation speed Np. In this example, as shown in the figure, the arc boundary position θ corresponding to the oil viscosity η, the pulley radius R, and the pulley rotation speed Np is associated with each detection boundary, and θ ₀ is a reference arc boundary position (for example, , The position on the plane connecting the primary shaft 2A and the secondary shaft 3A), + indicates the upstream side in the rotational direction, and-indicates the downstream side in the rotational direction.

  As shown in FIG. 6, the arc boundary position shifts to the downstream side in the rotational direction as the pulley rotational speed Np increases. Further, the larger the pulley radius R (the radius around which the V-belt 4 is wound around the primary pulley 2), the more the arc boundary position is shifted to the downstream side in the rotational direction. Furthermore, although not illustrated, the arc boundary position shifts to the upstream side in the rotation direction as the oil viscosity η increases.

  The oil viscosity η can be obtained from, for example, the type of oil and the temperature of oil detected by an oil temperature sensor (not shown), and the pulley radius R is obtained from, for example, the axial position or the gear ratio of the movable pulley of the primary pulley 2. The pulley rotation speed Np can be obtained by, for example, a primary shaft rotation speed sensor attached to the primary shaft 2A.

The thrust adjustment unit 22 sets a target arc boundary position θ _t based on the gear ratio and the pulley rotation speed Np, and the arc boundary position θ estimated by the boundary position estimation unit 21 becomes the target arc boundary position θ _t . The line pressure of the hydraulic actuator 30 of the primary pulley 2 is controlled so as to approach.

In other words, the thrust adjustment unit 22, if the downstream side of the estimated arc boundary position theta is the target arc boundary position theta _t, smaller than the size of the active arcs region the target, the pulley thrust is too high (i.e., the line pressure In this case, the estimated arc boundary position θ is moved to the upstream side by reducing the line pressure by a predetermined amount (unit amount) to lower the line pressure and lowering the pulley thrust. Extend the arc area.

Further, the thrust adjustment unit 22, if upstream of the estimated arc boundary position theta is the target arc boundary position theta _t, larger than the size of the active arcs region the target, the pulley thrust is too low (line pressure is too low In this case, the line pressure is increased by a predetermined amount (unit amount) to raise the line pressure and raise the pulley thrust, thereby moving the estimated arc boundary position θ to the downstream side and the active arc region. Reduce.

  Since the pulley thrust adjusting device for a V-belt type continuously variable transmission according to an embodiment of the present invention is configured as described above, during operation of the V-belt type continuously variable transmission 1, for example, FIG. As shown, the pulley thrust can be adjusted.

  That is, as shown in FIG. 7, the oil viscosity η, the pulley radius R, and the pulley rotation speed Np are acquired (step S10), and then the detection values of the oil scattering detection sensors 10a to 10i are acquired (step S20). ). Then, the oil scattering detection sensor 10 that detects the amount exceeding the reference value of the oil scattered from the idle arc region is determined as the detection boundary (step S30).

Then, the arc boundary position θ is estimated from the oil viscosity η, the pulley radius R, the pulley rotation speed Np, and the detection boundary, for example, using a map as shown in FIG. 6 (step S40). At the same time, the target arc boundary position θ _t is set based on the gear ratio and the pulley rotation speed Np (step S50), and the primary arc boundary position θ is brought close to the target arc boundary position θ _t. The line pressure of the hydraulic actuator 30 of the pulley 2 is controlled (step S60).

In this way, according to the present apparatus and method, the oil boundary is used to estimate the arc boundary position between the active arc region and the idle arc region. It can be estimated accurately. The pulley thrust can be appropriately adjusted based on the estimated boundary position.
In addition, a plurality of oil splatter detection sensors 10 are provided side by side in the moving direction of the V-belt 4, and the boundary position is estimated from the oil splattered state detected by the plurality of sensors 10a to 10i. Can be estimated with high accuracy.

  Further, since the oil splatter detection sensor 10 is arranged at the outer periphery of the position of the connecting portion 53 of the element 5 where the metal ring 6 does not exist in the center portion in the width direction of the element 5, the oil splatters outward. The state can be reliably detected without being obstructed by the metal ring 6. Further, the oil scattering detection sensor 10 is a space in which the opening width of the V groove of the primary pulley 2 extends from the rotation center of the primary pulley 2 to the radially outer side of the primary pulley 2, and the speed ratio is the minimum speed ratio. Since the V-belt 4 is disposed in a space that does not reach even when it is (highest), it is possible to reliably detect the state of oil scattering outward in the pulley radial direction without interfering with the V-belt 4.

  Furthermore, protrusions 55a and 55b formed on one surface of the central portion in the width direction of the element 5 of the head portion 51 of the element 5 are provided on both sides of the central portion except for the central portion in the width direction of the element 5, Since the oil scattering detection sensor 10 is disposed on the outer periphery of the position of the recess 55c where the protrusions 55a and 55b at the center in the width direction of the element 5 are not present, the state of oil scattering outward is indicated by the protrusion 55a. , 55b can be reliably detected.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, In the range which does not deviate from the meaning of this invention, the said embodiment can be changed suitably and can be implemented.

  For example, in the above embodiment, a plurality of oil scattering detection sensors 10 are provided, but only one oil scattering detection sensor is provided at an appropriate position, and depending on whether the oil scattering detection sensor 10 detects oil scattering, That is, it is possible to simply adjust the pulley thrust depending on whether the arc boundary position is upstream or downstream in the rotational direction from the predetermined position.

  Even if there is only one oil scattering detection sensor, if the oil scattering detection sensor can detect the amount of scattering or the strength of scattering like a pressure sensor, the amount of scattering or the strength of scattering is taken into account, The arc boundary position can also be estimated.

  In the above embodiment, the V-belt type continuously variable transmission is connected to the engine of the automobile. However, the present invention is not limited to the automobile, and the V-belt type continuously variable transmission provided in various things. It can be applied to the machine.

1 V belt type continuously variable transmission (V belt type CVT)
2 Primary pulley (drive pulley, input variable pulley)
2A Primary shaft (input shaft)
3 Secondary pulley (driven pulley, variable pulley on the output side)
3A Secondary shaft (output shaft)
4 V belt (endless belt for power transmission)
5 Element 51 Head portion 52 Body portion 53 Connecting portion 54a, 54b Slot 55 Protruding portion 55a, 55b Protruding portion main body 55c Depression portion 56 Groove portion 6, 6a, 6b Metal ring (holding belt)
10, 10a-10i Oil scattering detection sensor (detection means)
20 Electronic control unit [ECU, Engine (electric) Control Unit] as control means
21 Boundary position estimation unit (boundary position estimation means)
22 Thrust adjuster (Thrust adjuster)
30 Hydraulic actuator (hydraulic mechanism)

Claims (6)

A primary pulley, a secondary pulley, and a V-belt that spans the two pulleys. The V-belt includes a plurality of elements arranged in series and a holding belt that holds the elements. A pulley thrust adjusting device for a V-belt type continuously variable transmission for adjusting a pulley thrust of a target pulley of the primary pulley and the secondary pulley in a step transmission,
Detecting means that is disposed on an outer peripheral portion of the target pulley and detects an oil scattering state from a gap between the elements of the V-belt held in a V-groove of the target pulley;
An active arc region in which the gap between the elements is arranged in a small state from the oil scattering state detected by the detection means, and an idle arc region in which the gap between the elements is arranged in a state larger than the gap in the active arc region Boundary position estimating means for estimating the boundary position between and
A pulley thrust adjustment device for a V-belt type continuously variable transmission, comprising: a thrust adjustment unit that adjusts the pulley thrust based on the boundary position estimated by the boundary position estimation unit. The detection means is disposed in a space in which the opening width of the V-groove extends from the rotation center of the target pulley toward the outer side in the radial direction of the target pulley and the V belt does not reach. The pulley thrust force adjusting device for a V-belt type continuously variable transmission according to claim 1, wherein A plurality of the detection means are provided along the rotation direction of the rotating V belt,
The pulley of the V-belt type continuously variable transmission according to claim 1 or 2, wherein the boundary position estimation means estimates the boundary position from oil scattering states detected by a plurality of detection means. Thrust adjustment device. When the element is provided as a part of the V-belt, the head is disposed at the outer periphery of the V-belt, the body positioned at the inner periphery, and the center in the element width direction. A connecting portion that connects a portion and the body portion, and slots formed between the head portion and the body portion on one side and the other side of the connecting portion,
The holding belt is provided in each of the slots on the one side and the other side,
The said detection means is arrange | positioned in the outer periphery of the position of the said connection part of the said element in which the said holding belt of the center part of the said element width direction does not exist, The any one of Claims 1-3 characterized by the above-mentioned. A pulley thrust adjusting device for a V-belt continuously variable transmission according to claim 1. In the central portion of the head portion in the element width direction, a protrusion is formed on one surface and a groove on which the protrusion can enter is formed on the other surface.
The protrusions are provided on both sides of the center part except for the center part in the element width direction,
5. The pulley thrust adjustment of a V-belt type continuously variable transmission according to claim 4, wherein the detection means is disposed on an outer periphery of a position where the protrusion of the central portion in the element width direction does not exist. apparatus. A primary pulley, a secondary pulley, and a V-belt that spans the two pulleys. The V-belt includes a number of elements arranged in series and a holding belt that holds the elements. A pulley thrust adjustment method for a V-belt continuously variable transmission for adjusting a pulley thrust of a target pulley of the primary pulley and the secondary pulley in a step transmission,
A detecting step of detecting an oil scattering state from a gap between the elements of the V-belt, which is disposed on an outer peripheral portion of the target pulley and is held by the target pulley;
An active arc region in which the gap between the elements is arranged in a small state from the oil scattering state detected in the detection step, and an idle arc region in which the gap between the elements is arranged in a state larger than the active arc region. A boundary position estimation step for estimating the boundary position;
A pulley thrust adjustment method for a V-belt type continuously variable transmission, comprising: a thrust adjustment step for adjusting the pulley thrust based on the boundary position estimated in the boundary position estimation step.

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